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[LON-CAPA] /
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lonhelper.pm
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1.39:
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Thu Jun 19 19:28:52 2003 UTC (20 years, 11 months ago) by
bowersj2
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HEAD
"student" option now allows a parameter that allows you to select
course personnel as well, but this will have a problem with multiple
roles for the same person. Still, this is an improvement, if not a final
fix...
1: # The LearningOnline Network with CAPA
2: # .helper XML handler to implement the LON-CAPA helper
3: #
4: # $Id: lonhelper.pm,v 1.39 2003/06/19 19:28:52 bowersj2 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: # (Page Handler
29: #
30: # (.helper handler
31: #
32:
33: =pod
34:
35: =head1 lonhelper - HTML Helper framework for LON-CAPA
36:
37: Helpers, often known as "wizards", are well-established UI widgets that users
38: feel comfortable with. It can take a complicated multidimensional problem the
39: user has and turn it into a series of bite-sized one-dimensional questions.
40:
41: For developers, helpers provide an easy way to bundle little bits of functionality
42: for the user, without having to write the tedious state-maintenence code.
43:
44: Helpers are defined as XML documents, placed in the /home/httpd/html/adm/helpers
45: directory and having the .helper file extension. For examples, see that directory.
46:
47: All classes are in the Apache::lonhelper namespace.
48:
49: =head2 lonhelper XML file format
50:
51: A helper consists of a top-level <helper> tag which contains a series of states.
52: Each state contains one or more state elements, which are what the user sees, like
53: messages, resource selections, or date queries.
54:
55: The helper tag is required to have one attribute, "title", which is the name
56: of the helper itself, such as "Parameter helper". The helper tag may optionally
57: have a "requiredpriv" attribute, specifying the priviledge a user must have
58: to use the helper, or get denied access. See loncom/auth/rolesplain.tab for
59: useful privs. Default is full access, which is often wrong!
60:
61: =head2 State tags
62:
63: State tags are required to have an attribute "name", which is the symbolic
64: name of the state and will not be directly seen by the user. The helper is
65: required to have one state named "START", which is the state the helper
66: will start with. By convention, this state should clearly describe what
67: the helper will do for the user, and may also include the first information
68: entry the user needs to do for the helper.
69:
70: State tags are also required to have an attribute "title", which is the
71: human name of the state, and will be displayed as the header on top of
72: the screen for the user.
73:
74: =head2 Example Helper Skeleton
75:
76: An example of the tags so far:
77:
78: <helper title="Example Helper">
79: <state name="START" title="Demonstrating the Example Helper">
80: <!-- notice this is the START state the wizard requires -->
81: </state>
82: <state name="GET_NAME" title="Enter Student Name">
83: </state>
84: </helper>
85:
86: Of course this does nothing. In order for the wizard to do something, it is
87: necessary to put actual elements into the wizard. Documentation for each
88: of these elements follows.
89:
90: =head2 Creating a Helper With Code, Not XML
91:
92: In some situations, such as the printing wizard (see lonprintout.pm),
93: writing the helper in XML would be too complicated, because of scope
94: issues or the fact that the code actually outweighs the XML. It is
95: possible to create a helper via code, though it is a little odd.
96:
97: Creating a helper via code is more like issuing commands to create
98: a helper then normal code writing. For instance, elements will automatically
99: be added to the last state created, so it's important to create the
100: states in the correct order.
101:
102: First, create a new helper:
103:
104: use Apache::lonhelper;
105:
106: my $helper = Apache::lonhelper::new->("Helper Title");
107:
108: Next you'll need to manually add states to the helper:
109:
110: Apache::lonhelper::state->new("STATE_NAME", "State's Human Title");
111:
112: You don't need to save a reference to it because all elements up until
113: the next state creation will automatically be added to this state.
114:
115: Elements are created by populating the $paramHash in
116: Apache::lonhelper::paramhash. To prevent namespace issues, retrieve
117: a reference to that has with getParamHash:
118:
119: my $paramHash = Apache::lonhelper::getParamHash();
120:
121: You will need to do this for each state you create.
122:
123: Populate the $paramHash with the parameters for the element you wish
124: to add next; the easiest way to find out what those entries are is
125: to read the code. Some common ones are 'variable' to record the variable
126: to store the results in, and NEXTSTATE to record a next state transition.
127:
128: Then create your element:
129:
130: $paramHash->{MESSAGETEXT} = "This is a message.";
131: Apache::lonhelper::message->new();
132:
133: The creation will take the $paramHash and bless it into a
134: Apache::lonhelper::message object. To create the next element, you need
135: to get a reference to the new, empty $paramHash:
136:
137: $paramHash = Apache::lonhelper::getParamHash();
138:
139: and you can repeat creating elements that way. You can add states
140: and elements as needed.
141:
142: See lonprintout.pm, subroutine printHelper for an example of this, where
143: we dynamically add some states to prevent security problems, for instance.
144:
145: Normally the machinery in the XML format is sufficient; dynamically
146: adding states can easily be done by wrapping the state in a <condition>
147: tag. This should only be used when the code dominates the XML content,
148: the code is so complicated that it is difficult to get access to
149: all of the information you need because of scoping issues, or so much
150: of the information used is persistent because would-be <exec> or
151: <eval> blocks that using the {DATA} mechanism results in hard-to-read
152: and -maintain code.
153:
154: It is possible to do some of the work with an XML fragment parsed by
155: lonxml; again, see lonprintout.pm for an example. In that case it is
156: imperative that you call B<Apache::lonhelper::registerHelperTags()>
157: before parsing XML fragments and B<Apache::lonhelper::unregisterHelperTags()>
158: when you are done. See lonprintout.pm for examples of this usage in the
159: printHelper subroutine.
160:
161: =cut
162:
163: package Apache::lonhelper;
164: use Apache::Constants qw(:common);
165: use Apache::File;
166: use Apache::lonxml;
167:
168: # Register all the tags with the helper, so the helper can
169: # push and pop them
170:
171: my @helperTags;
172:
173: sub register {
174: my ($namespace, @tags) = @_;
175:
176: for my $tag (@tags) {
177: push @helperTags, [$namespace, $tag];
178: }
179: }
180:
181: BEGIN {
182: Apache::lonxml::register('Apache::lonhelper',
183: ('helper'));
184: register('Apache::lonhelper', ('state'));
185: }
186:
187: # Since all helpers are only three levels deep (helper tag, state tag,
188: # substate type), it's easier and more readble to explicitly track
189: # those three things directly, rather then futz with the tag stack
190: # every time.
191: my $helper;
192: my $state;
193: my $substate;
194: # To collect parameters, the contents of the subtags are collected
195: # into this paramHash, then passed to the element object when the
196: # end of the element tag is located.
197: my $paramHash;
198:
199: # Note from Jeremy 5-8-2003: It is *vital* that the real handler be called
200: # as a subroutine from the handler, or very mysterious things might happen.
201: # I don't know exactly why, but it seems that the scope where the Apache
202: # server enters the perl handler is treated differently from the rest of
203: # the handler. This also seems to manifest itself in the debugger as entering
204: # the perl handler in seemingly random places (sometimes it starts in the
205: # compiling phase, sometimes in the handler execution phase where it runs
206: # the code and stepping into the "1;" the module ends with goes into the handler,
207: # sometimes starting directly with the handler); I think the cause is related.
208: # In the debugger, this means that breakpoints are ignored until you step into
209: # a function and get out of what must be a "faked up scope" in the Apache->
210: # mod_perl connection. In this code, it was manifesting itself in the existence
211: # of two seperate file-scoped $helper variables, one set to the value of the
212: # helper in the helper constructor, and one referenced by the handler on the
213: # "$helper->process()" line. The second was therefore never set, and was still
214: # undefined when I tried to call process on it.
215: # By pushing the "real handler" down into the "real scope", everybody except the
216: # actual handler function directly below this comment gets the same $helper and
217: # everybody is happy.
218: # The upshot of all of this is that for safety when a handler is using
219: # file-scoped variables in LON-CAPA, the handler should be pushed down one
220: # call level, as I do here, to ensure that the top-level handler function does
221: # not get a different file scope from the rest of the code.
222: sub handler {
223: my $r = shift;
224: return real_handler($r);
225: }
226:
227: # For debugging purposes, one can send a second parameter into this
228: # function, the 'uri' of the helper you wish to have rendered, and
229: # call this from other handlers.
230: sub real_handler {
231: my $r = shift;
232: my $uri = shift;
233: if (!defined($uri)) { $uri = $r->uri(); }
234: $ENV{'request.uri'} = $uri;
235: my $filename = '/home/httpd/html' . $uri;
236: my $fh = Apache::File->new($filename);
237: my $file;
238: read $fh, $file, 100000000;
239:
240:
241: # Send header, don't cache this page
242: if ($r->header_only) {
243: if ($ENV{'browser.mathml'}) {
244: $r->content_type('text/xml');
245: } else {
246: $r->content_type('text/html');
247: }
248: $r->send_http_header;
249: return OK;
250: }
251: if ($ENV{'browser.mathml'}) {
252: $r->content_type('text/xml');
253: } else {
254: $r->content_type('text/html');
255: }
256: $r->send_http_header;
257: $r->rflush();
258:
259: # Discard result, we just want the objects that get created by the
260: # xml parsing
261: &Apache::lonxml::xmlparse($r, 'helper', $file);
262:
263: my $allowed = $helper->allowedCheck();
264: if (!$allowed) {
265: $ENV{'user.error.msg'} = $ENV{'request.uri'}.':'.$helper->{REQUIRED_PRIV}.
266: ":0:0:Permission denied to access this helper.";
267: return HTTP_NOT_ACCEPTABLE;
268: }
269:
270: $helper->process();
271:
272: $r->print($helper->display());
273: return OK;
274: }
275:
276: sub registerHelperTags {
277: for my $tagList (@helperTags) {
278: Apache::lonxml::register($tagList->[0], $tagList->[1]);
279: }
280: }
281:
282: sub unregisterHelperTags {
283: for my $tagList (@helperTags) {
284: Apache::lonxml::deregister($tagList->[0], $tagList->[1]);
285: }
286: }
287:
288: sub start_helper {
289: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
290:
291: if ($target ne 'helper') {
292: return '';
293: }
294:
295: registerHelperTags();
296:
297: Apache::lonhelper::helper->new($token->[2]{'title'}, $token->[2]{'requiredpriv'});
298: return '';
299: }
300:
301: sub end_helper {
302: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
303:
304: if ($target ne 'helper') {
305: return '';
306: }
307:
308: unregisterHelperTags();
309:
310: return '';
311: }
312:
313: sub start_state {
314: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
315:
316: if ($target ne 'helper') {
317: return '';
318: }
319:
320: Apache::lonhelper::state->new($token->[2]{'name'},
321: $token->[2]{'title'});
322: return '';
323: }
324:
325: # Use this to get the param hash from other files.
326: sub getParamHash {
327: return $paramHash;
328: }
329:
330: # Use this to get the helper, if implementing elements in other files
331: # (like lonprintout.pm)
332: sub getHelper {
333: return $helper;
334: }
335:
336: # don't need this, so ignore it
337: sub end_state {
338: return '';
339: }
340:
341: 1;
342:
343: package Apache::lonhelper::helper;
344:
345: use Digest::MD5 qw(md5_hex);
346: use HTML::Entities;
347: use Apache::loncommon;
348: use Apache::File;
349:
350: sub new {
351: my $proto = shift;
352: my $class = ref($proto) || $proto;
353: my $self = {};
354:
355: $self->{TITLE} = shift;
356: $self->{REQUIRED_PRIV} = shift;
357:
358: # If there is a state from the previous form, use that. If there is no
359: # state, use the start state parameter.
360: if (defined $ENV{"form.CURRENT_STATE"})
361: {
362: $self->{STATE} = $ENV{"form.CURRENT_STATE"};
363: }
364: else
365: {
366: $self->{STATE} = "START";
367: }
368:
369: $self->{TOKEN} = $ENV{'form.TOKEN'};
370: # If a token was passed, we load that in. Otherwise, we need to create a
371: # new storage file
372: # Tried to use standard Tie'd hashes, but you can't seem to take a
373: # reference to a tied hash and write to it. I'd call that a wart.
