1: # The LearningOnline Network with CAPA
2: #
3: # $Id: lonstathelpers.pm,v 1.55 2008/09/14 15:16:29 raeburn Exp $
4: #
5: # Copyright Michigan State University Board of Trustees
6: #
7: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
8: #
9: # LON-CAPA is free software; you can redistribute it and/or modify
10: # it under the terms of the GNU General Public License as published by
11: # the Free Software Foundation; either version 2 of the License, or
12: # (at your option) any later version.
13: #
14: # LON-CAPA is distributed in the hope that it will be useful,
15: # but WITHOUT ANY WARRANTY; without even the implied warranty of
16: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17: # GNU General Public License for more details.
18: #
19: # You should have received a copy of the GNU General Public License
20: # along with LON-CAPA; if not, write to the Free Software
21: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22: #
23: # /home/httpd/html/adm/gpl.txt
24: #
25: # http://www.lon-capa.org/
26: #
27: ####################################################
28: ####################################################
29:
30: =pod
31:
32: =head1 NAME
33:
34: Apache::lonstathelpers - helper routines used by statistics
35:
36: =head1 SYNOPSIS
37:
38: This module provides a place to consolidate much of the statistics
39: routines that are needed across multiple statistics functions.
40:
41: =head1 OVERVIEW
42:
43: =over 4
44:
45: =cut
46:
47: ####################################################
48: ####################################################
49: package Apache::lonstathelpers;
50:
51: use strict;
52: use Apache::lonnet;
53: use Apache::loncommon();
54: use Apache::lonhtmlcommon();
55: use Apache::loncoursedata();
56: use Apache::lonstatistics;
57: use Apache::lonlocal;
58: use HTML::Entities();
59: use Time::Local();
60: use Spreadsheet::WriteExcel();
61: use GDBM_File;
62: use Storable qw(freeze thaw);
63: use lib '/home/httpd/lib/perl/';
64: use LONCAPA;
65:
66:
67: ####################################################
68: ####################################################
69:
70: =pod
71:
72: =item &render_resource($resource)
73:
74: Input: a navmaps resource
75:
76: Retunrs: a scalar containing html for a rendering of the problem
77: within a table.
78:
79: =cut
80:
81: ####################################################
82: ####################################################
83: sub render_resource {
84: my ($resource) = @_;
85: ##
86: ## Render the problem
87: my ($base) = ($resource->src =~ m|^(.*/)[^/]*$|);
88: $base="http://".$ENV{'SERVER_NAME'}.$base;
89: my ($src,$symb)=($resource->link,&escape($resource->shown_symb));
90: my $rendered_problem = &Apache::lonnet::ssi_body($src.'?symb='.$symb);
91: $rendered_problem =~ s/<\s*form\s*/<nop /g;
92: $rendered_problem =~ s|(<\s*/form\s*>)|<\/nop>|g;
93: return '<table bgcolor="ffffff"><tr><td>'.
94: '<base href="'.$base.'" />'.
95: $rendered_problem.
96: '</td></tr></table>';
97: }
98:
99: ####################################################
100: ####################################################
101:
102: =pod
103:
104: =item &get_resources
105:
106: =cut
107:
108: ####################################################
109: ####################################################
110: sub get_resources {
111: my ($navmap,$sequence) = @_;
112: my @resources = $navmap->retrieveResources($sequence,
113: sub { shift->is_problem(); },
114: 0,0,0);
115: return @resources;
116: }
117:
118: ####################################################
119: ####################################################
120:
121: =pod
122:
123: =item &problem_selector($AcceptedResponseTypes)
124:
125: Input: scalar containing regular expression which matches response
126: types to show. '.' will yield all, '(option|radiobutton)' will match
127: all option response and radiobutton problems.
128:
129: Returns: A string containing html for a table which lists the sequences
130: and their contents. A radiobutton is provided for each problem.
131: Skips 'survey' problems.
