1: # The LearningOnline Network with CAPA
2: # .helper XML handler to implement the LON-CAPA helper
3: #
4: # $Id: lonhelper.pm,v 1.166.2.2 2008/12/21 16:24:49 raeburn Exp $
5: #
6: # Copyright Michigan State University Board of Trustees
7: #
8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
9: #
10: # LON-CAPA is free software; you can redistribute it and/or modify
11: # it under the terms of the GNU General Public License as published by
12: # the Free Software Foundation; either version 2 of the License, or
13: # (at your option) any later version.
14: #
15: # LON-CAPA is distributed in the hope that it will be useful,
16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18: # GNU General Public License for more details.
19: #
20: # You should have received a copy of the GNU General Public License
21: # along with LON-CAPA; if not, write to the Free Software
22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23: #
24: # /home/httpd/html/adm/gpl.txt
25: #
26: # http://www.lon-capa.org/
27: #
28:
29: =pod
30:
31: =head1 NAME
32:
33: lonhelper - implements helper framework
34:
35: =head1 SYNOPSIS
36:
37: lonhelper implements the helper framework for LON-CAPA, and provides
38: many generally useful components for that framework.
39:
40: Helpers are little programs which present the user with a sequence of
41: simple choices, instead of one monolithic multi-dimensional
42: choice. They are also referred to as "wizards", "druids", and
43: other potentially trademarked or semantically-loaded words.
44:
45: =head1 OVERVIEWX<lonhelper>
46:
47: Helpers are well-established UI widgets that users
48: feel comfortable with. It can take a complicated multidimensional problem the
49: user has and turn it into a series of bite-sized one-dimensional questions.
50:
51: For developers, helpers provide an easy way to bundle little bits of functionality
52: for the user, without having to write the tedious state-maintenence code.
53:
54: Helpers are defined as XML documents, placed in the /home/httpd/html/adm/helpers
55: directory and having the .helper file extension. For examples, see that directory.
56:
57: All classes are in the Apache::lonhelper namespace.
58:
59: =head1 lonhelper XML file formatX<lonhelper, XML file format>
60:
61: A helper consists of a top-level <helper> tag which contains a series of states.
62: Each state contains one or more state elements, which are what the user sees, like
63: messages, resource selections, or date queries.
64:
65: The helper tag is required to have one attribute, "title", which is the name
66: of the helper itself, such as "Parameter helper". The helper tag may optionally
67: have a "requiredpriv" attribute, specifying the priviledge a user must have
68: to use the helper, or get denied access. See loncom/auth/rolesplain.tab for
69: useful privs. Default is full access, which is often wrong!
70:
71: =head2 State tags
72:
73: State tags are required to have an attribute "name", which is the symbolic
74: name of the state and will not be directly seen by the user. The helper is
75: required to have one state named "START", which is the state the helper
76: will start with. By convention, this state should clearly describe what
77: the helper will do for the user, and may also include the first information
78: entry the user needs to do for the helper.
79:
80: State tags are also required to have an attribute "title", which is the
81: human name of the state, and will be displayed as the header on top of
82: the screen for the user.
83:
84: State tags may also optionally have an attribute "help" which should be
85: the filename of a help file, this will add a blue ? to the title.
86:
87: =head2 Example Helper Skeleton
88:
89: An example of the tags so far:
90:
91: <helper title="Example Helper">
92: <state name="START" title="Demonstrating the Example Helper">
93: <!-- notice this is the START state the helper requires -->
94: </state>
95: <state name="GET_NAME" title="Enter Student Name">
96: </state>
97: </helper>
98:
99: Of course this does nothing. In order for the helper to do something, it is
100: necessary to put actual elements into the helper. Documentation for each
101: of these elements follows.
102:
103: =head1 Creating a Helper With Code, Not XML
104:
105: In some situations, such as the printing helper (see lonprintout.pm),
106: writing the helper in XML would be too complicated, because of scope
107: issues or the fact that the code actually outweighs the XML. It is
108: possible to create a helper via code, though it is a little odd.
109:
110: Creating a helper via code is more like issuing commands to create
111: a helper then normal code writing. For instance, elements will automatically
112: be added to the last state created, so it's important to create the
113: states in the correct order.
114:
115: First, create a new helper:
116:
117: use Apache::lonhelper;
118:
119: my $helper = Apache::lonhelper::new->("Helper Title");
120:
121: Next you'll need to manually add states to the helper:
122:
123: Apache::lonhelper::state->new("STATE_NAME", "State's Human Title");
124:
125: You don't need to save a reference to it because all elements up until
126: the next state creation will automatically be added to this state.
127:
128: Elements are created by populating the $paramHash in
129: Apache::lonhelper::paramhash. To prevent namespace issues, retrieve
130: a reference to that has with getParamHash:
131:
132: my $paramHash = Apache::lonhelper::getParamHash();
133:
134: You will need to do this for each state you create.
135:
136: Populate the $paramHash with the parameters for the element you wish
137: to add next; the easiest way to find out what those entries are is
138: to read the code. Some common ones are 'variable' to record the variable
139: to store the results in, and NEXTSTATE to record a next state transition.
140:
141: Then create your element:
142:
143: $paramHash->{MESSAGETEXT} = "This is a message.";
144: Apache::lonhelper::message->new();
145:
146: The creation will take the $paramHash and bless it into a
147: Apache::lonhelper::message object. To create the next element, you need
148: to get a reference to the new, empty $paramHash:
149:
150: $paramHash = Apache::lonhelper::getParamHash();
151:
152: and you can repeat creating elements that way. You can add states
153: and elements as needed.
154:
155: See lonprintout.pm, subroutine printHelper for an example of this, where
156: we dynamically add some states to prevent security problems, for instance.
157:
158: Normally the machinery in the XML format is sufficient; dynamically
159: adding states can easily be done by wrapping the state in a <condition>
160: tag. This should only be used when the code dominates the XML content,
161: the code is so complicated that it is difficult to get access to
162: all of the information you need because of scoping issues, or would-be <exec> or
163: <eval> blocks using the {DATA} mechanism results in hard-to-read
164: and -maintain code. (See course.initialization.helper for a borderline
165: case.)
166:
167: It is possible to do some of the work with an XML fragment parsed by
168: lonxml; again, see lonprintout.pm for an example. In that case it is
169: imperative that you call B<Apache::lonhelper::registerHelperTags()>
170: before parsing XML fragments and B<Apache::lonhelper::unregisterHelperTags()>
171: when you are done. See lonprintout.pm for examples of this usage in the
172: printHelper subroutine.
173:
174: =head2 Localization
175:
176: The helper framework tries to handle as much localization as
177: possible. The text is always run through
178: Apache::lonlocal::normalize_string, so be sure to run the keys through
179: that function for maximum usefulness and robustness.
180:
181: =cut
182:
183: package Apache::lonhelper;
184: use Apache::Constants qw(:common);
185: use Apache::File;
186: use Apache::lonxml;
187: use Apache::lonlocal;
188: use Apache::lonnet;
189: use Apache::longroup;
190: use Apache::lonselstudent;
191: use LONCAPA;
192:
193: # Register all the tags with the helper, so the helper can
194: # push and pop them
195:
196: my @helperTags;
197:
198: sub register {
199: my ($namespace, @tags) = @_;
200:
201: for my $tag (@tags) {
202: push @helperTags, [$namespace, $tag];
203: }
204: }
205:
206: BEGIN {
207: Apache::lonxml::register('Apache::lonhelper',
208: ('helper'));
209: register('Apache::lonhelper', ('state'));
210: }
211:
212: # Since all helpers are only three levels deep (helper tag, state tag,
213: # substate type), it's easier and more readble to explicitly track
214: # those three things directly, rather then futz with the tag stack
215: # every time.
216: my $helper;
217: my $state;
218: my $substate;
219: # To collect parameters, the contents of the subtags are collected
220: # into this paramHash, then passed to the element object when the
221: # end of the element tag is located.
222: my $paramHash;
223:
224: # Note from Jeremy 5-8-2003: It is *vital* that the real handler be called
225: # as a subroutine from the handler, or very mysterious things might happen.
226: # I don't know exactly why, but it seems that the scope where the Apache
227: # server enters the perl handler is treated differently from the rest of
228: # the handler. This also seems to manifest itself in the debugger as entering
229: # the perl handler in seemingly random places (sometimes it starts in the
230: # compiling phase, sometimes in the handler execution phase where it runs
231: # the code and stepping into the "1;" the module ends with goes into the handler,
232: # sometimes starting directly with the handler); I think the cause is related.
233: # In the debugger, this means that breakpoints are ignored until you step into
234: # a function and get out of what must be a "faked up scope" in the Apache->
235: # mod_perl connection. In this code, it was manifesting itself in the existence
236: # of two separate file-scoped $helper variables, one set to the value of the
237: # helper in the helper constructor, and one referenced by the handler on the
238: # "$helper->process()" line. Using the debugger, one could actually
239: # see the two different $helper variables, as hashes at completely
240: # different addresses. The second was therefore never set, and was still
241: # undefined when I tried to call process on it.
242: # By pushing the "real handler" down into the "real scope", everybody except the
243: # actual handler function directly below this comment gets the same $helper and
244: # everybody is happy.
245: # The upshot of all of this is that for safety when a handler is using
246: # file-scoped variables in LON-CAPA, the handler should be pushed down one
247: # call level, as I do here, to ensure that the top-level handler function does
248: # not get a different file scope from the rest of the code.
249: sub handler {
250: my $r = shift;
251: return real_handler($r);
252: }
253:
254: # For debugging purposes, one can send a second parameter into this
255: # function, the 'uri' of the helper you wish to have rendered, and
256: # call this from other handlers.
257: sub real_handler {
258: my $r = shift;
259: my $uri = shift;
260: if (!defined($uri)) { $uri = $r->uri(); }
261: $env{'request.uri'} = $uri;
262: my $filename = '/home/httpd/html' . $uri;
263: my $fh = Apache::File->new($filename);
264: my $file;
265: read $fh, $file, 100000000;
266:
267:
268: # Send header, don't cache this page
269: if ($env{'browser.mathml'}) {
270: &Apache::loncommon::content_type($r,'text/xml');
271: } else {
272: &Apache::loncommon::content_type($r,'text/html');
273: }
274: $r->send_http_header;
275: return OK if $r->header_only;
276: $r->rflush();
277:
278: # Discard result, we just want the objects that get created by the
279: # xml parsing
280: &Apache::lonxml::xmlparse($r, 'helper', $file);
281:
282: my $allowed = $helper->allowedCheck();
283: if (!$allowed) {
284: $env{'user.error.msg'} = $env{'request.uri'}.':'.$helper->{REQUIRED_PRIV}.
285: ":0:0:Permission denied to access this helper.";
286: return HTTP_NOT_ACCEPTABLE;
287: }
288:
289: $helper->process();
290:
291: $r->print($helper->display());
292: return OK;
293: }
294:
295: sub registerHelperTags {
296: for my $tagList (@helperTags) {
297: Apache::lonxml::register($tagList->[0], $tagList->[1]);
298: }
299: }
300:
301: sub unregisterHelperTags {
302: for my $tagList (@helperTags) {
303: Apache::lonxml::deregister($tagList->[0], $tagList->[1]);
304: }
305: }
306:
307: sub start_helper {
308: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
309:
310: if ($target ne 'helper') {
311: return '';
312: }
313:
314: registerHelperTags();
315:
316: Apache::lonhelper::helper->new($token->[2]{'title'}, $token->[2]{'requiredpriv'});
317: return '';
318: }
319:
320: sub end_helper {
321: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
322:
323: if ($target ne 'helper') {
324: return '';
325: }
326:
327: unregisterHelperTags();
328:
329: return '';
330: }
331:
332: sub start_state {
333: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
334:
335: if ($target ne 'helper') {
336: return '';
337: }
338:
339: Apache::lonhelper::state->new($token->[2]{'name'},
340: $token->[2]{'title'},
341: $token->[2]{'help'});
342: return '';
343: }
344:
345: # Use this to get the param hash from other files.
346: sub getParamHash {
347: return $paramHash;
348: }
349:
350: # Use this to get the helper, if implementing elements in other files
351: # (like lonprintout.pm)
352: sub getHelper {
353: return $helper;
354: }
355:
356: # don't need this, so ignore it
357: sub end_state {
358: return '';
359: }
360:
361: 1;
362:
363: package Apache::lonhelper::helper;
364:
365: use Digest::MD5 qw(md5_hex);
366: use HTML::Entities();
367: use Apache::loncommon;
368: use Apache::File;
369: use Apache::lonlocal;
370: use Apache::lonnet;
371: use LONCAPA;
372:
373: sub new {
374: my $proto = shift;
375: my $class = ref($proto) || $proto;
376: my $self = {};
377:
378: $self->{TITLE} = shift;
379: $self->{REQUIRED_PRIV} = shift;
380:
381: # If there is a state from the previous form, use that. If there is no
382: # state, use the start state parameter.
383: if (defined $env{"form.CURRENT_STATE"})
384: {
385: $self->{STATE} = $env{"form.CURRENT_STATE"};
386: }
387: else
388: {
389: $self->{STATE} = "START";
390: }
391:
392: $self->{TOKEN} = $env{'form.TOKEN'};
393: # If a token was passed, we load that in. Otherwise, we need to create a
394: # new storage file
395: # Tried to use standard Tie'd hashes, but you can't seem to take a
396: # reference to a tied hash and write to it. I'd call that a wart.
397: if ($self->{TOKEN}) {
398: # Validate the token before trusting it
399: if ($self->{TOKEN} !~ /^[a-f0-9]{32}$/) {
400: # Not legit. Return nothing and let all hell break loose.
401: # User shouldn't be doing that!
402: return undef;
403: }
404:
405: # Get the hash.
406: $self->{FILENAME} = $Apache::lonnet::tmpdir . md5_hex($self->{TOKEN}); # Note the token is not the literal file
407:
408: my $file = Apache::File->new($self->{FILENAME});
409: my $contents = <$file>;
410:
411: # Now load in the contents
412: for my $value (split (/&/, $contents)) {
413: my ($name, $value) = split(/=/, $value);
414: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
415: $self->{VARS}->{$name} = $value;
416: }
417:
418: $file->close();
419: } else {
420: # Only valid if we're just starting.
421: if ($self->{STATE} ne 'START') {
422: return undef;
423: }
424: # Must create the storage
425: $self->{TOKEN} = md5_hex($env{'user.name'} . $env{'user.domain'} .
426: time() . rand());
427: $self->{FILENAME} = $Apache::lonnet::tmpdir . md5_hex($self->{TOKEN});
428: }
429:
430: # OK, we now have our persistent storage.
431:
432: if (defined $env{"form.RETURN_PAGE"})
433: {
434: $self->{RETURN_PAGE} = $env{"form.RETURN_PAGE"};
435: }
436: else
437: {
438: $self->{RETURN_PAGE} = $ENV{REFERER};
439: }
440:
441: $self->{STATES} = {};
442: $self->{DONE} = 0;
443:
444: # Used by various helpers for various things; see lonparm.helper
445: # for an example.
446: $self->{DATA} = {};
447:
448: $helper = $self;
449:
450: # Establish the $paramHash
451: $paramHash = {};
452:
453: bless($self, $class);
454: return $self;
455: }
456:
457: # Private function; returns a string to construct the hidden fields
458: # necessary to have the helper track state.
459: sub _saveVars {
460: my $self = shift;
461: my $result = "";
462: $result .= '<input type="hidden" name="CURRENT_STATE" value="' .
463: HTML::Entities::encode($self->{STATE},'<>&"') . "\" />\n";
464: $result .= '<input type="hidden" name="TOKEN" value="' .
465: $self->{TOKEN} . "\" />\n";
466: $result .= '<input type="hidden" name="RETURN_PAGE" value="' .
467: HTML::Entities::encode($self->{RETURN_PAGE},'<>&"') . "\" />\n";
468:
469: return $result;
470: }
471:
472: # Private function: Create the querystring-like representation of the stored
473: # data to write to disk.
474: sub _varsInFile {
475: my $self = shift;
476: my @vars = ();
477: for my $key (keys(%{$self->{VARS}})) {
478: push(@vars, &escape($key) . '=' . &escape($self->{VARS}->{$key}));
479: }
480: return join ('&', @vars);
481: }
482:
483: # Use this to declare variables.