374: if ($self->{TOKEN}) {
375: # Validate the token before trusting it
376: if ($self->{TOKEN} !~ /^[a-f0-9]{32}$/) {
377: # Not legit. Return nothing and let all hell break loose.
378: # User shouldn't be doing that!
379: return undef;
380: }
381:
382: # Get the hash.
383: $self->{FILENAME} = $Apache::lonnet::tmpdir . md5_hex($self->{TOKEN}); # Note the token is not the literal file
384:
385: my $file = Apache::File->new($self->{FILENAME});
386: my $contents = <$file>;
387:
388: # Now load in the contents
389: for my $value (split (/&/, $contents)) {
390: my ($name, $value) = split(/=/, $value);
391: $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
392: $self->{VARS}->{$name} = $value;
393: }
394:
395: $file->close();
396: } else {
397: # Only valid if we're just starting.
398: if ($self->{STATE} ne 'START') {
399: return undef;
400: }
401: # Must create the storage
402: $self->{TOKEN} = md5_hex($ENV{'user.name'} . $ENV{'user.domain'} .
403: time() . rand());
404: $self->{FILENAME} = $Apache::lonnet::tmpdir . md5_hex($self->{TOKEN});
405: }
406:
407: # OK, we now have our persistent storage.
408:
409: if (defined $ENV{"form.RETURN_PAGE"})
410: {
411: $self->{RETURN_PAGE} = $ENV{"form.RETURN_PAGE"};
412: }
413: else
414: {
415: $self->{RETURN_PAGE} = $ENV{REFERER};
416: }
417:
418: $self->{STATES} = {};
419: $self->{DONE} = 0;
420:
421: # Used by various helpers for various things; see lonparm.helper
422: # for an example.
423: $self->{DATA} = {};
424:
425: $helper = $self;
426:
427: # Establish the $paramHash
428: $paramHash = {};
429:
430: bless($self, $class);
431: return $self;
432: }
433:
434: # Private function; returns a string to construct the hidden fields
435: # necessary to have the helper track state.
436: sub _saveVars {
437: my $self = shift;
438: my $result = "";
439: $result .= '<input type="hidden" name="CURRENT_STATE" value="' .
440: HTML::Entities::encode($self->{STATE}) . "\" />\n";
441: $result .= '<input type="hidden" name="TOKEN" value="' .
442: $self->{TOKEN} . "\" />\n";
443: $result .= '<input type="hidden" name="RETURN_PAGE" value="' .
444: HTML::Entities::encode($self->{RETURN_PAGE}) . "\" />\n";
445:
446: return $result;
447: }
448:
449: # Private function: Create the querystring-like representation of the stored
450: # data to write to disk.
451: sub _varsInFile {
452: my $self = shift;
453: my @vars = ();
454: for my $key (keys %{$self->{VARS}}) {
455: push @vars, &Apache::lonnet::escape($key) . '=' .
456: &Apache::lonnet::escape($self->{VARS}->{$key});
457: }
458: return join ('&', @vars);
459: }
460:
461: # Use this to declare variables.
462: # FIXME: Document this
463: sub declareVar {
464: my $self = shift;
465: my $var = shift;
466:
467: if (!defined($self->{VARS}->{$var})) {
468: $self->{VARS}->{$var} = '';
469: }
470:
471: my $envname = 'form.' . $var . '.forminput';
472: if (defined($ENV{$envname})) {
473: if (ref($ENV{$envname})) {
474: $self->{VARS}->{$var} = join('|||', @{$ENV{$envname}});
475: } else {
476: $self->{VARS}->{$var} = $ENV{$envname};
477: }
478: }
479: }
480:
481: sub allowedCheck {
482: my $self = shift;
483:
484: if (!defined($self->{REQUIRED_PRIV})) {
485: return 1;
486: }
487:
488: return Apache::lonnet::allowed($self->{REQUIRED_PRIV}, $ENV{'request.course.id'});
489: }
490:
491: sub changeState {
492: my $self = shift;
493: $self->{STATE} = shift;
494: }
495:
496: sub registerState {
497: my $self = shift;
498: my $state = shift;
499:
500: my $stateName = $state->name();
501: $self->{STATES}{$stateName} = $state;
502: }
503:
504: sub process {
505: my $self = shift;
506:
507: # Phase 1: Post processing for state of previous screen (which is actually
508: # the "current state" in terms of the helper variables), if it wasn't the
509: # beginning state.
510: if ($self->{STATE} ne "START" || $ENV{"form.SUBMIT"} eq "Next ->") {
511: my $prevState = $self->{STATES}{$self->{STATE}};
512: $prevState->postprocess();
513: }
514:
515: # Note, to handle errors in a state's input that a user must correct,
516: # do not transition in the postprocess, and force the user to correct
517: # the error.
518:
519: # Phase 2: Preprocess current state
520: my $startState = $self->{STATE};
521: my $state = $self->{STATES}->{$startState};
522:
523: # For debugging, print something here to determine if you're going
524: # to an undefined state.
525: if (!defined($state)) {
526: return;
527: }
528: $state->preprocess();
529:
530: # Phase 3: While the current state is different from the previous state,
531: # keep processing.
532: while ( $startState ne $self->{STATE} &&
533: defined($self->{STATES}->{$self->{STATE}}) )
534: {
535: $startState = $self->{STATE};
536: $state = $self->{STATES}->{$startState};
537: $state->preprocess();
538: }
539:
540: return;
541: }
542:
543: # 1: Do the post processing for the previous state.
544: # 2: Do the preprocessing for the current state.
545: # 3: Check to see if state changed, if so, postprocess current and move to next.
546: # Repeat until state stays stable.
547: # 4: Render the current state to the screen as an HTML page.
548: sub display {
549: my $self = shift;
550:
551: my $state = $self->{STATES}{$self->{STATE}};
552:
553: my $result = "";
554:
555: if (!defined($state)) {
556: $result = "<font color='#ff0000'>Error: state '$state' not defined!</font>";
557: return $result;
558: }
559:
560: # Phase 4: Display.
561: my $stateTitle = $state->title();
562: my $bodytag = &Apache::loncommon::bodytag("$self->{TITLE}",'','');
563:
564: $result .= <<HEADER;
565: <html>
566: <head>
567: <title>LON-CAPA Helper: $self->{TITLE}</title>
568: </head>
569: $bodytag
570: HEADER
571: if (!$state->overrideForm()) { $result.="<form name='helpform' method='POST'>"; }
572: $result .= <<HEADER;
573: <table border="0" width='100%'><tr><td>
574: <h2><i>$stateTitle</i></h2>
575: HEADER
576:
577: $result .= "<table cellpadding='10' width='100%'><tr><td rowspan='2' valign='top'>";
578:
579: if (!$state->overrideForm()) {
580: $result .= $self->_saveVars();
581: }
582: $result .= $state->render();
583:
584: $result .= "</td><td valign='top' align='right'>";
585:
586: # Warning: Copy and pasted from below, because it's too much trouble to
587: # turn this into a subroutine
588: if (!$state->overrideForm()) {
589: if ($self->{STATE} ne $self->{START_STATE}) {
590: #$result .= '<input name="SUBMIT" type="submit" value="<- Previous" /> ';
591: }
592: if ($self->{DONE}) {
593: my $returnPage = $self->{RETURN_PAGE};
594: $result .= "<a href=\"$returnPage\">End Helper</a>";
595: }
596: else {
597: $result .= '<nobr><input name="back" type="button" ';
598: $result .= 'value="<- Previous" onclick="history.go(-1)" /> ';
599: $result .= '<input name="SUBMIT" type="submit" value="Next ->" /></nobr>';
600: }
601: }
602:
603: $result .= "</td></tr><tr><td valign='bottom' align='right'>";
604:
605: # Warning: Copy and pasted from above, because it's too much trouble to
606: # turn this into a subroutine
607: if (!$state->overrideForm()) {
608: if ($self->{STATE} ne $self->{START_STATE}) {
609: #$result .= '<input name="SUBMIT" type="submit" value="<- Previous" /> ';
610: }
611: if ($self->{DONE}) {
612: my $returnPage = $self->{RETURN_PAGE};
613: $result .= "<a href=\"$returnPage\">End Helper</a>";
614: }
615: else {
616: $result .= '<nobr><input name="back" type="button" ';
617: $result .= 'value="<- Previous" onclick="history.go(-1)" /> ';
618: $result .= '<input name="SUBMIT" type="submit" value="Next ->" /></nobr>';
619: }
620: }
621:
622: #foreach my $key (keys %{$self->{VARS}}) {
623: # $result .= "|$key| -> " . $self->{VARS}->{$key} . "<br />";
624: #}
625:
626: $result .= "</td></tr></table>";
627:
628: $result .= <<FOOTER;
629: </td>
630: </tr>
631: </table>
632: </form>
633: </body>
634: </html>
635: FOOTER
636:
637: # Handle writing out the vars to the file
638: my $file = Apache::File->new('>'.$self->{FILENAME});
639: print $file $self->_varsInFile();
640:
641: return $result;
642: }
643:
644: 1;
645:
646: package Apache::lonhelper::state;
647:
648: # States bundle things together and are responsible for compositing the
649: # various elements together. It is not generally necessary for users to
650: # use the state object directly, so it is not perldoc'ed.
651:
652: # Basically, all the states do is pass calls to the elements and aggregate
653: # the results.
654:
655: sub new {
656: my $proto = shift;
657: my $class = ref($proto) || $proto;
658: my $self = {};
659:
660: $self->{NAME} = shift;
661: $self->{TITLE} = shift;
662: $self->{ELEMENTS} = [];
663:
664: bless($self, $class);
665:
666: $helper->registerState($self);
667:
668: $state = $self;
669:
670: return $self;
671: }
672:
673: sub name {
674: my $self = shift;
675: return $self->{NAME};
676: }
677:
678: sub title {
679: my $self = shift;
680: return $self->{TITLE};
681: }
682:
683: sub preprocess {
684: my $self = shift;
685: for my $element (@{$self->{ELEMENTS}}) {
686: $element->preprocess();
687: }
688: }
689:
690: # FIXME: Document that all postprocesses must return a true value or
691: # the state transition will be overridden
692: sub postprocess {
693: my $self = shift;
694:
695: # Save the state so we can roll it back if we need to.
696: my $originalState = $helper->{STATE};
697: my $everythingSuccessful = 1;
698:
699: for my $element (@{$self->{ELEMENTS}}) {
700: my $result = $element->postprocess();
701: if (!$result) { $everythingSuccessful = 0; }
702: }
703:
704: # If not all the postprocesses were successful, override
705: # any state transitions that may have occurred. It is the
706: # responsibility of the states to make sure they have
707: # error handling in that case.
708: if (!$everythingSuccessful) {
709: $helper->{STATE} = $originalState;
710: }
711: }
712:
713: # Override the form if any element wants to.
714: # two elements overriding the form will make a mess, but that should
715: # be considered helper author error ;-)
716: sub overrideForm {
717: my $self = shift;
718: for my $element (@{$self->{ELEMENTS}}) {
719: if ($element->overrideForm()) {
720: return 1;
721: }
722: }
723: return 0;
724: }
725:
726: sub addElement {
727: my $self = shift;
728: my $element = shift;
729:
730: push @{$self->{ELEMENTS}}, $element;
731: }
732:
733: sub render {
734: my $self = shift;
735: my @results = ();
736:
737: for my $element (@{$self->{ELEMENTS}}) {
738: push @results, $element->render();
739: }
740:
741: return join("\n", @results);
742: }
743:
744: 1;
745:
746: package Apache::lonhelper::element;
747: # Support code for elements
748:
749: =pod
750:
751: =head2 Element Base Class
752:
753: The Apache::lonhelper::element base class provides support for elements
754: and defines some generally useful tags for use in elements.
