1: # The LearningOnline Network with CAPA
2: # .helper XML handler to implement the LON-CAPA helper
3: #
4: # $Id: lonhelper.pm,v 1.150 2006/05/16 20:45:26 albertel 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: =head2 Example Helper Skeleton
85:
86: An example of the tags so far:
87:
88: <helper title="Example Helper">
89: <state name="START" title="Demonstrating the Example Helper">
90: <!-- notice this is the START state the wizard requires -->
91: </state>
92: <state name="GET_NAME" title="Enter Student Name">
93: </state>
94: </helper>
95:
96: Of course this does nothing. In order for the wizard to do something, it is
97: necessary to put actual elements into the wizard. Documentation for each
98: of these elements follows.
99:
100: =head1 Creating a Helper With Code, Not XML
101:
102: In some situations, such as the printing wizard (see lonprintout.pm),
103: writing the helper in XML would be too complicated, because of scope
104: issues or the fact that the code actually outweighs the XML. It is
105: possible to create a helper via code, though it is a little odd.
106:
107: Creating a helper via code is more like issuing commands to create
108: a helper then normal code writing. For instance, elements will automatically
109: be added to the last state created, so it's important to create the
110: states in the correct order.
111:
112: First, create a new helper:
113:
114: use Apache::lonhelper;
115:
116: my $helper = Apache::lonhelper::new->("Helper Title");
117:
118: Next you'll need to manually add states to the helper:
119:
120: Apache::lonhelper::state->new("STATE_NAME", "State's Human Title");
121:
122: You don't need to save a reference to it because all elements up until
123: the next state creation will automatically be added to this state.
124:
125: Elements are created by populating the $paramHash in
126: Apache::lonhelper::paramhash. To prevent namespace issues, retrieve
127: a reference to that has with getParamHash:
128:
129: my $paramHash = Apache::lonhelper::getParamHash();
130:
131: You will need to do this for each state you create.
132:
133: Populate the $paramHash with the parameters for the element you wish
134: to add next; the easiest way to find out what those entries are is
135: to read the code. Some common ones are 'variable' to record the variable
136: to store the results in, and NEXTSTATE to record a next state transition.
137:
138: Then create your element:
139:
140: $paramHash->{MESSAGETEXT} = "This is a message.";
141: Apache::lonhelper::message->new();
142:
143: The creation will take the $paramHash and bless it into a
144: Apache::lonhelper::message object. To create the next element, you need
145: to get a reference to the new, empty $paramHash:
146:
147: $paramHash = Apache::lonhelper::getParamHash();
148:
149: and you can repeat creating elements that way. You can add states
150: and elements as needed.
151:
152: See lonprintout.pm, subroutine printHelper for an example of this, where
153: we dynamically add some states to prevent security problems, for instance.
154:
155: Normally the machinery in the XML format is sufficient; dynamically
156: adding states can easily be done by wrapping the state in a <condition>
157: tag. This should only be used when the code dominates the XML content,
158: the code is so complicated that it is difficult to get access to
159: all of the information you need because of scoping issues, or would-be <exec> or
160: <eval> blocks using the {DATA} mechanism results in hard-to-read
161: and -maintain code. (See course.initialization.helper for a borderline
162: case.)
163:
164: It is possible to do some of the work with an XML fragment parsed by
165: lonxml; again, see lonprintout.pm for an example. In that case it is
166: imperative that you call B<Apache::lonhelper::registerHelperTags()>
167: before parsing XML fragments and B<Apache::lonhelper::unregisterHelperTags()>
168: when you are done. See lonprintout.pm for examples of this usage in the
169: printHelper subroutine.
170:
171: =head2 Localization
172:
173: The helper framework tries to handle as much localization as
174: possible. The text is always run through
175: Apache::lonlocal::normalize_string, so be sure to run the keys through
176: that function for maximum usefulness and robustness.
177:
178: =cut
179:
180: package Apache::lonhelper;
181: use Apache::Constants qw(:common);
182: use Apache::File;
183: use Apache::lonxml;
184: use Apache::lonlocal;
185: use Apache::lonnet;
186: use Apache::lonselstudent;
187:
188: # Register all the tags with the helper, so the helper can
189: # push and pop them
190:
191: my @helperTags;
192:
193: sub register {
194: my ($namespace, @tags) = @_;
195:
196: for my $tag (@tags) {
197: push @helperTags, [$namespace, $tag];
198: }
199: }
200:
201: BEGIN {
202: Apache::lonxml::register('Apache::lonhelper',
203: ('helper'));
204: register('Apache::lonhelper', ('state'));
205: }
206:
207: # Since all helpers are only three levels deep (helper tag, state tag,
208: # substate type), it's easier and more readble to explicitly track
209: # those three things directly, rather then futz with the tag stack
210: # every time.
211: my $helper;
212: my $state;
213: my $substate;
214: # To collect parameters, the contents of the subtags are collected
215: # into this paramHash, then passed to the element object when the
216: # end of the element tag is located.
217: my $paramHash;
218:
219: # Note from Jeremy 5-8-2003: It is *vital* that the real handler be called
220: # as a subroutine from the handler, or very mysterious things might happen.
221: # I don't know exactly why, but it seems that the scope where the Apache
222: # server enters the perl handler is treated differently from the rest of
223: # the handler. This also seems to manifest itself in the debugger as entering
224: # the perl handler in seemingly random places (sometimes it starts in the
225: # compiling phase, sometimes in the handler execution phase where it runs
226: # the code and stepping into the "1;" the module ends with goes into the handler,
227: # sometimes starting directly with the handler); I think the cause is related.
228: # In the debugger, this means that breakpoints are ignored until you step into
229: # a function and get out of what must be a "faked up scope" in the Apache->
230: # mod_perl connection. In this code, it was manifesting itself in the existence
231: # of two separate file-scoped $helper variables, one set to the value of the
232: # helper in the helper constructor, and one referenced by the handler on the
233: # "$helper->process()" line. Using the debugger, one could actually
234: # see the two different $helper variables, as hashes at completely
235: # different addresses. The second was therefore never set, and was still
236: # undefined when I tried to call process on it.
237: # By pushing the "real handler" down into the "real scope", everybody except the
238: # actual handler function directly below this comment gets the same $helper and
239: # everybody is happy.
240: # The upshot of all of this is that for safety when a handler is using
241: # file-scoped variables in LON-CAPA, the handler should be pushed down one
242: # call level, as I do here, to ensure that the top-level handler function does
243: # not get a different file scope from the rest of the code.
244: sub handler {
245: my $r = shift;
246: return real_handler($r);
247: }
248:
249: # For debugging purposes, one can send a second parameter into this
250: # function, the 'uri' of the helper you wish to have rendered, and
251: # call this from other handlers.
252: sub real_handler {
253: my $r = shift;
254: my $uri = shift;
255: if (!defined($uri)) { $uri = $r->uri(); }
256: $env{'request.uri'} = $uri;
257: my $filename = '/home/httpd/html' . $uri;
258: my $fh = Apache::File->new($filename);
259: my $file;
260: read $fh, $file, 100000000;
261:
262:
263: # Send header, don't cache this page
264: if ($env{'browser.mathml'}) {
265: &Apache::loncommon::content_type($r,'text/xml');
266: } else {
267: &Apache::loncommon::content_type($r,'text/html');
268: }
269: $r->send_http_header;
270: return OK if $r->header_only;
271: $r->rflush();
272:
273: # Discard result, we just want the objects that get created by the
274: # xml parsing
275: &Apache::lonxml::xmlparse($r, 'helper', $file);
276:
277: my $allowed = $helper->allowedCheck();
278: if (!$allowed) {
279: $env{'user.error.msg'} = $env{'request.uri'}.':'.$helper->{REQUIRED_PRIV}.
280: ":0:0:Permission denied to access this helper.";
281: return HTTP_NOT_ACCEPTABLE;
282: }
283:
284: $helper->process();
285:
286: $r->print($helper->display());
287: return OK;
288: }
289:
290: sub registerHelperTags {
291: for my $tagList (@helperTags) {
292: Apache::lonxml::register($tagList->[0], $tagList->[1]);
293: }
294: }
295:
296: sub unregisterHelperTags {
297: for my $tagList (@helperTags) {
298: Apache::lonxml::deregister($tagList->[0], $tagList->[1]);
299: }
300: }
301:
302: sub start_helper {
303: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
304:
305: if ($target ne 'helper') {
306: return '';
307: }
308:
309: registerHelperTags();
310:
311: Apache::lonhelper::helper->new($token->[2]{'title'}, $token->[2]{'requiredpriv'});
312: return '';
313: }
314:
315: sub end_helper {
316: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
317:
318: if ($target ne 'helper') {
319: return '';
320: }
321:
322: unregisterHelperTags();
323:
324: return '';
325: }
326:
327: sub start_state {
328: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
329:
330: if ($target ne 'helper') {
331: return '';
332: }
333:
334: Apache::lonhelper::state->new($token->[2]{'name'},
335: $token->[2]{'title'});
336: return '';
337: }
338:
339: # Use this to get the param hash from other files.
340: sub getParamHash {
341: return $paramHash;
342: }
343:
344: # Use this to get the helper, if implementing elements in other files
345: # (like lonprintout.pm)
346: sub getHelper {
347: return $helper;
348: }
349:
350: # don't need this, so ignore it
351: sub end_state {
352: return '';
353: }
354:
355: 1;
356:
357: package Apache::lonhelper::helper;
358:
359: use Digest::MD5 qw(md5_hex);
360: use HTML::Entities();
361: use Apache::loncommon;
362: use Apache::File;
363: use Apache::lonlocal;
364: use Apache::lonnet;
365:
366: sub new {
367: my $proto = shift;
368: my $class = ref($proto) || $proto;
369: my $self = {};
370:
371: $self->{TITLE} = shift;
372: $self->{REQUIRED_PRIV} = shift;
373:
374: # If there is a state from the previous form, use that. If there is no
375: # state, use the start state parameter.
376: if (defined $env{"form.CURRENT_STATE"})
377: {
378: $self->{STATE} = $env{"form.CURRENT_STATE"};
379: }
380: else
381: {
382: $self->{STATE} = "START";
383: }
384:
385: $self->{TOKEN} = $env{'form.TOKEN'};
386: # If a token was passed, we load that in. Otherwise, we need to create a
387: # new storage file
388: # Tried to use standard Tie'd hashes, but you can't seem to take a
389: # reference to a tied hash and write to it. I'd call that a wart.
390: if ($self->{TOKEN}) {
391: # Validate the token before trusting it
392: if ($self->{TOKEN} !~ /^[a-f0-9]{32}$/) {
393: # Not legit. Return nothing and let all hell break loose.
394: # User shouldn't be doing that!
395: return undef;
396: }
397:
398: # Get the hash.
399: $self->{FILENAME} = $Apache::lonnet::tmpdir . md5_hex($self->{TOKEN}); # Note the token is not the literal file
400:
401: my $file = Apache::File->new($self->{FILENAME});
402: my $contents = <$file>;
403:
404: # Now load in the contents
405: for my $value (split (/&/, $contents)) {
406: my ($name, $value) = split(/=/, $value);
407: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
408: $self->{VARS}->{$name} = $value;
409: }
410:
411: $file->close();
412: } else {
413: # Only valid if we're just starting.
414: if ($self->{STATE} ne 'START') {
415: return undef;
416: }
417: # Must create the storage
418: $self->{TOKEN} = md5_hex($env{'user.name'} . $env{'user.domain'} .
419: time() . rand());
420: $self->{FILENAME} = $Apache::lonnet::tmpdir . md5_hex($self->{TOKEN});
421: }
422:
423: # OK, we now have our persistent storage.
424:
425: if (defined $env{"form.RETURN_PAGE"})
426: {
427: $self->{RETURN_PAGE} = $env{"form.RETURN_PAGE"};
428: }
429: else
430: {
431: $self->{RETURN_PAGE} = $ENV{REFERER};
432: }
433:
434: $self->{STATES} = {};
435: $self->{DONE} = 0;
436:
437: # Used by various helpers for various things; see lonparm.helper
438: # for an example.
439: $self->{DATA} = {};
440:
441: $helper = $self;
442:
443: # Establish the $paramHash
444: $paramHash = {};
445:
446: bless($self, $class);
447: return $self;
448: }
449:
450: # Private function; returns a string to construct the hidden fields
451: # necessary to have the helper track state.
452: sub _saveVars {
453: my $self = shift;
454: my $result = "";
455: $result .= '<input type="hidden" name="CURRENT_STATE" value="' .
456: HTML::Entities::encode($self->{STATE},'<>&"') . "\" />\n";
457: $result .= '<input type="hidden" name="TOKEN" value="' .
458: $self->{TOKEN} . "\" />\n";
459: $result .= '<input type="hidden" name="RETURN_PAGE" value="' .
460: HTML::Entities::encode($self->{RETURN_PAGE},'<>&"') . "\" />\n";
461:
462: return $result;
463: }
464:
465: # Private function: Create the querystring-like representation of the stored
466: # data to write to disk.
467: sub _varsInFile {
468: my $self = shift;
469: my @vars = ();
470: for my $key (keys %{$self->{VARS}}) {
471: push @vars, &Apache::lonnet::escape($key) . '=' .
472: &Apache::lonnet::escape($self->{VARS}->{$key});
473: }
474: return join ('&', @vars);
475: }
476:
477: # Use this to declare variables.
478: # FIXME: Document this
479: sub declareVar {
480: my $self = shift;
481: my $var = shift;
482:
483: if (!defined($self->{VARS}->{$var})) {
484: $self->{VARS}->{$var} = '';
485: }
486:
487: my $envname = 'form.' . $var . '.forminput';
488: if (defined($env{$envname})) {
489: if (ref($env{$envname})) {
490: $self->{VARS}->{$var} = join('|||', @{$env{$envname}});
491: } else {
492: $self->{VARS}->{$var} = $env{$envname};
493: }
494: }
495: }
496:
497: sub allowedCheck {
498: my $self = shift;
499:
500: if (!defined($self->{REQUIRED_PRIV})) {
501: return 1;
502: }
503:
504: return Apache::lonnet::allowed($self->{REQUIRED_PRIV}, $env{'request.course.id'});
505: }
506:
507: sub changeState {
508: my $self = shift;
509: $self->{STATE} = shift;
510: }
511:
512: sub registerState {
513: my $self = shift;
514: my $state = shift;
515:
516: my $stateName = $state->name();
517: $self->{STATES}{$stateName} = $state;
518: }
519:
520: sub process {
521: my $self = shift;
522:
523: # Phase 1: Post processing for state of previous screen (which is actually
524: # the "current state" in terms of the helper variables), if it wasn't the
525: # beginning state.
526: if ($self->{STATE} ne "START" || $env{"form.SUBMIT"} eq &mt("Next ->")) {
527: my $prevState = $self->{STATES}{$self->{STATE}};
528: $prevState->postprocess();
529: }
530:
531: # Note, to handle errors in a state's input that a user must correct,
532: # do not transition in the postprocess, and force the user to correct
533: # the error.