484: # FIXME: Document this
485: sub declareVar {
486: my $self = shift;
487: my $var = shift;
488:
489: if (!defined($self->{VARS}->{$var})) {
490: $self->{VARS}->{$var} = '';
491: }
492:
493: my $envname = 'form.' . $var . '_forminput';
494: if (defined($env{$envname})) {
495: if (ref($env{$envname})) {
496: $self->{VARS}->{$var} = join('|||', @{$env{$envname}});
497: } else {
498: $self->{VARS}->{$var} = $env{$envname};
499: }
500: }
501: }
502:
503: sub allowedCheck {
504: my $self = shift;
505:
506: if (!defined($self->{REQUIRED_PRIV})) {
507: return 1;
508: }
509:
510: return Apache::lonnet::allowed($self->{REQUIRED_PRIV}, $env{'request.course.id'});
511: }
512:
513: sub changeState {
514: my $self = shift;
515: $self->{STATE} = shift;
516: }
517:
518: sub registerState {
519: my $self = shift;
520: my $state = shift;
521:
522: my $stateName = $state->name();
523: $self->{STATES}{$stateName} = $state;
524: }
525:
526: sub process {
527: my $self = shift;
528:
529: # Phase 1: Post processing for state of previous screen (which is actually
530: # the "current state" in terms of the helper variables), if it wasn't the
531: # beginning state.
532: if ($self->{STATE} ne "START" || $env{"form.SUBMIT"} eq &mt("Next ->")) {
533: my $prevState = $self->{STATES}{$self->{STATE}};
534: $prevState->postprocess();
535: }
536:
537: # Note, to handle errors in a state's input that a user must correct,
538: # do not transition in the postprocess, and force the user to correct
539: # the error.
540:
541: # Phase 2: Preprocess current state
542: my $startState = $self->{STATE};
543: my $state = $self->{STATES}->{$startState};
544:
545: # For debugging, print something here to determine if you're going
546: # to an undefined state.
547: if (!defined($state)) {
548: return;
549: }
550: $state->preprocess();
551:
552: # Phase 3: While the current state is different from the previous state,
553: # keep processing.
554: while ( $startState ne $self->{STATE} &&
555: defined($self->{STATES}->{$self->{STATE}}) )
556: {
557: $startState = $self->{STATE};
558: $state = $self->{STATES}->{$startState};
559: $state->preprocess();
560: }
561:
562: return;
563: }
564:
565: # 1: Do the post processing for the previous state.
566: # 2: Do the preprocessing for the current state.
567: # 3: Check to see if state changed, if so, postprocess current and move to next.
568: # Repeat until state stays stable.
569: # 4: Render the current state to the screen as an HTML page.
570: sub display {
571: my $self = shift;
572:
573: my $state = $self->{STATES}{$self->{STATE}};
574:
575: my $result = "";
576:
577: if (!defined($state)) {
578: $result = "<font color='#ff0000'>Error: state '$state' not defined!</font>";
579: return $result;
580: }
581:
582: # Phase 4: Display.
583: my $stateTitle=&mt($state->title());
584: my $stateHelp= $state->help();
585: my $browser_searcher_js =
586: '<script type="text/javascript">'."\n".
587: &Apache::loncommon::browser_and_searcher_javascript().
588: "\n".'</script>';
589:
590: $result .= &Apache::loncommon::start_page($self->{TITLE},
591: $browser_searcher_js);
592:
593: my $previous = HTML::Entities::encode(&mt("<- Previous"), '<>&"');
594: my $next = HTML::Entities::encode(&mt("Next ->"), '<>&"');
595: # FIXME: This should be parameterized, not concatenated - Jeremy
596:
597:
598: if (!$state->overrideForm()) { $result.="<form name='helpform' method='POST'>"; }
599: if ($stateHelp) {
600: $stateHelp = &Apache::loncommon::help_open_topic($stateHelp);
601: }
602: $result .= <<HEADER;
603: <table border="0" width='100%'><tr><td>
604: <h2><i>$stateTitle</i>$stateHelp</h2>
605: HEADER
606:
607: $result .= "<table cellpadding='10' width='100%'><tr><td rowspan='2' valign='top'>";
608:
609: if (!$state->overrideForm()) {
610: $result .= $self->_saveVars();
611: }
612: $result .= $state->render();
613:
614: $result .= "</td><td valign='top' align='right'>";
615:
616: # Warning: Copy and pasted from below, because it's too much trouble to
617: # turn this into a subroutine
618: if (!$state->overrideForm()) {
619: if ($self->{STATE} ne $self->{START_STATE}) {
620: #$result .= '<input name="SUBMIT" type="submit" value="<- Previous" /> ';
621: }
622: if ($self->{DONE}) {
623: my $returnPage = $self->{RETURN_PAGE};
624: $result .= "<a href=\"$returnPage\">" . &mt("End Helper") . "</a>";
625: }
626: else {
627: $result .= '<span class="LC_nobreak"><input name="back" type="button" ';
628: $result .= 'value="' . $previous . '" onclick="history.go(-1)" /> ';
629: $result .= '<input name="SUBMIT" type="submit" value="' . $next . '" /></span>';
630: }
631: }
632:
633: $result .= "</td></tr><tr><td valign='bottom' align='right'>";
634:
635: # Warning: Copy and pasted from above, because it's too much trouble to
636: # turn this into a subroutine
637: if (!$state->overrideForm()) {
638: if ($self->{STATE} ne $self->{START_STATE}) {
639: #$result .= '<input name="SUBMIT" type="submit" value="<- Previous" /> ';
640: }
641: if ($self->{DONE}) {
642: my $returnPage = $self->{RETURN_PAGE};
643: $result .= "<a href=\"$returnPage\">" . &mt('End Helper') . "</a>";
644: }
645: else {
646: $result .= '<span class="LC_nobreak"><input name="back" type="button" ';
647: $result .= 'value="' . $previous . '" onclick="history.go(-1)" /> ';
648: $result .= '<input name="SUBMIT" type="submit" value="' . $next . '" /></span>';
649: }
650: }
651:
652: #foreach my $key (keys %{$self->{VARS}}) {
653: # $result .= "|$key| -> " . $self->{VARS}->{$key} . "<br />";
654: #}
655:
656: $result .= "</td></tr></table>";
657:
658: $result .= <<FOOTER;
659: </td>
660: </tr>
661: </table>
662: </form>
663: FOOTER
664:
665: $result .= &Apache::loncommon::end_page();
666: # Handle writing out the vars to the file
667: my $file = Apache::File->new('>'.$self->{FILENAME});
668: print $file $self->_varsInFile();
669:
670: return $result;
671: }
672:
673: 1;
674:
675: package Apache::lonhelper::state;
676:
677: # States bundle things together and are responsible for compositing the
678: # various elements together. It is not generally necessary for users to
679: # use the state object directly, so it is not perldoc'ed.
680:
681: # Basically, all the states do is pass calls to the elements and aggregate
682: # the results.
683:
684: sub new {
685: my $proto = shift;
686: my $class = ref($proto) || $proto;
687: my $self = {};
688:
689: $self->{NAME} = shift;
690: $self->{TITLE} = shift;
691: $self->{HELP} = shift;
692: $self->{ELEMENTS} = [];
693:
694: bless($self, $class);
695:
696: $helper->registerState($self);
697:
698: $state = $self;
699:
700: return $self;
701: }
702:
703: sub name {
704: my $self = shift;
705: return $self->{NAME};
706: }
707:
708: sub title {
709: my $self = shift;
710: return $self->{TITLE};
711: }
712:
713: sub help {
714: my $self = shift;
715: return $self->{HELP};
716: }
717:
718: sub preprocess {
719: my $self = shift;
720: for my $element (@{$self->{ELEMENTS}}) {
721: $element->preprocess();
722: }
723: }
724:
725: # FIXME: Document that all postprocesses must return a true value or
726: # the state transition will be overridden
727: sub postprocess {
728: my $self = shift;
729:
730: # Save the state so we can roll it back if we need to.
731: my $originalState = $helper->{STATE};
732: my $everythingSuccessful = 1;
733:
734: for my $element (@{$self->{ELEMENTS}}) {
735: my $result = $element->postprocess();
736: if (!$result) { $everythingSuccessful = 0; }
737: }
738:
739: # If not all the postprocesses were successful, override
740: # any state transitions that may have occurred. It is the
741: # responsibility of the states to make sure they have
742: # error handling in that case.
743: if (!$everythingSuccessful) {
744: $helper->{STATE} = $originalState;
745: }
746: }
747:
748: # Override the form if any element wants to.
749: # two elements overriding the form will make a mess, but that should
750: # be considered helper author error ;-)
751: sub overrideForm {
752: my $self = shift;
753: for my $element (@{$self->{ELEMENTS}}) {
754: if ($element->overrideForm()) {
755: return 1;
756: }
757: }
758: return 0;
759: }
760:
761: sub addElement {
762: my $self = shift;
763: my $element = shift;
764:
765: push @{$self->{ELEMENTS}}, $element;
766: }
767:
768: sub render {
769: my $self = shift;
770: my @results = ();
771:
772: for my $element (@{$self->{ELEMENTS}}) {
773: push @results, $element->render();
774: }
775:
776: return join("\n", @results);
777: }
778:
779: 1;
780:
781: package Apache::lonhelper::element;
782: # Support code for elements
783:
784: =pod
785:
786: =head1 Element Base Class
787:
788: The Apache::lonhelper::element base class provides support for elements
789: and defines some generally useful tags for use in elements.
790:
791: =head2 finalcode tagX<finalcode>
792:
793: Each element can contain a "finalcode" tag that, when the special FINAL
794: helper state is used, will be executed, surrounded by "sub { my $helper = shift;"
795: and "}". It is expected to return a string describing what it did, which
796: may be an empty string. See course initialization helper for an example. This is
797: generally intended for helpers like the course initialization helper, which consist
798: of several panels, each of which is performing some sort of bite-sized functionality.
799:
800: =head2 defaultvalue tagX<defaultvalue>
801:
802: Each element that accepts user input can contain a "defaultvalue" tag that,
803: when surrounded by "sub { my $helper = shift; my $state = shift; " and "}",
804: will form a subroutine that when called will provide a default value for
805: the element. How this value is interpreted by the element is specific to
806: the element itself, and possibly the settings the element has (such as
807: multichoice vs. single choice for <choices> tags).
808:
809: This is also intended for things like the course initialization helper, where the
810: user is setting various parameters. By correctly grabbing current settings
811: and including them into the helper, it allows the user to come back to the
812: helper later and re-execute it, without needing to worry about overwriting
813: some setting accidentally.
814:
815: Again, see the course initialization helper for examples.
816:
817: =head2 validator tagX<validator>
818:
819: Some elements that accepts user input can contain a "validator" tag that,
820: when surrounded by "sub { my $helper = shift; my $state = shift; my $element = shift; my $val = shift "
821: and "}", where "$val" is the value the user entered, will form a subroutine
822: that when called will verify whether the given input is valid or not. If it
823: is valid, the routine will return a false value. If invalid, the routine
824: will return an error message to be displayed for the user.
825:
826: Consult the documentation for each element to see whether it supports this
827: tag.
828:
829: =head2 getValue methodX<getValue (helper elements)>
830:
831: If the element stores the name of the variable in a 'variable' member, which
832: the provided ones all do, you can retreive the value of the variable by calling
833: this method.
834:
835: =cut
836:
837: BEGIN {
838: &Apache::lonhelper::register('Apache::lonhelper::element',
839: ('nextstate', 'finalcode',
840: 'defaultvalue', 'validator'));
841: }
842:
843: # Because we use the param hash, this is often a sufficent
844: # constructor
845: sub new {
846: my $proto = shift;
847: my $class = ref($proto) || $proto;
848: my $self = $paramHash;
849: bless($self, $class);
850:
851: $self->{PARAMS} = $paramHash;
852: $self->{STATE} = $state;
853: $state->addElement($self);
854:
855: # Ensure param hash is not reused
856: $paramHash = {};
857:
858: return $self;
859: }
860:
861: sub start_nextstate {
862: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
863:
864: if ($target ne 'helper') {
865: return '';
866: }
867:
868: $paramHash->{NEXTSTATE} = &Apache::lonxml::get_all_text('/nextstate',
869: $parser);
870: return '';
871: }
872:
873: sub end_nextstate { return ''; }
874:
875: sub start_finalcode {
876: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
877:
878: if ($target ne 'helper') {
879: return '';
880: }
881:
882: $paramHash->{FINAL_CODE} = &Apache::lonxml::get_all_text('/finalcode',
883: $parser);
884: return '';
885: }
886:
887: sub end_finalcode { return ''; }
888:
889: sub start_defaultvalue {
890: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
891:
892: if ($target ne 'helper') {
893: return '';
894: }
895:
896: $paramHash->{DEFAULT_VALUE} = &Apache::lonxml::get_all_text('/defaultvalue',
897: $parser);
898: $paramHash->{DEFAULT_VALUE} = 'sub { my $helper = shift; my $state = shift;' .
899: $paramHash->{DEFAULT_VALUE} . '}';
900: return '';
901: }
902:
903: sub end_defaultvalue { return ''; }
904:
905: # Validators may need to take language specifications
906: sub start_validator {
907: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
908:
909: if ($target ne 'helper') {
910: return '';
911: }
912:
913: $paramHash->{VALIDATOR} = &Apache::lonxml::get_all_text('/validator',
914: $parser);
915: $paramHash->{VALIDATOR} = 'sub { my $helper = shift; my $state = shift; my $element = shift; my $val = shift;' .
916: $paramHash->{VALIDATOR} . '}';
917: return '';
918: }
919:
920: sub end_validator { return ''; }
921:
922: sub preprocess {
923: return 1;
924: }
925:
926: sub postprocess {
927: return 1;
928: }
929:
930: sub render {
931: return '';
932: }
933:
934: sub overrideForm {
935: return 0;
936: }
937:
938: sub getValue {
939: my $self = shift;
940: return $helper->{VARS}->{$self->{'variable'}};
941: }
942:
943: 1;
944:
945: package Apache::lonhelper::message;
946:
947: =pod
948:
949: =head1 Elements
950:
951: =head2 Element: messageX<message, helper element>
952:
953: Message elements display their contents, and
954: transition directly to the state in the <nextstate> attribute. Example:
955:
956: <message nextstate='GET_NAME'>
957: This is the <b>message</b> the user will see,
958: <i>HTML allowed</i>.
959: </message>
960:
961: This will display the HTML message and transition to the 'nextstate' if
962: given. The HTML will be directly inserted into the helper, so if you don't
963: want text to run together, you'll need to manually wrap the message text
964: in <p> tags, or whatever is appropriate for your HTML.
965:
966: Message tags do not add in whitespace, so if you want it, you'll need to add
967: it into states. This is done so you can inline some elements, such as
968: the <date> element, right between two messages, giving the appearence that
969: the <date> element appears inline. (Note the elements can not be embedded
970: within each other.)
971:
972: This is also a good template for creating your own new states, as it has
973: very little code beyond the state template.
974:
975: =head3 Localization
976:
977: The contents of the message tag will be run through the
978: normalize_string function and that will be used as a call to &mt.
979:
980: =cut
981:
982: no strict;
983: @ISA = ("Apache::lonhelper::element");
984: use strict;
985: use Apache::lonlocal;
986:
987: BEGIN {
988: &Apache::lonhelper::register('Apache::lonhelper::message',
989: ('message'));
990: }
991:
992: sub new {
993: my $ref = Apache::lonhelper::element->new();
994: bless($ref);
995: }
996:
997: # CONSTRUCTION: Construct the message element from the XML
998: sub start_message {
999: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1000:
1001: if ($target ne 'helper') {
1002: return '';
1003: }
1004:
1005: $paramHash->{MESSAGE_TEXT} = &mtn(&Apache::lonxml::get_all_text('/message',
1006: $parser));
1007:
1008: if (defined($token->[2]{'nextstate'})) {
1009: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
1010: }
1011: if (defined($token->[2]{'type'})) {
1012: $paramHash->{TYPE} = $token->[2]{'type'};
1013: }
1014: return '';
1015: }
1016:
1017: sub end_message {
1018: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1019:
1020: if ($target ne 'helper') {
1021: return '';
1022: }
1023: Apache::lonhelper::message->new();
1024: return '';
1025: }
1026:
1027: sub render {
1028: my $self = shift;
1029:
1030: if ($self->{TYPE} =~ /^\s*warning\s*$/i) {
1031: $self->{MESSAGE_TEXT} =
1032: '<span class="LC_warning">'. $self->{MESSAGE_TEXT}.'</span>';
1033: }
1034: if ($self->{TYPE} =~ /^\s*error\s*$/i) {
1035: $self->{MESSAGE_TEXT} =
1036: '<span class="LC_error">'. $self->{MESSAGE_TEXT}.'</span>';
1037: }
1038: return $self->{MESSAGE_TEXT};
1039: }
1040: # If a NEXTSTATE was given, switch to it
1041: sub postprocess {
1042: my $self = shift;
1043: if (defined($self->{NEXTSTATE})) {
1044: $helper->changeState($self->{NEXTSTATE});
1045: }
1046:
1047: return 1;
1048: }
1049: 1;
1050:
1051: package Apache::lonhelper::helpicon;
1052:
1053: =pod
1054:
1055: =head1 Elements
1056:
1057: =head2 Element: helpiconX<helpicon, helper element>
1058:
1059: Helpicon elements add a help icon at the current location.