755:
756: B<finalcode tag>
757:
758: Each element can contain a "finalcode" tag that, when the special FINAL
759: helper state is used, will be executed, surrounded by "sub { my $helper = shift;"
760: and "}". It is expected to return a string describing what it did, which
761: may be an empty string. See course initialization helper for an example. This is
762: generally intended for helpers like the course initialization helper, which consist
763: of several panels, each of which is performing some sort of bite-sized functionality.
764:
765: B<defaultvalue tag>
766:
767: Each element that accepts user input can contain a "defaultvalue" tag that,
768: when surrounded by "sub { my $helper = shift; my $state = shift; " and "}",
769: will form a subroutine that when called will provide a default value for
770: the element. How this value is interpreted by the element is specific to
771: the element itself, and possibly the settings the element has (such as
772: multichoice vs. single choice for <choices> tags).
773:
774: This is also intended for things like the course initialization wizard, where the
775: user is setting various parameters. By correctly grabbing current settings
776: and including them into the helper, it allows the user to come back to the
777: helper later and re-execute it, without needing to worry about overwriting
778: some setting accidentally.
779:
780: Again, see the course initialization helper for examples.
781:
782: B<validator tag>
783:
784: Some elements that accepts user input can contain a "validator" tag that,
785: when surrounded by "sub { my $helper = shift; my $state = shift; my $element = shift; my $val = shift "
786: and "}", where "$val" is the value the user entered, will form a subroutine
787: that when called will verify whether the given input is valid or not. If it
788: is valid, the routine will return a false value. If invalid, the routine
789: will return an error message to be displayed for the user.
790:
791: Consult the documentation for each element to see whether it supports this
792: tag.
793:
794: B<getValue method>
795:
796: If the element stores the name of the variable in a 'variable' member, which
797: the provided ones all do, you can retreive the value of the variable by calling
798: this method.
799:
800: =cut
801:
802: BEGIN {
803: &Apache::lonhelper::register('Apache::lonhelper::element',
804: ('nextstate', 'finalcode',
805: 'defaultvalue', 'validator'));
806: }
807:
808: # Because we use the param hash, this is often a sufficent
809: # constructor
810: sub new {
811: my $proto = shift;
812: my $class = ref($proto) || $proto;
813: my $self = $paramHash;
814: bless($self, $class);
815:
816: $self->{PARAMS} = $paramHash;
817: $self->{STATE} = $state;
818: $state->addElement($self);
819:
820: # Ensure param hash is not reused
821: $paramHash = {};
822:
823: return $self;
824: }
825:
826: sub start_nextstate {
827: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
828:
829: if ($target ne 'helper') {
830: return '';
831: }
832:
833: $paramHash->{NEXTSTATE} = &Apache::lonxml::get_all_text('/nextstate',
834: $parser);
835: return '';
836: }
837:
838: sub end_nextstate { return ''; }
839:
840: sub start_finalcode {
841: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
842:
843: if ($target ne 'helper') {
844: return '';
845: }
846:
847: $paramHash->{FINAL_CODE} = &Apache::lonxml::get_all_text('/finalcode',
848: $parser);
849: return '';
850: }
851:
852: sub end_finalcode { return ''; }
853:
854: sub start_defaultvalue {
855: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
856:
857: if ($target ne 'helper') {
858: return '';
859: }
860:
861: $paramHash->{DEFAULT_VALUE} = &Apache::lonxml::get_all_text('/defaultvalue',
862: $parser);
863: $paramHash->{DEFAULT_VALUE} = 'sub { my $helper = shift; my $state = shift;' .
864: $paramHash->{DEFAULT_VALUE} . '}';
865: return '';
866: }
867:
868: sub end_defaultvalue { return ''; }
869:
870: sub start_validator {
871: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
872:
873: if ($target ne 'helper') {
874: return '';
875: }
876:
877: $paramHash->{VALIDATOR} = &Apache::lonxml::get_all_text('/validator',
878: $parser);
879: $paramHash->{VALIDATOR} = 'sub { my $helper = shift; my $state = shift; my $element = shift; my $val = shift;' .
880: $paramHash->{VALIDATOR} . '}';
881: return '';
882: }
883:
884: sub end_validator { return ''; }
885:
886: sub preprocess {
887: return 1;
888: }
889:
890: sub postprocess {
891: return 1;
892: }
893:
894: sub render {
895: return '';
896: }
897:
898: sub overrideForm {
899: return 0;
900: }
901:
902: sub getValue {
903: my $self = shift;
904: return $helper->{VARS}->{$self->{'variable'}};
905: }
906:
907: 1;
908:
909: package Apache::lonhelper::message;
910:
911: =pod
912:
913: =head2 Element: message
914:
915: Message elements display the contents of their <message_text> tags, and
916: transition directly to the state in the <nextstate> tag. Example:
917:
918: <message>
919: <nextstate>GET_NAME</nextstate>
920: <message_text>This is the <b>message</b> the user will see,
921: <i>HTML allowed</i>.</message_text>
922: </message>
923:
924: This will display the HTML message and transition to the <nextstate> if
925: given. The HTML will be directly inserted into the helper, so if you don't
926: want text to run together, you'll need to manually wrap the <message_text>
927: in <p> tags, or whatever is appropriate for your HTML.
928:
929: Message tags do not add in whitespace, so if you want it, you'll need to add
930: it into states. This is done so you can inline some elements, such as
931: the <date> element, right between two messages, giving the appearence that
932: the <date> element appears inline. (Note the elements can not be embedded
933: within each other.)
934:
935: This is also a good template for creating your own new states, as it has
936: very little code beyond the state template.
937:
938: =cut
939:
940: no strict;
941: @ISA = ("Apache::lonhelper::element");
942: use strict;
943:
944: BEGIN {
945: &Apache::lonhelper::register('Apache::lonhelper::message',
946: ('message'));
947: }
948:
949: sub new {
950: my $ref = Apache::lonhelper::element->new();
951: bless($ref);
952: }
953:
954: # CONSTRUCTION: Construct the message element from the XML
955: sub start_message {
956: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
957:
958: if ($target ne 'helper') {
959: return '';
960: }
961:
962: $paramHash->{MESSAGE_TEXT} = &Apache::lonxml::get_all_text('/message',
963: $parser);
964:
965: if (defined($token->[2]{'nextstate'})) {
966: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
967: }
968: return '';
969: }
970:
971: sub end_message {
972: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
973:
974: if ($target ne 'helper') {
975: return '';
976: }
977: Apache::lonhelper::message->new();
978: return '';
979: }
980:
981: sub render {
982: my $self = shift;
983:
984: return $self->{MESSAGE_TEXT};
985: }
986: # If a NEXTSTATE was given, switch to it
987: sub postprocess {
988: my $self = shift;
989: if (defined($self->{NEXTSTATE})) {
990: $helper->changeState($self->{NEXTSTATE});
991: }
992:
993: return 1;
994: }
995: 1;
996:
997: package Apache::lonhelper::choices;
998:
999: =pod
1000:
1001: =head2 Element: choices
1002:
1003: Choice states provide a single choice to the user as a text selection box.
1004: A "choice" is two pieces of text, one which will be displayed to the user
1005: (the "human" value), and one which will be passed back to the program
1006: (the "computer" value). For instance, a human may choose from a list of
1007: resources on disk by title, while your program wants the file name.
1008:
1009: <choices> takes an attribute "variable" to control which helper variable
1010: the result is stored in.
1011:
1012: <choices> takes an attribute "multichoice" which, if set to a true
1013: value, will allow the user to select multiple choices.
1014:
1015: <choices> takes an attribute "allowempty" which, if set to a true
1016: value, will allow the user to select none of the choices without raising
1017: an error message.
1018:
1019: B<SUB-TAGS>
1020:
1021: <choices> can have the following subtags:
1022:
1023: =over 4
1024:
1025: =item * <nextstate>state_name</nextstate>: If given, this will cause the
1026: choice element to transition to the given state after executing. If
1027: this is used, do not pass nextstates to the <choice> tag.
1028:
1029: =item * <choice />: If the choices are static,
1030: this element will allow you to specify them. Each choice
1031: contains attribute, "computer", as described above. The
1032: content of the tag will be used as the human label.
1033: For example,
1034: <choice computer='234-12-7312'>Bobby McDormik</choice>.
1035:
1036: <choice> can take a parameter "eval", which if set to
1037: a true value, will cause the contents of the tag to be
1038: evaluated as it would be in an <eval> tag; see <eval> tag
1039: below.
1040:
1041: <choice> may optionally contain a 'nextstate' attribute, which
1042: will be the state transisitoned to if the choice is made, if
1043: the choice is not multichoice.
1044:
1045: =back
1046:
1047: To create the choices programmatically, either wrap the choices in
1048: <condition> tags (prefered), or use an <exec> block inside the <choice>
1049: tag. Store the choices in $state->{CHOICES}, which is a list of list
1050: references, where each list has three strings. The first is the human
1051: name, the second is the computer name. and the third is the option
1052: next state. For example:
1053:
1054: <exec>
1055: for (my $i = 65; $i < 65 + 26; $i++) {
1056: push @{$state->{CHOICES}}, [chr($i), $i, 'next'];
1057: }
1058: </exec>
1059:
1060: This will allow the user to select from the letters A-Z (in ASCII), while
1061: passing the ASCII value back into the helper variables, and the state
1062: will in all cases transition to 'next'.
1063:
1064: You can mix and match methods of creating choices, as long as you always
1065: "push" onto the choice list, rather then wiping it out. (You can even
1066: remove choices programmatically, but that would probably be bad form.)
1067:
1068: B<defaultvalue support>
1069:
1070: Choices supports default values both in multichoice and single choice mode.
1071: In single choice mode, have the defaultvalue tag's function return the
1072: computer value of the box you want checked. If the function returns a value
1073: that does not correspond to any of the choices, the default behavior of selecting
1074: the first choice will be preserved.
1075:
1076: For multichoice, return a string with the computer values you want checked,
1077: delimited by triple pipes. Note this matches how the result of the <choices>
1078: tag is stored in the {VARS} hash.
1079:
1080: =cut
1081:
1082: no strict;
1083: @ISA = ("Apache::lonhelper::element");
1084: use strict;
1085:
1086: BEGIN {
1087: &Apache::lonhelper::register('Apache::lonhelper::choices',
1088: ('choice', 'choices'));
1089: }
1090:
1091: sub new {
1092: my $ref = Apache::lonhelper::element->new();
1093: bless($ref);
1094: }
1095:
1096: # CONSTRUCTION: Construct the message element from the XML
1097: sub start_choices {
1098: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1099:
1100: if ($target ne 'helper') {
1101: return '';
1102: }
1103:
1104: # Need to initialize the choices list, so everything can assume it exists
1105: $paramHash->{'variable'} = $token->[2]{'variable'} if (!defined($paramHash->{'variable'}));
1106: $helper->declareVar($paramHash->{'variable'});
1107: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
1108: $paramHash->{'allowempty'} = $token->[2]{'allowempty'};
1109: $paramHash->{CHOICES} = [];
1110: return '';
1111: }
1112:
1113: sub end_choices {
1114: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1115:
1116: if ($target ne 'helper') {
1117: return '';
1118: }
1119: Apache::lonhelper::choices->new();
1120: return '';
1121: }
1122:
1123: sub start_choice {
1124: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1125:
1126: if ($target ne 'helper') {
1127: return '';
1128: }
1129:
1130: my $computer = $token->[2]{'computer'};
1131: my $human = &Apache::lonxml::get_all_text('/choice',
1132: $parser);
1133: my $nextstate = $token->[2]{'nextstate'};
1134: my $evalFlag = $token->[2]{'eval'};
1135: push @{$paramHash->{CHOICES}}, [$human, $computer, $nextstate,
1136: $evalFlag];
1137: return '';
1138: }
1139:
1140: sub end_choice {
1141: return '';
1142: }
1143:
1144: sub render {
1145: # START HERE: Replace this with correct choices code.