534:
535: # Phase 2: Preprocess current state
536: my $startState = $self->{STATE};
537: my $state = $self->{STATES}->{$startState};
538:
539: # For debugging, print something here to determine if you're going
540: # to an undefined state.
541: if (!defined($state)) {
542: return;
543: }
544: $state->preprocess();
545:
546: # Phase 3: While the current state is different from the previous state,
547: # keep processing.
548: while ( $startState ne $self->{STATE} &&
549: defined($self->{STATES}->{$self->{STATE}}) )
550: {
551: $startState = $self->{STATE};
552: $state = $self->{STATES}->{$startState};
553: $state->preprocess();
554: }
555:
556: return;
557: }
558:
559: # 1: Do the post processing for the previous state.
560: # 2: Do the preprocessing for the current state.
561: # 3: Check to see if state changed, if so, postprocess current and move to next.
562: # Repeat until state stays stable.
563: # 4: Render the current state to the screen as an HTML page.
564: sub display {
565: my $self = shift;
566:
567: my $state = $self->{STATES}{$self->{STATE}};
568:
569: my $result = "";
570:
571: if (!defined($state)) {
572: $result = "<font color='#ff0000'>Error: state '$state' not defined!</font>";
573: return $result;
574: }
575:
576: # Phase 4: Display.
577: my $stateTitle=&mt($state->title());
578: my $browser_searcher_js =
579: '<script type="text/javascript">'."\n".
580: &Apache::loncommon::browser_and_searcher_javascript().
581: "\n".'</script>';
582:
583: $result .= &Apache::loncommon::start_page($self->{TITLE},
584: $browser_searcher_js);
585:
586: my $previous = HTML::Entities::encode(&mt("<- Previous"), '<>&"');
587: my $next = HTML::Entities::encode(&mt("Next ->"), '<>&"');
588: # FIXME: This should be parameterized, not concatenated - Jeremy
589:
590:
591: if (!$state->overrideForm()) { $result.="<form name='helpform' method='POST'>"; }
592: $result .= <<HEADER;
593: <table border="0" width='100%'><tr><td>
594: <h2><i>$stateTitle</i></h2>
595: HEADER
596:
597: $result .= "<table cellpadding='10' width='100%'><tr><td rowspan='2' valign='top'>";
598:
599: if (!$state->overrideForm()) {
600: $result .= $self->_saveVars();
601: }
602: $result .= $state->render();
603:
604: $result .= "</td><td valign='top' align='right'>";
605:
606: # Warning: Copy and pasted from below, because it's too much trouble to
607: # turn this into a subroutine
608: if (!$state->overrideForm()) {
609: if ($self->{STATE} ne $self->{START_STATE}) {
610: #$result .= '<input name="SUBMIT" type="submit" value="<- Previous" /> ';
611: }
612: if ($self->{DONE}) {
613: my $returnPage = $self->{RETURN_PAGE};
614: $result .= "<a href=\"$returnPage\">" . &mt("End Helper") . "</a>";
615: }
616: else {
617: $result .= '<nobr><input name="back" type="button" ';
618: $result .= 'value="' . $previous . '" onclick="history.go(-1)" /> ';
619: $result .= '<input name="SUBMIT" type="submit" value="' . $next . '" /></nobr>';
620: }
621: }
622:
623: $result .= "</td></tr><tr><td valign='bottom' align='right'>";
624:
625: # Warning: Copy and pasted from above, because it's too much trouble to
626: # turn this into a subroutine
627: if (!$state->overrideForm()) {
628: if ($self->{STATE} ne $self->{START_STATE}) {
629: #$result .= '<input name="SUBMIT" type="submit" value="<- Previous" /> ';
630: }
631: if ($self->{DONE}) {
632: my $returnPage = $self->{RETURN_PAGE};
633: $result .= "<a href=\"$returnPage\">" . &mt('End Helper') . "</a>";
634: }
635: else {
636: $result .= '<nobr><input name="back" type="button" ';
637: $result .= 'value="' . $previous . '" onclick="history.go(-1)" /> ';
638: $result .= '<input name="SUBMIT" type="submit" value="' . $next . '" /></nobr>';
639: }
640: }
641:
642: #foreach my $key (keys %{$self->{VARS}}) {
643: # $result .= "|$key| -> " . $self->{VARS}->{$key} . "<br />";
644: #}
645:
646: $result .= "</td></tr></table>";
647:
648: $result .= <<FOOTER;
649: </td>
650: </tr>
651: </table>
652: </form>
653: FOOTER
654:
655: $result .= &Apache::loncommon::end_page();
656: # Handle writing out the vars to the file
657: my $file = Apache::File->new('>'.$self->{FILENAME});
658: print $file $self->_varsInFile();
659:
660: return $result;
661: }
662:
663: 1;
664:
665: package Apache::lonhelper::state;
666:
667: # States bundle things together and are responsible for compositing the
668: # various elements together. It is not generally necessary for users to
669: # use the state object directly, so it is not perldoc'ed.
670:
671: # Basically, all the states do is pass calls to the elements and aggregate
672: # the results.
673:
674: sub new {
675: my $proto = shift;
676: my $class = ref($proto) || $proto;
677: my $self = {};
678:
679: $self->{NAME} = shift;
680: $self->{TITLE} = shift;
681: $self->{ELEMENTS} = [];
682:
683: bless($self, $class);
684:
685: $helper->registerState($self);
686:
687: $state = $self;
688:
689: return $self;
690: }
691:
692: sub name {
693: my $self = shift;
694: return $self->{NAME};
695: }
696:
697: sub title {
698: my $self = shift;
699: return $self->{TITLE};
700: }
701:
702: sub preprocess {
703: my $self = shift;
704: for my $element (@{$self->{ELEMENTS}}) {
705: $element->preprocess();
706: }
707: }
708:
709: # FIXME: Document that all postprocesses must return a true value or
710: # the state transition will be overridden
711: sub postprocess {
712: my $self = shift;
713:
714: # Save the state so we can roll it back if we need to.
715: my $originalState = $helper->{STATE};
716: my $everythingSuccessful = 1;
717:
718: for my $element (@{$self->{ELEMENTS}}) {
719: my $result = $element->postprocess();
720: if (!$result) { $everythingSuccessful = 0; }
721: }
722:
723: # If not all the postprocesses were successful, override
724: # any state transitions that may have occurred. It is the
725: # responsibility of the states to make sure they have
726: # error handling in that case.
727: if (!$everythingSuccessful) {
728: $helper->{STATE} = $originalState;
729: }
730: }
731:
732: # Override the form if any element wants to.
733: # two elements overriding the form will make a mess, but that should
734: # be considered helper author error ;-)
735: sub overrideForm {
736: my $self = shift;
737: for my $element (@{$self->{ELEMENTS}}) {
738: if ($element->overrideForm()) {
739: return 1;
740: }
741: }
742: return 0;
743: }
744:
745: sub addElement {
746: my $self = shift;
747: my $element = shift;
748:
749: push @{$self->{ELEMENTS}}, $element;
750: }
751:
752: sub render {
753: my $self = shift;
754: my @results = ();
755:
756: for my $element (@{$self->{ELEMENTS}}) {
757: push @results, $element->render();
758: }
759:
760: return join("\n", @results);
761: }
762:
763: 1;
764:
765: package Apache::lonhelper::element;
766: # Support code for elements
767:
768: =pod
769:
770: =head1 Element Base Class
771:
772: The Apache::lonhelper::element base class provides support for elements
773: and defines some generally useful tags for use in elements.
774:
775: =head2 finalcode tagX<finalcode>
776:
777: Each element can contain a "finalcode" tag that, when the special FINAL
778: helper state is used, will be executed, surrounded by "sub { my $helper = shift;"
779: and "}". It is expected to return a string describing what it did, which
780: may be an empty string. See course initialization helper for an example. This is
781: generally intended for helpers like the course initialization helper, which consist
782: of several panels, each of which is performing some sort of bite-sized functionality.
783:
784: =head2 defaultvalue tagX<defaultvalue>
785:
786: Each element that accepts user input can contain a "defaultvalue" tag that,
787: when surrounded by "sub { my $helper = shift; my $state = shift; " and "}",
788: will form a subroutine that when called will provide a default value for
789: the element. How this value is interpreted by the element is specific to
790: the element itself, and possibly the settings the element has (such as
791: multichoice vs. single choice for <choices> tags).
792:
793: This is also intended for things like the course initialization wizard, where the
794: user is setting various parameters. By correctly grabbing current settings
795: and including them into the helper, it allows the user to come back to the
796: helper later and re-execute it, without needing to worry about overwriting
797: some setting accidentally.
798:
799: Again, see the course initialization helper for examples.
800:
801: =head2 validator tagX<validator>
802:
803: Some elements that accepts user input can contain a "validator" tag that,
804: when surrounded by "sub { my $helper = shift; my $state = shift; my $element = shift; my $val = shift "
805: and "}", where "$val" is the value the user entered, will form a subroutine
806: that when called will verify whether the given input is valid or not. If it
807: is valid, the routine will return a false value. If invalid, the routine
808: will return an error message to be displayed for the user.
809:
810: Consult the documentation for each element to see whether it supports this
811: tag.
812:
813: =head2 getValue methodX<getValue (helper elements)>
814:
815: If the element stores the name of the variable in a 'variable' member, which
816: the provided ones all do, you can retreive the value of the variable by calling
817: this method.
818:
819: =cut
820:
821: BEGIN {
822: &Apache::lonhelper::register('Apache::lonhelper::element',
823: ('nextstate', 'finalcode',
824: 'defaultvalue', 'validator'));
825: }
826:
827: # Because we use the param hash, this is often a sufficent
828: # constructor
829: sub new {
830: my $proto = shift;
831: my $class = ref($proto) || $proto;
832: my $self = $paramHash;
833: bless($self, $class);
834:
835: $self->{PARAMS} = $paramHash;
836: $self->{STATE} = $state;
837: $state->addElement($self);
838:
839: # Ensure param hash is not reused
840: $paramHash = {};
841:
842: return $self;
843: }
844:
845: sub start_nextstate {
846: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
847:
848: if ($target ne 'helper') {
849: return '';
850: }
851:
852: $paramHash->{NEXTSTATE} = &Apache::lonxml::get_all_text('/nextstate',
853: $parser);
854: return '';
855: }
856:
857: sub end_nextstate { return ''; }
858:
859: sub start_finalcode {
860: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
861:
862: if ($target ne 'helper') {
863: return '';
864: }
865:
866: $paramHash->{FINAL_CODE} = &Apache::lonxml::get_all_text('/finalcode',
867: $parser);
868: return '';
869: }
870:
871: sub end_finalcode { return ''; }
872:
873: sub start_defaultvalue {
874: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
875:
876: if ($target ne 'helper') {
877: return '';
878: }
879:
880: $paramHash->{DEFAULT_VALUE} = &Apache::lonxml::get_all_text('/defaultvalue',
881: $parser);
882: $paramHash->{DEFAULT_VALUE} = 'sub { my $helper = shift; my $state = shift;' .
883: $paramHash->{DEFAULT_VALUE} . '}';
884: return '';
885: }
886:
887: sub end_defaultvalue { return ''; }
888:
889: # Validators may need to take language specifications
890: sub start_validator {
891: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
892:
893: if ($target ne 'helper') {
894: return '';
895: }
896:
897: $paramHash->{VALIDATOR} = &Apache::lonxml::get_all_text('/validator',
898: $parser);
899: $paramHash->{VALIDATOR} = 'sub { my $helper = shift; my $state = shift; my $element = shift; my $val = shift;' .
900: $paramHash->{VALIDATOR} . '}';
901: return '';
902: }
903:
904: sub end_validator { return ''; }
905:
906: sub preprocess {
907: return 1;
908: }
909:
910: sub postprocess {
911: return 1;
912: }
913:
914: sub render {
915: return '';
916: }
917:
918: sub overrideForm {
919: return 0;
920: }
921:
922: sub getValue {
923: my $self = shift;
924: return $helper->{VARS}->{$self->{'variable'}};
925: }
926:
927: 1;
928:
929: package Apache::lonhelper::message;
930:
931: =pod
932:
933: =head1 Elements
934:
935: =head2 Element: messageX<message, helper element>
936:
937: Message elements display their contents, and
938: transition directly to the state in the <nextstate> attribute. Example:
939:
940: <message nextstate='GET_NAME'>
941: This is the <b>message</b> the user will see,
942: <i>HTML allowed</i>.
943: </message>
944:
945: This will display the HTML message and transition to the 'nextstate' if
946: given. The HTML will be directly inserted into the helper, so if you don't
947: want text to run together, you'll need to manually wrap the message text
948: in <p> tags, or whatever is appropriate for your HTML.
949:
950: Message tags do not add in whitespace, so if you want it, you'll need to add
951: it into states. This is done so you can inline some elements, such as
952: the <date> element, right between two messages, giving the appearence that
953: the <date> element appears inline. (Note the elements can not be embedded
954: within each other.)
955:
956: This is also a good template for creating your own new states, as it has
957: very little code beyond the state template.
958:
959: =head3 Localization
960:
961: The contents of the message tag will be run through the
962: normalize_string function and that will be used as a call to &mt.
963:
964: =cut
965:
966: no strict;
967: @ISA = ("Apache::lonhelper::element");
968: use strict;
969: use Apache::lonlocal;
970:
971: BEGIN {
972: &Apache::lonhelper::register('Apache::lonhelper::message',
973: ('message'));
974: }
975:
976: sub new {
977: my $ref = Apache::lonhelper::element->new();
978: bless($ref);
979: }
980:
981: # CONSTRUCTION: Construct the message element from the XML
982: sub start_message {
983: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
984:
985: if ($target ne 'helper') {
986: return '';
987: }
988:
989: $paramHash->{MESSAGE_TEXT} = &mtn(&Apache::lonxml::get_all_text('/message',
990: $parser));
991:
992: if (defined($token->[2]{'nextstate'})) {
993: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
994: }
995: return '';
996: }
997:
998: sub end_message {
999: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1000:
1001: if ($target ne 'helper') {
1002: return '';
1003: }
1004: Apache::lonhelper::message->new();
1005: return '';
1006: }
1007:
1008: sub render {
1009: my $self = shift;
1010:
1011: return &mtn($self->{MESSAGE_TEXT});
1012: }
1013: # If a NEXTSTATE was given, switch to it
1014: sub postprocess {
1015: my $self = shift;
1016: if (defined($self->{NEXTSTATE})) {
1017: $helper->changeState($self->{NEXTSTATE});
1018: }
1019:
1020: return 1;
1021: }
1022: 1;
1023:
1024: package Apache::lonhelper::choices;
1025:
1026: =pod
1027:
1028: =head2 Element: choicesX<choices, helper element>
1029:
1030: Choice states provide a single choice to the user as a text selection box.
1031: A "choice" is two pieces of text, one which will be displayed to the user
1032: (the "human" value), and one which will be passed back to the program
1033: (the "computer" value). For instance, a human may choose from a list of
1034: resources on disk by title, while your program wants the file name.
1035:
1036: <choices> takes an attribute "variable" to control which helper variable
1037: the result is stored in.