1060: Example:
1061:
1062: <helpicon file="Help">
1063: General Help
1064: </helpicon>
1065:
1066: In this example will generate a help icon to the Help.hlp url with a
1067: description of 'General Help'. The description is not required and if
1068: left out (Example: <helpicon file="Help" /> only the icon will be
1069: added.)
1070:
1071: =head3 Localization
1072:
1073: The description text will be run through the normalize_string function
1074: and that will be used as a call to &mt.
1075:
1076: =cut
1077:
1078: no strict;
1079: @ISA = ("Apache::lonhelper::element");
1080: use strict;
1081: use Apache::lonlocal;
1082:
1083: BEGIN {
1084: &Apache::lonhelper::register('Apache::lonhelper::helpicon',
1085: ('helpicon'));
1086: }
1087:
1088: sub new {
1089: my $ref = Apache::lonhelper::element->new();
1090: bless($ref);
1091: }
1092:
1093: # CONSTRUCTION: Construct the message element from the XML
1094: sub start_helpicon {
1095: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1096:
1097: if ($target ne 'helper') {
1098: return '';
1099: }
1100:
1101: $paramHash->{HELP_TEXT} = &mtn(&Apache::lonxml::get_all_text('/helpicon',
1102: $parser));
1103:
1104: $paramHash->{HELP_TEXT} =~s/^\s+//;
1105: $paramHash->{HELP_TEXT} =~s/\s+$//;
1106:
1107: if (defined($token->[2]{'file'})) {
1108: $paramHash->{HELP_FILE} = $token->[2]{'file'};
1109: }
1110: return '';
1111: }
1112:
1113: sub end_helpicon {
1114: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1115:
1116: if ($target ne 'helper') {
1117: return '';
1118: }
1119: Apache::lonhelper::helpicon->new();
1120: return '';
1121: }
1122:
1123: sub render {
1124: my $self = shift;
1125:
1126: my $text;
1127: if ( $self->{HELP_TEXT} ne '') {
1128: $text=&mtn($self->{HELP_TEXT});
1129: }
1130:
1131: return &Apache::loncommon::help_open_topic($self->{HELP_FILE},
1132: $text);
1133: }
1134: sub postprocess {
1135: my $self = shift;
1136: if (defined($self->{NEXTSTATE})) {
1137: $helper->changeState($self->{NEXTSTATE});
1138: }
1139:
1140: return 1;
1141: }
1142:
1143: 1;
1144:
1145: package Apache::lonhelper::skip;
1146:
1147: =pod
1148:
1149: =head1 Elements
1150:
1151: =head2 Element: skipX<skip>
1152:
1153: The <skip> tag allows you define conditions under which the current state
1154: should be skipped over and define what state to skip to.
1155:
1156: <state name="SKIP">
1157: <skip>
1158: <clause>
1159: #some code that decides whether to skip the state or not
1160: </clause>
1161: <nextstate>FINISH</nextstate>
1162: </skip>
1163: <message nextstate="FINISH">A possibly skipped state</message>
1164: </state>
1165:
1166: =cut
1167:
1168: no strict;
1169: @ISA = ("Apache::lonhelper::element");
1170: use strict;
1171:
1172: BEGIN {
1173: &Apache::lonhelper::register('Apache::lonhelper::skip',
1174: ('skip'));
1175: }
1176:
1177: sub new {
1178: my $ref = Apache::lonhelper::element->new();
1179: bless($ref);
1180: }
1181:
1182: sub start_skip {
1183: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1184:
1185: if ($target ne 'helper') {
1186: return '';
1187: }
1188: # let <cluase> know what text to skip to
1189: $paramHash->{SKIPTAG}='/skip';
1190: return '';
1191: }
1192:
1193: sub end_skip {
1194: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1195:
1196: if ($target ne 'helper') {
1197: return '';
1198: }
1199: Apache::lonhelper::skip->new();
1200: return '';
1201: }
1202:
1203: sub render {
1204: my $self = shift;
1205: return '';
1206: }
1207: # If a NEXTSTATE is set, switch to it
1208: sub preprocess {
1209: my ($self) = @_;
1210:
1211: if (defined($self->{NEXTSTATE})) {
1212: $helper->changeState($self->{NEXTSTATE});
1213: }
1214:
1215: return 1;
1216: }
1217:
1218: 1;
1219:
1220: package Apache::lonhelper::choices;
1221:
1222: =pod
1223:
1224: =head2 Element: choicesX<choices, helper element>
1225:
1226: Choice states provide a single choice to the user as a text selection box.
1227: A "choice" is two pieces of text, one which will be displayed to the user
1228: (the "human" value), and one which will be passed back to the program
1229: (the "computer" value). For instance, a human may choose from a list of
1230: resources on disk by title, while your program wants the file name.
1231:
1232: <choices> takes an attribute "variable" to control which helper variable
1233: the result is stored in.
1234:
1235: <choices> takes an attribute "multichoice" which, if set to a true
1236: value, will allow the user to select multiple choices.
1237:
1238: <choices> takes an attribute "allowempty" which, if set to a true
1239: value, will allow the user to select none of the choices without raising
1240: an error message.
1241:
1242: =head3 SUB-TAGS
1243:
1244: <choices> can have the following subtags:X<choice, helper tag>
1245:
1246: =over 4
1247:
1248: =item * <nextstate>state_name</nextstate>: If given, this will cause the
1249: choice element to transition to the given state after executing.
1250: This will override the <nextstate> passed to <choices> (if any).
1251:
1252: =item * <choice />: If the choices are static,
1253: this element will allow you to specify them. Each choice
1254: contains attribute, "computer", as described above. The
1255: content of the tag will be used as the human label.
1256: For example,
1257: <choice computer='234-12-7312'>Bobby McDormik</choice>.
1258:
1259: <choice> can take a parameter "eval", which if set to
1260: a true value, will cause the contents of the tag to be
1261: evaluated as it would be in an <eval> tag; see <eval> tag
1262: below.
1263:
1264: <choice> may optionally contain a 'nextstate' attribute, which
1265: will be the state transistioned to if the choice is made, if
1266: the choice is not multichoice. This will override the nextstate
1267: passed to the parent C<choices> tag.
1268:
1269: <choice> may optionally contain a 'relatedvalue' attribute, which
1270: if present will cause a text entry to appear to the right of the
1271: selection. The value of the relatedvalue attribute is a variable
1272: into which the text entry will be stored e.g.:
1273: <choice computer='numberprovided" relatedvalue="num">Type the number in:</choice>
1274:
1275: <choice> may contain a relatededefault atribute which, if the
1276: relatedvalue attribute is present will be the initial value of the input
1277: box.
1278:
1279: =back
1280:
1281: To create the choices programmatically, either wrap the choices in
1282: <condition> tags (prefered), or use an <exec> block inside the <choice>
1283: tag. Store the choices in $state->{CHOICES}, which is a list of list
1284: references, where each list has three strings. The first is the human
1285: name, the second is the computer name. and the third is the option
1286: next state. For example:
1287:
1288: <exec>
1289: for (my $i = 65; $i < 65 + 26; $i++) {
1290: push @{$state->{CHOICES}}, [chr($i), $i, 'next'];
1291: }
1292: </exec>
1293:
1294: This will allow the user to select from the letters A-Z (in ASCII), while
1295: passing the ASCII value back into the helper variables, and the state
1296: will in all cases transition to 'next'.
1297:
1298: You can mix and match methods of creating choices, as long as you always
1299: "push" onto the choice list, rather then wiping it out. (You can even
1300: remove choices programmatically, but that would probably be bad form.)
1301:
1302: =head3 defaultvalue support
1303:
1304: Choices supports default values both in multichoice and single choice mode.
1305: In single choice mode, have the defaultvalue tag's function return the
1306: computer value of the box you want checked. If the function returns a value
1307: that does not correspond to any of the choices, the default behavior of selecting
1308: the first choice will be preserved.
1309:
1310: For multichoice, return a string with the computer values you want checked,
1311: delimited by triple pipes. Note this matches how the result of the <choices>
1312: tag is stored in the {VARS} hash.
1313:
1314: =cut
1315:
1316: no strict;
1317: @ISA = ("Apache::lonhelper::element");
1318: use strict;
1319: use Apache::lonlocal;
1320: use Apache::lonnet;
1321:
1322: BEGIN {
1323: &Apache::lonhelper::register('Apache::lonhelper::choices',
1324: ('choice', 'choices'));
1325: }
1326:
1327: sub new {
1328: my $ref = Apache::lonhelper::element->new();
1329: bless($ref);
1330: }
1331:
1332: # CONSTRUCTION: Construct the message element from the XML
1333: sub start_choices {
1334: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1335:
1336: if ($target ne 'helper') {
1337: return '';
1338: }
1339:
1340: # Need to initialize the choices list, so everything can assume it exists
1341: $paramHash->{'variable'} = $token->[2]{'variable'} if (!defined($paramHash->{'variable'}));
1342: $helper->declareVar($paramHash->{'variable'});
1343: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
1344: $paramHash->{'allowempty'} = $token->[2]{'allowempty'};
1345: $paramHash->{CHOICES} = [];
1346: return '';
1347: }
1348:
1349: sub end_choices {
1350: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1351:
1352: if ($target ne 'helper') {
1353: return '';
1354: }
1355: Apache::lonhelper::choices->new();
1356: return '';
1357: }
1358:
1359: sub start_choice {
1360: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1361:
1362: if ($target ne 'helper') {
1363: return '';
1364: }
1365:
1366: my $computer = $token->[2]{'computer'};
1367: my $human = &mt(&Apache::lonxml::get_all_text('/choice',
1368: $parser));
1369: my $nextstate = $token->[2]{'nextstate'};
1370: my $evalFlag = $token->[2]{'eval'};
1371: my $relatedVar = $token->[2]{'relatedvalue'};
1372: my $relatedDefault = $token->[2]{'relateddefault'};
1373: push @{$paramHash->{CHOICES}}, [&mtn($human), $computer, $nextstate,
1374: $evalFlag, $relatedVar, $relatedDefault];
1375: return '';
1376: }
1377:
1378: sub end_choice {
1379: return '';
1380: }
1381:
1382: {
1383: # used to generate unique id attributes for <input> tags.
1384: # internal use only.
1385: my $id = 0;
1386: sub new_id { return $id++; }
1387: }
1388:
1389: sub render {
1390: my $self = shift;
1391: my $var = $self->{'variable'};
1392: my $buttons = '';
1393: my $result = '';
1394:
1395: if ($self->{'multichoice'}) {
1396: $result .= <<SCRIPT;
1397: <script type="text/javascript">
1398: // <!--
1399: function checkall(value, checkName) {
1400: for (i=0; i<document.forms.helpform.elements.length; i++) {
1401: ele = document.forms.helpform.elements[i];
1402: if (ele.name == checkName + '_forminput') {
1403: document.forms.helpform.elements[i].checked=value;
1404: }
1405: }
1406: }
1407: // -->
1408: </script>
1409: SCRIPT
1410: }
1411:
1412: # Only print "select all" and "unselect all" if there are five or
1413: # more choices; fewer then that and it looks silly.
1414: if ($self->{'multichoice'} && scalar(@{$self->{CHOICES}}) > 4) {
1415: my %lt=&Apache::lonlocal::texthash(
1416: 'sa' => "Select All",
1417: 'ua' => "Unselect All");
1418: $buttons = <<BUTTONS;
1419: <br />
1420: <input type="button" onclick="checkall(true, '$var')" value="$lt{'sa'}" />
1421: <input type="button" onclick="checkall(false, '$var')" value="$lt{'ua'}" />
1422: <br />
1423: BUTTONS
1424: }
1425:
1426: if (defined $self->{ERROR_MSG}) {
1427: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br />';
1428: }
1429:
1430: $result .= $buttons;
1431:
1432: $result .= "<table>\n\n";
1433:
1434: my %checkedChoices;
1435: my $checkedChoicesFunc;
1436:
1437: if (defined($self->{DEFAULT_VALUE})) {
1438: $checkedChoicesFunc = eval ($self->{DEFAULT_VALUE});
1439: die 'Error in default value code for variable ' .
1440: $self->{'variable'} . ', Perl said: ' . $@ if $@;
1441: } else {
1442: $checkedChoicesFunc = sub { return ''; };
1443: }
1444:
1445: # Process which choices should be checked.
1446: if ($self->{'multichoice'}) {
1447: for my $selectedChoice (split(/\|\|\|/, (&$checkedChoicesFunc($helper, $self)))) {
1448: $checkedChoices{$selectedChoice} = 1;
1449: }
1450: } else {
1451: # single choice
1452: my $selectedChoice = &$checkedChoicesFunc($helper, $self);
1453:
1454: my $foundChoice = 0;
1455:
1456: # check that the choice is in the list of choices.
1457: for my $choice (@{$self->{CHOICES}}) {
1458: if ($choice->[1] eq $selectedChoice) {
1459: $checkedChoices{$choice->[1]} = 1;
1460: $foundChoice = 1;
1461: }
1462: }
1463:
1464: # If we couldn't find the choice, pick the first one
1465: if (!$foundChoice) {
1466: $checkedChoices{$self->{CHOICES}->[0]->[1]} = 1;
1467: }
1468: }
1469:
1470: my $type = "radio";
1471: if ($self->{'multichoice'}) { $type = 'checkbox'; }
1472: foreach my $choice (@{$self->{CHOICES}}) {
1473: my $id = &new_id();
1474: $result .= "<tr>\n<td width='20'> </td>\n";
1475: $result .= "<td valign='top'><input type='$type' name='${var}_forminput'"
1476: . " value='" .
1477: HTML::Entities::encode($choice->[1],"<>&\"'")
1478: . "'";
1479: if ($checkedChoices{$choice->[1]}) {
1480: $result .= " checked='checked' ";
1481: }
1482: $result .= qq{id="id$id"};
1483: my $choiceLabel = $choice->[0];
1484: if ($choice->[3]) { # if we need to evaluate this choice
1485: $choiceLabel = "sub { my $helper = shift; my $state = shift;" .
1486: $choiceLabel . "}";
1487: $choiceLabel = eval($choiceLabel);
1488: $choiceLabel = &$choiceLabel($helper, $self);
1489: }
1490: $result .= "/></td><td> ".qq{<label for="id$id">}.
1491: $choiceLabel. "</label></td>";
1492: if ($choice->[4]) {
1493: $result .='<td><input type="text" size="5" name="'
1494: .$choice->[4].'_forminput" value="'
1495: .$choice->[5].'" /></td>';
1496: }
1497: $result .= "</tr>\n";
1498: }
1499: $result .= "</table>\n\n\n";
1500: $result .= $buttons;
1501:
1502: return $result;
1503: }
1504:
1505: # If a NEXTSTATE was given or a nextstate for this choice was
1506: # given, switch to it
1507: sub postprocess {
1508: my $self = shift;
1509: my $chosenValue = $env{'form.' . $self->{'variable'} . '_forminput'};
1510:
1511: if (!defined($chosenValue) && !$self->{'allowempty'}) {
1512: $self->{ERROR_MSG} =
1513: &mt("You must choose one or more choices to continue.");
1514: return 0;
1515: }
1516:
1517: if (ref($chosenValue)) {
1518: $helper->{VARS}->{$self->{'variable'}} = join('|||', @$chosenValue);
1519: }
1520:
1521: if (defined($self->{NEXTSTATE})) {
1522: $helper->changeState($self->{NEXTSTATE});
1523: }
1524:
1525: foreach my $choice (@{$self->{CHOICES}}) {
1526: if ($choice->[1] eq $chosenValue) {
1527: if (defined($choice->[2])) {
1528: $helper->changeState($choice->[2]);
1529: }
1530: }
1531: if ($choice->[4]) {
1532: my $varname = $choice->[4];
1533: $helper->{'VARS'}->{$varname} = $env{'form.'."${varname}_forminput"};
1534: }
1535: }
1536: return 1;
1537: }
1538: 1;
1539:
1540: package Apache::lonhelper::dropdown;
1541:
1542: =pod
1543:
1544: =head2 Element: dropdownX<dropdown, helper tag>
1545:
1546: A drop-down provides a drop-down box instead of a radio button
1547: box. Because most people do not know how to use a multi-select
1548: drop-down box, that option is not allowed. Otherwise, the arguments
1549: are the same as "choices", except "allowempty" is also meaningless.