132:
133: =cut
134:
135: ####################################################
136: ####################################################
137: sub problem_selector {
138: my ($AcceptedResponseTypes,$sequence_addendum) = @_;
139: my $Str;
140: $Str = "\n<table>\n";
141: my $rb_count =0;
142: my ($navmap,@sequences) =
143: &Apache::lonstatistics::selected_sequences_with_assessments('all');
144: return $navmap if (! ref($navmap)); # error
145: foreach my $seq (@sequences) {
146: my $seq_str = '';
147: foreach my $res (&get_resources($navmap,$seq)) {
148: foreach my $part (@{$res->parts}) {
149: my @response_ids = $res->responseIds($part);
150: my @response_types = $res->responseType($part);
151: for (my $i=0;$i<scalar(@response_types);$i++){
152: my $respid = $response_ids[$i];
153: my $resptype = $response_types[$i];
154: if ($resptype =~ m/$AcceptedResponseTypes/) {
155: my $value = &make_target_id({symb=>$res->symb,
156: part=>$part,
157: respid=>$respid,
158: resptype=>$resptype});
159: my $checked = '';
160: if ($env{'form.problemchoice'} eq $value) {
161: $checked = 'checked ';
162: }
163: my $title = $res->compTitle;
164: if (! defined($title) || $title eq '') {
165: ($title) = ($res->src =~ m:/([^/]*)$:);
166: }
167: $seq_str .= '<tr>'.
168: qq{<td><input type="radio" id="$rb_count" name="problemchoice" value="$value" $checked /></td>}.
169: '<td><label for="'.$rb_count.'">'.$resptype.'</label></td>'.
170: '<td><label for="'.$rb_count.'">'.$title.'</label>';
171: if (scalar(@response_ids) > 1) {
172: $seq_str .= &mt('response').' '.$respid;
173: }
174: my $link = $res->link.'?symb='.&escape($res->shown_symb);
175: $seq_str .= (' 'x2).
176: qq{<a target="preview" href="$link">view</a>};
177: $seq_str .= "</td></tr>\n";
178: $rb_count++;
179: }
180: }
181: }
182: }
183: if ($seq_str ne '') {
184: $Str .= '<tr><td> </td>'.
185: '<td colspan="2"><b>'.$seq->compTitle.'</b></td>'.
186: "</tr>\n".$seq_str;
187: if (defined($sequence_addendum)) {
188: $Str .= '<tr>'.
189: ('<td> </td>'x2).
190: '<td align="right">'.$sequence_addendum.'</td>'.
191: "</tr>\n";
192: }
193: }
194: }
195: $Str .= "</table>\n";
196: return $Str;
197: }
198:
199: ####################################################
200: ####################################################
201:
202: =pod
203:
204: =item &MultipleProblemSelector($navmap,$selected,$inputname)
205:
206: Generate HTML with checkboxes for problem selection.
207:
208: Input:
209:
210: $navmap: a navmap object. If undef, navmaps will be called to create a
211: new object.
212:
213: $selected: Scalar, Array, or hash reference of currently selected items.
214:
215: $inputname: The name of the form elements to use for the checkboxs.
216:
217: Returns: A string containing html for a table which lists the sequences
218: and their contents. A checkbox is provided for each problem.
219:
220: =cut
221:
222: ####################################################
223: ####################################################
224: sub MultipleProblemSelector {
225: my ($navmap,$inputname,$formname)=@_;
226: my $cid = $env{'request.course.id'};
227: my $Str;
228: # Massage the input as needed.
229: if (! defined($navmap)) {
230: $navmap = Apache::lonnavmaps::navmap->new();
231: if (! defined($navmap)) {
232: $Str .=
233: '<h1>'.&mt('Error: cannot process course structure').'</h1>';
234: return $Str;
235: }
236: }
237: my $selected = {map { ($_,1) } (&get_selected_symbs($inputname))};
238: # Header
239: $Str .= <<"END";
240: <script language="JavaScript" type="text/javascript">
241: function checkall(value,seqid) {
242: for (i=0; i<document.forms.$formname.elements.length; i++) {
243: ele = document.forms.$formname.elements[i];
244: if (ele.name == '$inputname') {
245: if (seqid != null) {
246: itemid = document.forms.$formname.elements[i].id;
247: thing = itemid.split(':');
248: if (thing[0] == seqid) {
249: document.forms.$formname.elements[i].checked=value;
250: }
251: } else {
252: document.forms.$formname.elements[i].checked=value;
253: }
254: }
255: }
256: }
257: </script>
258: END
259: $Str .=
260: '<a href="javascript:checkall(true)">'.&mt('Select All').'</a>'.
261: (' 'x4).