1038:
1039: <choices> takes an attribute "multichoice" which, if set to a true
1040: value, will allow the user to select multiple choices.
1041:
1042: <choices> takes an attribute "allowempty" which, if set to a true
1043: value, will allow the user to select none of the choices without raising
1044: an error message.
1045:
1046: =head3 SUB-TAGS
1047:
1048: <choices> can have the following subtags:X<choice, helper tag>
1049:
1050: =over 4
1051:
1052: =item * <nextstate>state_name</nextstate>: If given, this will cause the
1053: choice element to transition to the given state after executing.
1054: This will override the <nextstate> passed to <choices> (if any).
1055:
1056: =item * <choice />: If the choices are static,
1057: this element will allow you to specify them. Each choice
1058: contains attribute, "computer", as described above. The
1059: content of the tag will be used as the human label.
1060: For example,
1061: <choice computer='234-12-7312'>Bobby McDormik</choice>.
1062:
1063: <choice> can take a parameter "eval", which if set to
1064: a true value, will cause the contents of the tag to be
1065: evaluated as it would be in an <eval> tag; see <eval> tag
1066: below.
1067:
1068: <choice> may optionally contain a 'nextstate' attribute, which
1069: will be the state transistioned to if the choice is made, if
1070: the choice is not multichoice. This will override the nextstate
1071: passed to the parent C<choices> tag.
1072:
1073: <choice> may optionally contain a 'relatedvalue' attribute, which
1074: if present will cause a text entry to appear to the right of the
1075: selection. The value of the relatedvalue attribute is a variable
1076: into which the text entry will be stored e.g.:
1077: <choice computer='numberprovided" relatedvalue="num">Type the number in:</choice>
1078:
1079: <choice> may contain a relatededefault atribute which, if the
1080: relatedvalue attribute is present will be the initial value of the input
1081: box.
1082:
1083: =back
1084:
1085: To create the choices programmatically, either wrap the choices in
1086: <condition> tags (prefered), or use an <exec> block inside the <choice>
1087: tag. Store the choices in $state->{CHOICES}, which is a list of list
1088: references, where each list has three strings. The first is the human
1089: name, the second is the computer name. and the third is the option
1090: next state. For example:
1091:
1092: <exec>
1093: for (my $i = 65; $i < 65 + 26; $i++) {
1094: push @{$state->{CHOICES}}, [chr($i), $i, 'next'];
1095: }
1096: </exec>
1097:
1098: This will allow the user to select from the letters A-Z (in ASCII), while
1099: passing the ASCII value back into the helper variables, and the state
1100: will in all cases transition to 'next'.
1101:
1102: You can mix and match methods of creating choices, as long as you always
1103: "push" onto the choice list, rather then wiping it out. (You can even
1104: remove choices programmatically, but that would probably be bad form.)
1105:
1106: =head3 defaultvalue support
1107:
1108: Choices supports default values both in multichoice and single choice mode.
1109: In single choice mode, have the defaultvalue tag's function return the
1110: computer value of the box you want checked. If the function returns a value
1111: that does not correspond to any of the choices, the default behavior of selecting
1112: the first choice will be preserved.
1113:
1114: For multichoice, return a string with the computer values you want checked,
1115: delimited by triple pipes. Note this matches how the result of the <choices>
1116: tag is stored in the {VARS} hash.
1117:
1118: =cut
1119:
1120: no strict;
1121: @ISA = ("Apache::lonhelper::element");
1122: use strict;
1123: use Apache::lonlocal;
1124: use Apache::lonnet;
1125:
1126: BEGIN {
1127: &Apache::lonhelper::register('Apache::lonhelper::choices',
1128: ('choice', 'choices'));
1129: }
1130:
1131: sub new {
1132: my $ref = Apache::lonhelper::element->new();
1133: bless($ref);
1134: }
1135:
1136: # CONSTRUCTION: Construct the message element from the XML
1137: sub start_choices {
1138: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1139:
1140: if ($target ne 'helper') {
1141: return '';
1142: }
1143:
1144: # Need to initialize the choices list, so everything can assume it exists
1145: $paramHash->{'variable'} = $token->[2]{'variable'} if (!defined($paramHash->{'variable'}));
1146: $helper->declareVar($paramHash->{'variable'});
1147: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
1148: $paramHash->{'allowempty'} = $token->[2]{'allowempty'};
1149: $paramHash->{CHOICES} = [];
1150: return '';
1151: }
1152:
1153: sub end_choices {
1154: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1155:
1156: if ($target ne 'helper') {
1157: return '';
1158: }
1159: Apache::lonhelper::choices->new();
1160: return '';
1161: }
1162:
1163: sub start_choice {
1164: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1165:
1166: if ($target ne 'helper') {
1167: return '';
1168: }
1169:
1170: my $computer = $token->[2]{'computer'};
1171: my $human = &mt(&Apache::lonxml::get_all_text('/choice',
1172: $parser));
1173: my $nextstate = $token->[2]{'nextstate'};
1174: my $evalFlag = $token->[2]{'eval'};
1175: my $relatedVar = $token->[2]{'relatedvalue'};
1176: my $relatedDefault = $token->[2]{'relateddefault'};
1177: push @{$paramHash->{CHOICES}}, [&mtn($human), $computer, $nextstate,
1178: $evalFlag, $relatedVar, $relatedDefault];
1179: return '';
1180: }
1181:
1182: sub end_choice {
1183: return '';
1184: }
1185:
1186: {
1187: # used to generate unique id attributes for <input> tags.
1188: # internal use only.
1189: my $id = 0;
1190: sub new_id { return $id++; }
1191: }
1192:
1193: sub render {
1194: my $self = shift;
1195: my $var = $self->{'variable'};
1196: my $buttons = '';
1197: my $result = '';
1198:
1199: if ($self->{'multichoice'}) {
1200: $result .= <<SCRIPT;
1201: <script type="text/javascript">
1202: // <!--
1203: function checkall(value, checkName) {
1204: for (i=0; i<document.forms.helpform.elements.length; i++) {
1205: ele = document.forms.helpform.elements[i];
1206: if (ele.name == checkName + '.forminput') {
1207: document.forms.helpform.elements[i].checked=value;
1208: }
1209: }
1210: }
1211: // -->
1212: </script>
1213: SCRIPT
1214: }
1215:
1216: # Only print "select all" and "unselect all" if there are five or
1217: # more choices; fewer then that and it looks silly.
1218: if ($self->{'multichoice'} && scalar(@{$self->{CHOICES}}) > 4) {
1219: my %lt=&Apache::lonlocal::texthash(
1220: 'sa' => "Select All",
1221: 'ua' => "Unselect All");
1222: $buttons = <<BUTTONS;
1223: <br />
1224: <input type="button" onclick="checkall(true, '$var')" value="$lt{'sa'}" />
1225: <input type="button" onclick="checkall(false, '$var')" value="$lt{'ua'}" />
1226: <br />
1227: BUTTONS
1228: }
1229:
1230: if (defined $self->{ERROR_MSG}) {
1231: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br />';
1232: }
1233:
1234: $result .= $buttons;
1235:
1236: $result .= "<table>\n\n";
1237:
1238: my %checkedChoices;
1239: my $checkedChoicesFunc;
1240:
1241: if (defined($self->{DEFAULT_VALUE})) {
1242: $checkedChoicesFunc = eval ($self->{DEFAULT_VALUE});
1243: die 'Error in default value code for variable ' .
1244: $self->{'variable'} . ', Perl said: ' . $@ if $@;
1245: } else {
1246: $checkedChoicesFunc = sub { return ''; };
1247: }
1248:
1249: # Process which choices should be checked.
1250: if ($self->{'multichoice'}) {
1251: for my $selectedChoice (split(/\|\|\|/, (&$checkedChoicesFunc($helper, $self)))) {
1252: $checkedChoices{$selectedChoice} = 1;
1253: }
1254: } else {
1255: # single choice
1256: my $selectedChoice = &$checkedChoicesFunc($helper, $self);
1257:
1258: my $foundChoice = 0;
1259:
1260: # check that the choice is in the list of choices.
1261: for my $choice (@{$self->{CHOICES}}) {
1262: if ($choice->[1] eq $selectedChoice) {
1263: $checkedChoices{$choice->[1]} = 1;
1264: $foundChoice = 1;
1265: }
1266: }
1267:
1268: # If we couldn't find the choice, pick the first one
1269: if (!$foundChoice) {
1270: $checkedChoices{$self->{CHOICES}->[0]->[1]} = 1;
1271: }
1272: }
1273:
1274: my $type = "radio";
1275: if ($self->{'multichoice'}) { $type = 'checkbox'; }
1276: foreach my $choice (@{$self->{CHOICES}}) {
1277: my $id = &new_id();
1278: $result .= "<tr>\n<td width='20'> </td>\n";
1279: $result .= "<td valign='top'><input type='$type' name='$var.forminput'"
1280: . " value='" .
1281: HTML::Entities::encode($choice->[1],"<>&\"'")
1282: . "'";
1283: if ($checkedChoices{$choice->[1]}) {
1284: $result .= " checked='checked' ";
1285: }
1286: $result .= qq{id="id$id"};
1287: my $choiceLabel = $choice->[0];
1288: if ($choice->[3]) { # if we need to evaluate this choice
1289: $choiceLabel = "sub { my $helper = shift; my $state = shift;" .
1290: $choiceLabel . "}";
1291: $choiceLabel = eval($choiceLabel);
1292: $choiceLabel = &$choiceLabel($helper, $self);
1293: }
1294: $result .= "/></td><td> ".qq{<label for="id$id">}.
1295: $choiceLabel. "</label></td>";
1296: if ($choice->[4]) {
1297: $result .='<td><input type="text" size="5" name="'
1298: .$choice->[4].'.forminput" value="'
1299: .$choice->[5].'" /></td>';
1300: }
1301: $result .= "</tr>\n";
1302: }
1303: $result .= "</table>\n\n\n";
1304: $result .= $buttons;
1305:
1306: return $result;
1307: }
1308:
1309: # If a NEXTSTATE was given or a nextstate for this choice was
1310: # given, switch to it
1311: sub postprocess {
1312: my $self = shift;
1313: my $chosenValue = $env{'form.' . $self->{'variable'} . '.forminput'};
1314:
1315: if (!defined($chosenValue) && !$self->{'allowempty'}) {
1316: $self->{ERROR_MSG} =
1317: &mt("You must choose one or more choices to continue.");
1318: return 0;
1319: }
1320:
1321: if (ref($chosenValue)) {
1322: $helper->{VARS}->{$self->{'variable'}} = join('|||', @$chosenValue);
1323: }
1324:
1325: if (defined($self->{NEXTSTATE})) {
1326: $helper->changeState($self->{NEXTSTATE});
1327: }
1328:
1329: foreach my $choice (@{$self->{CHOICES}}) {
1330: if ($choice->[1] eq $chosenValue) {
1331: if (defined($choice->[2])) {
1332: $helper->changeState($choice->[2]);
1333: }
1334: }
1335: if ($choice->[4]) {
1336: my $varname = $choice->[4];
1337: $helper->{'VARS'}->{$varname} = $env{'form.'."$varname.forminput"};
1338: }
1339: }
1340: return 1;
1341: }
1342: 1;
1343:
1344: package Apache::lonhelper::dropdown;
1345:
1346: =pod
1347:
1348: =head2 Element: dropdownX<dropdown, helper tag>
1349:
1350: A drop-down provides a drop-down box instead of a radio button
1351: box. Because most people do not know how to use a multi-select
1352: drop-down box, that option is not allowed. Otherwise, the arguments
1353: are the same as "choices", except "allowempty" is also meaningless.
1354:
1355: <dropdown> takes an attribute "variable" to control which helper variable
1356: the result is stored in.
1357:
1358: =head3 SUB-TAGS
1359:
1360: <choice>, which acts just as it does in the "choices" element.
1361:
1362: =cut
1363:
1364: # This really ought to be a sibling class to "choice" which is itself
1365: # a child of some abstract class.... *shrug*
1366:
1367: no strict;
1368: @ISA = ("Apache::lonhelper::element");
1369: use strict;
1370: use Apache::lonlocal;
1371: use Apache::lonnet;
1372:
1373: BEGIN {
1374: &Apache::lonhelper::register('Apache::lonhelper::dropdown',
1375: ('dropdown'));
1376: }
1377:
1378: sub new {
1379: my $ref = Apache::lonhelper::element->new();
1380: bless($ref);
1381: }
1382:
1383: # CONSTRUCTION: Construct the message element from the XML
1384: sub start_dropdown {
1385: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1386:
1387: if ($target ne 'helper') {
1388: return '';
1389: }
1390:
1391: # Need to initialize the choices list, so everything can assume it exists
1392: $paramHash->{'variable'} = $token->[2]{'variable'} if (!defined($paramHash->{'variable'}));
1393: $helper->declareVar($paramHash->{'variable'});
1394: $paramHash->{CHOICES} = [];
1395: return '';
1396: }
1397:
1398: sub end_dropdown {
1399: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1400:
1401: if ($target ne 'helper') {
1402: return '';
1403: }
1404: Apache::lonhelper::dropdown->new();
1405: return '';
1406: }
1407:
1408: sub render {
1409: my $self = shift;
1410: my $var = $self->{'variable'};
1411: my $result = '';
1412:
1413: if (defined $self->{ERROR_MSG}) {
1414: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br />';
1415: }
1416:
1417: my %checkedChoices;
1418: my $checkedChoicesFunc;
1419:
1420: if (defined($self->{DEFAULT_VALUE})) {
1421: $checkedChoicesFunc = eval ($self->{DEFAULT_VALUE});
1422: die 'Error in default value code for variable ' .
1423: $self->{'variable'} . ', Perl said: ' . $@ if $@;
1424: } else {
1425: $checkedChoicesFunc = sub { return ''; };
1426: }
1427:
1428: # single choice
1429: my $selectedChoice = &$checkedChoicesFunc($helper, $self);
1430:
1431: my $foundChoice = 0;
1432:
1433: # check that the choice is in the list of choices.
1434: for my $choice (@{$self->{CHOICES}}) {
1435: if ($choice->[1] eq $selectedChoice) {
1436: $checkedChoices{$choice->[1]} = 1;
1437: $foundChoice = 1;
1438: }
1439: }
1440:
1441: # If we couldn't find the choice, pick the first one
1442: if (!$foundChoice) {
1443: $checkedChoices{$self->{CHOICES}->[0]->[1]} = 1;
1444: }
1445:
1446: $result .= "<select name='${var}.forminput'>\n";
1447: foreach my $choice (@{$self->{CHOICES}}) {
1448: $result .= "<option value='" .
1449: HTML::Entities::encode($choice->[1],"<>&\"'")
1450: . "'";
1451: if ($checkedChoices{$choice->[1]}) {
1452: $result .= " selected='selected' ";
1453: }
1454: my $choiceLabel = $choice->[0];
1455: if ($choice->[4]) { # if we need to evaluate this choice
1456: $choiceLabel = "sub { my $helper = shift; my $state = shift;" .