1146: my $self = shift;
1147: my $var = $self->{'variable'};
1148: my $buttons = '';
1149: my $result = '';
1150:
1151: if ($self->{'multichoice'}) {
1152: $result .= <<SCRIPT;
1153: <script>
1154: function checkall(value, checkName) {
1155: for (i=0; i<document.forms.helpform.elements.length; i++) {
1156: ele = document.forms.helpform.elements[i];
1157: if (ele.name == checkName + '.forminput') {
1158: document.forms.helpform.elements[i].checked=value;
1159: }
1160: }
1161: }
1162: </script>
1163: SCRIPT
1164: }
1165:
1166: # Only print "select all" and "unselect all" if there are five or
1167: # more choices; fewer then that and it looks silly.
1168: if ($self->{'multichoice'} && scalar(@{$self->{CHOICES}}) > 4) {
1169: $buttons = <<BUTTONS;
1170: <br />
1171: <input type="button" onclick="checkall(true, '$var')" value="Select All" />
1172: <input type="button" onclick="checkall(false, '$var')" value="Unselect All" />
1173: <br />
1174: BUTTONS
1175: }
1176:
1177: if (defined $self->{ERROR_MSG}) {
1178: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br />';
1179: }
1180:
1181: $result .= $buttons;
1182:
1183: $result .= "<table>\n\n";
1184:
1185: my %checkedChoices;
1186: my $checkedChoicesFunc;
1187:
1188: if (defined($self->{DEFAULT_VALUE})) {
1189: $checkedChoicesFunc = eval ($self->{DEFAULT_VALUE});
1190: die 'Error in default value code for variable ' .
1191: $self->{'variable'} . ', Perl said: ' . $@ if $@;
1192: } else {
1193: $checkedChoicesFunc = sub { return ''; };
1194: }
1195:
1196: # Process which choices should be checked.
1197: if ($self->{'multichoice'}) {
1198: for my $selectedChoice (split(/\|\|\|/, (&$checkedChoicesFunc($helper, $self)))) {
1199: $checkedChoices{$selectedChoice} = 1;
1200: }
1201: } else {
1202: # single choice
1203: my $selectedChoice = &$checkedChoicesFunc($helper, $self);
1204:
1205: my $foundChoice = 0;
1206:
1207: # check that the choice is in the list of choices.
1208: for my $choice (@{$self->{CHOICES}}) {
1209: if ($choice->[1] eq $selectedChoice) {
1210: $checkedChoices{$choice->[1]} = 1;
1211: $foundChoice = 1;
1212: }
1213: }
1214:
1215: # If we couldn't find the choice, pick the first one
1216: if (!$foundChoice) {
1217: $checkedChoices{$self->{CHOICES}->[0]->[1]} = 1;
1218: }
1219: }
1220:
1221: my $type = "radio";
1222: if ($self->{'multichoice'}) { $type = 'checkbox'; }
1223: foreach my $choice (@{$self->{CHOICES}}) {
1224: $result .= "<tr>\n<td width='20'> </td>\n";
1225: $result .= "<td valign='top'><input type='$type' name='$var.forminput'"
1226: . "' value='" .
1227: HTML::Entities::encode($choice->[1])
1228: . "'";
1229: if ($checkedChoices{$choice->[1]}) {
1230: $result .= " checked ";
1231: }
1232: my $choiceLabel = $choice->[0];
1233: if ($choice->[4]) { # if we need to evaluate this choice
1234: $choiceLabel = "sub { my $helper = shift; my $state = shift;" .
1235: $choiceLabel . "}";
1236: $choiceLabel = eval($choiceLabel);
1237: $choiceLabel = &$choiceLabel($helper, $self);
1238: }
1239: $result .= "/></td><td> " . $choiceLabel . "</td></tr>\n";
1240: }
1241: $result .= "</table>\n\n\n";
1242: $result .= $buttons;
1243:
1244: return $result;
1245: }
1246:
1247: # If a NEXTSTATE was given or a nextstate for this choice was
1248: # given, switch to it
1249: sub postprocess {
1250: my $self = shift;
1251: my $chosenValue = $ENV{'form.' . $self->{'variable'} . '.forminput'};
1252:
1253: if (!defined($chosenValue) && !$self->{'allowempty'}) {
1254: $self->{ERROR_MSG} = "You must choose one or more choices to" .
1255: " continue.";
1256: return 0;
1257: }
1258:
1259: if (ref($chosenValue)) {
1260: $helper->{VARS}->{$self->{'variable'}} = join('|||', @$chosenValue);
1261: }
1262:
1263: if (defined($self->{NEXTSTATE})) {
1264: $helper->changeState($self->{NEXTSTATE});
1265: }
1266:
1267: foreach my $choice (@{$self->{CHOICES}}) {
1268: if ($choice->[1] eq $chosenValue) {
1269: if (defined($choice->[2])) {
1270: $helper->changeState($choice->[2]);
1271: }
1272: }
1273: }
1274: return 1;
1275: }
1276: 1;
1277:
1278: package Apache::lonhelper::date;
1279:
1280: =pod
1281:
1282: =head2 Element: date
1283:
1284: Date elements allow the selection of a date with a drop down list.
1285:
1286: Date elements can take two attributes:
1287:
1288: =over 4
1289:
1290: =item * B<variable>: The name of the variable to store the chosen
1291: date in. Required.
1292:
1293: =item * B<hoursminutes>: If a true value, the date will show hours
1294: and minutes, as well as month/day/year. If false or missing,
1295: the date will only show the month, day, and year.
1296:
1297: =back
1298:
1299: Date elements contain only an option <nextstate> tag to determine
1300: the next state.
1301:
1302: Example:
1303:
1304: <date variable="DUE_DATE" hoursminutes="1">
1305: <nextstate>choose_why</nextstate>
1306: </date>
1307:
1308: =cut
1309:
1310: no strict;
1311: @ISA = ("Apache::lonhelper::element");
1312: use strict;
1313:
1314: use Time::localtime;
1315:
1316: BEGIN {
1317: &Apache::lonhelper::register('Apache::lonhelper::date',
1318: ('date'));
1319: }
1320:
1321: # Don't need to override the "new" from element
1322: sub new {
1323: my $ref = Apache::lonhelper::element->new();
1324: bless($ref);
1325: }
1326:
1327: my @months = ("January", "February", "March", "April", "May", "June", "July",
1328: "August", "September", "October", "November", "December");
1329:
1330: # CONSTRUCTION: Construct the message element from the XML
1331: sub start_date {
1332: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1333:
1334: if ($target ne 'helper') {
1335: return '';
1336: }
1337:
1338: $paramHash->{'variable'} = $token->[2]{'variable'};
1339: $helper->declareVar($paramHash->{'variable'});
1340: $paramHash->{'hoursminutes'} = $token->[2]{'hoursminutes'};
1341: }
1342:
1343: sub end_date {
1344: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1345:
1346: if ($target ne 'helper') {
1347: return '';
1348: }
1349: Apache::lonhelper::date->new();
1350: return '';
1351: }
1352:
1353: sub render {
1354: my $self = shift;
1355: my $result = "";
1356: my $var = $self->{'variable'};
1357:
1358: my $date;
1359:
1360: # Default date: The current hour.
1361: $date = localtime();
1362: $date->min(0);
1363:
1364: if (defined $self->{ERROR_MSG}) {
1365: $result .= '<font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
1366: }
1367:
1368: # Month
1369: my $i;
1370: $result .= "<select name='${var}month'>\n";
1371: for ($i = 0; $i < 12; $i++) {
1372: if ($i == $date->mon) {
1373: $result .= "<option value='$i' selected>";
1374: } else {
1375: $result .= "<option value='$i'>";
1376: }
1377: $result .= $months[$i] . "</option>\n";
1378: }
1379: $result .= "</select>\n";
1380:
1381: # Day
1382: $result .= "<select name='${var}day'>\n";
1383: for ($i = 1; $i < 32; $i++) {
1384: if ($i == $date->mday) {
1385: $result .= '<option selected>';
1386: } else {
1387: $result .= '<option>';
1388: }
1389: $result .= "$i</option>\n";
1390: }
1391: $result .= "</select>,\n";
1392:
1393: # Year
1394: $result .= "<select name='${var}year'>\n";
1395: for ($i = 2000; $i < 2030; $i++) { # update this after 64-bit dates
1396: if ($date->year + 1900 == $i) {
1397: $result .= "<option selected>";
1398: } else {
1399: $result .= "<option>";
1400: }
1401: $result .= "$i</option>\n";
1402: }
1403: $result .= "</select>,\n";
1404:
1405: # Display Hours and Minutes if they are called for
1406: if ($self->{'hoursminutes'}) {
1407: # Build hour
1408: $result .= "<select name='${var}hour'>\n";
1409: $result .= "<option " . ($date->hour == 0 ? 'selected ':'') .
1410: " value='0'>midnight</option>\n";
1411: for ($i = 1; $i < 12; $i++) {
1412: if ($date->hour == $i) {
1413: $result .= "<option selected value='$i'>$i a.m.</option>\n";
1414: } else {
1415: $result .= "<option value='$i'>$i a.m</option>\n";
1416: }
1417: }
1418: $result .= "<option " . ($date->hour == 12 ? 'selected ':'') .
1419: " value='12'>noon</option>\n";
1420: for ($i = 13; $i < 24; $i++) {
1421: my $printedHour = $i - 12;
1422: if ($date->hour == $i) {
1423: $result .= "<option selected value='$i'>$printedHour p.m.</option>\n";
1424: } else {
1425: $result .= "<option value='$i'>$printedHour p.m.</option>\n";
1426: }
1427: }
1428:
1429: $result .= "</select> :\n";
1430:
1431: $result .= "<select name='${var}minute'>\n";
1432: for ($i = 0; $i < 60; $i++) {
1433: my $printedMinute = $i;
1434: if ($i < 10) {
1435: $printedMinute = "0" . $printedMinute;
1436: }
1437: if ($date->min == $i) {
1438: $result .= "<option selected>";
1439: } else {
1440: $result .= "<option>";
1441: }
1442: $result .= "$printedMinute</option>\n";
1443: }
1444: $result .= "</select>\n";
1445: }
1446:
1447: return $result;
1448:
1449: }
1450: # If a NEXTSTATE was given, switch to it
1451: sub postprocess {
1452: my $self = shift;
1453: my $var = $self->{'variable'};
1454: my $month = $ENV{'form.' . $var . 'month'};
1455: my $day = $ENV{'form.' . $var . 'day'};
1456: my $year = $ENV{'form.' . $var . 'year'};
1457: my $min = 0;
1458: my $hour = 0;
1459: if ($self->{'hoursminutes'}) {
1460: $min = $ENV{'form.' . $var . 'minute'};
1461: $hour = $ENV{'form.' . $var . 'hour'};
1462: }
1463:
1464: my $chosenDate = Time::Local::timelocal(0, $min, $hour, $day, $month, $year);
1465: # Check to make sure that the date was not automatically co-erced into a
1466: # valid date, as we want to flag that as an error
1467: # This happens for "Feb. 31", for instance, which is coerced to March 2 or
1468: # 3, depending on if it's a leapyear
1469: my $checkDate = localtime($chosenDate);
1470:
1471: if ($checkDate->mon != $month || $checkDate->mday != $day ||
1472: $checkDate->year + 1900 != $year) {
1473: $self->{ERROR_MSG} = "Can't use " . $months[$month] . " $day, $year as a "
1474: . "date because it doesn't exist. Please enter a valid date.";
1475: return 0;
1476: }
1477:
1478: $helper->{VARS}->{$var} = $chosenDate;
1479:
1480: if (defined($self->{NEXTSTATE})) {
1481: $helper->changeState($self->{NEXTSTATE});
1482: }
1483:
1484: return 1;
1485: }
1486: 1;
1487:
1488: package Apache::lonhelper::resource;
1489:
1490: =pod
1491:
1492: =head2 Element: resource
1493:
1494: <resource> elements allow the user to select one or multiple resources
1495: from the current course. You can filter out which resources they can view,
1496: and filter out which resources they can select. The course will always
1497: be displayed fully expanded, because of the difficulty of maintaining
1498: selections across folder openings and closings. If this is fixed, then
1499: the user can manipulate the folders.