262: '<a href="javascript:checkall(false)">'.&mt('Unselect All').'</a>';
263: $Str .= $/.'<table>'.$/;
264: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
265: my $sequence_string;
266: my $seq_id = 0;
267: my @Accumulator = (&new_accumulator($env{'course.'.$cid.'.description'},
268: '',
269: '',
270: $seq_id++,
271: $inputname));
272: my @Sequence_Data;
273: while (my $curRes = $iterator->next()) {
274: if ($curRes == $iterator->END_MAP) {
275: if (ref($Accumulator[-1]) eq 'CODE') {
276: my $old_accumulator = pop(@Accumulator);
277: push(@Sequence_Data,&{$old_accumulator}());
278: }
279: } elsif ($curRes == $iterator->BEGIN_MAP) {
280: # Not much to do here.
281: }
282: next if (! ref($curRes));
283: if ($curRes->is_map) {
284: push(@Accumulator,&new_accumulator($curRes->compTitle,
285: $curRes->src,
286: $curRes->symb,
287: $seq_id++,
288: $inputname));
289: } elsif ($curRes->is_problem) {
290: if (@Accumulator && $Accumulator[-1] ne '') {
291: &{$Accumulator[-1]}($curRes,
292: exists($selected->{$curRes->symb}));
293: }
294: }
295: }
296: my $course_seq = pop(@Sequence_Data);
297: foreach my $seq ($course_seq,@Sequence_Data) {
298: #my $seq = pop(@Sequence_Data);
299: next if (! defined($seq) || ref($seq) ne 'HASH');
300: $Str.= '<tr><td colspan="2">'.
301: '<b>'.$seq->{'title'}.'</b>'.(' 'x2).
302: '<a href="javascript:checkall(true,'.$seq->{'id'}.')">'.
303: &mt('Select').'</a>'.(' 'x2).
304: '<a href="javascript:checkall(false,'.$seq->{'id'}.')">'.
305: &mt('Unselect').'</a>'.(' 'x2).
306: '</td></tr>'.$/;
307: $Str.= $seq->{'html'};
308: }
309: $Str .= '</table>'.$/;
310: return $Str;
311: }
312:
313: sub new_accumulator {
314: my ($title,$src,$symb,$seq_id,$inputname) = @_;
315: my $target;
316: my $item_id=0;
317: return
318: sub {
319: if (@_) {
320: my ($res,$checked) = @_;
321: $target.='<tr><td><label>'.
322: '<input type="checkbox" name="'.$inputname.'" ';
323: if ($checked) {
324: $target .= 'checked ';
325: }
326: $target .= 'id="'.$seq_id.':'.$item_id++.'" ';
327: $target.=
328: 'value="'.&escape($res->symb).'" />'.
329: ' '.$res->compTitle.'</label>'.
330: (' 'x2).'<a target="preview" '.
331: 'href="'.$res->link.'?symb='.
332: &escape($res->shown_symb).'">view</a>'.
333: '</td></tr>'.$/;
334: } else {
335: if (defined($target)) {
336: return { title => $title,
337: symb => $symb,
338: src => $src,
339: id => $seq_id,
340: html => $target, };
341: }
342: return undef;
343: }
344: };
345: }
346:
347: sub get_selected_symbs {
348: my ($inputfield) = @_;
349: my $field = 'form.'.$inputfield;
350: my @symbs = (map {
351: &unescape($_);
352: } &Apache::loncommon::get_env_multiple($field));
353: return @symbs;
354: }
355:
356: ####################################################
357: ####################################################
358:
359: =pod
360:
361: =item &make_target_id($target)
362:
363: Inputs: Hash ref with the following entries:
364: $target->{'symb'}, $target->{'part'}, $target->{'respid'},
365: $target->{'resptype'}.
366:
367: Returns: A string, suitable for a form parameter, which uniquely identifies
368: the problem, part, and response to do statistical analysis on.
369:
370: Used by Apache::lonstathelpers::ProblemSelector().
371:
372: =cut
373:
374: ####################################################
375: ####################################################
376: sub make_target_id {
377: my ($target) = @_;
378: my $id = &escape($target->{'symb'}).':'.
379: &escape($target->{'part'}).':'.
380: &escape($target->{'respid'}).':'.
381: &escape($target->{'resptype'});
382: return $id;
383: }
384:
385: ####################################################
386: ####################################################
387:
388: =pod
389:
390: =item &get_target_from_id($id)
391:
392: Inputs: $id, a scalar string from Apache::lonstathelpers::make_target_id().