1550:
1551: <dropdown> takes an attribute "variable" to control which helper variable
1552: the result is stored in.
1553:
1554: =head3 SUB-TAGS
1555:
1556: <choice>, which acts just as it does in the "choices" element.
1557:
1558: =cut
1559:
1560: # This really ought to be a sibling class to "choice" which is itself
1561: # a child of some abstract class.... *shrug*
1562:
1563: no strict;
1564: @ISA = ("Apache::lonhelper::element");
1565: use strict;
1566: use Apache::lonlocal;
1567: use Apache::lonnet;
1568:
1569: BEGIN {
1570: &Apache::lonhelper::register('Apache::lonhelper::dropdown',
1571: ('dropdown'));
1572: }
1573:
1574: sub new {
1575: my $ref = Apache::lonhelper::element->new();
1576: bless($ref);
1577: }
1578:
1579: # CONSTRUCTION: Construct the message element from the XML
1580: sub start_dropdown {
1581: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1582:
1583: if ($target ne 'helper') {
1584: return '';
1585: }
1586:
1587: # Need to initialize the choices list, so everything can assume it exists
1588: $paramHash->{'variable'} = $token->[2]{'variable'} if (!defined($paramHash->{'variable'}));
1589: $helper->declareVar($paramHash->{'variable'});
1590: $paramHash->{CHOICES} = [];
1591: return '';
1592: }
1593:
1594: sub end_dropdown {
1595: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1596:
1597: if ($target ne 'helper') {
1598: return '';
1599: }
1600: Apache::lonhelper::dropdown->new();
1601: return '';
1602: }
1603:
1604: sub render {
1605: my $self = shift;
1606: my $var = $self->{'variable'};
1607: my $result = '';
1608:
1609: if (defined $self->{ERROR_MSG}) {
1610: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br />';
1611: }
1612:
1613: my %checkedChoices;
1614: my $checkedChoicesFunc;
1615:
1616: if (defined($self->{DEFAULT_VALUE})) {
1617: $checkedChoicesFunc = eval ($self->{DEFAULT_VALUE});
1618: die 'Error in default value code for variable ' .
1619: $self->{'variable'} . ', Perl said: ' . $@ if $@;
1620: } else {
1621: $checkedChoicesFunc = sub { return ''; };
1622: }
1623:
1624: # single choice
1625: my $selectedChoice = &$checkedChoicesFunc($helper, $self);
1626:
1627: my $foundChoice = 0;
1628:
1629: # check that the choice is in the list of choices.
1630: for my $choice (@{$self->{CHOICES}}) {
1631: if ($choice->[1] eq $selectedChoice) {
1632: $checkedChoices{$choice->[1]} = 1;
1633: $foundChoice = 1;
1634: }
1635: }
1636:
1637: # If we couldn't find the choice, pick the first one
1638: if (!$foundChoice) {
1639: $checkedChoices{$self->{CHOICES}->[0]->[1]} = 1;
1640: }
1641:
1642: $result .= "<select name='${var}_forminput'>\n";
1643: foreach my $choice (@{$self->{CHOICES}}) {
1644: $result .= "<option value='" .
1645: HTML::Entities::encode($choice->[1],"<>&\"'")
1646: . "'";
1647: if ($checkedChoices{$choice->[1]}) {
1648: $result .= " selected='selected' ";
1649: }
1650: my $choiceLabel = $choice->[0];
1651: if ($choice->[4]) { # if we need to evaluate this choice
1652: $choiceLabel = "sub { my $helper = shift; my $state = shift;" .
1653: $choiceLabel . "}";
1654: $choiceLabel = eval($choiceLabel);
1655: $choiceLabel = &$choiceLabel($helper, $self);
1656: }
1657: $result .= ">" . &mtn($choiceLabel) . "</option>\n";
1658: }
1659: $result .= "</select>\n";
1660:
1661: return $result;
1662: }
1663:
1664: # If a NEXTSTATE was given or a nextstate for this choice was
1665: # given, switch to it
1666: sub postprocess {
1667: my $self = shift;
1668: my $chosenValue = $env{'form.' . $self->{'variable'} . '_forminput'};
1669:
1670: if (!defined($chosenValue) && !$self->{'allowempty'}) {
1671: $self->{ERROR_MSG} = "You must choose one or more choices to" .
1672: " continue.";
1673: return 0;
1674: }
1675:
1676: if (defined($self->{NEXTSTATE})) {
1677: $helper->changeState($self->{NEXTSTATE});
1678: }
1679:
1680: foreach my $choice (@{$self->{CHOICES}}) {
1681: if ($choice->[1] eq $chosenValue) {
1682: if (defined($choice->[2])) {
1683: $helper->changeState($choice->[2]);
1684: }
1685: }
1686: }
1687: return 1;
1688: }
1689: 1;
1690:
1691: package Apache::lonhelper::date;
1692:
1693: =pod
1694:
1695: =head2 Element: dateX<date, helper element>
1696:
1697: Date elements allow the selection of a date with a drop down list.
1698:
1699: Date elements can take two attributes:
1700:
1701: =over 4
1702:
1703: =item * B<variable>: The name of the variable to store the chosen
1704: date in. Required.
1705:
1706: =item * B<hoursminutes>: If a true value, the date will show hours
1707: and minutes, as well as month/day/year. If false or missing,
1708: the date will only show the month, day, and year.
1709:
1710: =back
1711:
1712: Date elements contain only an option <nextstate> tag to determine
1713: the next state.
1714:
1715: Example:
1716:
1717: <date variable="DUE_DATE" hoursminutes="1">
1718: <nextstate>choose_why</nextstate>
1719: </date>
1720:
1721: =cut
1722:
1723: no strict;
1724: @ISA = ("Apache::lonhelper::element");
1725: use strict;
1726: use Apache::lonlocal; # A localization nightmare
1727: use Apache::lonnet;
1728: use DateTime;
1729:
1730: BEGIN {
1731: &Apache::lonhelper::register('Apache::lonhelper::date',
1732: ('date'));
1733: }
1734:
1735: # Don't need to override the "new" from element
1736: sub new {
1737: my $ref = Apache::lonhelper::element->new();
1738: bless($ref);
1739: }
1740:
1741: my @months = ("January", "February", "March", "April", "May", "June", "July",
1742: "August", "September", "October", "November", "December");
1743:
1744: # CONSTRUCTION: Construct the message element from the XML
1745: sub start_date {
1746: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1747:
1748: if ($target ne 'helper') {
1749: return '';
1750: }
1751:
1752: $paramHash->{'variable'} = $token->[2]{'variable'};
1753: $helper->declareVar($paramHash->{'variable'});
1754: $paramHash->{'hoursminutes'} = $token->[2]{'hoursminutes'};
1755: $paramHash->{'anytime'} = $token->[2]{'anytime'};
1756: }
1757:
1758: sub end_date {
1759: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1760:
1761: if ($target ne 'helper') {
1762: return '';
1763: }
1764: Apache::lonhelper::date->new();
1765: return '';
1766: }
1767:
1768: sub render {
1769: my $self = shift;
1770: my $result = "";
1771: my $var = $self->{'variable'};
1772:
1773: my $date;
1774:
1775: my $time=time;
1776: my ($anytime,$onclick);
1777:
1778: # first check VARS for a valid new value from the user
1779: # then check DEFAULT_VALUE for a valid default time value
1780: # otherwise pick now as reasonably good time
1781:
1782: if (defined($helper->{VARS}{$var})
1783: && $helper->{VARS}{$var} > 0) {
1784: $date = &get_date_object($helper->{VARS}{$var});
1785: } elsif (defined($self->{DEFAULT_VALUE})) {
1786: my $valueFunc = eval($self->{DEFAULT_VALUE});
1787: die('Error in default value code for variable ' .
1788: $self->{'variable'} . ', Perl said: ' . $@) if $@;
1789: $time = &$valueFunc($helper, $self);
1790: if (lc($time) eq 'anytime') {
1791: $anytime=1;
1792: $date = &get_date_object(time);
1793: $date->min(0);
1794: } elsif (defined($time) && $time ne 0) {
1795: $date = &get_date_object($time);
1796: } else {
1797: # leave date undefined so it'll default to now
1798: }
1799: }
1800:
1801: if (!defined($date)) {
1802: $date = &get_date_object(time);
1803: $date->min(0);
1804: }
1805:
1806: if ($anytime) {
1807: $onclick = "onclick=\"javascript:updateCheck(this.form,'${var}anytime',false)\"";
1808: }
1809: # Default date: The current hour.
1810:
1811: if (defined $self->{ERROR_MSG}) {
1812: $result .= '<font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
1813: }
1814:
1815: # Month
1816: my $i;
1817: $result .= "<select $onclick name='${var}month'>\n";
1818: for ($i = 0; $i < 12; $i++) {
1819: if (($i + 1) == $date->mon) {
1820: $result .= "<option value='$i' selected='selected'>";
1821: } else {
1822: $result .= "<option value='$i'>";
1823: }
1824: $result .= &mt($months[$i])."</option>\n";
1825: }
1826: $result .= "</select>\n";
1827:
1828: # Day
1829: $result .= "<select $onclick name='${var}day'>\n";
1830: for ($i = 1; $i < 32; $i++) {
1831: if ($i == $date->mday) {
1832: $result .= '<option selected="selected">';
1833: } else {
1834: $result .= '<option>';
1835: }
1836: $result .= "$i</option>\n";
1837: }
1838: $result .= "</select>,\n";
1839:
1840: # Year
1841: $result .= "<select $onclick name='${var}year'>\n";
1842: for ($i = 2000; $i < 2030; $i++) { # update this after 64-bit dates
1843: if ($date->year == $i) {
1844: $result .= "<option selected='selected'>";
1845: } else {
1846: $result .= "<option>";
1847: }
1848: $result .= "$i</option>\n";
1849: }
1850: $result .= "</select>,\n";
1851:
1852: # Display Hours and Minutes if they are called for
1853: if ($self->{'hoursminutes'}) {
1854: # This needs parameterization for times.
1855: my $am = &mt('a.m.');
1856: my $pm = &mt('p.m.');
1857: # Build hour
1858: $result .= "<select $onclick name='${var}hour'>\n";
1859: $result .= "<option " . ($date->hour == 0 ? 'selected="selected" ':'') .
1860: " value='0'>" . &mt('midnight') . "</option>\n";
1861: for ($i = 1; $i < 12; $i++) {
1862: if ($date->hour == $i) {
1863: $result .= "<option selected='selected' value='$i'>$i $am</option>\n";
1864: } else {
1865: $result .= "<option value='$i'>$i $am</option>\n";
1866: }
1867: }
1868: $result .= "<option " . ($date->hour == 12 ? 'selected="selected" ':'') .
1869: " value='12'>" . &mt('noon') . "</option>\n";
1870: for ($i = 13; $i < 24; $i++) {
1871: my $printedHour = $i - 12;
1872: if ($date->hour == $i) {
1873: $result .= "<option selected='selected' value='$i'>$printedHour $pm</option>\n";
1874: } else {
1875: $result .= "<option value='$i'>$printedHour $pm</option>\n";
1876: }
1877: }
1878:
1879: $result .= "</select> :\n";
1880:
1881: $result .= "<select $onclick name='${var}minute'>\n";
1882: my $selected=0;
1883: for my $i ((0,15,30,45,59,undef,0..59)) {
1884: my $printedMinute = $i;
1885: if (defined($i) && $i < 10) {
1886: $printedMinute = "0" . $printedMinute;
1887: }
1888: if (!$selected && $date->min == $i) {
1889: $result .= "<option selected='selected'>";
1890: $selected=1;
1891: } else {
1892: $result .= "<option>";
1893: }
1894: $result .= "$printedMinute</option>\n";
1895: }
1896: $result .= "</select>\n";
1897: }
1898: $result .= ' '.$date->time_zone_short_name().' ';
1899: if ($self->{'anytime'}) {
1900: $result.=(<<CHECK);
1901: <script type="text/javascript">
1902: // <!--
1903: function updateCheck(form,name,value) {
1904: var checkbox=form[name];
1905: checkbox.checked = value;
1906: }
1907: // -->
1908: </script>
1909: CHECK
1910: $result.=" or <label><input type='checkbox' ";
1911: if ($anytime) {
1912: $result.=' checked="checked" '
1913: }
1914: $result.="name='${var}anytime'/>".&mt('Any time').'</label>'
1915: }
1916: return $result;
1917:
1918: }
1919: # If a NEXTSTATE was given, switch to it
1920: sub postprocess {
1921: my $self = shift;
1922: my $var = $self->{'variable'};
1923: if ($env{'form.' . $var . 'anytime'}) {
1924: $helper->{VARS}->{$var} = undef;
1925: } else {
1926: my $month = $env{'form.' . $var . 'month'};
1927: $month ++;
1928: my $day = $env{'form.' . $var . 'day'};
1929: my $year = $env{'form.' . $var . 'year'};
1930: my $min = 0;
1931: my $hour = 0;
1932: if ($self->{'hoursminutes'}) {
1933: $min = $env{'form.' . $var . 'minute'};
1934: $hour = $env{'form.' . $var . 'hour'};
1935: }
1936:
1937: my ($chosenDate,$checkDate);
1938: my $timezone = &Apache::lonlocal::gettimezone();
1939: my $dt;
1940: eval {
1941: $dt = DateTime->new( year => $year,
1942: month => $month,
1943: day => $day,
1944: hour => $hour,
1945: minute => $min,
1946: second => 0,
1947: time_zone => $timezone,
1948: );
1949: };
1950:
1951: my $error = $@;
1952: if (!$error) {
1953: $chosenDate = $dt->epoch;
1954: $checkDate = &get_date_object($chosenDate);
1955: }
1956:
1957: # Check to make sure that the date was not automatically co-erced into a
1958: # valid date, as we want to flag that as an error
1959: # This happens for "Feb. 31", for instance, which is coerced to March 2 or
1960: # 3, depending on if it's a leap year
1961:
1962: if ($error || $checkDate->mon != $month || $checkDate->mday != $day ||
1963: $checkDate->year != $year) {
1964: unless (Apache::lonlocal::current_language()== ~/^en/) {
1965: $self->{ERROR_MSG} = &mt("Invalid date entry");
1966: return 0;
1967: }
1968: # LOCALIZATION FIXME: Needs to be parameterized
1969: $self->{ERROR_MSG} = "Can't use ".$months[$env{'form.'.$var.'month'}]. " $day, $year as a ".
1970: "date because it doesn't exist. Please enter a valid date.";
1971:
1972: return 0;
1973: }
1974: $helper->{VARS}->{$var} = $chosenDate;
1975: }
1976:
1977: if (defined($self->{VALIDATOR})) {
1978: my $validator = eval($self->{VALIDATOR});
1979: die 'Died during evaluation of validator code; Perl said: ' . $@ if $@;
1980: my $invalid = &$validator($helper, $state, $self, $self->getValue());
1981: if ($invalid) {
1982: $self->{ERROR_MSG} = $invalid;
1983: return 0;
1984: }
1985: }
1986:
1987: if (defined($self->{NEXTSTATE})) {
1988: $helper->changeState($self->{NEXTSTATE});
1989: }
1990:
1991: return 1;
1992: }
1993:
1994: sub get_date_object {
1995: my ($epoch) = @_;
1996: my $dt = DateTime->from_epoch(epoch => $epoch)
1997: ->set_time_zone(&Apache::lonlocal::gettimezone());
1998: my $lang = Apache::lonlocal::current_language();
1999: if ($lang ne '') {
2000: eval {
2001: $dt->set_locale($lang);
2002: };
2003: }
2004: return $dt;
2005: }
2006:
2007: 1;
2008:
2009: package Apache::lonhelper::resource;
2010:
2011: =pod
2012:
2013: =head2 Element: resourceX<resource, helper element>
2014:
2015: <resource> elements allow the user to select one or multiple resources
2016: from the current course. You can filter out which resources they can view,
2017: and filter out which resources they can select. The course will always
2018: be displayed fully expanded, because of the difficulty of maintaining
2019: selections across folder openings and closings. If this is fixed, then
2020: the user can manipulate the folders.