1500:
1501: <resource> takes the standard variable attribute to control what helper
1502: variable stores the results. It also takes a "multichoice" attribute,
1503: which controls whether the user can select more then one resource. The
1504: "toponly" attribute controls whether the resource display shows just the
1505: resources in that sequence, or recurses into all sub-sequences, defaulting
1506: to false. The "suppressEmptySequences" attribute reflects the
1507: suppressEmptySequences argument to the render routine, which will cause
1508: folders that have all of their contained resources filtered out to also
1509: be filtered out.
1510:
1511: B<SUB-TAGS>
1512:
1513: =over 4
1514:
1515: =item * <filterfunc>: If you want to filter what resources are displayed
1516: to the user, use a filter func. The <filterfunc> tag should contain
1517: Perl code that when wrapped with "sub { my $res = shift; " and "}" is
1518: a function that returns true if the resource should be displayed,
1519: and false if it should be skipped. $res is a resource object.
1520: (See Apache::lonnavmaps documentation for information about the
1521: resource object.)
1522:
1523: =item * <choicefunc>: Same as <filterfunc>, except that controls whether
1524: the given resource can be chosen. (It is almost always a good idea to
1525: show the user the folders, for instance, but you do not always want to
1526: let the user select them.)
1527:
1528: =item * <nextstate>: Standard nextstate behavior.
1529:
1530: =item * <valuefunc>: This function controls what is returned by the resource
1531: when the user selects it. Like filterfunc and choicefunc, it should be
1532: a function fragment that when wrapped by "sub { my $res = shift; " and
1533: "}" returns a string representing what you want to have as the value. By
1534: default, the value will be the resource ID of the object ($res->{ID}).
1535:
1536: =item * <mapurl>: If the URL of a map is given here, only that map
1537: will be displayed, instead of the whole course.
1538:
1539: =back
1540:
1541: =cut
1542:
1543: no strict;
1544: @ISA = ("Apache::lonhelper::element");
1545: use strict;
1546:
1547: BEGIN {
1548: &Apache::lonhelper::register('Apache::lonhelper::resource',
1549: ('resource', 'filterfunc',
1550: 'choicefunc', 'valuefunc',
1551: 'mapurl'));
1552: }
1553:
1554: sub new {
1555: my $ref = Apache::lonhelper::element->new();
1556: bless($ref);
1557: }
1558:
1559: # CONSTRUCTION: Construct the message element from the XML
1560: sub start_resource {
1561: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1562:
1563: if ($target ne 'helper') {
1564: return '';
1565: }
1566:
1567: $paramHash->{'variable'} = $token->[2]{'variable'};
1568: $helper->declareVar($paramHash->{'variable'});
1569: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
1570: $paramHash->{'suppressEmptySequences'} = $token->[2]{'suppressEmptySequences'};
1571: $paramHash->{'toponly'} = $token->[2]{'toponly'};
1572: return '';
1573: }
1574:
1575: sub end_resource {
1576: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1577:
1578: if ($target ne 'helper') {
1579: return '';
1580: }
1581: if (!defined($paramHash->{FILTER_FUNC})) {
1582: $paramHash->{FILTER_FUNC} = sub {return 1;};
1583: }
1584: if (!defined($paramHash->{CHOICE_FUNC})) {
1585: $paramHash->{CHOICE_FUNC} = sub {return 1;};
1586: }
1587: if (!defined($paramHash->{VALUE_FUNC})) {
1588: $paramHash->{VALUE_FUNC} = sub {my $res = shift; return $res->{ID}; };
1589: }
1590: Apache::lonhelper::resource->new();
1591: return '';
1592: }
1593:
1594: sub start_filterfunc {
1595: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1596:
1597: if ($target ne 'helper') {
1598: return '';
1599: }
1600:
1601: my $contents = Apache::lonxml::get_all_text('/filterfunc',
1602: $parser);
1603: $contents = 'sub { my $res = shift; ' . $contents . '}';
1604: $paramHash->{FILTER_FUNC} = eval $contents;
1605: }
1606:
1607: sub end_filterfunc { return ''; }
1608:
1609: sub start_choicefunc {
1610: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1611:
1612: if ($target ne 'helper') {
1613: return '';
1614: }
1615:
1616: my $contents = Apache::lonxml::get_all_text('/choicefunc',
1617: $parser);
1618: $contents = 'sub { my $res = shift; ' . $contents . '}';
1619: $paramHash->{CHOICE_FUNC} = eval $contents;
1620: }
1621:
1622: sub end_choicefunc { return ''; }
1623:
1624: sub start_valuefunc {
1625: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1626:
1627: if ($target ne 'helper') {
1628: return '';
1629: }
1630:
1631: my $contents = Apache::lonxml::get_all_text('/valuefunc',
1632: $parser);
1633: $contents = 'sub { my $res = shift; ' . $contents . '}';
1634: $paramHash->{VALUE_FUNC} = eval $contents;
1635: }
1636:
1637: sub end_valuefunc { return ''; }
1638:
1639: sub start_mapurl {
1640: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1641:
1642: if ($target ne 'helper') {
1643: return '';
1644: }
1645:
1646: my $contents = Apache::lonxml::get_all_text('/mapurl',
1647: $parser);
1648: $paramHash->{MAP_URL} = $contents;
1649: }
1650:
1651: sub end_mapurl { return ''; }
1652:
1653: # A note, in case I don't get to this before I leave.
1654: # If someone complains about the "Back" button returning them
1655: # to the previous folder state, instead of returning them to
1656: # the previous helper state, the *correct* answer is for the helper
1657: # to keep track of how many times the user has manipulated the folders,
1658: # and feed that to the history.go() call in the helper rendering routines.
1659: # If done correctly, the helper itself can keep track of how many times
1660: # it renders the same states, so it doesn't go in just this state, and
1661: # you can lean on the browser back button to make sure it all chains
1662: # correctly.
1663: # Right now, though, I'm just forcing all folders open.
1664:
1665: sub render {
1666: my $self = shift;
1667: my $result = "";
1668: my $var = $self->{'variable'};
1669: my $curVal = $helper->{VARS}->{$var};
1670:
1671: my $buttons = '';
1672:
1673: if ($self->{'multichoice'}) {
1674: $result = <<SCRIPT;
1675: <script>
1676: function checkall(value, checkName) {
1677: for (i=0; i<document.forms.helpform.elements.length; i++) {
1678: ele = document.forms.helpform.elements[i];
1679: if (ele.name == checkName + '.forminput') {
1680: document.forms.helpform.elements[i].checked=value;
1681: }
1682: }
1683: }
1684: </script>
1685: SCRIPT
1686: $buttons = <<BUTTONS;
1687: <br />
1688: <input type="button" onclick="checkall(true, '$var')" value="Select All Resources" />
1689: <input type="button" onclick="checkall(false, '$var')" value="Unselect All Resources" />
1690: <br />
1691: BUTTONS
1692: }
1693:
1694: if (defined $self->{ERROR_MSG}) {
1695: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
1696: }
1697:
1698: $result .= $buttons;
1699:
1700: my $filterFunc = $self->{FILTER_FUNC};
1701: my $choiceFunc = $self->{CHOICE_FUNC};
1702: my $valueFunc = $self->{VALUE_FUNC};
1703: my $mapUrl = $self->{MAP_URL};
1704: my $multichoice = $self->{'multichoice'};
1705:
1706: # Create the composite function that renders the column on the nav map
1707: # have to admit any language that lets me do this can't be all bad
1708: # - Jeremy (Pythonista) ;-)
1709: my $checked = 0;
1710: my $renderColFunc = sub {
1711: my ($resource, $part, $params) = @_;
1712:
1713: my $inputType;
1714: if ($multichoice) { $inputType = 'checkbox'; }
1715: else {$inputType = 'radio'; }
1716:
1717: if (!&$choiceFunc($resource)) {
1718: return '<td> </td>';
1719: } else {
1720: my $col = "<td><input type='$inputType' name='${var}.forminput' ";
1721: if (!$checked && !$multichoice) {
1722: $col .= "checked ";
1723: $checked = 1;
1724: }
1725: if ($multichoice) { # all resources start checked; see bug 1174
1726: $col .= "checked ";
1727: $checked = 1;
1728: }
1729: $col .= "value='" .
1730: HTML::Entities::encode(&$valueFunc($resource))
1731: . "' /></td>";
1732: return $col;
1733: }
1734: };
1735:
1736: $ENV{'form.condition'} = !$self->{'toponly'};
1737: $result .=
1738: &Apache::lonnavmaps::render( { 'cols' => [$renderColFunc,
1739: Apache::lonnavmaps::resource()],
1740: 'showParts' => 0,
1741: 'filterFunc' => $filterFunc,
1742: 'resource_no_folder_link' => 1,
1743: 'suppressEmptySequences' => $self->{'suppressEmptySequences'},
1744: 'iterator_map' => $mapUrl }
1745: );
1746:
1747: $result .= $buttons;
1748:
1749: return $result;
1750: }
1751:
1752: sub postprocess {
1753: my $self = shift;
1754:
1755: if ($self->{'multichoice'} && !$helper->{VARS}->{$self->{'variable'}}) {
1756: $self->{ERROR_MSG} = 'You must choose at least one resource to continue.';
1757: return 0;
1758: }
1759:
1760: if (defined($self->{NEXTSTATE})) {
1761: $helper->changeState($self->{NEXTSTATE});
1762: }
1763:
1764: return 1;
1765: }
1766:
1767: 1;
1768:
1769: package Apache::lonhelper::student;
1770:
1771: =pod
1772:
1773: =head2 Element: student
1774:
1775: Student elements display a choice of students enrolled in the current
1776: course. Currently it is primitive; this is expected to evolve later.
1777:
1778: Student elements take three attributes: "variable", which means what
1779: it usually does, "multichoice", which if true allows the user
1780: to select multiple students, and "coursepersonnel" which if true
1781: adds the course personnel to the top of the student selection.