1457: $choiceLabel . "}";
1458: $choiceLabel = eval($choiceLabel);
1459: $choiceLabel = &$choiceLabel($helper, $self);
1460: }
1461: $result .= ">" . &mtn($choiceLabel) . "</option>\n";
1462: }
1463: $result .= "</select>\n";
1464:
1465: return $result;
1466: }
1467:
1468: # If a NEXTSTATE was given or a nextstate for this choice was
1469: # given, switch to it
1470: sub postprocess {
1471: my $self = shift;
1472: my $chosenValue = $env{'form.' . $self->{'variable'} . '.forminput'};
1473:
1474: if (!defined($chosenValue) && !$self->{'allowempty'}) {
1475: $self->{ERROR_MSG} = "You must choose one or more choices to" .
1476: " continue.";
1477: return 0;
1478: }
1479:
1480: if (defined($self->{NEXTSTATE})) {
1481: $helper->changeState($self->{NEXTSTATE});
1482: }
1483:
1484: foreach my $choice (@{$self->{CHOICES}}) {
1485: if ($choice->[1] eq $chosenValue) {
1486: if (defined($choice->[2])) {
1487: $helper->changeState($choice->[2]);
1488: }
1489: }
1490: }
1491: return 1;
1492: }
1493: 1;
1494:
1495: package Apache::lonhelper::date;
1496:
1497: =pod
1498:
1499: =head2 Element: dateX<date, helper element>
1500:
1501: Date elements allow the selection of a date with a drop down list.
1502:
1503: Date elements can take two attributes:
1504:
1505: =over 4
1506:
1507: =item * B<variable>: The name of the variable to store the chosen
1508: date in. Required.
1509:
1510: =item * B<hoursminutes>: If a true value, the date will show hours
1511: and minutes, as well as month/day/year. If false or missing,
1512: the date will only show the month, day, and year.
1513:
1514: =back
1515:
1516: Date elements contain only an option <nextstate> tag to determine
1517: the next state.
1518:
1519: Example:
1520:
1521: <date variable="DUE_DATE" hoursminutes="1">
1522: <nextstate>choose_why</nextstate>
1523: </date>
1524:
1525: =cut
1526:
1527: no strict;
1528: @ISA = ("Apache::lonhelper::element");
1529: use strict;
1530: use Apache::lonlocal; # A localization nightmare
1531: use Apache::lonnet;
1532: use Time::localtime;
1533:
1534: BEGIN {
1535: &Apache::lonhelper::register('Apache::lonhelper::date',
1536: ('date'));
1537: }
1538:
1539: # Don't need to override the "new" from element
1540: sub new {
1541: my $ref = Apache::lonhelper::element->new();
1542: bless($ref);
1543: }
1544:
1545: my @months = ("January", "February", "March", "April", "May", "June", "July",
1546: "August", "September", "October", "November", "December");
1547:
1548: # CONSTRUCTION: Construct the message element from the XML
1549: sub start_date {
1550: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1551:
1552: if ($target ne 'helper') {
1553: return '';
1554: }
1555:
1556: $paramHash->{'variable'} = $token->[2]{'variable'};
1557: $helper->declareVar($paramHash->{'variable'});
1558: $paramHash->{'hoursminutes'} = $token->[2]{'hoursminutes'};
1559: $paramHash->{'anytime'} = $token->[2]{'anytime'};
1560: }
1561:
1562: sub end_date {
1563: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1564:
1565: if ($target ne 'helper') {
1566: return '';
1567: }
1568: Apache::lonhelper::date->new();
1569: return '';
1570: }
1571:
1572: sub render {
1573: my $self = shift;
1574: my $result = "";
1575: my $var = $self->{'variable'};
1576:
1577: my $date;
1578:
1579: my $time=time;
1580: my ($anytime,$onclick);
1581:
1582:
1583: # first check VARS for a valid new value from the user
1584: # then check DEFAULT_VALUE for a valid default time value
1585: # otherwise pick now as reasonably good time
1586:
1587: if (defined($helper->{VARS}{$var})
1588: && $helper->{VARS}{$var} > 0) {
1589: $date = localtime($helper->{VARS}{$var});
1590: } elsif (defined($self->{DEFAULT_VALUE})) {
1591: my $valueFunc = eval($self->{DEFAULT_VALUE});
1592: die('Error in default value code for variable ' .
1593: $self->{'variable'} . ', Perl said: ' . $@) if $@;
1594: $time = &$valueFunc($helper, $self);
1595: if (lc($time) eq 'anytime') {
1596: $anytime=1;
1597: $date = localtime(time);
1598: $date->min(0);
1599: } elsif (defined($time) && $time ne 0) {
1600: $date = localtime($time);
1601: } else {
1602: # leave date undefined so it'll default to now
1603: }
1604: }
1605:
1606: if (!defined($date)) {
1607: $date = localtime(time);
1608: $date->min(0);
1609: }
1610:
1611: &Apache::lonnet::logthis("date mode ");
1612:
1613: if ($anytime) {
1614: $onclick = "onclick=\"javascript:updateCheck(this.form,'${var}anytime',false)\"";
1615: }
1616: # Default date: The current hour.
1617:
1618: if (defined $self->{ERROR_MSG}) {
1619: $result .= '<font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
1620: }
1621:
1622: # Month
1623: my $i;
1624: $result .= "<select $onclick name='${var}month'>\n";
1625: for ($i = 0; $i < 12; $i++) {
1626: if ($i == $date->mon) {
1627: $result .= "<option value='$i' selected='selected'>";
1628: } else {
1629: $result .= "<option value='$i'>";
1630: }
1631: $result .= &mt($months[$i]) . "</option>\n";
1632: }
1633: $result .= "</select>\n";
1634:
1635: # Day
1636: $result .= "<select $onclick name='${var}day'>\n";
1637: for ($i = 1; $i < 32; $i++) {
1638: if ($i == $date->mday) {
1639: $result .= '<option selected="selected">';
1640: } else {
1641: $result .= '<option>';
1642: }
1643: $result .= "$i</option>\n";
1644: }
1645: $result .= "</select>,\n";
1646:
1647: # Year
1648: $result .= "<select $onclick name='${var}year'>\n";
1649: for ($i = 2000; $i < 2030; $i++) { # update this after 64-bit dates
1650: if ($date->year + 1900 == $i) {
1651: $result .= "<option selected='selected'>";
1652: } else {
1653: $result .= "<option>";
1654: }
1655: $result .= "$i</option>\n";
1656: }
1657: $result .= "</select>,\n";
1658:
1659: # Display Hours and Minutes if they are called for
1660: if ($self->{'hoursminutes'}) {
1661: # This needs parameterization for times.
1662: my $am = &mt('a.m.');
1663: my $pm = &mt('p.m.');
1664: # Build hour
1665: $result .= "<select $onclick name='${var}hour'>\n";
1666: $result .= "<option " . ($date->hour == 0 ? 'selected="selected" ':'') .
1667: " value='0'>" . &mt('midnight') . "</option>\n";
1668: for ($i = 1; $i < 12; $i++) {
1669: if ($date->hour == $i) {
1670: $result .= "<option selected='selected' value='$i'>$i $am</option>\n";
1671: } else {
1672: $result .= "<option value='$i'>$i $am</option>\n";
1673: }
1674: }
1675: $result .= "<option " . ($date->hour == 12 ? 'selected="selected" ':'') .
1676: " value='12'>" . &mt('noon') . "</option>\n";
1677: for ($i = 13; $i < 24; $i++) {
1678: my $printedHour = $i - 12;
1679: if ($date->hour == $i) {
1680: $result .= "<option selected='selected' value='$i'>$printedHour $pm</option>\n";
1681: } else {
1682: $result .= "<option value='$i'>$printedHour $pm</option>\n";
1683: }
1684: }
1685:
1686: $result .= "</select> :\n";
1687:
1688: $result .= "<select $onclick name='${var}minute'>\n";
1689: my $selected=0;
1690: for my $i ((0,15,30,45,59,undef,0..59)) {
1691: my $printedMinute = $i;
1692: if (defined($i) && $i < 10) {
1693: $printedMinute = "0" . $printedMinute;
1694: }
1695: if (!$selected && $date->min == $i) {
1696: $result .= "<option selected='selected'>";
1697: $selected=1;
1698: } else {
1699: $result .= "<option>";
1700: }
1701: $result .= "$printedMinute</option>\n";
1702: }
1703: $result .= "</select>\n";
1704: }
1705: if ($self->{'anytime'}) {
1706: $result.=(<<CHECK);
1707: <script type="text/javascript">
1708: // <!--
1709: function updateCheck(form,name,value) {
1710: var checkbox=form[name];
1711: checkbox.checked = value;
1712: }
1713: // -->
1714: </script>
1715: CHECK
1716: $result.=" or <label><input type='checkbox' ";
1717: if ($anytime) {
1718: $result.=' checked="checked" '
1719: }
1720: $result.="name='${var}anytime'/>".&mt('Any time').'</label>'
1721: }
1722: return $result;
1723:
1724: }
1725: # If a NEXTSTATE was given, switch to it
1726: sub postprocess {
1727: my $self = shift;
1728: my $var = $self->{'variable'};
1729: if ($env{'form.' . $var . 'anytime'}) {
1730: $helper->{VARS}->{$var} = undef;
1731: } else {
1732: my $month = $env{'form.' . $var . 'month'};
1733: my $day = $env{'form.' . $var . 'day'};
1734: my $year = $env{'form.' . $var . 'year'};
1735: my $min = 0;
1736: my $hour = 0;
1737: if ($self->{'hoursminutes'}) {
1738: $min = $env{'form.' . $var . 'minute'};
1739: $hour = $env{'form.' . $var . 'hour'};
1740: }
1741:
1742: my $chosenDate;
1743: eval {$chosenDate = Time::Local::timelocal(0, $min, $hour, $day, $month, $year);};
1744: my $error = $@;
1745:
1746: # Check to make sure that the date was not automatically co-erced into a
1747: # valid date, as we want to flag that as an error
1748: # This happens for "Feb. 31", for instance, which is coerced to March 2 or
1749: # 3, depending on if it's a leap year
1750: my $checkDate = localtime($chosenDate);
1751:
1752: if ($error || $checkDate->mon != $month || $checkDate->mday != $day ||
1753: $checkDate->year + 1900 != $year) {
1754: unless (Apache::lonlocal::current_language()== ~/^en/) {
1755: $self->{ERROR_MSG} = &mt("Invalid date entry");
1756: return 0;
1757: }
1758: # LOCALIZATION FIXME: Needs to be parameterized
1759: $self->{ERROR_MSG} = "Can't use " . $months[$month] . " $day, $year as a "
1760: . "date because it doesn't exist. Please enter a valid date.";
1761:
1762: return 0;
1763: }
1764: $helper->{VARS}->{$var} = $chosenDate;
1765: }
1766:
1767: if (defined($self->{VALIDATOR})) {
1768: my $validator = eval($self->{VALIDATOR});
1769: die 'Died during evaluation of validator code; Perl said: ' . $@ if $@;
1770: my $invalid = &$validator($helper, $state, $self, $self->getValue());
1771: if ($invalid) {
1772: $self->{ERROR_MSG} = $invalid;
1773: return 0;
1774: }
1775: }
1776:
1777: if (defined($self->{NEXTSTATE})) {
1778: $helper->changeState($self->{NEXTSTATE});
1779: }
1780:
1781: return 1;
1782: }
1783: 1;
1784:
1785: package Apache::lonhelper::resource;
1786:
1787: =pod
1788:
1789: =head2 Element: resourceX<resource, helper element>
1790:
1791: <resource> elements allow the user to select one or multiple resources
1792: from the current course. You can filter out which resources they can view,
1793: and filter out which resources they can select. The course will always
1794: be displayed fully expanded, because of the difficulty of maintaining
1795: selections across folder openings and closings. If this is fixed, then
1796: the user can manipulate the folders.
1797:
1798: <resource> takes the standard variable attribute to control what helper
1799: variable stores the results. It also takes a "multichoice"X<multichoice> attribute,
1800: which controls whether the user can select more then one resource. The
1801: "toponly" attribute controls whether the resource display shows just the
1802: resources in that sequence, or recurses into all sub-sequences, defaulting
1803: to false. The "suppressEmptySequences" attribute reflects the
1804: suppressEmptySequences argument to the render routine, which will cause
1805: folders that have all of their contained resources filtered out to also
1806: be filtered out. The 'addstatus' attribute, if true, will add the icon
1807: and long status display columns to the display. The 'addparts'
1808: attribute will add in a part selector beside problems that have more
1809: than 1 part.
1810:
1811: =head3 SUB-TAGS
1812:
1813: =over 4
1814:
1815: =item * <filterfunc>X<filterfunc>: If you want to filter what resources are displayed
1816: to the user, use a filter func. The <filterfunc> tag should contain
1817: Perl code that when wrapped with "sub { my $res = shift; " and "}" is
1818: a function that returns true if the resource should be displayed,
1819: and false if it should be skipped. $res is a resource object.
1820: (See Apache::lonnavmaps documentation for information about the
1821: resource object.)
1822:
1823: =item * <choicefunc>X<choicefunc>: Same as <filterfunc>, except that controls whether
1824: the given resource can be chosen. (It is almost always a good idea to
1825: show the user the folders, for instance, but you do not always want to
1826: let the user select them.)
1827:
1828: =item * <nextstate>: Standard nextstate behavior.
1829:
1830: =item * <valuefunc>X<valuefunc>: This function controls what is returned by the resource
1831: when the user selects it. Like filterfunc and choicefunc, it should be
1832: a function fragment that when wrapped by "sub { my $res = shift; " and
1833: "}" returns a string representing what you want to have as the value. By
1834: default, the value will be the resource ID of the object ($res->{ID}).
1835:
1836: =item * <mapurl>X<mapurl>: If the URL of a map is given here, only that map
1837: will be displayed, instead of the whole course. If the attribute
1838: "evaluate" is given and is true, the contents of the mapurl will be
1839: evaluated with "sub { my $helper = shift; my $state = shift;" and
1840: "}", with the return value used as the mapurl.