2021:
2022: <resource> takes the standard variable attribute to control what helper
2023: variable stores the results. It also takes a "multichoice"X<multichoice> attribute,
2024: which controls whether the user can select more then one resource. The
2025: "toponly" attribute controls whether the resource display shows just the
2026: resources in that sequence, or recurses into all sub-sequences, defaulting
2027: to false. The "suppressEmptySequences" attribute reflects the
2028: suppressEmptySequences argument to the render routine, which will cause
2029: folders that have all of their contained resources filtered out to also
2030: be filtered out. The 'addstatus' attribute, if true, will add the icon
2031: and long status display columns to the display. The 'addparts'
2032: attribute will add in a part selector beside problems that have more
2033: than 1 part. The 'includecourse' attribute if true, will include
2034: the toplevel default.sequence in the results.
2035:
2036: =head3 SUB-TAGS
2037:
2038: =over 4
2039:
2040: =item * <filterfunc>X<filterfunc>: If you want to filter what resources are displayed
2041: to the user, use a filter func. The <filterfunc> tag should contain
2042: Perl code that when wrapped with "sub { my $res = shift; " and "}" is
2043: a function that returns true if the resource should be displayed,
2044: and false if it should be skipped. $res is a resource object.
2045: (See Apache::lonnavmaps documentation for information about the
2046: resource object.)
2047:
2048: =item * <choicefunc>X<choicefunc>: Same as <filterfunc>, except that controls whether
2049: the given resource can be chosen. (It is almost always a good idea to
2050: show the user the folders, for instance, but you do not always want to
2051: let the user select them.)
2052:
2053: =item * <nextstate>: Standard nextstate behavior.
2054:
2055: =item * <valuefunc>X<valuefunc>: This function controls what is returned by the resource
2056: when the user selects it. Like filterfunc and choicefunc, it should be
2057: a function fragment that when wrapped by "sub { my $res = shift; " and
2058: "}" returns a string representing what you want to have as the value. By
2059: default, the value will be the resource ID of the object ($res->{ID}).
2060:
2061: =item * <mapurl>X<mapurl>: If the URL of a map is given here, only that map
2062: will be displayed, instead of the whole course. If the attribute
2063: "evaluate" is given and is true, the contents of the mapurl will be
2064: evaluated with "sub { my $helper = shift; my $state = shift;" and
2065: "}", with the return value used as the mapurl.
2066:
2067: =back
2068:
2069: =cut
2070:
2071: no strict;
2072: @ISA = ("Apache::lonhelper::element");
2073: use strict;
2074: use Apache::lonnet;
2075:
2076: BEGIN {
2077: &Apache::lonhelper::register('Apache::lonhelper::resource',
2078: ('resource', 'filterfunc',
2079: 'choicefunc', 'valuefunc',
2080: 'mapurl','option'));
2081: }
2082:
2083: sub new {
2084: my $ref = Apache::lonhelper::element->new();
2085: bless($ref);
2086: }
2087:
2088: # CONSTRUCTION: Construct the message element from the XML
2089: sub start_resource {
2090: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2091:
2092: if ($target ne 'helper') {
2093: return '';
2094: }
2095:
2096: $paramHash->{'variable'} = $token->[2]{'variable'};
2097: $helper->declareVar($paramHash->{'variable'});
2098: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
2099: $paramHash->{'suppressEmptySequences'} = $token->[2]{'suppressEmptySequences'};
2100: $paramHash->{'toponly'} = $token->[2]{'toponly'};
2101: $paramHash->{'addstatus'} = $token->[2]{'addstatus'};
2102: $paramHash->{'addparts'} = $token->[2]{'addparts'};
2103: if ($paramHash->{'addparts'}) {
2104: $helper->declareVar($paramHash->{'variable'}.'_part');
2105: }
2106: $paramHash->{'closeallpages'} = $token->[2]{'closeallpages'};
2107: $paramHash->{'include_top_level_map'} = $token->[2]{'includecourse'};
2108: return '';
2109: }
2110:
2111: sub end_resource {
2112: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2113:
2114: if ($target ne 'helper') {
2115: return '';
2116: }
2117: if (!defined($paramHash->{FILTER_FUNC})) {
2118: $paramHash->{FILTER_FUNC} = sub {return 1;};
2119: }
2120: if (!defined($paramHash->{CHOICE_FUNC})) {
2121: $paramHash->{CHOICE_FUNC} = sub {return 1;};
2122: }
2123: if (!defined($paramHash->{VALUE_FUNC})) {
2124: $paramHash->{VALUE_FUNC} = sub {my $res = shift; return $res->{ID}; };
2125: }
2126: Apache::lonhelper::resource->new();
2127: return '';
2128: }
2129:
2130: sub start_filterfunc {
2131: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2132:
2133: if ($target ne 'helper') {
2134: return '';
2135: }
2136:
2137: my $contents = Apache::lonxml::get_all_text('/filterfunc',
2138: $parser);
2139: $contents = 'sub { my $res = shift; ' . $contents . '}';
2140: $paramHash->{FILTER_FUNC} = eval $contents;
2141: }
2142:
2143: sub end_filterfunc { return ''; }
2144:
2145: sub start_choicefunc {
2146: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2147:
2148: if ($target ne 'helper') {
2149: return '';
2150: }
2151:
2152: my $contents = Apache::lonxml::get_all_text('/choicefunc',
2153: $parser);
2154: $contents = 'sub { my $res = shift; ' . $contents . '}';
2155: $paramHash->{CHOICE_FUNC} = eval $contents;
2156: }
2157:
2158: sub end_choicefunc { return ''; }
2159:
2160: sub start_valuefunc {
2161: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2162:
2163: if ($target ne 'helper') {
2164: return '';
2165: }
2166:
2167: my $contents = Apache::lonxml::get_all_text('/valuefunc',
2168: $parser);
2169: $contents = 'sub { my $res = shift; ' . $contents . '}';
2170: $paramHash->{VALUE_FUNC} = eval $contents;
2171: }
2172:
2173: sub end_valuefunc { return ''; }
2174:
2175: sub start_mapurl {
2176: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2177:
2178: if ($target ne 'helper') {
2179: return '';
2180: }
2181:
2182: my $contents = Apache::lonxml::get_all_text('/mapurl',
2183: $parser);
2184: $paramHash->{EVAL_MAP_URL} = $token->[2]{'evaluate'};
2185: $paramHash->{MAP_URL} = $contents;
2186: }
2187:
2188: sub end_mapurl { return ''; }
2189:
2190:
2191: sub start_option {
2192: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2193: if (!defined($paramHash->{OPTION_TEXTS})) {
2194: $paramHash->{OPTION_TEXTS} = [ ];
2195: $paramHash->{OPTION_VARS} = [ ];
2196:
2197: }
2198: # OPTION_TEXTS is a list of the text attribute
2199: # values used to create column headings.
2200: # OPTION_VARS is a list of the variable names, used to create the checkbox
2201: # inputs.
2202: # We're ok with empty elements. as place holders
2203: # Although the 'variable' element should really exist.
2204: #
2205:
2206: my $option_texts = $paramHash->{OPTION_TEXTS};
2207: my $option_vars = $paramHash->{OPTION_VARS};
2208: push(@$option_texts, $token->[2]{'text'});
2209: push(@$option_vars, $token->[2]{'variable'});
2210:
2211: # Need to create and declare the option variables as well to make them
2212: # persistent.
2213: #
2214: my $varname = $token->[2]{'variable'};
2215: $helper->declareVar($varname);
2216:
2217:
2218: return '';
2219: }
2220:
2221: sub end_option {
2222: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2223: return '';
2224: }
2225:
2226: # A note, in case I don't get to this before I leave.
2227: # If someone complains about the "Back" button returning them
2228: # to the previous folder state, instead of returning them to
2229: # the previous helper state, the *correct* answer is for the helper
2230: # to keep track of how many times the user has manipulated the folders,
2231: # and feed that to the history.go() call in the helper rendering routines.
2232: # If done correctly, the helper itself can keep track of how many times
2233: # it renders the same states, so it doesn't go in just this state, and
2234: # you can lean on the browser back button to make sure it all chains
2235: # correctly.
2236: # Right now, though, I'm just forcing all folders open.
2237:
2238: sub render {
2239: my $self = shift;
2240: my $result = "";
2241: my $var = $self->{'variable'};
2242: my $curVal = $helper->{VARS}->{$var};
2243:
2244: my $buttons = '';
2245:
2246: if ($self->{'multichoice'}) {
2247: $result = <<SCRIPT;
2248: <script type="text/javascript">
2249: // <!--
2250: function checkall(value, checkName) {
2251: for (i=0; i<document.forms.helpform.elements.length; i++) {
2252: ele = document.forms.helpform.elements[i];
2253: if (ele.name == checkName + '_forminput') {
2254: document.forms.helpform.elements[i].checked=value;
2255: }
2256: }
2257: }
2258: // -->
2259: </script>
2260: SCRIPT
2261: my %lt=&Apache::lonlocal::texthash(
2262: 'sar' => "Select All Resources",
2263: 'uar' => "Unselect All Resources");
2264:
2265: $buttons = <<BUTTONS;
2266: <br />
2267: <input type="button" onclick="checkall(true, '$var')" value="$lt{'sar'}" />
2268: <input type="button" onclick="checkall(false, '$var')" value="$lt{'uar'}" />
2269: <br />
2270: BUTTONS
2271: }
2272:
2273: if (defined $self->{ERROR_MSG}) {
2274: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
2275: }
2276:
2277: $result .= $buttons;
2278:
2279: my $filterFunc = $self->{FILTER_FUNC};
2280: my $choiceFunc = $self->{CHOICE_FUNC};
2281: my $valueFunc = $self->{VALUE_FUNC};
2282: my $multichoice = $self->{'multichoice'};
2283: my $option_vars = $self->{OPTION_VARS};
2284: my $option_texts = $self->{OPTION_TEXTS};
2285: my $addparts = $self->{'addparts'};
2286: my $headings_done = 0;
2287:
2288: # Evaluate the map url as needed
2289: my $mapUrl;
2290: if ($self->{EVAL_MAP_URL}) {
2291: my $mapUrlFunc = eval('sub { my $helper = shift; my $state = shift; ' .
2292: $self->{MAP_URL} . '}');
2293: $mapUrl = &$mapUrlFunc($helper, $self);
2294: } else {
2295: $mapUrl = $self->{MAP_URL};
2296: }
2297:
2298: my %defaultSymbs;
2299: if (defined($self->{DEFAULT_VALUE})) {
2300: my $valueFunc = eval($self->{DEFAULT_VALUE});
2301: die 'Error in default value code for variable ' .
2302: $self->{'variable'} . ', Perl said: ' . $@ if $@;
2303: my @defaultSymbs = &$valueFunc($helper, $self);
2304: if (!$multichoice && @defaultSymbs) { # only allowed 1
2305: @defaultSymbs = ($defaultSymbs[0]);
2306: }
2307: %defaultSymbs = map { if ($_) {($_,1) } } @defaultSymbs;
2308: delete($defaultSymbs{''});
2309: }
2310:
2311: # Create the composite function that renders the column on the nav map
2312: # have to admit any language that lets me do this can't be all bad
2313: # - Jeremy (Pythonista) ;-)
2314: my $checked = 0;
2315: my $renderColFunc = sub {
2316: my ($resource, $part, $params) = @_;
2317: my $result = "";
2318:
2319: if(!$headings_done) {
2320: if ($option_texts) {
2321: foreach my $text (@$option_texts) {
2322: $result .= "<th>$text</th>";
2323: }
2324: }
2325: $result .= "<th>Select</th>";
2326: $result .= "</tr><tr>"; # Close off the extra row and start a new one.
2327: $headings_done = 1;
2328: }
2329:
2330: my $inputType;
2331: if ($multichoice) { $inputType = 'checkbox'; }
2332: else {$inputType = 'radio'; }
2333:
2334: if (!&$choiceFunc($resource)) {
2335: $result .= '<td> </td>';
2336: return $result;
2337: } else {
2338: my $col = "";
2339: my $raw_name = &$valueFunc($resource);
2340: my $resource_name =
2341: HTML::Entities::encode($raw_name,"<>&\"'");
2342: if($option_vars) {
2343: foreach my $option_var (@$option_vars) {
2344: my $var_value = "\|\|\|" . $helper->{VARS}->{$option_var} .
2345: "\|\|\|";
2346: my $checked ="";
2347: if($var_value =~ /\Q|||$raw_name|||\E/) {
2348: $checked = "checked='checked'";
2349: }
2350: $col .=
2351: "<td align='center'><input type='checkbox' name ='$option_var".
2352: "_forminput' value='".
2353: $resource_name . "' $checked /> </td>";
2354: }
2355: }
2356:
2357: $col .= "<td align='center'><input type='$inputType' name='${var}_forminput' ";
2358: if (%defaultSymbs) {
2359: my $symb=$resource->symb();
2360: if (exists($defaultSymbs{$symb})) {
2361: $col .= "checked='checked' ";
2362: $checked = 1;
2363: }
2364: } else {
2365: if (!$checked && !$multichoice) {
2366: $col .= "checked='checked' ";
2367: $checked = 1;
2368: }
2369: if ($multichoice) { # all resources start checked; see bug 1174
2370: $col .= "checked='checked' ";
2371: $checked = 1;
2372: }
2373: }
2374: $col .= "value='" . $resource_name . "' /></td>";
2375:
2376: return $result.$col;
2377: }
2378: };
2379: my $renderPartsFunc = sub {
2380: my ($resource, $part, $params) = @_;
2381: my $col= "<td>";
2382: my $id=$resource->{ID};
2383: my $resource_name =
2384: &HTML::Entities::encode(&$valueFunc($resource),"<>&\"'");
2385: if ($addparts && (scalar(@{$resource->parts}) > 1)) {
2386: $col .= "<select onclick=\"javascript:updateRadio(this.form,'${var}_forminput','$resource_name');updateHidden(this.form,'$id','${var}');\" name='part_${id}_forminput'>\n";
2387: $col .= "<option value=\"$part\">All Parts</option>\n";
2388: foreach my $part (@{$resource->parts}) {
2389: $col .= "<option value=\"$part\">Part: $part</option>\n";
2390: }
2391: $col .= "</select>";
2392: }
2393: $col .= "</td>";
2394: };
2395: $result.=(<<RADIO);
2396: <script type="text/javascript">
2397: // <!--
2398: function updateRadio(form,name,value) {
2399: var radiobutton=form[name];
2400: for (var i=0; i<radiobutton.length; i++) {
2401: if (radiobutton[i].value == value) {
2402: radiobutton[i].checked = true;
2403: break;
2404: }
2405: }
2406: }
2407: function updateHidden(form,id,name) {
2408: var select=form['part_'+id+'_forminput'];
2409: var hidden=form[name+'_part_forminput'];
2410: var which=select.selectedIndex;
2411: hidden.value=select.options[which].value;
2412: }
2413: // -->
2414: </script>
2415: <input type="hidden" name="${var}_part_forminput" />
2416:
2417: RADIO
2418: $env{'form.condition'} = !$self->{'toponly'};
2419: my $cols = [$renderColFunc];
2420: if ($self->{'addparts'}) { push(@$cols, $renderPartsFunc); }
2421: push(@$cols, Apache::lonnavmaps::resource());
2422: if ($self->{'addstatus'}) {
2423: push @$cols, (Apache::lonnavmaps::part_status_summary());
2424:
2425: }
2426: $result .=
2427: &Apache::lonnavmaps::render( { 'cols' => $cols,
2428: 'showParts' => 0,
2429: 'filterFunc' => $filterFunc,
2430: 'resource_no_folder_link' => 1,
2431: 'closeAllPages' => $self->{'closeallpages'},
2432: 'suppressEmptySequences' => $self->{'suppressEmptySequences'},
2433: 'include_top_level_map' => $self->{'include_top_level_map'},
2434: 'iterator_map' => $mapUrl }
2435: );
2436:
2437: $result .= $buttons;
2438:
2439: return $result;
2440: }
2441:
2442: sub postprocess {
2443: my $self = shift;
2444:
2445: if ($self->{'multichoice'} && !$helper->{VARS}->{$self->{'variable'}}) {
2446: $self->{ERROR_MSG} = 'You must choose at least one resource to continue.';
2447: return 0;
2448: }
2449:
2450: if (defined($self->{NEXTSTATE})) {
2451: $helper->changeState($self->{NEXTSTATE});
2452: }
2453:
2454: return 1;
2455: }
2456:
2457: 1;
2458:
2459: package Apache::lonhelper::student;
2460:
2461: =pod
2462:
2463: =head2 Element: studentX<student, helper element>
2464:
2465: Student elements display a choice of students enrolled in the current
2466: course. Currently it is primitive; this is expected to evolve later.