1782:
1783: =cut
1784:
1785: no strict;
1786: @ISA = ("Apache::lonhelper::element");
1787: use strict;
1788:
1789:
1790:
1791: BEGIN {
1792: &Apache::lonhelper::register('Apache::lonhelper::student',
1793: ('student'));
1794: }
1795:
1796: sub new {
1797: my $ref = Apache::lonhelper::element->new();
1798: bless($ref);
1799: }
1800:
1801: sub start_student {
1802: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1803:
1804: if ($target ne 'helper') {
1805: return '';
1806: }
1807:
1808: $paramHash->{'variable'} = $token->[2]{'variable'};
1809: $helper->declareVar($paramHash->{'variable'});
1810: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
1811: $paramHash->{'coursepersonnel'} = $token->[2]{'coursepersonnel'};
1812: if (defined($token->[2]{'nextstate'})) {
1813: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
1814: }
1815:
1816: }
1817:
1818: sub end_student {
1819: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
1820:
1821: if ($target ne 'helper') {
1822: return '';
1823: }
1824: Apache::lonhelper::student->new();
1825: }
1826:
1827: sub render {
1828: my $self = shift;
1829: my $result = '';
1830: my $buttons = '';
1831: my $var = $self->{'variable'};
1832:
1833: if ($self->{'multichoice'}) {
1834: $result = <<SCRIPT;
1835: <script>
1836: function checkall(value, checkName) {
1837: for (i=0; i<document.forms.helpform.elements.length; i++) {
1838: ele = document.forms.helpform.elements[i];
1839: if (ele.name == checkName + '.forminput') {
1840: document.forms.helpform.elements[i].checked=value;
1841: }
1842: }
1843: }
1844: </script>
1845: SCRIPT
1846: $buttons = <<BUTTONS;
1847: <br />
1848: <input type="button" onclick="checkall(true, '$var')" value="Select All Students" />
1849: <input type="button" onclick="checkall(false, '$var')" value="Unselect All Students" />
1850: <br />
1851: BUTTONS
1852: }
1853:
1854: if (defined $self->{ERROR_MSG}) {
1855: $result .= '<font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
1856: }
1857:
1858: my $choices = [];
1859:
1860: # Load up the non-students, if necessary
1861: if ($self->{'coursepersonnel'}) {
1862: my %coursepersonnel = Apache::lonnet::get_course_adv_roles();
1863: for (sort keys %coursepersonnel) {
1864: for my $role (split /,/, $coursepersonnel{$_}) {
1865: # extract the names so we can sort them
1866: my @people;
1867:
1868: for (split /,/, $role) {
1869: push @people, [split /:/, $role];
1870: }
1871:
1872: @people = sort { $a->[0] cmp $b->[0] } @people;
1873:
1874: for my $person (@people) {
1875: push @$choices, [join(':', @$person), $person->[0], '', $_];
1876: }
1877: }
1878: }
1879: }
1880:
1881: # Constants
1882: my $section = Apache::loncoursedata::CL_SECTION();
1883: my $fullname = Apache::loncoursedata::CL_FULLNAME();
1884:
1885: # Load up the students
1886: my $classlist = &Apache::loncoursedata::get_classlist();
1887: my @keys = keys %{$classlist};
1888: # Sort by: Section, name
1889: @keys = sort {
1890: if ($classlist->{$a}->[$section] ne $classlist->{$b}->[$section]) {
1891: return $classlist->{$a}->[$section] cmp $classlist->{$b}->[$section];
1892: }
1893: return $classlist->{$a}->[$fullname] cmp $classlist->{$b}->[$fullname];
1894: } @keys;
1895:
1896: # username, fullname, section, type
1897: for (@keys) {
1898: push @$choices, [$_, $classlist->{$_}->[$fullname],
1899: $classlist->{$_}->[$section], 'Student'];
1900: }
1901:
1902: my $name = $self->{'coursepersonnel'} ? 'Name' : 'Student Name';
1903: my $type = 'radio';
1904: if ($self->{'multichoice'}) { $type = 'checkbox'; }
1905: $result .= "<table cellspacing='2' cellpadding='2' border='0'>\n";
1906: $result .= "<tr><td></td><td align='center'><b>$name</b></td>".
1907: "<td align='center'><b>Section</b></td>" .
1908: "<td align='center'><b>Role</b></td></tr>";
1909:
1910: my $checked = 0;
1911: for my $choice (@$choices) {
1912: $result .= "<tr><td><input type='$type' name='" .
1913: $self->{'variable'} . '.forminput' . "'";
1914:
1915: if (!$self->{'multichoice'} && !$checked) {
1916: $result .= " checked ";
1917: $checked = 1;
1918: }
1919: $result .=
1920: " value='" . HTML::Entities::encode($choice->[0] . ':' . $choice->[2])
1921: . "' /></td><td>"
1922: . HTML::Entities::encode($choice->[1])
1923: . "</td><td align='center'>"
1924: . HTML::Entities::encode($choice->[2])
1925: . "</td>\n<td>"
1926: . HTML::Entities::encode($choice->[3]) . "</td></tr>\n";
1927: }
1928:
1929: $result .= "</table>\n\n";
1930: $result .= $buttons;
1931:
1932: return $result;
1933: }
1934:
1935: sub postprocess {
1936: my $self = shift;
1937:
1938: my $result = $ENV{'form.' . $self->{'variable'} . '.forminput'};
1939: if (!$result) {
1940: $self->{ERROR_MSG} = 'You must choose at least one student '.
1941: 'to continue.';
1942: return 0;
1943: }
1944:
1945: if (defined($self->{NEXTSTATE})) {
1946: $helper->changeState($self->{NEXTSTATE});
1947: }
1948:
1949: return 1;
1950: }
1951:
1952: 1;
1953:
1954: package Apache::lonhelper::files;
1955:
1956: =pod
1957:
1958: =head2 Element: files
1959:
1960: files allows the users to choose files from a given directory on the
1961: server. It is always multichoice and stores the result as a triple-pipe
1962: delimited entry in the helper variables.
1963:
1964: Since it is extremely unlikely that you can actually code a constant
1965: representing the directory you wish to allow the user to search, <files>
1966: takes a subroutine that returns the name of the directory you wish to
1967: have the user browse.
1968:
1969: files accepts the attribute "variable" to control where the files chosen
1970: are put. It accepts the attribute "multichoice" as the other attribute,
1971: defaulting to false, which if true will allow the user to select more
1972: then one choice.
1973:
1974: <files> accepts three subtags. One is the "nextstate" sub-tag that works
1975: as it does with the other tags. Another is a <filechoice> sub tag that
1976: is Perl code that, when surrounded by "sub {" and "}" will return a
1977: string representing what directory on the server to allow the user to
1978: choose files from. Finally, the <filefilter> subtag should contain Perl
1979: code that when surrounded by "sub { my $filename = shift; " and "}",
1980: returns a true value if the user can pick that file, or false otherwise.
1981: The filename passed to the function will be just the name of the file,
1982: with no path info.
1983:
1984: =cut
1985:
1986: no strict;
1987: @ISA = ("Apache::lonhelper::element");
1988: use strict;
1989:
1990: use Apache::lonpubdir; # for getTitleString
1991:
1992: BEGIN {
1993: &Apache::lonhelper::register('Apache::lonhelper::files',
1994: ('files', 'filechoice', 'filefilter'));
1995: }
1996:
1997: sub new {
1998: my $ref = Apache::lonhelper::element->new();
1999: bless($ref);
2000: }
2001:
2002: sub start_files {
2003: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2004:
2005: if ($target ne 'helper') {
2006: return '';
2007: }
2008: $paramHash->{'variable'} = $token->[2]{'variable'};
2009: $helper->declareVar($paramHash->{'variable'});
2010: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
2011: }
2012:
2013: sub end_files {
2014: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2015:
2016: if ($target ne 'helper') {
2017: return '';
2018: }
2019: if (!defined($paramHash->{FILTER_FUNC})) {
2020: $paramHash->{FILTER_FUNC} = sub { return 1; };
2021: }
2022: Apache::lonhelper::files->new();
2023: }
2024:
2025: sub start_filechoice {
2026: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2027:
2028: if ($target ne 'helper') {
2029: return '';
2030: }
2031: $paramHash->{'filechoice'} = Apache::lonxml::get_all_text('/filechoice',
2032: $parser);
2033: }
2034:
2035: sub end_filechoice { return ''; }
2036:
2037: sub start_filefilter {
2038: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2039:
2040: if ($target ne 'helper') {
2041: return '';
2042: }
2043:
2044: my $contents = Apache::lonxml::get_all_text('/filefilter',
2045: $parser);
2046: $contents = 'sub { my $filename = shift; ' . $contents . '}';
2047: $paramHash->{FILTER_FUNC} = eval $contents;
2048: }
2049:
2050: sub end_filefilter { return ''; }
2051:
2052: sub render {
2053: my $self = shift;
2054: my $result = '';
2055: my $var = $self->{'variable'};
2056:
2057: my $subdirFunc = eval('sub {' . $self->{'filechoice'} . '}');
2058: die 'Error in resource filter code for variable ' .
2059: {'variable'} . ', Perl said:' . $@ if $@;
2060:
2061: my $subdir = &$subdirFunc();
2062:
2063: my $filterFunc = $self->{FILTER_FUNC};
2064: my $buttons = '';
2065: my $type = 'radio';
2066: if ($self->{'multichoice'}) {
2067: $type = 'checkbox';
2068: }
2069:
2070: if ($self->{'multichoice'}) {
2071: $result = <<SCRIPT;
2072: <script>
2073: function checkall(value, checkName) {
2074: for (i=0; i<document.forms.helpform.elements.length; i++) {
2075: ele = document.forms.helpform.elements[i];
2076: if (ele.name == checkName + '.forminput') {
2077: document.forms.helpform.elements[i].checked=value;
2078: }
2079: }
2080: }
2081:
2082: function checkallclass(value, className) {
2083: for (i=0; i<document.forms.helpform.elements.length; i++) {
2084: ele = document.forms.helpform.elements[i];
2085: if (ele.type == "$type" && ele.onclick) {
2086: document.forms.helpform.elements[i].checked=value;
2087: }
2088: }
2089: }
2090: </script>
2091: SCRIPT
2092: $buttons = <<BUTTONS;
2093: <br />
2094: <input type="button" onclick="checkall(true, '$var')" value="Select All Files" />
2095: <input type="button" onclick="checkall(false, '$var')" value="Unselect All Files" />
2096: BUTTONS
2097:
2098: if ($helper->{VARS}->{'construction'}) {
2099: $buttons .= <<BUTTONS;
2100: <input type="button" onclick="checkallclass(true, 'Published')" value="Select All Published" />
2101: <input type="button" onclick="checkallclass(false, 'Published')" value="Unselect All Published" />
2102: <br />
2103: BUTTONS
2104: }
2105: }
2106:
2107: # Get the list of files in this directory.
2108: my @fileList;
2109:
2110: # If the subdirectory is in local CSTR space
2111: if ($subdir =~ m|/home/([^/]+)/public_html|) {
2112: my $user = $1;
2113: my $domain = $Apache::lonnet::perlvar{'lonDefDomain'};
2114: @fileList = &Apache::lonnet::dirlist($subdir, $domain, $user, '');
2115: } else {
2116: # local library server resource space
2117: @fileList = &Apache::lonnet::dirlist($subdir, $ENV{'user.domain'}, $ENV{'user.name'}, '');
2118: }
2119:
2120: $result .= $buttons;
2121:
2122: if (defined $self->{ERROR_MSG}) {
2123: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
2124: }
2125:
2126: $result .= '<table border="0" cellpadding="2" cellspacing="0">';
2127:
2128: # Keeps track if there are no choices, prints appropriate error
2129: # if there are none.
2130: my $choices = 0;
2131: # Print each legitimate file choice.
2132: for my $file (@fileList) {
2133: $file = (split(/&/, $file))[0];
2134: if ($file eq '.' || $file eq '..') {
2135: next;
2136: }
2137: my $fileName = $subdir .'/'. $file;
2138: if (&$filterFunc($file)) {
2139: my $status;
2140: my $color;
2141: if ($helper->{VARS}->{'construction'}) {
2142: ($status, $color) = @{fileState($subdir, $file)};
2143: } else {
2144: $status = '';
2145: $color = '';
2146: }
2147:
2148: # Get the title
2149: my $title = Apache::lonpubdir::getTitleString($fileName);
2150:
2151: # Netscape 4 is stupid and there's nowhere to put the
2152: # information on the input tag that the file is Published,
2153: # Unpublished, etc. In *real* browsers we can just say
2154: # "class='Published'" and check the className attribute of
2155: # the input tag, but Netscape 4 is too stupid to understand
2156: # that attribute, and un-comprehended attributes are not
2157: # reflected into the object model. So instead, what I do
2158: # is either have or don't have an "onclick" handler that
2159: # does nothing, give Published files the onclick handler, and
2160: # have the checker scripts check for that. Stupid and clumsy,
2161: # and only gives us binary "yes/no" information (at least I
2162: # couldn't figure out how to reach into the event handler's
2163: # actual code to retreive a value), but it works well enough
2164: # here.
2165:
2166: my $onclick = '';
2167: if ($status eq 'Published' && $helper->{VARS}->{'construction'}) {
2168: $onclick = 'onclick="a=1" ';
2169: }
2170: $result .= '<tr><td align="right"' . " bgcolor='$color'>" .
2171: "<input $onclick type='$type' name='" . $var
2172: . ".forminput' value='" . HTML::Entities::encode($fileName) .
2173: "'";
2174: if (!$self->{'multichoice'} && $choices == 0) {
2175: $result .= ' checked';
2176: }
2177: $result .= "/></td><td bgcolor='$color'>" . $file . "</td>" .
2178: "<td bgcolor='$color'>$title</td>" .