393:
394: Returns: A hash reference, $target, containing the following keys:
395: $target->{'symb'}, $target->{'part'}, $target->{'respid'},
396: $target->{'resptype'}.
397:
398: =cut
399:
400: ####################################################
401: ####################################################
402: sub get_target_from_id {
403: my ($id) = @_;
404: if (! ref($id)) {
405: my ($symb,$part,$respid,$resptype) = split(':',$id);
406: return ({ symb => &unescape($symb),
407: part => &unescape($part),
408: respid => &unescape($respid),
409: resptype => &unescape($resptype)});
410: } elsif (ref($id) eq 'ARRAY') {
411: my @Return;
412: foreach my $selected (@$id) {
413: my ($symb,$part,$respid,$resptype) = split(':',$selected);
414: push(@Return,{ symb => &unescape($symb),
415: part => &unescape($part),
416: respid => &unescape($respid),
417: resptype => &unescape($resptype)});
418: }
419: return \@Return;
420: }
421: }
422:
423: ####################################################
424: ####################################################
425:
426: =pod
427:
428: =item &get_prev_curr_next($target,$AcceptableResponseTypes,$granularity)
429:
430: Determine the problem parts or responses preceeding and following the
431: current resource.
432:
433: Inputs: $target (see &Apache::lonstathelpers::get_target_from_id())
434: $AcceptableResponseTypes, regular expression matching acceptable
435: response types,
436: $granularity, either 'part', 'response', 'part_survey', or 'part_task'
437:
438: Returns: three hash references, $prev, $curr, $next, which refer to the
439: preceeding, current, or following problem parts or responses, depending
440: on the value of $granularity. Values of undef indicate there is no
441: previous or next part/response. A value of undef for all three indicates
442: there was no match found to the current part/resource.
443:
444: The hash references contain the following keys:
445: symb, part, resource
446:
447: If $granularity eq 'response', the following ADDITIONAL keys will be present:
448: respid, resptype
449:
450: =cut
451:
452: ####################################################
453: ####################################################
454: sub get_prev_curr_next {
455: my ($target,$AcceptableResponseTypes,$granularity) = @_;
456: #
457: # Build an array with the data we need to search through
458: my @Resource;
459: my ($navmap,@sequences) =
460: &Apache::lonstatistics::selected_sequences_with_assessments('all');
461: return $navmap if (! ref($navmap));
462: foreach my $seq (@sequences) {
463: my @resources = &get_resources($navmap,$seq);
464: foreach my $res (@resources) {
465: foreach my $part (@{$res->parts}) {
466: if ($res->is_survey($part) && ($granularity eq 'part_survey')){
467: push (@Resource,
468: { symb => $res->symb,
469: part => $part,
470: resource => $res,
471: } );
472: } elsif ($res->is_task($part) && ($granularity eq 'part_task')){
473: push (@Resource,
474: { symb => $res->symb,
475: part => $part,
476: resource => $res,
477: } );
478: } elsif ($granularity eq 'part') {
479: push (@Resource,
480: { symb => $res->symb,
481: part => $part,
482: resource => $res,
483: } );
484: } elsif ($granularity eq 'response') {
485: my @response_ids = $res->responseIds($part);
486: my @response_types = $res->responseType($part);
487: for (my $i=0;
488: $i<scalar(@response_ids);
489: $i++){
490: my $respid = $response_ids[$i];
491: my $resptype = $response_types[$i];
492: next if ($resptype !~ m/$AcceptableResponseTypes/);
493: push (@Resource,
494: { symb => $res->symb,
495: part => $part,
496: respid => $respid,
497: resptype => $resptype,
498: resource => $res,
499: } );
500: }
501: }
502: }
503: }
504: }
505: #
506: # Get the index of the current situation
507: my $curr_idx;
508: for ($curr_idx=0;$curr_idx<$#Resource;$curr_idx++) {
509: my $curr_item = $Resource[$curr_idx];
510: if ($granularity =~ /^(part|part_survey|part_task)$/) {
511: if ($curr_item->{'symb'} eq $target->{'symb'} &&
512: $curr_item->{'part'} eq $target->{'part'}) {
513: last;
514: }
515: } elsif ($granularity eq 'response') {
516: if ($curr_item->{'symb'} eq $target->{'symb'} &&
517: $curr_item->{'part'} eq $target->{'part'} &&
518: $curr_item->{'respid'} eq $target->{'respid'} &&
519: $curr_item->{'resptype'} eq $target->{'resptype'}) {
520: last;
521: }
522: }
523: }
524: my $curr_item = $Resource[$curr_idx];
525: if ($granularity =~ /^(part|part_survey|part_task)$/) {
526: if ($curr_item->{'symb'} ne $target->{'symb'} ||
527: $curr_item->{'part'} ne $target->{'part'}) {
528: # bogus symb - return nothing
529: return (undef,undef,undef);
530: }
531: } elsif ($granularity eq 'response') {
532: if ($curr_item->{'symb'} ne $target->{'symb'} ||
533: $curr_item->{'part'} ne $target->{'part'} ||