1841:
1842: =back
1843:
1844: =cut
1845:
1846: no strict;
1847: @ISA = ("Apache::lonhelper::element");
1848: use strict;
1849: use Apache::lonnet;
1850:
1851: BEGIN {
1852: &Apache::lonhelper::register('Apache::lonhelper::resource',
1853: ('resource', 'filterfunc',
1854: 'choicefunc', 'valuefunc',
1855: 'mapurl','option'));
1856: }
1857:
1858: sub new {
1859: my $ref = Apache::lonhelper::element->new();
1860: bless($ref);
1861: }
1862:
1863: # CONSTRUCTION: Construct the message element from the XML
1864: sub start_resource {
1865: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1866:
1867: if ($target ne 'helper') {
1868: return '';
1869: }
1870:
1871: $paramHash->{'variable'} = $token->[2]{'variable'};
1872: $helper->declareVar($paramHash->{'variable'});
1873: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
1874: $paramHash->{'suppressEmptySequences'} = $token->[2]{'suppressEmptySequences'};
1875: $paramHash->{'toponly'} = $token->[2]{'toponly'};
1876: $paramHash->{'addstatus'} = $token->[2]{'addstatus'};
1877: $paramHash->{'addparts'} = $token->[2]{'addparts'};
1878: if ($paramHash->{'addparts'}) {
1879: $helper->declareVar($paramHash->{'variable'}.'_part');
1880: }
1881: $paramHash->{'closeallpages'} = $token->[2]{'closeallpages'};
1882: return '';
1883: }
1884:
1885: sub end_resource {
1886: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1887:
1888: if ($target ne 'helper') {
1889: return '';
1890: }
1891: if (!defined($paramHash->{FILTER_FUNC})) {
1892: $paramHash->{FILTER_FUNC} = sub {return 1;};
1893: }
1894: if (!defined($paramHash->{CHOICE_FUNC})) {
1895: $paramHash->{CHOICE_FUNC} = sub {return 1;};
1896: }
1897: if (!defined($paramHash->{VALUE_FUNC})) {
1898: $paramHash->{VALUE_FUNC} = sub {my $res = shift; return $res->{ID}; };
1899: }
1900: Apache::lonhelper::resource->new();
1901: return '';
1902: }
1903:
1904: sub start_filterfunc {
1905: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1906:
1907: if ($target ne 'helper') {
1908: return '';
1909: }
1910:
1911: my $contents = Apache::lonxml::get_all_text('/filterfunc',
1912: $parser);
1913: $contents = 'sub { my $res = shift; ' . $contents . '}';
1914: $paramHash->{FILTER_FUNC} = eval $contents;
1915: }
1916:
1917: sub end_filterfunc { return ''; }
1918:
1919: sub start_choicefunc {
1920: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1921:
1922: if ($target ne 'helper') {
1923: return '';
1924: }
1925:
1926: my $contents = Apache::lonxml::get_all_text('/choicefunc',
1927: $parser);
1928: $contents = 'sub { my $res = shift; ' . $contents . '}';
1929: $paramHash->{CHOICE_FUNC} = eval $contents;
1930: }
1931:
1932: sub end_choicefunc { return ''; }
1933:
1934: sub start_valuefunc {
1935: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1936:
1937: if ($target ne 'helper') {
1938: return '';
1939: }
1940:
1941: my $contents = Apache::lonxml::get_all_text('/valuefunc',
1942: $parser);
1943: $contents = 'sub { my $res = shift; ' . $contents . '}';
1944: $paramHash->{VALUE_FUNC} = eval $contents;
1945: }
1946:
1947: sub end_valuefunc { return ''; }
1948:
1949: sub start_mapurl {
1950: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1951:
1952: if ($target ne 'helper') {
1953: return '';
1954: }
1955:
1956: my $contents = Apache::lonxml::get_all_text('/mapurl',
1957: $parser);
1958: $paramHash->{EVAL_MAP_URL} = $token->[2]{'evaluate'};
1959: $paramHash->{MAP_URL} = $contents;
1960: }
1961:
1962: sub end_mapurl { return ''; }
1963:
1964:
1965: sub start_option {
1966: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1967: if (!defined($paramHash->{OPTION_TEXTS})) {
1968: $paramHash->{OPTION_TEXTS} = [ ];
1969: $paramHash->{OPTION_VARS} = [ ];
1970:
1971: }
1972: # OPTION_TEXTS is a list of the text attribute
1973: # values used to create column headings.
1974: # OPTION_VARS is a list of the variable names, used to create the checkbox
1975: # inputs.
1976: # We're ok with empty elements. as place holders
1977: # Although the 'variable' element should really exist.
1978: #
1979:
1980: my $option_texts = $paramHash->{OPTION_TEXTS};
1981: my $option_vars = $paramHash->{OPTION_VARS};
1982: push(@$option_texts, $token->[2]{'text'});
1983: push(@$option_vars, $token->[2]{'variable'});
1984:
1985: # Need to create and declare the option variables as well to make them
1986: # persistent.
1987: #
1988: my $varname = $token->[2]{'variable'};
1989: $helper->declareVar($varname);
1990:
1991:
1992: return '';
1993: }
1994:
1995: sub end_option {
1996: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1997: return '';
1998: }
1999:
2000: # A note, in case I don't get to this before I leave.
2001: # If someone complains about the "Back" button returning them
2002: # to the previous folder state, instead of returning them to
2003: # the previous helper state, the *correct* answer is for the helper
2004: # to keep track of how many times the user has manipulated the folders,
2005: # and feed that to the history.go() call in the helper rendering routines.
2006: # If done correctly, the helper itself can keep track of how many times
2007: # it renders the same states, so it doesn't go in just this state, and
2008: # you can lean on the browser back button to make sure it all chains
2009: # correctly.
2010: # Right now, though, I'm just forcing all folders open.
2011:
2012: sub render {
2013: my $self = shift;
2014: my $result = "";
2015: my $var = $self->{'variable'};
2016: my $curVal = $helper->{VARS}->{$var};
2017:
2018: my $buttons = '';
2019:
2020: if ($self->{'multichoice'}) {
2021: $result = <<SCRIPT;
2022: <script type="text/javascript">
2023: // <!--
2024: function checkall(value, checkName) {
2025: for (i=0; i<document.forms.helpform.elements.length; i++) {
2026: ele = document.forms.helpform.elements[i];
2027: if (ele.name == checkName + '.forminput') {
2028: document.forms.helpform.elements[i].checked=value;
2029: }
2030: }
2031: }
2032: // -->
2033: </script>
2034: SCRIPT
2035: my %lt=&Apache::lonlocal::texthash(
2036: 'sar' => "Select All Resources",
2037: 'uar' => "Unselect All Resources");
2038:
2039: $buttons = <<BUTTONS;
2040: <br />
2041: <input type="button" onclick="checkall(true, '$var')" value="$lt{'sar'}" />
2042: <input type="button" onclick="checkall(false, '$var')" value="$lt{'uar'}" />
2043: <br />
2044: BUTTONS
2045: }
2046:
2047: if (defined $self->{ERROR_MSG}) {
2048: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
2049: }
2050:
2051: $result .= $buttons;
2052:
2053: my $filterFunc = $self->{FILTER_FUNC};
2054: my $choiceFunc = $self->{CHOICE_FUNC};
2055: my $valueFunc = $self->{VALUE_FUNC};
2056: my $multichoice = $self->{'multichoice'};
2057: my $option_vars = $self->{OPTION_VARS};
2058: my $option_texts = $self->{OPTION_TEXTS};
2059: my $addparts = $self->{'addparts'};
2060: my $headings_done = 0;
2061:
2062: # Evaluate the map url as needed
2063: my $mapUrl;
2064: if ($self->{EVAL_MAP_URL}) {
2065: my $mapUrlFunc = eval('sub { my $helper = shift; my $state = shift; ' .
2066: $self->{MAP_URL} . '}');
2067: $mapUrl = &$mapUrlFunc($helper, $self);
2068: } else {
2069: $mapUrl = $self->{MAP_URL};
2070: }
2071:
2072: my %defaultSymbs;
2073: if (defined($self->{DEFAULT_VALUE})) {
2074: my $valueFunc = eval($self->{DEFAULT_VALUE});
2075: die 'Error in default value code for variable ' .
2076: $self->{'variable'} . ', Perl said: ' . $@ if $@;
2077: my @defaultSymbs = &$valueFunc($helper, $self);
2078: if (!$multichoice && @defaultSymbs) { # only allowed 1
2079: @defaultSymbs = ($defaultSymbs[0]);
2080: }
2081: %defaultSymbs = map { if ($_) {($_,1) } } @defaultSymbs;
2082: delete($defaultSymbs{''});
2083: }
2084:
2085: # Create the composite function that renders the column on the nav map
2086: # have to admit any language that lets me do this can't be all bad
2087: # - Jeremy (Pythonista) ;-)
2088: my $checked = 0;
2089: my $renderColFunc = sub {
2090: my ($resource, $part, $params) = @_;
2091: my $result = "";
2092:
2093: if(!$headings_done) {
2094: if ($option_texts) {
2095: foreach my $text (@$option_texts) {
2096: $result .= "<th>$text</th>";
2097: }
2098: }
2099: $result .= "<th>Select</th>";
2100: $result .= "</tr><tr>"; # Close off the extra row and start a new one.
2101: $headings_done = 1;
2102: }
2103:
2104: my $inputType;
2105: if ($multichoice) { $inputType = 'checkbox'; }
2106: else {$inputType = 'radio'; }
2107:
2108: if (!&$choiceFunc($resource)) {
2109: $result .= '<td> </td>';
2110: return $result;
2111: } else {
2112: my $col = "";
2113: my $raw_name = &$valueFunc($resource);
2114: my $resource_name =
2115: HTML::Entities::encode($raw_name,"<>&\"'");
2116: if($option_vars) {
2117: foreach my $option_var (@$option_vars) {
2118: my $var_value = "\|\|\|" . $helper->{VARS}->{$option_var} .
2119: "\|\|\|";
2120: my $checked ="";
2121: if($var_value =~ /\Q|||$raw_name|||\E/) {
2122: $checked = "checked='checked'";
2123: }
2124: $col .=
2125: "<td align='center'><input type='checkbox' name ='$option_var".
2126: ".forminput' value='".
2127: $resource_name . "' $checked /> </td>";
2128: }
2129: }
2130:
2131: $col .= "<td align='center'><input type='$inputType' name='${var}.forminput' ";
2132: if (%defaultSymbs) {
2133: my $symb=$resource->symb();
2134: if (exists($defaultSymbs{$symb})) {
2135: $col .= "checked='checked' ";
2136: $checked = 1;
2137: }
2138: } else {
2139: if (!$checked && !$multichoice) {
2140: $col .= "checked='checked' ";
2141: $checked = 1;
2142: }
2143: if ($multichoice) { # all resources start checked; see bug 1174
2144: $col .= "checked='checked' ";
2145: $checked = 1;
2146: }
2147: }
2148: $col .= "value='" . $resource_name . "' /></td>";
2149:
2150: return $result.$col;
2151: }
2152: };
2153: my $renderPartsFunc = sub {
2154: my ($resource, $part, $params) = @_;
2155: my $col= "<td>";
2156: my $id=$resource->{ID};
2157: my $resource_name =
2158: &HTML::Entities::encode(&$valueFunc($resource),"<>&\"'");
2159: if ($addparts && (scalar(@{$resource->parts}) > 1)) {
2160: $col .= "<select onclick=\"javascript:updateRadio(this.form,'${var}.forminput','$resource_name');updateHidden(this.form,'$id','${var}');\" name='part_$id.forminput'>\n";
2161: $col .= "<option value=\"$part\">All Parts</option>\n";
2162: foreach my $part (@{$resource->parts}) {
2163: $col .= "<option value=\"$part\">Part: $part</option>\n";
2164: }
2165: $col .= "</select>";
2166: }
2167: $col .= "</td>";
2168: };
2169: $result.=(<<RADIO);
2170: <script type="text/javascript">
2171: // <!--
2172: function updateRadio(form,name,value) {
2173: var radiobutton=form[name];
2174: for (var i=0; i<radiobutton.length; i++) {
2175: if (radiobutton[i].value == value) {
2176: radiobutton[i].checked = true;
2177: break;
2178: }
2179: }
2180: }
2181: function updateHidden(form,id,name) {
2182: var select=form['part_'+id+'.forminput'];
2183: var hidden=form[name+'_part.forminput'];
2184: var which=select.selectedIndex;
2185: hidden.value=select.options[which].value;
2186: }
2187: // -->
2188: </script>
2189: <input type="hidden" name="${var}_part.forminput" />
2190:
2191: RADIO
2192: $env{'form.condition'} = !$self->{'toponly'};
2193: my $cols = [$renderColFunc];
2194: if ($self->{'addparts'}) { push(@$cols, $renderPartsFunc); }
2195: push(@$cols, Apache::lonnavmaps::resource());
2196: if ($self->{'addstatus'}) {
2197: push @$cols, (Apache::lonnavmaps::part_status_summary());
2198:
2199: }
2200: $result .=
2201: &Apache::lonnavmaps::render( { 'cols' => $cols,
2202: 'showParts' => 0,
2203: 'filterFunc' => $filterFunc,
2204: 'resource_no_folder_link' => 1,
2205: 'closeAllPages' => $self->{'closeallpages'},
2206: 'suppressEmptySequences' => $self->{'suppressEmptySequences'},
2207: 'iterator_map' => $mapUrl }
2208: );
2209:
2210: $result .= $buttons;
2211:
2212: return $result;
2213: }
2214:
2215: sub postprocess {
2216: my $self = shift;
2217:
2218: if ($self->{'multichoice'} && !$helper->{VARS}->{$self->{'variable'}}) {
2219: $self->{ERROR_MSG} = 'You must choose at least one resource to continue.';
2220: return 0;
2221: }
2222:
2223: if (defined($self->{NEXTSTATE})) {
2224: $helper->changeState($self->{NEXTSTATE});
2225: }
2226:
2227: return 1;
2228: }
2229:
2230: 1;
2231:
2232: package Apache::lonhelper::student;
2233:
2234: =pod
2235:
2236: =head2 Element: studentX<student, helper element>
2237:
2238: Student elements display a choice of students enrolled in the current
2239: course. Currently it is primitive; this is expected to evolve later.
2240:
2241: Student elements take the following attributes:
2242:
2243: =over 4
2244:
2245: =item * B<variable>:
2246:
2247: Does what it usually does: declare which helper variable to put the
2248: result in.
2249:
2250: =item * B<multichoice>:
2251:
2252: If true allows the user to select multiple students. Defaults to false.
2253:
2254: =item * B<coursepersonnel>:
2255:
2256: If true adds the course personnel to the top of the student
2257: selection. Defaults to false.
2258:
2259: =item * B<activeonly>:
2260:
2261: If true, only active students and course personnel will be
2262: shown. Defaults to false.
2263:
2264: =item * B<emptyallowed>:
2265:
2266: If true, the selection of no users is allowed. Defaults to false.
2267:
2268: =back
2269:
2270: =cut
2271:
2272: no strict;
2273: @ISA = ("Apache::lonhelper::element");
2274: use strict;
2275: use Apache::lonlocal;
2276: use Apache::lonnet;
2277:
2278: BEGIN {
2279: &Apache::lonhelper::register('Apache::lonhelper::student',
2280: ('student'));
2281: }
2282:
2283: sub new {
2284: my $ref = Apache::lonhelper::element->new();
2285: bless($ref);
2286: }
2287:
2288: sub start_student {
2289: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2290:
2291: if ($target ne 'helper') {
2292: return '';
2293: }
2294:
2295: $paramHash->{'variable'} = $token->[2]{'variable'};
2296: $helper->declareVar($paramHash->{'variable'});
2297: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
2298: $paramHash->{'coursepersonnel'} = $token->[2]{'coursepersonnel'};
2299: $paramHash->{'activeonly'} = $token->[2]{'activeonly'};
2300: if (defined($token->[2]{'nextstate'})) {
2301: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
2302: }
2303: $paramHash->{'emptyallowed'} = $token->[2]{'emptyallowed'};
2304:
2305: }
2306:
2307: sub end_student {
2308: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2309:
2310: if ($target ne 'helper') {
2311: return '';
2312: }
2313: Apache::lonhelper::student->new();
2314: }
2315:
2316: sub render {
2317: my $self = shift;
2318: my $result = '';
2319: my $buttons = '';
2320: my $var = $self->{'variable'};
2321:
2322:
2323: if (defined $self->{ERROR_MSG}) {
2324: $result .= '<font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
2325: }
2326:
2327: my %defaultUsers;
2328: if (defined($self->{DEFAULT_VALUE})) {
2329: my $valueFunc = eval($self->{DEFAULT_VALUE});
2330: die 'Error in default value code for variable ' .