2467:
2468: Student elements take the following attributes:
2469:
2470: =over 4
2471:
2472: =item * B<variable>:
2473:
2474: Does what it usually does: declare which helper variable to put the
2475: result in.
2476:
2477: =item * B<multichoice>:
2478:
2479: If true allows the user to select multiple students. Defaults to false.
2480:
2481: =item * B<coursepersonnel>:
2482:
2483: If true adds the course personnel to the top of the student
2484: selection. Defaults to false.
2485:
2486: =item * B<activeonly>:
2487:
2488: If true, only active students and course personnel will be
2489: shown. Defaults to false.
2490:
2491: =item * B<emptyallowed>:
2492:
2493: If true, the selection of no users is allowed. Defaults to false.
2494:
2495: =back
2496:
2497: =cut
2498:
2499: no strict;
2500: @ISA = ("Apache::lonhelper::element");
2501: use strict;
2502: use Apache::lonlocal;
2503: use Apache::lonnet;
2504:
2505: BEGIN {
2506: &Apache::lonhelper::register('Apache::lonhelper::student',
2507: ('student'));
2508: }
2509:
2510: sub new {
2511: my $ref = Apache::lonhelper::element->new();
2512: bless($ref);
2513: }
2514:
2515: sub start_student {
2516: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2517:
2518: if ($target ne 'helper') {
2519: return '';
2520: }
2521:
2522: $paramHash->{'variable'} = $token->[2]{'variable'};
2523: $helper->declareVar($paramHash->{'variable'});
2524: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
2525: $paramHash->{'coursepersonnel'} = $token->[2]{'coursepersonnel'};
2526: $paramHash->{'activeonly'} = $token->[2]{'activeonly'};
2527: if (defined($token->[2]{'nextstate'})) {
2528: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
2529: }
2530: $paramHash->{'emptyallowed'} = $token->[2]{'emptyallowed'};
2531:
2532: }
2533:
2534: sub end_student {
2535: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2536:
2537: if ($target ne 'helper') {
2538: return '';
2539: }
2540: Apache::lonhelper::student->new();
2541: }
2542:
2543: sub render {
2544: my $self = shift;
2545: my $result = '';
2546: my $buttons = '';
2547: my $var = $self->{'variable'};
2548:
2549:
2550: if (defined $self->{ERROR_MSG}) {
2551: $result .= '<font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
2552: }
2553:
2554: my %defaultUsers;
2555: if (defined($self->{DEFAULT_VALUE})) {
2556: my $valueFunc = eval($self->{DEFAULT_VALUE});
2557: die 'Error in default value code for variable ' .
2558: $self->{'variable'} . ', Perl said: ' . $@ if $@;
2559: my @defaultUsers = &$valueFunc($helper, $self);
2560: if (!$self->{'multichoice'} && @defaultUsers) { # only allowed 1
2561: @defaultUsers = ($defaultUsers[0]);
2562: }
2563: %defaultUsers = map { if ($_) {($_,1) } } @defaultUsers;
2564: delete($defaultUsers{''});
2565: }
2566:
2567:
2568: my ($course_personnel,
2569: $current_members,
2570: $expired_members,
2571: $future_members) =
2572: &Apache::lonselstudent::get_people_in_class($env{'request.course.sec'});
2573:
2574:
2575:
2576: # Load up the non-students, if necessary
2577:
2578: if ($self->{'coursepersonnel'}) {
2579: unshift @$current_members, (@$course_personnel);
2580: }
2581:
2582:
2583: # Current personel
2584:
2585: $result .= '<h4>'.&mt('Select Currently Enrolled Students and Active Course Personnel').'</h4>';
2586: $result .= &Apache::lonselstudent::render_student_list( $current_members,
2587: "helpform",
2588: "current",
2589: \%defaultUsers,
2590: $self->{'multichoice'},
2591: $self->{'variable'},
2592: 1);
2593:
2594:
2595: # If activeonly is not set then we can also give the expired students:
2596: #
2597: if (!$self->{'activeonly'} && ((scalar(@$future_members)) > 0)) {
2598:
2599: # And future.
2600:
2601: $result .= '<h4>'.&mt('Select Future Enrolled Students and Future Course Personnel').'</h4>';
2602:
2603: $result .= &Apache::lonselstudent::render_student_list( $future_members,
2604: "helpform",
2605: "future",
2606: \%defaultUsers,
2607: $self->{'multichoice'},
2608: $self->{'variable'},
2609: 0);
2610: }
2611: if (!$self->{'activeonly'} && ((scalar(@$expired_members)) > 0)) {
2612: # Past
2613:
2614: $result .= '<h4>'.&mt('Select Previously Enrolled Students and Inactive Course Personnel').'</h4>';
2615: $result .= &Apache::lonselstudent::render_student_list($expired_members,
2616: "helpform",
2617: "past",
2618: \%defaultUsers,
2619: $self->{'multichoice'},
2620: $self->{'variable'},
2621: 0);
2622: }
2623:
2624:
2625:
2626: return $result;
2627: }
2628:
2629: sub postprocess {
2630: my $self = shift;
2631:
2632: my $result = $env{'form.' . $self->{'variable'} . '_forminput'};
2633: if (!$result && !$self->{'emptyallowed'}) {
2634: if ($self->{'coursepersonnel'}) {
2635: $self->{ERROR_MSG} =
2636: &mt('You must choose at least one user to continue.');
2637: } else {
2638: $self->{ERROR_MSG} =
2639: &mt('You must choose at least one student to continue.');
2640: }
2641: return 0;
2642: }
2643:
2644: if (defined($self->{NEXTSTATE})) {
2645: $helper->changeState($self->{NEXTSTATE});
2646: }
2647:
2648: return 1;
2649: }
2650:
2651: 1;
2652:
2653: package Apache::lonhelper::files;
2654:
2655: =pod
2656:
2657: =head2 Element: filesX<files, helper element>
2658:
2659: files allows the users to choose files from a given directory on the
2660: server. It is always multichoice and stores the result as a triple-pipe
2661: delimited entry in the helper variables.
2662:
2663: Since it is extremely unlikely that you can actually code a constant
2664: representing the directory you wish to allow the user to search, <files>
2665: takes a subroutine that returns the name of the directory you wish to
2666: have the user browse.
2667:
2668: files accepts the attribute "variable" to control where the files chosen
2669: are put. It accepts the attribute "multichoice" as the other attribute,
2670: defaulting to false, which if true will allow the user to select more
2671: then one choice.
2672:
2673: <files> accepts three subtags:
2674:
2675: =over 4
2676:
2677: =item * B<nextstate>: works as it does with the other tags.
2678:
2679: =item * B<filechoice>: When the contents of this tag are surrounded by
2680: "sub {" and "}", will return a string representing what directory
2681: on the server to allow the user to choose files from.
2682:
2683: =item * B<filefilter>: Should contain Perl code that when surrounded
2684: by "sub { my $filename = shift; " and "}", returns a true value if
2685: the user can pick that file, or false otherwise. The filename
2686: passed to the function will be just the name of the file, with no
2687: path info. By default, a filter function will be used that will
2688: mask out old versions of files. This function is available as
2689: Apache::lonhelper::files::not_old_version if you want to use it to
2690: composite your own filters.
2691:
2692: =back
2693:
2694: B<General security note>: You should ensure the user can not somehow
2695: pass something into your code that would allow them to look places
2696: they should not be able to see, like the C</etc/> directory. However,
2697: the security impact would be minimal, since it would only expose
2698: the existence of files, there should be no way to parlay that into
2699: viewing the files.
2700:
2701: =cut
2702:
2703: no strict;
2704: @ISA = ("Apache::lonhelper::element");
2705: use strict;
2706: use Apache::lonlocal;
2707: use Apache::lonnet;
2708: use Apache::lonpubdir; # for getTitleString
2709:
2710: BEGIN {
2711: &Apache::lonhelper::register('Apache::lonhelper::files',
2712: ('files', 'filechoice', 'filefilter'));
2713: }
2714:
2715: sub not_old_version {
2716: my $file = shift;
2717:
2718: # Given a file name, return false if it is an "old version" of a
2719: # file, or true if it is not.
2720:
2721: if ($file =~ /^.*\.[0-9]+\.[A-Za-z]+(\.meta)?$/) {
2722: return 0;
2723: }
2724: return 1;
2725: }
2726:
2727: sub new {
2728: my $ref = Apache::lonhelper::element->new();
2729: bless($ref);
2730: }
2731:
2732: sub start_files {
2733: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2734:
2735: if ($target ne 'helper') {
2736: return '';
2737: }
2738: $paramHash->{'variable'} = $token->[2]{'variable'};
2739: $helper->declareVar($paramHash->{'variable'});
2740: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
2741: }
2742:
2743: sub end_files {
2744: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2745:
2746: if ($target ne 'helper') {
2747: return '';
2748: }
2749: if (!defined($paramHash->{FILTER_FUNC})) {
2750: $paramHash->{FILTER_FUNC} = sub { return 1; };
2751: }
2752: Apache::lonhelper::files->new();
2753: }
2754:
2755: sub start_filechoice {
2756: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2757:
2758: if ($target ne 'helper') {
2759: return '';
2760: }
2761: $paramHash->{'filechoice'} = Apache::lonxml::get_all_text('/filechoice',
2762: $parser);
2763: }
2764:
2765: sub end_filechoice { return ''; }
2766:
2767: sub start_filefilter {
2768: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2769:
2770: if ($target ne 'helper') {
2771: return '';
2772: }
2773:
2774: my $contents = Apache::lonxml::get_all_text('/filefilter',
2775: $parser);
2776: $contents = 'sub { my $filename = shift; ' . $contents . '}';
2777: $paramHash->{FILTER_FUNC} = eval $contents;
2778: }
2779:
2780: sub end_filefilter { return ''; }
2781:
2782: {
2783: # used to generate unique id attributes for <input> tags.
2784: # internal use only.
2785: my $id=0;
2786: sub new_id { return $id++;}
2787: }
2788:
2789: sub render {
2790: my $self = shift;
2791: my $result = '';
2792: my $var = $self->{'variable'};
2793:
2794: my $subdirFunc = eval('sub {' . $self->{'filechoice'} . '}');
2795: die 'Error in resource filter code for variable ' .
2796: {'variable'} . ', Perl said:' . $@ if $@;
2797:
2798: my $subdir = &$subdirFunc();
2799:
2800: my $filterFunc = $self->{FILTER_FUNC};
2801: if (!defined($filterFunc)) {
2802: $filterFunc = ¬_old_version;
2803: }
2804: my $buttons = '';
2805: my $type = 'radio';
2806: if ($self->{'multichoice'}) {
2807: $type = 'checkbox';
2808: }
2809:
2810: if ($self->{'multichoice'}) {
2811: $result = <<SCRIPT;
2812: <script type="text/javascript">
2813: // <!--
2814: function checkall(value, checkName) {
2815: for (i=0; i<document.forms.helpform.elements.length; i++) {
2816: ele = document.forms.helpform.elements[i];
2817: if (ele.name == checkName + '_forminput') {
2818: document.forms.helpform.elements[i].checked=value;
2819: }
2820: }
2821: }
2822:
2823: function checkallclass(value, className) {
2824: for (i=0; i<document.forms.helpform.elements.length; i++) {
2825: ele = document.forms.helpform.elements[i];
2826: if (ele.type == "$type" && ele.onclick) {
2827: document.forms.helpform.elements[i].checked=value;
2828: }
2829: }
2830: }
2831: // -->
2832: </script>
2833: SCRIPT
2834: my %lt=&Apache::lonlocal::texthash(
2835: 'saf' => "Select All Files",
2836: 'uaf' => "Unselect All Files");
2837: $buttons = <<BUTTONS;
2838: <br />
2839: <input type="button" onclick="checkall(true, '$var')" value="$lt{'saf'}" />
2840: <input type="button" onclick="checkall(false, '$var')" value="$lt{'uaf'}" />
2841: BUTTONS
2842:
2843: %lt=&Apache::lonlocal::texthash(
2844: 'sap' => "Select All Published",
2845: 'uap' => "Unselect All Published");
2846: if ($helper->{VARS}->{'construction'}) {
2847: $buttons .= <<BUTTONS;
2848: <input type="button" onclick="checkallclass(true, 'Published')" value="$lt{'sap'}" />
2849: <input type="button" onclick="checkallclass(false, 'Published')" value="$lt{'uap'}" />
2850: <br />
2851: BUTTONS
2852: }
2853: }
2854:
2855: # Get the list of files in this directory.
2856: my @fileList;
2857:
2858: # If the subdirectory is in local CSTR space
2859: my $metadir;
2860: if ($subdir =~ m|/home/([^/]+)/public_html/(.*)|) {
2861: my ($user,$domain)=
2862: &Apache::loncacc::constructaccess($subdir,
2863: $Apache::lonnet::perlvar{'lonDefDomain'});
2864: $metadir='/res/'.$domain.'/'.$user.'/'.$2;
2865: @fileList = &Apache::lonnet::dirlist($subdir,$domain,$user,undef,undef,'/');
2866: } elsif ($subdir =~ m|^~([^/]+)/(.*)$|) {
2867: $subdir='/home/'.$1.'/public_html/'.$2;
2868: my ($user,$domain)=
2869: &Apache::loncacc::constructaccess($subdir,
2870: $Apache::lonnet::perlvar{'lonDefDomain'});
2871: $metadir='/res/'.$domain.'/'.$user.'/'.$2;
2872: @fileList = &Apache::lonnet::dirlist($subdir,$domain,$user,undef,undef,'/');
2873: } else {
2874: # local library server resource space
2875: @fileList = &Apache::lonnet::dirlist($subdir,$env{'user.domain'},$env{'user.name'},undef,undef,'/');
2876: }
2877:
2878: # Sort the fileList into order
2879: @fileList = sort {lc($a) cmp lc($b)} @fileList;
2880:
2881: $result .= $buttons;
2882:
2883: if (defined $self->{ERROR_MSG}) {
2884: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
2885: }
2886:
2887: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
2888:
2889: # Keeps track if there are no choices, prints appropriate error
2890: # if there are none.
2891: my $choices = 0;
2892: # Print each legitimate file choice.
2893: for my $file (@fileList) {
2894: $file = (split(/&/, $file))[0];
2895: if ($file eq '.' || $file eq '..') {
2896: next;
2897: }
2898: my $fileName = $subdir .'/'. $file;
2899: if (&$filterFunc($file)) {
2900: my $status;
2901: my $color;
2902: if ($helper->{VARS}->{'construction'}) {
2903: ($status, $color) = @{fileState($subdir, $file)};
2904: } else {
2905: $status = '';
2906: $color = '';
2907: }
2908:
2909: # Get the title
2910: my $title = Apache::lonpubdir::getTitleString(($metadir?$metadir:$subdir) .'/'. $file);
2911:
2912: # Netscape 4 is stupid and there's nowhere to put the
2913: # information on the input tag that the file is Published,
2914: # Unpublished, etc. In *real* browsers we can just say
2915: # "class='Published'" and check the className attribute of
2916: # the input tag, but Netscape 4 is too stupid to understand
2917: # that attribute, and un-comprehended attributes are not
2918: # reflected into the object model. So instead, what I do
2919: # is either have or don't have an "onclick" handler that
2920: # does nothing, give Published files the onclick handler, and
2921: # have the checker scripts check for that. Stupid and clumsy,
2922: # and only gives us binary "yes/no" information (at least I
2923: # couldn't figure out how to reach into the event handler's
2924: # actual code to retreive a value), but it works well enough
2925: # here.
2926:
2927: my $onclick = '';
2928: if ($status eq 'Published' && $helper->{VARS}->{'construction'}) {
2929: $onclick = 'onclick="a=1" ';
2930: }
2931: my $id = &new_id();
2932: $result .= '<tr><td align="right"' . " bgcolor='$color'>" .