2179: "<td bgcolor='$color'>$status</td>" . "</tr>\n";
2180: $choices++;
2181: }
2182: }
2183:
2184: $result .= "</table>\n";
2185:
2186: if (!$choices) {
2187: $result .= '<font color="#FF0000">There are no files available to select in this directory. Please go back and select another option.</font><br /><br />';
2188: }
2189:
2190: $result .= $buttons;
2191:
2192: return $result;
2193: }
2194:
2195: # Determine the state of the file: Published, unpublished, modified.
2196: # Return the color it should be in and a label as a two-element array
2197: # reference.
2198: # Logic lifted from lonpubdir.pm, even though I don't know that it's still
2199: # the most right thing to do.
2200:
2201: sub fileState {
2202: my $constructionSpaceDir = shift;
2203: my $file = shift;
2204:
2205: my $docroot = $Apache::lonnet::perlvar{'lonDocRoot'};
2206: my $subdirpart = $constructionSpaceDir;
2207: $subdirpart =~ s/^\/home\/$ENV{'user.name'}\/public_html//;
2208: my $resdir = $docroot . '/res/' . $ENV{'user.domain'} . '/' . $ENV{'user.name'} .
2209: $subdirpart;
2210:
2211: my @constructionSpaceFileStat = stat($constructionSpaceDir . '/' . $file);
2212: my @resourceSpaceFileStat = stat($resdir . '/' . $file);
2213: if (!@resourceSpaceFileStat) {
2214: return ['Unpublished', '#FFCCCC'];
2215: }
2216:
2217: my $constructionSpaceFileModified = $constructionSpaceFileStat[9];
2218: my $resourceSpaceFileModified = $resourceSpaceFileStat[9];
2219:
2220: if ($constructionSpaceFileModified > $resourceSpaceFileModified) {
2221: return ['Modified', '#FFFFCC'];
2222: }
2223: return ['Published', '#CCFFCC'];
2224: }
2225:
2226: sub postprocess {
2227: my $self = shift;
2228: my $result = $ENV{'form.' . $self->{'variable'} . '.forminput'};
2229: if (!$result) {
2230: $self->{ERROR_MSG} = 'You must choose at least one file '.
2231: 'to continue.';
2232: return 0;
2233: }
2234:
2235: if (defined($self->{NEXTSTATE})) {
2236: $helper->changeState($self->{NEXTSTATE});
2237: }
2238:
2239: return 1;
2240: }
2241:
2242: 1;
2243:
2244: package Apache::lonhelper::section;
2245:
2246: =pod
2247:
2248: =head2 Element: section
2249:
2250: <section> allows the user to choose one or more sections from the current
2251: course.
2252:
2253: It takes the standard attributes "variable", "multichoice", and
2254: "nextstate", meaning what they do for most other elements.
2255:
2256: =cut
2257:
2258: no strict;
2259: @ISA = ("Apache::lonhelper::choices");
2260: use strict;
2261:
2262: BEGIN {
2263: &Apache::lonhelper::register('Apache::lonhelper::section',
2264: ('section'));
2265: }
2266:
2267: sub new {
2268: my $ref = Apache::lonhelper::choices->new();
2269: bless($ref);
2270: }
2271:
2272: sub start_section {
2273: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2274:
2275: if ($target ne 'helper') {
2276: return '';
2277: }
2278:
2279: $paramHash->{CHOICES} = [];
2280:
2281: $paramHash->{'variable'} = $token->[2]{'variable'};
2282: $helper->declareVar($paramHash->{'variable'});
2283: $paramHash->{'multichoice'} = $token->[2]{'multichoice'};
2284: if (defined($token->[2]{'nextstate'})) {
2285: $paramHash->{NEXTSTATE} = $token->[2]{'nextstate'};
2286: }
2287:
2288: # Populate the CHOICES element
2289: my %choices;
2290:
2291: my $section = Apache::loncoursedata::CL_SECTION();
2292: my $classlist = Apache::loncoursedata::get_classlist();
2293: foreach (keys %$classlist) {
2294: my $sectionName = $classlist->{$_}->[$section];
2295: if (!$sectionName) {
2296: $choices{"No section assigned"} = "";
2297: } else {
2298: $choices{$sectionName} = $sectionName;
2299: }
2300: }
2301:
2302: for my $sectionName (sort(keys(%choices))) {
2303:
2304: push @{$paramHash->{CHOICES}}, [$sectionName, $sectionName];
2305: }
2306: }
2307:
2308: sub end_section {
2309: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2310:
2311: if ($target ne 'helper') {
2312: return '';
2313: }
2314: Apache::lonhelper::section->new();
2315: }
2316: 1;
2317:
2318: package Apache::lonhelper::string;
2319:
2320: =pod
2321:
2322: =head2 Element: string
2323:
2324: string elements provide a string entry field for the user. string elements
2325: take the usual 'variable' and 'nextstate' parameters. string elements
2326: also pass through 'maxlength' and 'size' attributes to the input tag.
2327:
2328: string honors the defaultvalue tag, if given.
2329:
2330: string honors the validation function, if given.
2331:
2332: =cut
2333:
2334: no strict;
2335: @ISA = ("Apache::lonhelper::element");
2336: use strict;
2337:
2338: BEGIN {
2339: &Apache::lonhelper::register('Apache::lonhelper::string',
2340: ('string'));
2341: }
2342:
2343: sub new {
2344: my $ref = Apache::lonhelper::element->new();
2345: bless($ref);
2346: }
2347:
2348: # CONSTRUCTION: Construct the message element from the XML
2349: sub start_string {
2350: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2351:
2352: if ($target ne 'helper') {
2353: return '';
2354: }
2355:
2356: $paramHash->{'variable'} = $token->[2]{'variable'};
2357: $helper->declareVar($paramHash->{'variable'});
2358: $paramHash->{'nextstate'} = $token->[2]{'nextstate'};
2359: $paramHash->{'maxlength'} = $token->[2]{'maxlength'};
2360: $paramHash->{'size'} = $token->[2]{'size'};
2361:
2362: return '';
2363: }
2364:
2365: sub end_string {
2366: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2367:
2368: if ($target ne 'helper') {
2369: return '';
2370: }
2371: Apache::lonhelper::string->new();
2372: return '';
2373: }
2374:
2375: sub render {
2376: my $self = shift;
2377: my $result = '';
2378:
2379: if (defined $self->{ERROR_MSG}) {
2380: $result .= '<br /><font color="#FF0000">' . $self->{ERROR_MSG} . '</font><br /><br />';
2381: }
2382:
2383: $result .= '<input type="string" name="' . $self->{'variable'} . '.forminput"';
2384:
2385: if (defined($self->{'size'})) {
2386: $result .= ' size="' . $self->{'size'} . '"';
2387: }
2388: if (defined($self->{'maxlength'})) {
2389: $result .= ' maxlength="' . $self->{'maxlength'} . '"';
2390: }
2391:
2392: if (defined($self->{DEFAULT_VALUE})) {
2393: my $valueFunc = eval($self->{DEFAULT_VALUE});
2394: die 'Error in default value code for variable ' .
2395: $self->{'variable'} . ', Perl said: ' . $@ if $@;
2396: $result .= ' value="' . &$valueFunc($helper, $self) . '"';
2397: }
2398:
2399: $result .= ' />';
2400:
2401: return $result;
2402: }
2403:
2404: # If a NEXTSTATE was given, switch to it
2405: sub postprocess {
2406: my $self = shift;
2407:
2408: if (defined($self->{VALIDATOR})) {
2409: my $validator = eval($self->{VALIDATOR});
2410: die 'Died during evaluation of evaulation code; Perl said: ' . $@ if $@;
2411: my $invalid = &$validator($helper, $state, $self, $self->getValue());
2412: if ($invalid) {
2413: $self->{ERROR_MSG} = $invalid;
2414: return 0;
2415: }
2416: }
2417:
2418: if (defined($self->{'nextstate'})) {
2419: $helper->changeState($self->{'nextstate'});
2420: }
2421:
2422: return 1;
2423: }
2424:
2425: 1;
2426:
2427: package Apache::lonhelper::general;
2428:
2429: =pod
2430:
2431: =head2 General-purpose tag: <exec>
2432:
2433: The contents of the exec tag are executed as Perl code, not inside a
2434: safe space, so the full range of $ENV and such is available. The code
2435: will be executed as a subroutine wrapped with the following code:
2436:
2437: "sub { my $helper = shift; my $state = shift;" and
2438:
2439: "}"
2440:
2441: The return value is ignored.
2442:
2443: $helper is the helper object. Feel free to add methods to the helper
2444: object to support whatever manipulation you may need to do (for instance,
2445: overriding the form location if the state is the final state; see
2446: lonparm.helper for an example).
2447:
2448: $state is the $paramHash that has currently been generated and may
2449: be manipulated by the code in exec. Note that the $state is not yet
2450: an actual state B<object>, it is just a hash, so do not expect to
2451: be able to call methods on it.
2452:
2453: =cut
2454:
2455: BEGIN {
2456: &Apache::lonhelper::register('Apache::lonhelper::general',
2457: 'exec', 'condition', 'clause',
2458: 'eval');
2459: }
2460:
2461: sub start_exec {
2462: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2463:
2464: if ($target ne 'helper') {
2465: return '';
2466: }
2467:
2468: my $code = &Apache::lonxml::get_all_text('/exec', $parser);
2469:
2470: $code = eval ('sub { my $helper = shift; my $state = shift; ' .
2471: $code . "}");
2472: die 'Error in <exec>, Perl said: '. $@ if $@;
2473: &$code($helper, $paramHash);
2474: }
2475:
2476: sub end_exec { return ''; }
2477:
2478: =pod
2479:
2480: =head2 General-purpose tag: <condition>
2481:
2482: The <condition> tag allows you to mask out parts of the helper code
2483: depending on some programatically determined condition. The condition
2484: tag contains a tag <clause> which contains perl code that when wrapped
2485: with "sub { my $helper = shift; my $state = shift; " and "}", returns
2486: a true value if the XML in the condition should be evaluated as a normal
2487: part of the helper, or false if it should be completely discarded.
2488:
2489: The <clause> tag must be the first sub-tag of the <condition> tag or
2490: it will not work as expected.
2491:
2492: =cut
2493:
2494: # The condition tag just functions as a marker, it doesn't have
2495: # to "do" anything. Technically it doesn't even have to be registered
2496: # with the lonxml code, but I leave this here to be explicit about it.
2497: sub start_condition { return ''; }
2498: sub end_condition { return ''; }
2499:
2500: sub start_clause {
2501: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2502:
2503: if ($target ne 'helper') {
2504: return '';
2505: }
2506:
2507: my $clause = Apache::lonxml::get_all_text('/clause', $parser);
2508: $clause = eval('sub { my $helper = shift; my $state = shift; '
2509: . $clause . '}');
2510: die 'Error in clause of condition, Perl said: ' . $@ if $@;
2511: if (!&$clause($helper, $paramHash)) {
2512: # Discard all text until the /condition.
2513: &Apache::lonxml::get_all_text('/condition', $parser);
2514: }
2515: }
2516:
2517: sub end_clause { return ''; }
2518:
2519: =pod
2520:
2521: =head2 General-purpose tag: <eval>
2522:
2523: The <eval> tag will be evaluated as a subroutine call passed in the
2524: current helper object and state hash as described in <condition> above,
2525: but is expected to return a string to be printed directly to the
2526: screen. This is useful for dynamically generating messages.
2527:
2528: =cut
2529:
2530: # This is basically a type of message.
2531: # Programmatically setting $paramHash->{NEXTSTATE} would work, though
2532: # it's probably bad form.
2533:
2534: sub start_eval {
2535: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2536:
2537: if ($target ne 'helper') {
2538: return '';
2539: }
2540:
2541: my $program = Apache::lonxml::get_all_text('/eval', $parser);
2542: $program = eval('sub { my $helper = shift; my $state = shift; '
2543: . $program . '}');
2544: die 'Error in eval code, Perl said: ' . $@ if $@;
2545: $paramHash->{MESSAGE_TEXT} = &$program($helper, $paramHash);
2546: }
2547:
2548: sub end_eval {
2549: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2550:
2551: if ($target ne 'helper') {
2552: return '';
2553: }
2554:
2555: Apache::lonhelper::message->new();
2556: }
2557:
2558: 1;
2559:
2560: package Apache::lonhelper::final;
2561:
2562: =pod
2563:
2564: =head2 Element: final
2565:
2566: <final> is a special element that works with helpers that use the <finalcode>
2567: tag. It goes through all the states and elements, executing the <finalcode>
2568: snippets and collecting the results. Finally, it takes the user out of the
2569: helper, going to a provided page.