2331: $self->{'variable'} . ', Perl said: ' . $@ if $@;
2332: my @defaultUsers = &$valueFunc($helper, $self);
2333: if (!$self->{'multichoice'} && @defaultUsers) { # only allowed 1
2334: @defaultUsers = ($defaultUsers[0]);
2335: }
2336: %defaultUsers = map { if ($_) {($_,1) } } @defaultUsers;
2337: delete($defaultUsers{''});
2338: }
2339:
2340:
2341: my ($course_personnel,
2342: $current_members,
2343: $expired_members,
2344: $future_members) = &Apache::lonselstudent::get_people_in_class();
2345:
2346:
2347:
2348: # Load up the non-students, if necessary
2349:
2350: if ($self->{'coursepersonnel'}) {
2351: unshift @$current_members, (@$course_personnel);
2352: }
2353:
2354:
2355: # Current personel
2356:
2357: $result .= &Apache::lonselstudent::render_student_list( $current_members,
2358: "helpform",
2359: "current",
2360: \%defaultUsers,
2361: $self->{'multichoice'},
2362: $self->{'variable'},
2363: 1);
2364:
2365:
2366: # If activeonly is not set then we can also give the expired students:
2367: #
2368: if (!$self->{'activeonly'} && ((scalar @$expired_members) > 0)) {
2369:
2370: # And future.
2371:
2372: $result .= &Apache::lonselstudent::render_student_list( $future_members,
2373: "helpform",
2374: "future",
2375: \%defaultUsers,
2376: $self->{'multichoice'},
2377: $self->{'variable'},
2378: 0);
2379: # Past
2380:
2381: $result .= &Apache::lonselstudent::render_student_list($expired_members,
2382: "helpform",
2383: "past",
2384: \%defaultUsers,
2385: $self->{'multichoice'},
2386: $self->{'variable'},
2387: 0);
2388: }
2389:
2390:
2391:
2392: return $result;
2393: }
2394:
2395: sub postprocess {
2396: my $self = shift;
2397:
2398: my $result = $env{'form.' . $self->{'variable'} . '.forminput'};
2399: if (!$result && !$self->{'emptyallowed'}) {
2400: if ($self->{'coursepersonnel'}) {
2401: $self->{ERROR_MSG} =
2402: &mt('You must choose at least one user to continue.');
2403: } else {
2404: $self->{ERROR_MSG} =
2405: &mt('You must choose at least one student to continue.');
2406: }
2407: return 0;
2408: }
2409:
2410: if (defined($self->{NEXTSTATE})) {
2411: $helper->changeState($self->{NEXTSTATE});
2412: }
2413:
2414: return 1;
2415: }
2416:
2417: 1;
2418:
2419: package Apache::lonhelper::files;
2420:
2421: =pod
2422:
2423: =head2 Element: filesX<files, helper element>
2424:
2425: files allows the users to choose files from a given directory on the
2426: server. It is always multichoice and stores the result as a triple-pipe
2427: delimited entry in the helper variables.
2428:
2429: Since it is extremely unlikely that you can actually code a constant
2430: representing the directory you wish to allow the user to search, <files>
2431: takes a subroutine that returns the name of the directory you wish to
2432: have the user browse.
2433:
2434: files accepts the attribute "variable" to control where the files chosen
2435: are put. It accepts the attribute "multichoice" as the other attribute,
2436: defaulting to false, which if true will allow the user to select more
2437: then one choice.
2438:
2439: <files> accepts three subtags:
2440:
2441: =over 4
2442:
2443: =item * B<nextstate>: works as it does with the other tags.
2444:
2445: =item * B<filechoice>: When the contents of this tag are surrounded by
2446: "sub {" and "}", will return a string representing what directory
2447: on the server to allow the user to choose files from.
2448:
2449: =item * B<filefilter>: Should contain Perl code that when surrounded
2450: by "sub { my $filename = shift; " and "}", returns a true value if
2451: the user can pick that file, or false otherwise. The filename
2452: passed to the function will be just the name of the file, with no
2453: path info. By default, a filter function will be used that will
2454: mask out old versions of files. This function is available as
2455: Apache::lonhelper::files::not_old_version if you want to use it to
2456: composite your own filters.
2457:
2458: =back
2459:
2460: B<General security note>: You should ensure the user can not somehow
2461: pass something into your code that would allow them to look places
2462: they should not be able to see, like the C</etc/> directory. However,
2463: the security impact would be minimal, since it would only expose
2464: the existence of files, there should be no way to parlay that into
2465: viewing the files.
2466:
2467: =cut
2468:
2469: no strict;
2470: @ISA = ("Apache::lonhelper::element");
2471: use strict;
2472: use Apache::lonlocal;
2473: use Apache::lonnet;
2474: use Apache::lonpubdir; # for getTitleString
2475:
2476: BEGIN {
2477: &Apache::lonhelper::register('Apache::lonhelper::files',
2478: ('files', 'filechoice', 'filefilter'));
2479: }
2480:
2481: sub not_old_version {
2482: my $file = shift;
2483:
2484: # Given a file name, return false if it is an "old version" of a
2485: # file, or true if it is not.
2486:
2487: if ($file =~ /^.*\.[0-9]+\.[A-Za-z]+(\.meta)?$/) {
2488: return 0;
2489: }
2490: return 1;
2491: }
2492:
2493: sub new {
2494: my $ref = Apache::lonhelper::element->new();
2495: bless($ref);
2496: }
2497:
2498: sub start_files {
2499: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2500:
2501: if ($target ne 'helper') {
2502: return '';
2503: }
2504: $paramHash->{'variable'} = $token->[2]{'variable'};
2505: $helper->declareVar($paramHash->{'variable'});
2506: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
2507: }
2508:
2509: sub end_files {
2510: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2511:
2512: if ($target ne 'helper') {
2513: return '';
2514: }
2515: if (!defined($paramHash->{FILTER_FUNC})) {
2516: $paramHash->{FILTER_FUNC} = sub { return 1; };
2517: }
2518: Apache::lonhelper::files->new();
2519: }
2520:
2521: sub start_filechoice {
2522: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2523:
2524: if ($target ne 'helper') {
2525: return '';
2526: }
2527: $paramHash->{'filechoice'} = Apache::lonxml::get_all_text('/filechoice',
2528: $parser);
2529: }
2530:
2531: sub end_filechoice { return ''; }
2532:
2533: sub start_filefilter {
2534: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2535:
2536: if ($target ne 'helper') {
2537: return '';
2538: }
2539:
2540: my $contents = Apache::lonxml::get_all_text('/filefilter',
2541: $parser);
2542: $contents = 'sub { my $filename = shift; ' . $contents . '}';
2543: $paramHash->{FILTER_FUNC} = eval $contents;
2544: }
2545:
2546: sub end_filefilter { return ''; }
2547:
2548: {
2549: # used to generate unique id attributes for <input> tags.
2550: # internal use only.
2551: my $id=0;
2552: sub new_id { return $id++;}
2553: }
2554:
2555: sub render {
2556: my $self = shift;
2557: my $result = '';
2558: my $var = $self->{'variable'};
2559:
2560: my $subdirFunc = eval('sub {' . $self->{'filechoice'} . '}');
2561: die 'Error in resource filter code for variable ' .
2562: {'variable'} . ', Perl said:' . $@ if $@;
2563:
2564: my $subdir = &$subdirFunc();
2565:
2566: my $filterFunc = $self->{FILTER_FUNC};
2567: if (!defined($filterFunc)) {
2568: $filterFunc = ¬_old_version;
2569: }
2570: my $buttons = '';
2571: my $type = 'radio';
2572: if ($self->{'multichoice'}) {
2573: $type = 'checkbox';
2574: }
2575:
2576: if ($self->{'multichoice'}) {
2577: $result = <<SCRIPT;
2578: <script type="text/javascript">
2579: // <!--
2580: function checkall(value, checkName) {
2581: for (i=0; i<document.forms.helpform.elements.length; i++) {
2582: ele = document.forms.helpform.elements[i];
2583: if (ele.name == checkName + '.forminput') {
2584: document.forms.helpform.elements[i].checked=value;
2585: }
2586: }
2587: }
2588:
2589: function checkallclass(value, className) {
2590: for (i=0; i<document.forms.helpform.elements.length; i++) {
2591: ele = document.forms.helpform.elements[i];
2592: if (ele.type == "$type" && ele.onclick) {
2593: document.forms.helpform.elements[i].checked=value;
2594: }
2595: }
2596: }
2597: // -->
2598: </script>
2599: SCRIPT
2600: my %lt=&Apache::lonlocal::texthash(
2601: 'saf' => "Select All Files",
2602: 'uaf' => "Unselect All Files");
2603: $buttons = <<BUTTONS;
2604: <br />
2605: <input type="button" onclick="checkall(true, '$var')" value="$lt{'saf'}" />
2606: <input type="button" onclick="checkall(false, '$var')" value="$lt{'uaf'}" />
2607: BUTTONS
2608:
2609: %lt=&Apache::lonlocal::texthash(
2610: 'sap' => "Select All Published",
2611: 'uap' => "Unselect All Published");
2612: if ($helper->{VARS}->{'construction'}) {
2613: $buttons .= <<BUTTONS;
2614: <input type="button" onclick="checkallclass(true, 'Published')" value="$lt{'sap'}" />
2615: <input type="button" onclick="checkallclass(false, 'Published')" value="$lt{'uap'}" />
2616: <br />
2617: BUTTONS
2618: }
2619: }
2620:
2621: # Get the list of files in this directory.
2622: my @fileList;
2623:
2624: # If the subdirectory is in local CSTR space
2625: my $metadir;
2626: if ($subdir =~ m|/home/([^/]+)/public_html/(.*)|) {
2627: my ($user,$domain)=
2628: &Apache::loncacc::constructaccess($subdir,
2629: $Apache::lonnet::perlvar{'lonDefDomain'});
2630: $metadir='/res/'.$domain.'/'.$user.'/'.$2;
2631: @fileList = &Apache::lonnet::dirlist($subdir, $domain, $user, '');
2632: } elsif ($subdir =~ m|^~([^/]+)/(.*)$|) {
2633: $subdir='/home/'.$1.'/public_html/'.$2;
2634: my ($user,$domain)=
2635: &Apache::loncacc::constructaccess($subdir,
2636: $Apache::lonnet::perlvar{'lonDefDomain'});
2637: $metadir='/res/'.$domain.'/'.$user.'/'.$2;
2638: @fileList = &Apache::lonnet::dirlist($subdir, $domain, $user, '');
2639: } else {
2640: # local library server resource space
2641: @fileList = &Apache::lonnet::dirlist($subdir, $env{'user.domain'}, $env{'user.name'}, '');
2642: }
2643:
2644: # Sort the fileList into order
2645: @fileList = sort {lc($a) cmp lc($b)} @fileList;
2646:
2647: $result .= $buttons;
2648:
2649: if (defined $self->{ERROR_MSG}) {
2650: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
2651: }
2652:
2653: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
2654:
2655: # Keeps track if there are no choices, prints appropriate error
2656: # if there are none.
2657: my $choices = 0;
2658: # Print each legitimate file choice.
2659: for my $file (@fileList) {
2660: $file = (split(/&/, $file))[0];
2661: if ($file eq '.' || $file eq '..') {
2662: next;
2663: }
2664: my $fileName = $subdir .'/'. $file;
2665: if (&$filterFunc($file)) {
2666: my $status;
2667: my $color;
2668: if ($helper->{VARS}->{'construction'}) {
2669: ($status, $color) = @{fileState($subdir, $file)};
2670: } else {
2671: $status = '';
2672: $color = '';
2673: }
2674:
2675: # Get the title
2676: my $title = Apache::lonpubdir::getTitleString(($metadir?$metadir:$subdir) .'/'. $file);
2677:
2678: # Netscape 4 is stupid and there's nowhere to put the
2679: # information on the input tag that the file is Published,
2680: # Unpublished, etc. In *real* browsers we can just say
2681: # "class='Published'" and check the className attribute of
2682: # the input tag, but Netscape 4 is too stupid to understand
2683: # that attribute, and un-comprehended attributes are not
2684: # reflected into the object model. So instead, what I do
2685: # is either have or don't have an "onclick" handler that
2686: # does nothing, give Published files the onclick handler, and
2687: # have the checker scripts check for that. Stupid and clumsy,
2688: # and only gives us binary "yes/no" information (at least I
2689: # couldn't figure out how to reach into the event handler's
2690: # actual code to retreive a value), but it works well enough
2691: # here.
2692:
2693: my $onclick = '';
2694: if ($status eq 'Published' && $helper->{VARS}->{'construction'}) {
2695: $onclick = 'onclick="a=1" ';
2696: }
2697: my $id = &new_id();
2698: $result .= '<tr><td align="right"' . " bgcolor='$color'>" .
2699: "<input $onclick type='$type' name='" . $var
2700: . ".forminput' ".qq{id="$id"}." value='" . HTML::Entities::encode($fileName,"<>&\"'").
2701: "'";
2702: if (!$self->{'multichoice'} && $choices == 0) {
2703: $result .= ' checked="checked"';
2704: }
2705: $result .= "/></td><td bgcolor='$color'>".
2706: qq{<label for="$id">}. $file . "</label></td>" .
2707: "<td bgcolor='$color'>$title</td>" .
2708: "<td bgcolor='$color'>$status</td>" . "</tr>\n";
2709: $choices++;
2710: }
2711: }
2712:
2713: $result .= "</table>\n";
2714:
2715: if (!$choices) {
2716: $result .= '<font color="#FF0000">There are no files available to select in this directory ('.$subdir.'). Please go back and select another option.</font><br /><br />';
2717: }
2718:
2719: $result .= $buttons;
2720:
2721: return $result;
2722: }
2723:
2724: # Determine the state of the file: Published, unpublished, modified.
2725: # Return the color it should be in and a label as a two-element array
2726: # reference.
2727: # Logic lifted from lonpubdir.pm, even though I don't know that it's still
2728: # the most right thing to do.
2729:
2730: sub fileState {
2731: my $constructionSpaceDir = shift;
2732: my $file = shift;
2733:
2734: my ($uname,$udom)=($env{'user.name'},$env{'user.domain'});
2735: if ($env{'request.role'}=~/^ca\./) {
2736: (undef,$udom,$uname)=split(/\//,$env{'request.role'});
2737: }
2738: my $docroot = $Apache::lonnet::perlvar{'lonDocRoot'};
2739: my $subdirpart = $constructionSpaceDir;
2740: $subdirpart =~ s/^\/home\/$uname\/public_html//;
2741: my $resdir = $docroot . '/res/' . $udom . '/' . $uname .