2933: "<input $onclick type='$type' name='" . $var
2934: . "_forminput' ".qq{id="$id"}." value='" . HTML::Entities::encode($fileName,"<>&\"'").
2935: "'";
2936: if (!$self->{'multichoice'} && $choices == 0) {
2937: $result .= ' checked="checked"';
2938: }
2939: $result .= "/></td><td bgcolor='$color'>".
2940: qq{<label for="$id">}. $file . "</label></td>" .
2941: "<td bgcolor='$color'>$title</td>" .
2942: "<td bgcolor='$color'>$status</td>" . "</tr>\n";
2943: $choices++;
2944: }
2945: }
2946:
2947: $result .= "</table>\n";
2948:
2949: if (!$choices) {
2950: $result .= '<font color="#FF0000">There are no files available to select in this directory ('.$subdir.'). Please go back and select another option.</font><br /><br />';
2951: }
2952:
2953: $result .= $buttons;
2954:
2955: return $result;
2956: }
2957:
2958: # Determine the state of the file: Published, unpublished, modified.
2959: # Return the color it should be in and a label as a two-element array
2960: # reference.
2961: # Logic lifted from lonpubdir.pm, even though I don't know that it's still
2962: # the most right thing to do.
2963:
2964: sub fileState {
2965: my $constructionSpaceDir = shift;
2966: my $file = shift;
2967:
2968: my ($uname,$udom)=($env{'user.name'},$env{'user.domain'});
2969: if ($env{'request.role'}=~/^ca\./) {
2970: (undef,$udom,$uname)=split(/\//,$env{'request.role'});
2971: }
2972: my $docroot = $Apache::lonnet::perlvar{'lonDocRoot'};
2973: my $subdirpart = $constructionSpaceDir;
2974: $subdirpart =~ s/^\/home\/$uname\/public_html//;
2975: my $resdir = $docroot . '/res/' . $udom . '/' . $uname .
2976: $subdirpart;
2977:
2978: my @constructionSpaceFileStat = stat($constructionSpaceDir . '/' . $file);
2979: my @resourceSpaceFileStat = stat($resdir . '/' . $file);
2980: if (!@resourceSpaceFileStat) {
2981: return ['Unpublished', '#FFCCCC'];
2982: }
2983:
2984: my $constructionSpaceFileModified = $constructionSpaceFileStat[9];
2985: my $resourceSpaceFileModified = $resourceSpaceFileStat[9];
2986:
2987: if ($constructionSpaceFileModified > $resourceSpaceFileModified) {
2988: return ['Modified', '#FFFFCC'];
2989: }
2990: return ['Published', '#CCFFCC'];
2991: }
2992:
2993: sub postprocess {
2994: my $self = shift;
2995: my $result = $env{'form.' . $self->{'variable'} . '_forminput'};
2996: if (!$result) {
2997: $self->{ERROR_MSG} = 'You must choose at least one file '.
2998: 'to continue.';
2999: return 0;
3000: }
3001:
3002: if (defined($self->{NEXTSTATE})) {
3003: $helper->changeState($self->{NEXTSTATE});
3004: }
3005:
3006: return 1;
3007: }
3008:
3009: 1;
3010:
3011: package Apache::lonhelper::section;
3012:
3013: =pod
3014:
3015: =head2 Element: sectionX<section, helper element>
3016:
3017: <section> allows the user to choose one or more sections from the current
3018: course.
3019:
3020: It takes the standard attributes "variable", "multichoice",
3021: "allowempty" and "nextstate", meaning what they do for most other
3022: elements.
3023:
3024: also takes a boolean 'onlysections' whcih will restrict this to only
3025: have sections and not include groups
3026:
3027: =cut
3028:
3029: no strict;
3030: @ISA = ("Apache::lonhelper::choices");
3031: use strict;
3032:
3033: BEGIN {
3034: &Apache::lonhelper::register('Apache::lonhelper::section',
3035: ('section'));
3036: }
3037:
3038: sub new {
3039: my $ref = Apache::lonhelper::choices->new();
3040: bless($ref);
3041: }
3042:
3043: sub start_section {
3044: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3045:
3046: if ($target ne 'helper') {
3047: return '';
3048: }
3049:
3050: $paramHash->{CHOICES} = [];
3051:
3052: $paramHash->{'variable'} = $token->[2]{'variable'};
3053: $helper->declareVar($paramHash->{'variable'});
3054: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
3055: $paramHash->{'allowempty'} = $token->[2]{'allowempty'};
3056: if (defined($token->[2]{'nextstate'})) {
3057: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
3058: }
3059:
3060: # Populate the CHOICES element
3061: my %choices;
3062:
3063: my $section = Apache::loncoursedata::CL_SECTION();
3064: my $classlist = Apache::loncoursedata::get_classlist();
3065: foreach my $user (keys(%$classlist)) {
3066: my $section_name = $classlist->{$user}[$section];
3067: if (!$section_name) {
3068: $choices{"No section assigned"} = "";
3069: } else {
3070: $choices{$section_name} = $section_name;
3071: }
3072: }
3073:
3074: if (exists($choices{"No section assigned"})) {
3075: push(@{$paramHash->{CHOICES}},
3076: ['No section assigned','No section assigned']);
3077: delete($choices{"No section assigned"});
3078: }
3079: for my $section_name (sort {lc($a) cmp lc($b) } (keys(%choices))) {
3080: push @{$paramHash->{CHOICES}}, [$section_name, $section_name];
3081: }
3082: return if ($token->[2]{'onlysections'});
3083:
3084: # add in groups to the end of the list
3085: my %curr_groups = &Apache::longroup::coursegroups();
3086: foreach my $group_name (sort(keys(%curr_groups))) {
3087: push(@{$paramHash->{CHOICES}}, [$group_name, $group_name]);
3088: }
3089: }
3090:
3091: sub end_section {
3092: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3093:
3094: if ($target ne 'helper') {
3095: return '';
3096: }
3097: Apache::lonhelper::section->new();
3098: }
3099: 1;
3100:
3101: package Apache::lonhelper::group;
3102:
3103: =pod
3104:
3105: =head2 Element: groupX<group, helper element>
3106:
3107: <group> allows the user to choose one or more groups from the current course.
3108:
3109: It takes the standard attributes "variable", "multichoice",
3110: "allowempty" and "nextstate", meaning what they do for most other
3111: elements.
3112:
3113: =cut
3114:
3115: no strict;
3116: @ISA = ("Apache::lonhelper::choices");
3117: use strict;
3118:
3119: BEGIN {
3120: &Apache::lonhelper::register('Apache::lonhelper::group',
3121: ('group'));
3122: }
3123:
3124: sub new {
3125: my $ref = Apache::lonhelper::choices->new();
3126: bless($ref);
3127: }
3128:
3129: sub start_group {
3130: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3131:
3132: if ($target ne 'helper') {
3133: return '';
3134: }
3135:
3136: $paramHash->{CHOICES} = [];
3137:
3138: $paramHash->{'variable'} = $token->[2]{'variable'};
3139: $helper->declareVar($paramHash->{'variable'});
3140: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
3141: $paramHash->{'allowempty'} = $token->[2]{'allowempty'};
3142: if (defined($token->[2]{'nextstate'})) {
3143: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
3144: }
3145:
3146: # Populate the CHOICES element
3147: my %choices;
3148:
3149: my %curr_groups = &Apache::longroup::coursegroups();
3150: foreach my $group_name (sort {lc($a) cmp lc($b)} (keys(%curr_groups))) {
3151: push(@{$paramHash->{CHOICES}}, [$group_name, $group_name]);
3152: }
3153: }
3154:
3155: sub end_group {
3156: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3157:
3158: if ($target ne 'helper') {
3159: return '';
3160: }
3161: Apache::lonhelper::group->new();
3162: }
3163: 1;
3164:
3165: package Apache::lonhelper::string;
3166:
3167: =pod
3168:
3169: =head2 Element: stringX<string, helper element>
3170:
3171: string elements provide a string entry field for the user. string elements
3172: take the usual 'variable' and 'nextstate' parameters. string elements
3173: also pass through 'maxlength' and 'size' attributes to the input tag.
3174:
3175: string honors the defaultvalue tag, if given.
3176:
3177: string honors the validation function, if given.
3178:
3179: =cut
3180:
3181: no strict;
3182: @ISA = ("Apache::lonhelper::element");
3183: use strict;
3184: use Apache::lonlocal;
3185:
3186: BEGIN {
3187: &Apache::lonhelper::register('Apache::lonhelper::string',
3188: ('string'));
3189: }
3190:
3191: sub new {
3192: my $ref = Apache::lonhelper::element->new();
3193: bless($ref);
3194: }
3195:
3196: # CONSTRUCTION: Construct the message element from the XML
3197: sub start_string {
3198: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3199:
3200: if ($target ne 'helper') {
3201: return '';
3202: }
3203:
3204: $paramHash->{'variable'} = $token->[2]{'variable'};
3205: $helper->declareVar($paramHash->{'variable'});
3206: $paramHash->{'nextstate'} = $token->[2]{'nextstate'};
3207: $paramHash->{'maxlength'} = $token->[2]{'maxlength'};
3208: $paramHash->{'size'} = $token->[2]{'size'};
3209:
3210: return '';
3211: }
3212:
3213: sub end_string {
3214: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3215:
3216: if ($target ne 'helper') {
3217: return '';
3218: }
3219: Apache::lonhelper::string->new();
3220: return '';
3221: }
3222:
3223: sub render {
3224: my $self = shift;
3225: my $result = '';
3226:
3227: if (defined $self->{ERROR_MSG}) {
3228: $result .= '<p><font color="#FF0000">' . $self->{ERROR_MSG} . '</font></p>';
3229: }
3230:
3231: $result .= '<input type="string" name="' . $self->{'variable'} . '_forminput"';
3232:
3233: if (defined($self->{'size'})) {
3234: $result .= ' size="' . $self->{'size'} . '"';
3235: }
3236: if (defined($self->{'maxlength'})) {
3237: $result .= ' maxlength="' . $self->{'maxlength'} . '"';
3238: }
3239:
3240: if (defined($self->{DEFAULT_VALUE})) {
3241: my $valueFunc = eval($self->{DEFAULT_VALUE});
3242: die 'Error in default value code for variable ' .
3243: $self->{'variable'} . ', Perl said: ' . $@ if $@;
3244: $result .= ' value="' . &$valueFunc($helper, $self) . '"';
3245: }
3246:
3247: $result .= ' />';
3248:
3249: return $result;
3250: }
3251:
3252: # If a NEXTSTATE was given, switch to it
3253: sub postprocess {
3254: my $self = shift;
3255:
3256: if (defined($self->{VALIDATOR})) {
3257: my $validator = eval($self->{VALIDATOR});
3258: die 'Died during evaluation of validator code; Perl said: ' . $@ if $@;
3259: my $invalid = &$validator($helper, $state, $self, $self->getValue());
3260: if ($invalid) {
3261: $self->{ERROR_MSG} = $invalid;
3262: return 0;
3263: }
3264: }
3265:
3266: if (defined($self->{'nextstate'})) {
3267: $helper->changeState($self->{'nextstate'});
3268: }
3269:
3270: return 1;
3271: }
3272:
3273: 1;
3274:
3275: package Apache::lonhelper::general;
3276:
3277: =pod
3278:
3279: =head2 General-purpose tag: <exec>X<exec, helper tag>
3280:
3281: The contents of the exec tag are executed as Perl code, B<not> inside a
3282: safe space, so the full range of $env and such is available. The code
3283: will be executed as a subroutine wrapped with the following code:
3284:
3285: "sub { my $helper = shift; my $state = shift;" and
3286:
3287: "}"
3288:
3289: The return value is ignored.
3290:
3291: $helper is the helper object. Feel free to add methods to the helper
3292: object to support whatever manipulation you may need to do (for instance,
3293: overriding the form location if the state is the final state; see
3294: parameter.helper for an example).
3295:
3296: $state is the $paramHash that has currently been generated and may
3297: be manipulated by the code in exec. Note that the $state is not yet
3298: an actual state B<object>, it is just a hash, so do not expect to
3299: be able to call methods on it.
3300:
3301: =cut
3302:
3303: use Apache::lonlocal;
3304: use Apache::lonnet;
3305:
3306: BEGIN {
3307: &Apache::lonhelper::register('Apache::lonhelper::general',
3308: 'exec', 'condition', 'clause',
3309: 'eval');
3310: }
3311:
3312: sub start_exec {
3313: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3314:
3315: if ($target ne 'helper') {
3316: return '';
3317: }
3318:
3319: my $code = &Apache::lonxml::get_all_text('/exec', $parser);
3320:
3321: $code = eval ('sub { my $helper = shift; my $state = shift; ' .
3322: $code . "}");
3323: die 'Error in <exec>, Perl said: '. $@ if $@;
3324: &$code($helper, $paramHash);
3325: }
3326:
3327: sub end_exec { return ''; }
3328:
3329: =pod
3330:
3331: =head2 General-purpose tag: <condition>
3332:
3333: The <condition> tag allows you to mask out parts of the helper code
3334: depending on some programatically determined condition. The condition
3335: tag contains a tag <clause> which contains perl code that when wrapped
3336: with "sub { my $helper = shift; my $state = shift; " and "}", returns
3337: a true value if the XML in the condition should be evaluated as a normal
3338: part of the helper, or false if it should be completely discarded.
3339:
3340: The <clause> tag must be the first sub-tag of the <condition> tag or
3341: it will not work as expected.
3342:
3343: =cut
3344:
3345: # The condition tag just functions as a marker, it doesn't have
3346: # to "do" anything. Technically it doesn't even have to be registered
3347: # with the lonxml code, but I leave this here to be explicit about it.
3348: sub start_condition { return ''; }
3349: sub end_condition { return ''; }
3350:
3351: sub start_clause {
3352: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3353:
3354: if ($target ne 'helper') {
3355: return '';
3356: }
3357:
3358: my $clause = Apache::lonxml::get_all_text('/clause', $parser);
3359: $clause = eval('sub { my $helper = shift; my $state = shift; '
3360: . $clause . '}');
3361: die 'Error in clause of condition, Perl said: ' . $@ if $@;
3362: if (!&$clause($helper, $paramHash)) {
3363: # Discard all text until the /condition.
3364: my $end_tag = $paramHash->{SKIPTAG} || '/condition';
3365: &Apache::lonxml::get_all_text($end_tag, $parser);
3366: }
3367: }
3368:
3369: sub end_clause { return ''; }
3370:
3371: =pod
3372:
3373: =head2 General-purpose tag: <eval>X<eval, helper tag>
3374:
3375: The <eval> tag will be evaluated as a subroutine call passed in the
3376: current helper object and state hash as described in <condition> above,
3377: but is expected to return a string to be printed directly to the
3378: screen. This is useful for dynamically generating messages.
3379:
3380: =cut
3381:
3382: # This is basically a type of message.
3383: # Programmatically setting $paramHash->{NEXTSTATE} would work, though
3384: # it's probably bad form.
3385:
3386: sub start_eval {
3387: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3388:
3389: if ($target ne 'helper') {
3390: return '';
3391: }
3392:
3393: my $program = Apache::lonxml::get_all_text('/eval', $parser);
3394: $program = eval('sub { my $helper = shift; my $state = shift; '
3395: . $program . '}');
3396: die 'Error in eval code, Perl said: ' . $@ if $@;
3397: $paramHash->{MESSAGE_TEXT} = &$program($helper, $paramHash);
3398: }
3399:
3400: sub end_eval {
3401: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3402:
3403: if ($target ne 'helper') {
3404: return '';
3405: }
3406:
3407: Apache::lonhelper::message->new();
3408: }
3409:
3410: 1;
3411:
3412: package Apache::lonhelper::final;
3413:
3414: =pod
3415:
3416: =head2 Element: finalX<final, helper tag>
3417:
3418: <final> is a special element that works with helpers that use the <finalcode>
3419: tagX<finalcode, helper tag>. It goes through all the states and elements, executing the <finalcode>
3420: snippets and collecting the results. Finally, it takes the user out of the
3421: helper, going to a provided page.
3422:
3423: If the parameter "restartCourse" is true, this will override the buttons and
3424: will make a "Finish Helper" button that will re-initialize the course for them,
3425: which is useful for the Course Initialization helper so the users never see
3426: the old values taking effect.