534: $curr_item->{'respid'} ne $target->{'respid'} ||
535: $curr_item->{'resptype'} ne $target->{'resptype'}){
536: # bogus symb - return nothing
537: return (undef,undef,undef);
538: }
539: }
540: #
541: # Now just pick up the data we need
542: my ($prev,$curr,$next);
543: if ($curr_idx == 0) {
544: $prev = undef;
545: $curr = $Resource[$curr_idx ];
546: $next = $Resource[$curr_idx+1];
547: } elsif ($curr_idx == $#Resource) {
548: $prev = $Resource[$curr_idx-1];
549: $curr = $Resource[$curr_idx ];
550: $next = undef;
551: } else {
552: $prev = $Resource[$curr_idx-1];
553: $curr = $Resource[$curr_idx ];
554: $next = $Resource[$curr_idx+1];
555: }
556: return ($navmap,$prev,$curr,$next);
557: }
558:
559:
560: #####################################################
561: #####################################################
562:
563: =pod
564:
565: =item GetStudentAnswers($r,$problem,$Students)
566:
567: Determines the correct answer for a set of students on a given problem.
568: The students answers are stored in the student hashes pointed to by the
569: array @$Students under the key 'answer'.
570:
571: Inputs: $r
572: $problem: hash reference containing the keys 'resource', 'part', and 'respid'.
573: $Students: reference to array containing student hashes (need 'username',
574: 'domain').
575:
576: Returns: nothing
577:
578: =cut
579:
580: #####################################################
581: #####################################################
582: sub GetStudentAnswers {
583: my ($r,$problem,$Students,$formname,$inputname) = @_;
584: my %answers;
585: my $status_type;
586: if (defined($formname)) {
587: $status_type = 'inline';
588: } else {
589: $status_type = 'popup';
590: }
591: my $c = $r->connection();
592: my %Answers;
593: my ($resource,$partid,$respid) = ($problem->{'resource'},
594: $problem->{'part'},
595: $problem->{'respid'});
596: # Read in the cache (if it exists) before we start timing things.
597: &Apache::lonstathelpers::ensure_proper_cache($resource->{'symb'});
598: # Open progress window
599: my %prog_state=&Apache::lonhtmlcommon::Create_PrgWin
600: ($r,'Student Answer Compilation Status',
601: 'Student Answer Compilation Progress', scalar(@$Students),
602: $status_type,undef,$formname,$inputname);
603: $r->rflush();
604: foreach my $student (@$Students) {
605: last if ($c->aborted());
606: my $sname = $student->{'username'};
607: my $sdom = $student->{'domain'};
608: my $answer = &Apache::lonstathelpers::get_student_answer
609: ($resource,$sname,$sdom,$partid,$respid);
610: &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state,
611: &mt('last student'));
612: $answers{$answer}++;
613: $student->{'answer'} = $answer;
614: }
615: &Apache::lonstathelpers::write_analysis_cache();
616: return if ($c->aborted());
617: $r->rflush();
618: # close progress window
619: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
620: return \%answers;
621: }
622:
623: #####################################################
624: #####################################################
625:
626: =pod
627:
628: =item analyze_problem_as_student
629:
630: Analyzes a homework problem for a student
631:
632: Inputs: $resource: a resource object
633: $sname, $sdom, $partid, $respid
634:
635: Returns: the problem analysis hash
636:
637: =cut
638:
639: #####################################################
640: #####################################################
641: sub analyze_problem_as_student {
642: my ($resource,$sname,$sdom) = @_;
643: if (ref($resource) ne 'HASH') {
644: my $res = $resource;
645: $resource = { 'src' => $res->src,
646: 'symb' => $res->symb,
647: 'parts' => $res->parts };
648: foreach my $part (@{$resource->{'parts'}}) {
649: $resource->{'partdata'}->{$part}->{'ResponseIds'}=
650: [$res->responseIds($part)];
651: }
652: }
653: my $url = $resource->{'src'};
654: my $symb = $resource->{'symb'};
655: my $analysis = &get_from_analysis_cache($sname,$sdom,$symb);
656: if (! defined($analysis)) {
657: my $courseid = $env{'request.course.id'};
658: my $Answ=&Apache::lonnet::ssi($url,('grade_target' => 'analyze',
659: 'grade_domain' => $sdom,
660: 'grade_username' => $sname,
661: 'grade_symb' => $symb,
662: 'grade_courseid' => $courseid));
663: (my $garbage,$analysis)=split(/_HASH_REF__/,$Answ,2);
664: &store_analysis($sname,$sdom,$symb,$analysis);
665: }
666: my %Answer=&Apache::lonnet::str2hash($analysis);
667: #
668: return \%Answer;
669: }
670:
671: #####################################################
672: #####################################################
673:
674: =pod
675:
676: =item get_student_answer
677:
678: Analyzes a homework problem for a particular student and returns the correct
679: answer. Attempts to put together an answer for problem types
680: that do not natively support it.