2742: $subdirpart;
2743:
2744: my @constructionSpaceFileStat = stat($constructionSpaceDir . '/' . $file);
2745: my @resourceSpaceFileStat = stat($resdir . '/' . $file);
2746: if (!@resourceSpaceFileStat) {
2747: return ['Unpublished', '#FFCCCC'];
2748: }
2749:
2750: my $constructionSpaceFileModified = $constructionSpaceFileStat[9];
2751: my $resourceSpaceFileModified = $resourceSpaceFileStat[9];
2752:
2753: if ($constructionSpaceFileModified > $resourceSpaceFileModified) {
2754: return ['Modified', '#FFFFCC'];
2755: }
2756: return ['Published', '#CCFFCC'];
2757: }
2758:
2759: sub postprocess {
2760: my $self = shift;
2761: my $result = $env{'form.' . $self->{'variable'} . '.forminput'};
2762: if (!$result) {
2763: $self->{ERROR_MSG} = 'You must choose at least one file '.
2764: 'to continue.';
2765: return 0;
2766: }
2767:
2768: if (defined($self->{NEXTSTATE})) {
2769: $helper->changeState($self->{NEXTSTATE});
2770: }
2771:
2772: return 1;
2773: }
2774:
2775: 1;
2776:
2777: package Apache::lonhelper::section;
2778:
2779: =pod
2780:
2781: =head2 Element: sectionX<section, helper element>
2782:
2783: <section> allows the user to choose one or more sections from the current
2784: course.
2785:
2786: It takes the standard attributes "variable", "multichoice",
2787: "allowempty" and "nextstate", meaning what they do for most other
2788: elements.
2789:
2790: also takes a boolean 'onlysections' whcih will restrict this to only
2791: have sections and not include groups
2792:
2793: =cut
2794:
2795: no strict;
2796: @ISA = ("Apache::lonhelper::choices");
2797: use strict;
2798:
2799: BEGIN {
2800: &Apache::lonhelper::register('Apache::lonhelper::section',
2801: ('section'));
2802: }
2803:
2804: sub new {
2805: my $ref = Apache::lonhelper::choices->new();
2806: bless($ref);
2807: }
2808:
2809: sub start_section {
2810: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2811:
2812: if ($target ne 'helper') {
2813: return '';
2814: }
2815:
2816: $paramHash->{CHOICES} = [];
2817:
2818: $paramHash->{'variable'} = $token->[2]{'variable'};
2819: $helper->declareVar($paramHash->{'variable'});
2820: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
2821: $paramHash->{'allowempty'} = $token->[2]{'allowempty'};
2822: if (defined($token->[2]{'nextstate'})) {
2823: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
2824: }
2825:
2826: # Populate the CHOICES element
2827: my %choices;
2828:
2829: my $section = Apache::loncoursedata::CL_SECTION();
2830: my $classlist = Apache::loncoursedata::get_classlist();
2831: foreach my $user (keys(%$classlist)) {
2832: my $section_name = $classlist->{$user}[$section];
2833: if (!$section_name) {
2834: $choices{"No section assigned"} = "";
2835: } else {
2836: $choices{$section_name} = $section_name;
2837: }
2838: }
2839:
2840: if (exists($choices{"No section assigned"})) {
2841: push(@{$paramHash->{CHOICES}},
2842: ['No section assigned','No section assigned']);
2843: delete($choices{"No section assigned"});
2844: }
2845: for my $section_name (sort {lc($a) cmp lc($b) } (keys(%choices))) {
2846: push @{$paramHash->{CHOICES}}, [$section_name, $section_name];
2847: }
2848: return if ($token->[2]{'onlysections'});
2849:
2850: # add in groups to the end of the list
2851: my %curr_groups = &Apache::loncommon::coursegroups();
2852: foreach my $group_name (sort(keys(%curr_groups))) {
2853: push(@{$paramHash->{CHOICES}}, [$group_name, $group_name]);
2854: }
2855: }
2856:
2857: sub end_section {
2858: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2859:
2860: if ($target ne 'helper') {
2861: return '';
2862: }
2863: Apache::lonhelper::section->new();
2864: }
2865: 1;
2866:
2867: package Apache::lonhelper::group;
2868:
2869: =pod
2870:
2871: =head2 Element: groupX<group, helper element>
2872:
2873: <group> allows the user to choose one or more groups from the current course.
2874:
2875: It takes the standard attributes "variable", "multichoice",
2876: "allowempty" and "nextstate", meaning what they do for most other
2877: elements.
2878:
2879: =cut
2880:
2881: no strict;
2882: @ISA = ("Apache::lonhelper::choices");
2883: use strict;
2884:
2885: BEGIN {
2886: &Apache::lonhelper::register('Apache::lonhelper::group',
2887: ('group'));
2888: }
2889:
2890: sub new {
2891: my $ref = Apache::lonhelper::choices->new();
2892: bless($ref);
2893: }
2894:
2895: sub start_group {
2896: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2897:
2898: if ($target ne 'helper') {
2899: return '';
2900: }
2901:
2902: $paramHash->{CHOICES} = [];
2903:
2904: $paramHash->{'variable'} = $token->[2]{'variable'};
2905: $helper->declareVar($paramHash->{'variable'});
2906: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
2907: $paramHash->{'allowempty'} = $token->[2]{'allowempty'};
2908: if (defined($token->[2]{'nextstate'})) {
2909: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
2910: }
2911:
2912: # Populate the CHOICES element
2913: my %choices;
2914:
2915: my %curr_groups = &Apache::loncommon::coursegroups();
2916: foreach my $group_name (sort {lc($a) cmp lc($b)} (keys(%curr_groups))) {
2917: push(@{$paramHash->{CHOICES}}, [$group_name, $group_name]);
2918: }
2919: }
2920:
2921: sub end_group {
2922: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2923:
2924: if ($target ne 'helper') {
2925: return '';
2926: }
2927: Apache::lonhelper::group->new();
2928: }
2929: 1;
2930:
2931: package Apache::lonhelper::string;
2932:
2933: =pod
2934:
2935: =head2 Element: stringX<string, helper element>
2936:
2937: string elements provide a string entry field for the user. string elements
2938: take the usual 'variable' and 'nextstate' parameters. string elements
2939: also pass through 'maxlength' and 'size' attributes to the input tag.
2940:
2941: string honors the defaultvalue tag, if given.
2942:
2943: string honors the validation function, if given.
2944:
2945: =cut
2946:
2947: no strict;
2948: @ISA = ("Apache::lonhelper::element");
2949: use strict;
2950: use Apache::lonlocal;
2951:
2952: BEGIN {
2953: &Apache::lonhelper::register('Apache::lonhelper::string',
2954: ('string'));
2955: }
2956:
2957: sub new {
2958: my $ref = Apache::lonhelper::element->new();
2959: bless($ref);
2960: }
2961:
2962: # CONSTRUCTION: Construct the message element from the XML
2963: sub start_string {
2964: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2965:
2966: if ($target ne 'helper') {
2967: return '';
2968: }
2969:
2970: $paramHash->{'variable'} = $token->[2]{'variable'};
2971: $helper->declareVar($paramHash->{'variable'});
2972: $paramHash->{'nextstate'} = $token->[2]{'nextstate'};
2973: $paramHash->{'maxlength'} = $token->[2]{'maxlength'};
2974: $paramHash->{'size'} = $token->[2]{'size'};
2975:
2976: return '';
2977: }
2978:
2979: sub end_string {
2980: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2981:
2982: if ($target ne 'helper') {
2983: return '';
2984: }
2985: Apache::lonhelper::string->new();
2986: return '';
2987: }
2988:
2989: sub render {
2990: my $self = shift;
2991: my $result = '';
2992:
2993: if (defined $self->{ERROR_MSG}) {
2994: $result .= '<p><font color="#FF0000">' . $self->{ERROR_MSG} . '</font></p>';
2995: }
2996:
2997: $result .= '<input type="string" name="' . $self->{'variable'} . '.forminput"';
2998:
2999: if (defined($self->{'size'})) {
3000: $result .= ' size="' . $self->{'size'} . '"';
3001: }
3002: if (defined($self->{'maxlength'})) {
3003: $result .= ' maxlength="' . $self->{'maxlength'} . '"';
3004: }
3005:
3006: if (defined($self->{DEFAULT_VALUE})) {
3007: my $valueFunc = eval($self->{DEFAULT_VALUE});
3008: die 'Error in default value code for variable ' .
3009: $self->{'variable'} . ', Perl said: ' . $@ if $@;
3010: $result .= ' value="' . &$valueFunc($helper, $self) . '"';
3011: }
3012:
3013: $result .= ' />';
3014:
3015: return $result;
3016: }
3017:
3018: # If a NEXTSTATE was given, switch to it
3019: sub postprocess {
3020: my $self = shift;
3021:
3022: if (defined($self->{VALIDATOR})) {
3023: my $validator = eval($self->{VALIDATOR});
3024: die 'Died during evaluation of validator code; Perl said: ' . $@ if $@;
3025: my $invalid = &$validator($helper, $state, $self, $self->getValue());
3026: if ($invalid) {
3027: $self->{ERROR_MSG} = $invalid;
3028: return 0;
3029: }
3030: }
3031:
3032: if (defined($self->{'nextstate'})) {
3033: $helper->changeState($self->{'nextstate'});
3034: }
3035:
3036: return 1;
3037: }
3038:
3039: 1;
3040:
3041: package Apache::lonhelper::general;
3042:
3043: =pod
3044:
3045: =head2 General-purpose tag: <exec>X<exec, helper tag>
3046:
3047: The contents of the exec tag are executed as Perl code, B<not> inside a
3048: safe space, so the full range of $env and such is available. The code
3049: will be executed as a subroutine wrapped with the following code:
3050:
3051: "sub { my $helper = shift; my $state = shift;" and
3052:
3053: "}"
3054:
3055: The return value is ignored.
3056:
3057: $helper is the helper object. Feel free to add methods to the helper
3058: object to support whatever manipulation you may need to do (for instance,
3059: overriding the form location if the state is the final state; see
3060: parameter.helper for an example).
3061:
3062: $state is the $paramHash that has currently been generated and may
3063: be manipulated by the code in exec. Note that the $state is not yet
3064: an actual state B<object>, it is just a hash, so do not expect to
3065: be able to call methods on it.
3066:
3067: =cut
3068:
3069: use Apache::lonlocal;
3070: use Apache::lonnet;
3071:
3072: BEGIN {
3073: &Apache::lonhelper::register('Apache::lonhelper::general',
3074: 'exec', 'condition', 'clause',
3075: 'eval');
3076: }
3077:
3078: sub start_exec {
3079: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3080:
3081: if ($target ne 'helper') {
3082: return '';
3083: }
3084:
3085: my $code = &Apache::lonxml::get_all_text('/exec', $parser);
3086:
3087: $code = eval ('sub { my $helper = shift; my $state = shift; ' .
3088: $code . "}");
3089: die 'Error in <exec>, Perl said: '. $@ if $@;
3090: &$code($helper, $paramHash);
3091: }
3092:
3093: sub end_exec { return ''; }
3094:
3095: =pod
3096:
3097: =head2 General-purpose tag: <condition>
3098:
3099: The <condition> tag allows you to mask out parts of the helper code
3100: depending on some programatically determined condition. The condition
3101: tag contains a tag <clause> which contains perl code that when wrapped
3102: with "sub { my $helper = shift; my $state = shift; " and "}", returns
3103: a true value if the XML in the condition should be evaluated as a normal
3104: part of the helper, or false if it should be completely discarded.
3105:
3106: The <clause> tag must be the first sub-tag of the <condition> tag or
3107: it will not work as expected.
3108:
3109: =cut
3110:
3111: # The condition tag just functions as a marker, it doesn't have
3112: # to "do" anything. Technically it doesn't even have to be registered
3113: # with the lonxml code, but I leave this here to be explicit about it.
3114: sub start_condition { return ''; }
3115: sub end_condition { return ''; }
3116:
3117: sub start_clause {
3118: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3119:
3120: if ($target ne 'helper') {
3121: return '';
3122: }
3123:
3124: my $clause = Apache::lonxml::get_all_text('/clause', $parser);
3125: $clause = eval('sub { my $helper = shift; my $state = shift; '
3126: . $clause . '}');
3127: die 'Error in clause of condition, Perl said: ' . $@ if $@;
3128: if (!&$clause($helper, $paramHash)) {
3129: # Discard all text until the /condition.
3130: &Apache::lonxml::get_all_text('/condition', $parser);
3131: }
3132: }
3133:
3134: sub end_clause { return ''; }
3135:
3136: =pod
3137:
3138: =head2 General-purpose tag: <eval>X<eval, helper tag>
3139:
3140: The <eval> tag will be evaluated as a subroutine call passed in the
3141: current helper object and state hash as described in <condition> above,
3142: but is expected to return a string to be printed directly to the
3143: screen. This is useful for dynamically generating messages.
3144:
3145: =cut
3146:
3147: # This is basically a type of message.
3148: # Programmatically setting $paramHash->{NEXTSTATE} would work, though
3149: # it's probably bad form.
3150:
3151: sub start_eval {
3152: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3153:
3154: if ($target ne 'helper') {
3155: return '';
3156: }
3157:
3158: my $program = Apache::lonxml::get_all_text('/eval', $parser);
3159: $program = eval('sub { my $helper = shift; my $state = shift; '
3160: . $program . '}');
3161: die 'Error in eval code, Perl said: ' . $@ if $@;
3162: $paramHash->{MESSAGE_TEXT} = &$program($helper, $paramHash);
3163: }
3164:
3165: sub end_eval {
3166: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3167:
3168: if ($target ne 'helper') {
3169: return '';
3170: }
3171:
3172: Apache::lonhelper::message->new();
3173: }
3174:
3175: 1;
3176:
3177: package Apache::lonhelper::final;
3178:
3179: =pod
3180:
3181: =head2 Element: finalX<final, helper tag>
3182:
3183: <final> is a special element that works with helpers that use the <finalcode>
3184: tagX<finalcode, helper tag>. It goes through all the states and elements, executing the <finalcode>
3185: snippets and collecting the results. Finally, it takes the user out of the
3186: helper, going to a provided page.
3187:
3188: If the parameter "restartCourse" is true, this will override the buttons and
3189: will make a "Finish Helper" button that will re-initialize the course for them,
3190: which is useful for the Course Initialization helper so the users never see
3191: the old values taking effect.