3427:
3428: If the parameter "restartCourse" is not true a 'Finish' Button will be
3429: presented that takes the user back to whatever was defined as <exitpage>
3430:
3431: =cut
3432:
3433: no strict;
3434: @ISA = ("Apache::lonhelper::element");
3435: use strict;
3436: use Apache::lonlocal;
3437: use Apache::lonnet;
3438: BEGIN {
3439: &Apache::lonhelper::register('Apache::lonhelper::final',
3440: ('final', 'exitpage'));
3441: }
3442:
3443: sub new {
3444: my $ref = Apache::lonhelper::element->new();
3445: bless($ref);
3446: }
3447:
3448: sub start_final {
3449: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3450:
3451: if ($target ne 'helper') {
3452: return '';
3453: }
3454:
3455: $paramHash->{'restartCourse'} = $token->[2]{'restartCourse'};
3456:
3457: return '';
3458: }
3459:
3460: sub end_final {
3461: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3462:
3463: if ($target ne 'helper') {
3464: return '';
3465: }
3466:
3467: Apache::lonhelper::final->new();
3468:
3469: return '';
3470: }
3471:
3472: sub start_exitpage {
3473: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3474:
3475: if ($target ne 'helper') {
3476: return '';
3477: }
3478:
3479: $paramHash->{EXIT_PAGE} = &Apache::lonxml::get_all_text('/exitpage',
3480: $parser);
3481:
3482: return '';
3483: }
3484:
3485: sub end_exitpage { return ''; }
3486:
3487: sub render {
3488: my $self = shift;
3489:
3490: my @results;
3491:
3492: # Collect all the results
3493: for my $stateName (keys %{$helper->{STATES}}) {
3494: my $state = $helper->{STATES}->{$stateName};
3495:
3496: for my $element (@{$state->{ELEMENTS}}) {
3497: if (defined($element->{FINAL_CODE})) {
3498: # Compile the code.
3499: my $code = 'sub { my $helper = shift; my $element = shift; '
3500: . $element->{FINAL_CODE} . '}';
3501: $code = eval($code);
3502: die 'Error while executing final code for element with var ' .
3503: $element->{'variable'} . ', Perl said: ' . $@ if $@;
3504:
3505: my $result = &$code($helper, $element);
3506: if ($result) {
3507: push @results, $result;
3508: }
3509: }
3510: }
3511: }
3512:
3513: my $result;
3514:
3515: if (scalar(@results) != 0) {
3516: $result .= "<ul>\n";
3517: for my $re (@results) {
3518: $result .= ' <li>' . $re . "</li>\n";
3519: }
3520:
3521: if (!@results) {
3522: $result .= ' <li>' .
3523: &mt('No changes were made to current settings.') . '</li>';
3524: }
3525:
3526: $result .= '</ul>';
3527: }
3528:
3529: my $actionURL = $self->{EXIT_PAGE};
3530: my $targetURL = '';
3531: my $finish=&mt('Finish');
3532: if ($self->{'restartCourse'}) {
3533: $actionURL = '/adm/roles';
3534: $targetURL = '/adm/menu';
3535: if ($env{'course.'.$env{'request.course.id'}.'.url'}=~/^uploaded/) {
3536: $targetURL = '/adm/coursedocs';
3537: } else {
3538: $targetURL = '/adm/navmaps';
3539: }
3540: if ($env{'course.'.$env{'request.course.id'}.'.clonedfrom'}) {
3541: $targetURL = '/adm/parmset?overview=1';
3542: }
3543: my $finish=&mt('Finish Course Initialization');
3544: }
3545: my $previous = HTML::Entities::encode(&mt("<- Previous"), '<>&"');
3546: my $next = HTML::Entities::encode(&mt("Next ->"), '<>&"');
3547: my $target = " target='loncapaclient'";
3548: if (($env{'browser.interface'} eq 'textual') ||
3549: ($env{'environment.remote'} eq 'off')) { $target=''; }
3550: $result .= "<center>\n" .
3551: "<form action='".$actionURL."' method='post' $target>\n" .
3552: "<input type='button' onclick='history.go(-1)' value='$previous' />" .
3553: "<input type='hidden' name='orgurl' value='$targetURL' />" .
3554: "<input type='hidden' name='selectrole' value='1' />\n" .
3555: "<input type='hidden' name='" . $env{'request.role'} .
3556: "' value='1' />\n<input type='submit' value='" . $finish . "' />\n" .
3557: "</form></center>";
3558:
3559: return $result;
3560: }
3561:
3562: sub overrideForm {
3563: return 1;
3564: }
3565:
3566: 1;
3567:
3568: package Apache::lonhelper::parmwizfinal;
3569:
3570: # This is the final state for the parm helper. It is not generally useful,
3571: # so it is not perldoc'ed. It does its own processing.
3572: # It is represented with <parmwizfinal />, and
3573: # should later be moved to lonparmset.pm .
3574:
3575: no strict;
3576: @ISA = ('Apache::lonhelper::element');
3577: use strict;
3578: use Apache::lonlocal;
3579: use Apache::lonnet;
3580:
3581: BEGIN {
3582: &Apache::lonhelper::register('Apache::lonhelper::parmwizfinal',
3583: ('parmwizfinal'));
3584: }
3585:
3586: use Time::localtime;
3587:
3588: sub new {
3589: my $ref = Apache::lonhelper::choices->new();
3590: bless ($ref);
3591: }
3592:
3593: sub start_parmwizfinal { return ''; }
3594:
3595: sub end_parmwizfinal {
3596: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3597:
3598: if ($target ne 'helper') {
3599: return '';
3600: }
3601: Apache::lonhelper::parmwizfinal->new();
3602: }
3603:
3604: # Renders a form that, when submitted, will form the input to lonparmset.pm
3605: sub render {
3606: my $self = shift;
3607: my $vars = $helper->{VARS};
3608:
3609: # FIXME: Unify my designators with the standard ones
3610: my %dateTypeHash = ('open_date' => "opening date",
3611: 'due_date' => "due date",
3612: 'answer_date' => "answer date",
3613: 'tries' => 'number of tries',
3614: 'weight' => 'problem weight'
3615: );
3616: my %parmTypeHash = ('open_date' => "0_opendate",
3617: 'due_date' => "0_duedate",
3618: 'answer_date' => "0_answerdate",
3619: 'tries' => '0_maxtries',
3620: 'weight' => '0_weight' );
3621: my %realParmName = ('open_date' => "opendate",
3622: 'due_date' => "duedate",
3623: 'answer_date' => "answerdate",
3624: 'tries' => 'maxtries',
3625: 'weight' => 'weight' );
3626:
3627: my $affectedResourceId = "";
3628: my $parm_name = $parmTypeHash{$vars->{ACTION_TYPE}};
3629: my $level = "";
3630: my $resourceString;
3631: my $symb;
3632: my $paramlevel;
3633:
3634: # Print the granularity, depending on the action
3635: if ($vars->{GRANULARITY} eq 'whole_course') {
3636: $resourceString .= '<li>'.&mt('for <b>all resources in the course</b>').'</li>';
3637: if ($vars->{TARGETS} eq 'course') {
3638: $level = 14; # general course, see lonparmset.pm perldoc
3639: } elsif ($vars->{TARGETS} eq 'section') {
3640: $level = 9;
3641: } elsif ($vars->{TARGETS} eq 'group') {
3642: $level = 6;
3643: } else {
3644: $level = 3;
3645: }
3646: $affectedResourceId = "0.0";
3647: $symb = 'a';
3648: $paramlevel = 'general';
3649: } elsif ($vars->{GRANULARITY} eq 'map') {
3650: my $navmap = Apache::lonnavmaps::navmap->new();
3651: if (defined($navmap)) {
3652: my $res = $navmap->getByMapPc($vars->{RESOURCE_ID});
3653: my $title = $res->compTitle();
3654: $symb = $res->symb();
3655: $resourceString .= '<li>'.&mt('for the map named [_1]',"<b>$title</b>").'</li>';
3656: } else {
3657: $resourceString .= '<li>'.&mt('for the map ID [_1] (name unavailable)','<b>'.$vars->{RESOURCE_ID}.'</b>').'</li>';
3658: &Apache::lonnet::logthis('Retrieval of map title failed in lonhelper.pm - could not create navmap object for course.');
3659:
3660: }
3661: if ($vars->{TARGETS} eq 'course') {
3662: $level = 13; # general course, see lonparmset.pm perldoc
3663: } elsif ($vars->{TARGETS} eq 'section') {
3664: $level = 8;
3665: } elsif ($vars->{TARGETS} eq 'group') {
3666: $level = 5;
3667: } else {
3668: $level = 2;
3669: }
3670: $affectedResourceId = $vars->{RESOURCE_ID};
3671: $paramlevel = 'map';
3672: } else {
3673: my $part = $vars->{RESOURCE_ID_part};
3674: if ($part ne 'All Parts' && $part) { $parm_name=~s/^0/$part/; } else { $part=&mt('All Parts'); }
3675: my $navmap = Apache::lonnavmaps::navmap->new();
3676: if (defined($navmap)) {
3677: my $res = $navmap->getById($vars->{RESOURCE_ID});
3678: $symb = $res->symb();
3679: my $title = $res->compTitle();
3680: $resourceString .= '<li>'.&mt('for the resource named [_1] part [_2]',"<b>$title</b>","<b>$part</b>").'</li>';
3681: } else {
3682: $resourceString .= '<li>'.&mt('for the resource ID [_1] (name unavailable) part [_2]','<b>'.$vars->{RESOURCE_ID}.'</b>',"<b>$part</b>").'</li>';
3683: &Apache::lonnet::logthis('Retrieval of resource title failed in lonhelper.pm - could not create navmap object for course.');
3684: }
3685: if ($vars->{TARGETS} eq 'course') {
3686: $level = 10; # general course, see lonparmset.pm perldoc
3687: } elsif ($vars->{TARGETS} eq 'section') {
3688: $level = 7;
3689: } elsif ($vars->{TARGETS} eq 'group') {
3690: $level = 4;
3691: } else {
3692: $level = 1;
3693: }
3694: $affectedResourceId = $vars->{RESOURCE_ID};
3695: $paramlevel = 'full';
3696: }
3697:
3698: my $result = "<form name='helpform' method='POST' action='/adm/parmset#$affectedResourceId&$parm_name&$level'>\n";
3699: $result .= "<input type='hidden' name='action' value='settable' />\n";
3700: $result .= "<input type='hidden' name='dis' value='helper' />\n";
3701: $result .= "<input type='hidden' name='pscat' value='".
3702: $realParmName{$vars->{ACTION_TYPE}}."' />\n";
3703: if ($vars->{GRANULARITY} eq 'resource') {
3704: $result .= "<input type='hidden' name='symb' value='".
3705: HTML::Entities::encode($symb,"'<>&\"") . "' />\n";
3706: } elsif ($vars->{GRANULARITY} eq 'map') {
3707: $result .= "<input type='hidden' name='pschp' value='".
3708: $affectedResourceId."' />\n";
3709: }
3710: my $part = $vars->{RESOURCE_ID_part};
3711: if ($part eq 'All Parts' || !$part) { $part=0; }
3712: $result .= "<input type='hidden' name='psprt' value='".
3713: HTML::Entities::encode($part,"'<>&\"") . "' />\n";
3714:
3715: $result .= '<p>'.&mt('Confirm that this information is correct, then click "Finish Helper" to complete setting the parameter.').'<ul>';
3716:
3717: # Print the type of manipulation:
3718: my $extra;
3719: if ($vars->{ACTION_TYPE} eq 'tries') {
3720: $extra = $vars->{TRIES};
3721: }
3722: if ($vars->{ACTION_TYPE} eq 'weight') {
3723: $extra = $vars->{WEIGHT};
3724: }
3725: $result .= "<li>";
3726: my $what = &mt($dateTypeHash{$vars->{ACTION_TYPE}});
3727: if ($extra) {
3728: $result .= &mt('Setting the [_1] to [_2]',"<b>$what</b>",$extra);
3729: } else {
3730: $result .= &mt('Setting the [_1]',"<b>$what</b>");
3731: }
3732: $result .= "</li>\n";
3733: if ($vars->{ACTION_TYPE} eq 'due_date' ||
3734: $vars->{ACTION_TYPE} eq 'answer_date') {
3735: # for due dates, we default to "date end" type entries
3736: $result .= "<input type='hidden' name='recent_date_end' " .
3737: "value='" . $vars->{PARM_DATE} . "' />\n";
3738: $result .= "<input type='hidden' name='pres_value' " .
3739: "value='" . $vars->{PARM_DATE} . "' />\n";
3740: $result .= "<input type='hidden' name='pres_type' " .
3741: "value='date_end' />\n";
3742: } elsif ($vars->{ACTION_TYPE} eq 'open_date') {
3743: $result .= "<input type='hidden' name='recent_date_start' ".
3744: "value='" . $vars->{PARM_DATE} . "' />\n";
3745: $result .= "<input type='hidden' name='pres_value' " .
3746: "value='" . $vars->{PARM_DATE} . "' />\n";
3747: $result .= "<input type='hidden' name='pres_type' " .
3748: "value='date_start' />\n";
3749: } elsif ($vars->{ACTION_TYPE} eq 'tries') {
3750: $result .= "<input type='hidden' name='pres_value' " .
3751: "value='" . $vars->{TRIES} . "' />\n";
3752: $result .= "<input type='hidden' name='pres_type' " .
3753: "value='int_pos' />\n";
3754: } elsif ($vars->{ACTION_TYPE} eq 'weight') {
3755: $result .= "<input type='hidden' name='pres_value' " .
3756: "value='" . $vars->{WEIGHT} . "' />\n";
3757: }
3758:
3759: $result .= $resourceString;
3760:
3761: # Print targets
3762: if ($vars->{TARGETS} eq 'course') {
3763: $result .= '<li>'.&mt('for <b>all students in course</b>').'</li>';
3764: } elsif ($vars->{TARGETS} eq 'section') {
3765: my $section = $vars->{SECTION_NAME};
3766: $result .= '<li>'.&mt('for section [_1]',"<b>$section</b>").'</li>';
3767: $result .= "<input type='hidden' name='csec' value='" .
3768: HTML::Entities::encode($section,"'<>&\"") . "' />\n";
3769: } elsif ($vars->{TARGETS} eq 'group') {
3770: my $group = $vars->{GROUP_NAME};
3771: $result .= '<li>'.&mt('for group [_1]',"<b>$group</b>").'</li>';
3772: $result .= "<input type='hidden' name='cgroup' value='" .
3773: HTML::Entities::encode($group,"'<>&\"") . "' />\n";
3774: } else {
3775: # FIXME: This is probably wasteful! Store the name!
3776: my $classlist = Apache::loncoursedata::get_classlist();
3777: my ($uname,$udom)=split(':',$vars->{USER_NAME});
3778: my $name = $classlist->{$uname.':'.$udom}->[6];
3779: $result .= '<li>'.&mt('for [_1]',"<b>$name</b>").'</li>';
3780: $result .= "<input type='hidden' name='uname' value='".
3781: HTML::Entities::encode($uname,"'<>&\"") . "' />\n";
3782: $result .= "<input type='hidden' name='udom' value='".
3783: HTML::Entities::encode($udom,"'<>&\"") . "' />\n";
3784: }
3785:
3786: # Print value
3787: if ($vars->{ACTION_TYPE} ne 'tries' && $vars->{ACTION_TYPE} ne 'weight') {
3788: my $showdate = &Apache::lonlocal::locallocaltime($vars->{PARM_DATE});
3789: $result .= '<li>'.&mt('to [_1] ([_2])',"<b>".$showdate."</b>",Apache::lonnavmaps::timeToHumanString($vars->{PARM_DATE}))."</li>\n";
3790: }
3791:
3792: # print pres_marker
3793: $result .= "\n<input type='hidden' name='pres_marker'" .
3794: " value='$affectedResourceId&$parm_name&$level' />\n";
3795:
3796: # Make the table appear
3797: $result .= "\n<input type='hidden' value='true' name='prevvisit' />";
3798: $result .= "\n<input type='hidden' value='$symb' name='pssymb' />";
3799: $result .= "\n<input type='hidden' value='$paramlevel' name='parmlev' />";
3800:
3801: $result .= "<br /><br /><center><input type='submit' value='".&mt('Finish Helper')."' /></center></form>\n";
3802:
3803: return $result;
3804: }
3805:
3806: sub overrideForm {
3807: return 1;
3808: }
3809:
3810: 1;
3811:
3812: __END__
3813:
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