2570:
2571: If the parameter "restartCourse" is true, this will override the buttons and
2572: will make a "Finish Helper" button that will re-initialize the course for them,
2573: which is useful for the Course Initialization helper so the users never see
2574: the old values taking effect.
2575:
2576: =cut
2577:
2578: no strict;
2579: @ISA = ("Apache::lonhelper::element");
2580: use strict;
2581:
2582: BEGIN {
2583: &Apache::lonhelper::register('Apache::lonhelper::final',
2584: ('final', 'exitpage'));
2585: }
2586:
2587: sub new {
2588: my $ref = Apache::lonhelper::element->new();
2589: bless($ref);
2590: }
2591:
2592: sub start_final {
2593: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2594:
2595: if ($target ne 'helper') {
2596: return '';
2597: }
2598:
2599: $paramHash->{'restartCourse'} = $token->[2]{'restartCourse'};
2600:
2601: return '';
2602: }
2603:
2604: sub end_final {
2605: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2606:
2607: if ($target ne 'helper') {
2608: return '';
2609: }
2610:
2611: Apache::lonhelper::final->new();
2612:
2613: return '';
2614: }
2615:
2616: sub start_exitpage {
2617: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2618:
2619: if ($target ne 'helper') {
2620: return '';
2621: }
2622:
2623: $paramHash->{EXIT_PAGE} = &Apache::lonxml::get_all_text('/exitpage',
2624: $parser);
2625:
2626: return '';
2627: }
2628:
2629: sub end_exitpage { return ''; }
2630:
2631: sub render {
2632: my $self = shift;
2633:
2634: my @results;
2635:
2636: # Collect all the results
2637: for my $stateName (keys %{$helper->{STATES}}) {
2638: my $state = $helper->{STATES}->{$stateName};
2639:
2640: for my $element (@{$state->{ELEMENTS}}) {
2641: if (defined($element->{FINAL_CODE})) {
2642: # Compile the code.
2643: my $code = 'sub { my $helper = shift; my $element = shift; '
2644: . $element->{FINAL_CODE} . '}';
2645: $code = eval($code);
2646: die 'Error while executing final code for element with var ' .
2647: $element->{'variable'} . ', Perl said: ' . $@ if $@;
2648:
2649: my $result = &$code($helper, $element);
2650: if ($result) {
2651: push @results, $result;
2652: }
2653: }
2654: }
2655: }
2656:
2657: if (scalar(@results) == 0) {
2658: return '';
2659: }
2660:
2661: my $result = "<ul>\n";
2662: for my $re (@results) {
2663: $result .= ' <li>' . $re . "</li>\n";
2664: }
2665:
2666: if (!@results) {
2667: $result .= ' <li>No changes were made to current settings.</li>';
2668: }
2669:
2670: if ($self->{'restartCourse'}) {
2671: $result .= "<center>\n" .
2672: "<form action='/adm/roles' method='post' target='loncapaclient'>\n" .
2673: "<input type='button' onclick='history.go(-1)' value='<- Previous' />" .
2674: "<input type='hidden' name='orgurl' value='/adm/menu' />" .
2675: "<input type='hidden' name='selectrole' value='1' />\n" .
2676: "<input type='hidden' name='" . $ENV{'request.role'} .
2677: "' value='1' />\n<input type='submit' value='Finish Course Initialization' />\n" .
2678: "</form></center>";
2679: }
2680:
2681: return $result . '</ul>';
2682: }
2683:
2684: sub overrideForm {
2685: my $self = shift;
2686: return $self->{'restartCourse'};
2687: }
2688:
2689: 1;
2690:
2691: package Apache::lonhelper::parmwizfinal;
2692:
2693: # This is the final state for the parmwizard. It is not generally useful,
2694: # so it is not perldoc'ed. It does its own processing.
2695: # It is represented with <parmwizfinal />, and
2696: # should later be moved to lonparmset.pm .
2697:
2698: no strict;
2699: @ISA = ('Apache::lonhelper::element');
2700: use strict;
2701:
2702: BEGIN {
2703: &Apache::lonhelper::register('Apache::lonhelper::parmwizfinal',
2704: ('parmwizfinal'));
2705: }
2706:
2707: use Time::localtime;
2708:
2709: sub new {
2710: my $ref = Apache::lonhelper::choices->new();
2711: bless ($ref);
2712: }
2713:
2714: sub start_parmwizfinal { return ''; }
2715:
2716: sub end_parmwizfinal {
2717: my ($target,$token,$tagstack,$parstack,$parser,$safeeval,$style)=@_;
2718:
2719: if ($target ne 'helper') {
2720: return '';
2721: }
2722: Apache::lonhelper::parmwizfinal->new();
2723: }
2724:
2725: # Renders a form that, when submitted, will form the input to lonparmset.pm
2726: sub render {
2727: my $self = shift;
2728: my $vars = $helper->{VARS};
2729:
2730: # FIXME: Unify my designators with the standard ones
2731: my %dateTypeHash = ('open_date' => "Opening Date",
2732: 'due_date' => "Due Date",
2733: 'answer_date' => "Answer Date",
2734: 'tries' => 'Number of Tries'
2735: );
2736: my %parmTypeHash = ('open_date' => "0_opendate",
2737: 'due_date' => "0_duedate",
2738: 'answer_date' => "0_answerdate",
2739: 'tries' => '0_maxtries' );
2740:
2741: my $affectedResourceId = "";
2742: my $parm_name = $parmTypeHash{$vars->{ACTION_TYPE}};
2743: my $level = "";
2744: my $resourceString;
2745: my $symb;
2746: my $paramlevel;
2747:
2748: # Print the granularity, depending on the action
2749: if ($vars->{GRANULARITY} eq 'whole_course') {
2750: $resourceString .= '<li>for <b>all resources in the course</b></li>';
2751: $level = 9; # general course, see lonparmset.pm perldoc
2752: $affectedResourceId = "0.0";
2753: $symb = 'a';
2754: $paramlevel = 'general';
2755: } elsif ($vars->{GRANULARITY} eq 'map') {
2756: my $navmap = Apache::lonnavmaps::navmap->new(
2757: $ENV{"request.course.fn"}.".db",
2758: $ENV{"request.course.fn"}."_parms.db", 0, 0);
2759: my $res = $navmap->getByMapPc($vars->{RESOURCE_ID});
2760: my $title = $res->compTitle();
2761: $symb = $res->symb();
2762: $navmap->untieHashes();
2763: $resourceString .= "<li>for the map named <b>$title</b></li>";
2764: $level = 8;
2765: $affectedResourceId = $vars->{RESOURCE_ID};
2766: $paramlevel = 'map';
2767: } else {
2768: my $navmap = Apache::lonnavmaps::navmap->new(
2769: $ENV{"request.course.fn"}.".db",
2770: $ENV{"request.course.fn"}."_parms.db", 0, 0);
2771: my $res = $navmap->getById($vars->{RESOURCE_ID});
2772: $symb = $res->symb();
2773: my $title = $res->compTitle();
2774: $navmap->untieHashes();
2775: $resourceString .= "<li>for the resource named <b>$title</b></li>";
2776: $level = 7;
2777: $affectedResourceId = $vars->{RESOURCE_ID};
2778: $paramlevel = 'full';
2779: }
2780:
2781: my $result = "<form name='helpform' method='get' action='/adm/parmset#$affectedResourceId&$parm_name&$level'>\n";
2782: $result .= '<p>Confirm that this information is correct, then click "Finish Wizard" to complete setting the parameter.<ul>';
2783:
2784: # Print the type of manipulation:
2785: $result .= '<li>Setting the <b>' . $dateTypeHash{$vars->{ACTION_TYPE}} . '</b>';
2786: if ($vars->{ACTION_TYPE} eq 'tries') {
2787: $result .= ' to <b>' . $vars->{TRIES} . '</b>';
2788: }
2789: $result .= "</li>\n";
2790: if ($vars->{ACTION_TYPE} eq 'due_date' ||
2791: $vars->{ACTION_TYPE} eq 'answer_date') {
2792: # for due dates, we default to "date end" type entries
2793: $result .= "<input type='hidden' name='recent_date_end' " .
2794: "value='" . $vars->{PARM_DATE} . "' />\n";
2795: $result .= "<input type='hidden' name='pres_value' " .
2796: "value='" . $vars->{PARM_DATE} . "' />\n";
2797: $result .= "<input type='hidden' name='pres_type' " .
2798: "value='date_end' />\n";
2799: } elsif ($vars->{ACTION_TYPE} eq 'open_date') {
2800: $result .= "<input type='hidden' name='recent_date_start' ".
2801: "value='" . $vars->{PARM_DATE} . "' />\n";
2802: $result .= "<input type='hidden' name='pres_value' " .
2803: "value='" . $vars->{PARM_DATE} . "' />\n";
2804: $result .= "<input type='hidden' name='pres_type' " .
2805: "value='date_start' />\n";
2806: } elsif ($vars->{ACTION_TYPE} eq 'tries') {
2807: $result .= "<input type='hidden' name='pres_value' " .
2808: "value='" . $vars->{TRIES} . "' />\n";
2809: }
2810:
2811: $result .= $resourceString;
2812:
2813: # Print targets
2814: if ($vars->{TARGETS} eq 'course') {
2815: $result .= '<li>for <b>all students in course</b></li>';
2816: } elsif ($vars->{TARGETS} eq 'section') {
2817: my $section = $vars->{SECTION_NAME};
2818: $result .= "<li>for section <b>$section</b></li>";
2819: $level -= 3;
2820: $result .= "<input type='hidden' name='csec' value='" .
2821: HTML::Entities::encode($section) . "' />\n";
2822: } else {
2823: # FIXME: This is probably wasteful! Store the name!
2824: my $classlist = Apache::loncoursedata::get_classlist();
2825: my $username = $vars->{USER_NAME};
2826: # Chop off everything after the last colon (section)
2827: $username = substr($username, 0, rindex($username, ':'));
2828: my $name = $classlist->{$username}->[6];
2829: $result .= "<li>for <b>$name</b></li>";
2830: $level -= 6;
2831: my ($uname, $udom) = split /:/, $vars->{USER_NAME};
2832: $result .= "<input type='hidden' name='uname' value='".
2833: HTML::Entities::encode($uname) . "' />\n";
2834: $result .= "<input type='hidden' name='udom' value='".
2835: HTML::Entities::encode($udom) . "' />\n";
2836: }
2837:
2838: # Print value
2839: if ($vars->{ACTION_TYPE} ne 'tries') {
2840: $result .= "<li>to <b>" . ctime($vars->{PARM_DATE}) . "</b> (" .
2841: Apache::lonnavmaps::timeToHumanString($vars->{PARM_DATE})
2842: . ")</li>\n";
2843: }
2844:
2845: # print pres_marker
2846: $result .= "\n<input type='hidden' name='pres_marker'" .
2847: " value='$affectedResourceId&$parm_name&$level' />\n";
2848:
2849: # Make the table appear
2850: $result .= "\n<input type='hidden' value='true' name='prevvisit' />";
2851: $result .= "\n<input type='hidden' value='all' name='pschp' />";
2852: $result .= "\n<input type='hidden' value='$symb' name='pssymb' />";
2853: $result .= "\n<input type='hidden' value='$paramlevel' name='parmlev' />";
2854:
2855: $result .= "<br /><br /><center><input type='submit' value='Finish Helper' /></center></form>\n";
2856:
2857: return $result;
2858: }
2859:
2860: sub overrideForm {
2861: return 1;
2862: }
2863:
2864: 1;
2865:
2866: __END__
2867:
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