3192:
3193: If the parameter "restartCourse" is not true a 'Finish' Button will be
3194: presented that takes the user back to whatever was defined as <exitpage>
3195:
3196: =cut
3197:
3198: no strict;
3199: @ISA = ("Apache::lonhelper::element");
3200: use strict;
3201: use Apache::lonlocal;
3202: use Apache::lonnet;
3203: BEGIN {
3204: &Apache::lonhelper::register('Apache::lonhelper::final',
3205: ('final', 'exitpage'));
3206: }
3207:
3208: sub new {
3209: my $ref = Apache::lonhelper::element->new();
3210: bless($ref);
3211: }
3212:
3213: sub start_final {
3214: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3215:
3216: if ($target ne 'helper') {
3217: return '';
3218: }
3219:
3220: $paramHash->{'restartCourse'} = $token->[2]{'restartCourse'};
3221:
3222: return '';
3223: }
3224:
3225: sub end_final {
3226: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3227:
3228: if ($target ne 'helper') {
3229: return '';
3230: }
3231:
3232: Apache::lonhelper::final->new();
3233:
3234: return '';
3235: }
3236:
3237: sub start_exitpage {
3238: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3239:
3240: if ($target ne 'helper') {
3241: return '';
3242: }
3243:
3244: $paramHash->{EXIT_PAGE} = &Apache::lonxml::get_all_text('/exitpage',
3245: $parser);
3246:
3247: return '';
3248: }
3249:
3250: sub end_exitpage { return ''; }
3251:
3252: sub render {
3253: my $self = shift;
3254:
3255: my @results;
3256:
3257: # Collect all the results
3258: for my $stateName (keys %{$helper->{STATES}}) {
3259: my $state = $helper->{STATES}->{$stateName};
3260:
3261: for my $element (@{$state->{ELEMENTS}}) {
3262: if (defined($element->{FINAL_CODE})) {
3263: # Compile the code.
3264: my $code = 'sub { my $helper = shift; my $element = shift; '
3265: . $element->{FINAL_CODE} . '}';
3266: $code = eval($code);
3267: die 'Error while executing final code for element with var ' .
3268: $element->{'variable'} . ', Perl said: ' . $@ if $@;
3269:
3270: my $result = &$code($helper, $element);
3271: if ($result) {
3272: push @results, $result;
3273: }
3274: }
3275: }
3276: }
3277:
3278: my $result;
3279:
3280: if (scalar(@results) != 0) {
3281: $result .= "<ul>\n";
3282: for my $re (@results) {
3283: $result .= ' <li>' . $re . "</li>\n";
3284: }
3285:
3286: if (!@results) {
3287: $result .= ' <li>' .
3288: &mt('No changes were made to current settings.') . '</li>';
3289: }
3290:
3291: $result .= '</ul>';
3292: }
3293:
3294: my $actionURL = $self->{EXIT_PAGE};
3295: my $targetURL = '';
3296: my $finish=&mt('Finish');
3297: if ($self->{'restartCourse'}) {
3298: $actionURL = '/adm/roles';
3299: $targetURL = '/adm/menu';
3300: if ($env{'course.'.$env{'request.course.id'}.'.url'}=~/^uploaded/) {
3301: $targetURL = '/adm/coursedocs';
3302: } else {
3303: $targetURL = '/adm/navmaps';
3304: }
3305: if ($env{'course.'.$env{'request.course.id'}.'.clonedfrom'}) {
3306: $targetURL = '/adm/parmset?overview=1';
3307: }
3308: my $finish=&mt('Finish Course Initialization');
3309: }
3310: my $previous = HTML::Entities::encode(&mt("<- Previous"), '<>&"');
3311: my $next = HTML::Entities::encode(&mt("Next ->"), '<>&"');
3312: my $target = " target='loncapaclient'";
3313: if (($env{'browser.interface'} eq 'textual') ||
3314: ($env{'environment.remote'} eq 'off')) { $target=''; }
3315: $result .= "<center>\n" .
3316: "<form action='".$actionURL."' method='post' $target>\n" .
3317: "<input type='button' onclick='history.go(-1)' value='$previous' />" .
3318: "<input type='hidden' name='orgurl' value='$targetURL' />" .
3319: "<input type='hidden' name='selectrole' value='1' />\n" .
3320: "<input type='hidden' name='" . $env{'request.role'} .
3321: "' value='1' />\n<input type='submit' value='" . $finish . "' />\n" .
3322: "</form></center>";
3323:
3324: return $result;
3325: }
3326:
3327: sub overrideForm {
3328: return 1;
3329: }
3330:
3331: 1;
3332:
3333: package Apache::lonhelper::parmwizfinal;
3334:
3335: # This is the final state for the parmwizard. It is not generally useful,
3336: # so it is not perldoc'ed. It does its own processing.
3337: # It is represented with <parmwizfinal />, and
3338: # should later be moved to lonparmset.pm .
3339:
3340: no strict;
3341: @ISA = ('Apache::lonhelper::element');
3342: use strict;
3343: use Apache::lonlocal;
3344: use Apache::lonnet;
3345:
3346: BEGIN {
3347: &Apache::lonhelper::register('Apache::lonhelper::parmwizfinal',
3348: ('parmwizfinal'));
3349: }
3350:
3351: use Time::localtime;
3352:
3353: sub new {
3354: my $ref = Apache::lonhelper::choices->new();
3355: bless ($ref);
3356: }
3357:
3358: sub start_parmwizfinal { return ''; }
3359:
3360: sub end_parmwizfinal {
3361: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
3362:
3363: if ($target ne 'helper') {
3364: return '';
3365: }
3366: Apache::lonhelper::parmwizfinal->new();
3367: }
3368:
3369: # Renders a form that, when submitted, will form the input to lonparmset.pm
3370: sub render {
3371: my $self = shift;
3372: my $vars = $helper->{VARS};
3373:
3374: # FIXME: Unify my designators with the standard ones
3375: my %dateTypeHash = ('open_date' => "opening date",
3376: 'due_date' => "due date",
3377: 'answer_date' => "answer date",
3378: 'tries' => 'number of tries',
3379: 'weight' => 'problem weight'
3380: );
3381: my %parmTypeHash = ('open_date' => "0_opendate",
3382: 'due_date' => "0_duedate",
3383: 'answer_date' => "0_answerdate",
3384: 'tries' => '0_maxtries',
3385: 'weight' => '0_weight' );
3386: my %realParmName = ('open_date' => "opendate",
3387: 'due_date' => "duedate",
3388: 'answer_date' => "answerdate",
3389: 'tries' => 'maxtries',
3390: 'weight' => 'weight' );
3391:
3392: my $affectedResourceId = "";
3393: my $parm_name = $parmTypeHash{$vars->{ACTION_TYPE}};
3394: my $level = "";
3395: my $resourceString;
3396: my $symb;
3397: my $paramlevel;
3398:
3399: # Print the granularity, depending on the action
3400: if ($vars->{GRANULARITY} eq 'whole_course') {
3401: $resourceString .= '<li>'.&mt('for <b>all resources in the course</b>').'</li>';
3402: if ($vars->{TARGETS} eq 'course') {
3403: $level = 14; # general course, see lonparmset.pm perldoc
3404: } elsif ($vars->{TARGETS} eq 'section') {
3405: $level = 9;
3406: } elsif ($vars->{TARGETS} eq 'group') {
3407: $level = 6;
3408: } else {
3409: $level = 3;
3410: }
3411: $affectedResourceId = "0.0";
3412: $symb = 'a';
3413: $paramlevel = 'general';
3414: } elsif ($vars->{GRANULARITY} eq 'map') {
3415: my $navmap = Apache::lonnavmaps::navmap->new();
3416: my $res = $navmap->getByMapPc($vars->{RESOURCE_ID});
3417: my $title = $res->compTitle();
3418: $symb = $res->symb();
3419: $resourceString .= '<li>'.&mt('for the map named [_1]',"<b>$title</b>").'</li>';
3420: if ($vars->{TARGETS} eq 'course') {
3421: $level = 13; # general course, see lonparmset.pm perldoc
3422: } elsif ($vars->{TARGETS} eq 'section') {
3423: $level = 8;
3424: } elsif ($vars->{TARGETS} eq 'group') {
3425: $level = 5;
3426: } else {
3427: $level = 2;
3428: }
3429: $affectedResourceId = $vars->{RESOURCE_ID};
3430: $paramlevel = 'map';
3431: } else {
3432: my $navmap = Apache::lonnavmaps::navmap->new();
3433: my $res = $navmap->getById($vars->{RESOURCE_ID});
3434: my $part = $vars->{RESOURCE_ID_part};
3435: if ($part ne 'All Parts' && $part) { $parm_name=~s/^0/$part/; } else { $part=&mt('All Parts'); }
3436: $symb = $res->symb();
3437: my $title = $res->compTitle();
3438: $resourceString .= '<li>'.&mt('for the resource named [_1] part [_2]',"<b>$title</b>","<b>$part</b>").'</li>';
3439: if ($vars->{TARGETS} eq 'course') {
3440: $level = 10; # general course, see lonparmset.pm perldoc
3441: } elsif ($vars->{TARGETS} eq 'section') {
3442: $level = 7;
3443: } elsif ($vars->{TARGETS} eq 'group') {
3444: $level = 4;
3445: } else {
3446: $level = 1;
3447: }
3448: $affectedResourceId = $vars->{RESOURCE_ID};
3449: $paramlevel = 'full';
3450: }
3451:
3452: my $result = "<form name='helpform' method='POST' action='/adm/parmset#$affectedResourceId&$parm_name&$level'>\n";
3453: $result .= "<input type='hidden' name='action' value='settable' />\n";
3454: $result .= "<input type='hidden' name='dis' value='helper' />\n";
3455: $result .= "<input type='hidden' name='pscat' value='".
3456: $realParmName{$vars->{ACTION_TYPE}}."' />\n";
3457: if ($vars->{GRANULARITY} eq 'resource') {
3458: $result .= "<input type='hidden' name='symb' value='".
3459: HTML::Entities::encode($symb,"'<>&\"") . "' />\n";
3460: } elsif ($vars->{GRANULARITY} eq 'map') {
3461: $result .= "<input type='hidden' name='pschp' value='".
3462: $affectedResourceId."' />\n";
3463: }
3464: my $part = $vars->{RESOURCE_ID_part};
3465: if ($part eq 'All Parts' || !$part) { $part=0; }
3466: $result .= "<input type='hidden' name='psprt' value='".
3467: HTML::Entities::encode($part,"'<>&\"") . "' />\n";
3468:
3469: $result .= '<p>'.&mt('Confirm that this information is correct, then click "Finish Helper" to complete setting the parameter.').'<ul>';
3470:
3471: # Print the type of manipulation:
3472: my $extra;
3473: if ($vars->{ACTION_TYPE} eq 'tries') {
3474: $extra = $vars->{TRIES};
3475: }
3476: if ($vars->{ACTION_TYPE} eq 'weight') {
3477: $extra = $vars->{WEIGHT};
3478: }
3479: $result .= "<li>";
3480: my $what = &mt($dateTypeHash{$vars->{ACTION_TYPE}});
3481: if ($extra) {
3482: $result .= &mt('Setting the [_1] to [_2]',"<b>$what</b>",$extra);
3483: } else {
3484: $result .= &mt('Setting the [_1]',"<b>$what</b>");
3485: }
3486: $result .= "</li>\n";
3487: if ($vars->{ACTION_TYPE} eq 'due_date' ||
3488: $vars->{ACTION_TYPE} eq 'answer_date') {
3489: # for due dates, we default to "date end" type entries
3490: $result .= "<input type='hidden' name='recent_date_end' " .
3491: "value='" . $vars->{PARM_DATE} . "' />\n";
3492: $result .= "<input type='hidden' name='pres_value' " .
3493: "value='" . $vars->{PARM_DATE} . "' />\n";
3494: $result .= "<input type='hidden' name='pres_type' " .
3495: "value='date_end' />\n";
3496: } elsif ($vars->{ACTION_TYPE} eq 'open_date') {
3497: $result .= "<input type='hidden' name='recent_date_start' ".
3498: "value='" . $vars->{PARM_DATE} . "' />\n";
3499: $result .= "<input type='hidden' name='pres_value' " .
3500: "value='" . $vars->{PARM_DATE} . "' />\n";
3501: $result .= "<input type='hidden' name='pres_type' " .
3502: "value='date_start' />\n";
3503: } elsif ($vars->{ACTION_TYPE} eq 'tries') {
3504: $result .= "<input type='hidden' name='pres_value' " .
3505: "value='" . $vars->{TRIES} . "' />\n";
3506: $result .= "<input type='hidden' name='pres_type' " .
3507: "value='int_pos' />\n";
3508: } elsif ($vars->{ACTION_TYPE} eq 'weight') {
3509: $result .= "<input type='hidden' name='pres_value' " .
3510: "value='" . $vars->{WEIGHT} . "' />\n";
3511: }
3512:
3513: $result .= $resourceString;
3514:
3515: # Print targets
3516: if ($vars->{TARGETS} eq 'course') {
3517: $result .= '<li>'.&mt('for <b>all students in course</b>').'</li>';
3518: } elsif ($vars->{TARGETS} eq 'section') {
3519: my $section = $vars->{SECTION_NAME};
3520: $result .= '<li>'.&mt('for section [_1]',"<b>$section</b>").'</li>';
3521: $result .= "<input type='hidden' name='csec' value='" .
3522: HTML::Entities::encode($section,"'<>&\"") . "' />\n";
3523: } elsif ($vars->{TARGETS} eq 'group') {
3524: my $group = $vars->{GROUP_NAME};
3525: $result .= '<li>'.&mt('for group [_1]',"<b>$group</b>").'</li>';
3526: $result .= "<input type='hidden' name='cgroup' value='" .
3527: HTML::Entities::encode($group,"'<>&\"") . "' />\n";
3528: } else {
3529: # FIXME: This is probably wasteful! Store the name!
3530: my $classlist = Apache::loncoursedata::get_classlist();
3531: my ($uname,$udom)=split(':',$vars->{USER_NAME});
3532: my $name = $classlist->{$uname.':'.$udom}->[6];
3533: $result .= '<li>'.&mt('for [_1]',"<b>$name</b>").'</li>';
3534: $result .= "<input type='hidden' name='uname' value='".
3535: HTML::Entities::encode($uname,"'<>&\"") . "' />\n";
3536: $result .= "<input type='hidden' name='udom' value='".
3537: HTML::Entities::encode($udom,"'<>&\"") . "' />\n";
3538: }
3539:
3540: # Print value
3541: if ($vars->{ACTION_TYPE} ne 'tries' && $vars->{ACTION_TYPE} ne 'weight') {
3542: $result .= '<li>'.&mt('to [_1] ([_2])',"<b>".ctime($vars->{PARM_DATE})."</b>",Apache::lonnavmaps::timeToHumanString($vars->{PARM_DATE}))."</li>\n";
3543: }
3544:
3545: # print pres_marker
3546: $result .= "\n<input type='hidden' name='pres_marker'" .
3547: " value='$affectedResourceId&$parm_name&$level' />\n";
3548:
3549: # Make the table appear
3550: $result .= "\n<input type='hidden' value='true' name='prevvisit' />";
3551: $result .= "\n<input type='hidden' value='$symb' name='pssymb' />";
3552: $result .= "\n<input type='hidden' value='$paramlevel' name='parmlev' />";
3553:
3554: $result .= "<br /><br /><center><input type='submit' value='".&mt('Finish Helper')."' /></center></form>\n";
3555:
3556: return $result;
3557: }
3558:
3559: sub overrideForm {
3560: return 1;
3561: }
3562:
3563: 1;
3564:
3565: __END__
3566:
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