681:
682: Inputs: $resource: a resource object (from navmaps or hash from loncoursedata)
683: $sname, $sdom, $partid, $respid
684:
685: Returns: $answer
686:
687: If $partid and $respid are specified, $answer is simply a scalar containing
688: the correct answer for the response.
689:
690: If $partid or $respid are undefined, $answer will be a hash reference with
691: keys $partid.'.'.$respid.'.answer'.
692:
693: =cut
694:
695: #####################################################
696: #####################################################
697: sub get_student_answer {
698: my ($resource,$sname,$sdom,$partid,$respid) = @_;
699: #
700: if (ref($resource) ne 'HASH') {
701: my $res = $resource;
702: $resource = { 'src' => $res->src,
703: 'symb' => $res->symb,
704: 'parts' => $res->parts };
705: foreach my $part (@{$resource->{'parts'}}) {
706: $resource->{'partdata'}->{$part}->{'ResponseIds'}=
707: [$res->responseIds($part)];
708: }
709: }
710: #
711: my $analysis =
712: &analyze_problem_as_student($resource,$sname,$sdom);
713: my $answer;
714: foreach my $partid (@{$resource->{'parts'}}) {
715: my $partdata = $resource->{'partdata'}->{$partid};
716: foreach my $respid (@{$partdata->{'ResponseIds'}}) {
717: my $prefix = $partid.'.'.$respid;
718: my $key = $prefix.'.answer';
719: $answer->{$partid}->{$respid} =
720: &get_answer($prefix,$key,%$analysis);
721: }
722: }
723: my $returnvalue;
724: if (! defined($partid)) {
725: $returnvalue = $answer;
726: } elsif (! defined($respid)) {
727: $returnvalue = $answer->{$partid};
728: } else {
729: $returnvalue = $answer->{$partid}->{$respid};
730: }
731: return $returnvalue;
732: }
733:
734: sub get_answer {
735: my ($prefix,$key,%Answer) = @_;
736: my $returnvalue;
737: if (exists($Answer{$key})) {
738: if (ref($Answer{$key}) eq 'HASH') {
739: my $which = 'INTERNAL';
740: if (!exists($Answer{$key}{$which})) {
741: $which = (sort(keys(%{ $Answer{$key} })))[0];
742: }
743: my $student_answer = $Answer{$key}{$which}[0][0];
744: $returnvalue = $student_answer;
745: } else {
746: &Apache::lonnet::logthis("error analyzing problem. got a answer of type ".ref($Answer{$key}));
747: }
748: } else {
749: if (exists($Answer{$prefix.'.shown'})) {
750: # The response has foils
751: my %values;
752: while (my ($k,$v) = each(%Answer)) {
753: next if ($k !~ /^$prefix\.foil\.(value|area)\.(.*)$/);
754: my $foilname = $2;
755: $values{$foilname}=$v;
756: }
757: foreach my $foil (@{$Answer{$prefix.'.shown'}}) {
758: if (ref($values{$foil}) eq 'ARRAY') {
759: $returnvalue.=&HTML::Entities::encode($foil,'<>&"').'='.
760: join(',',map {&HTML::Entities::encode($_,'<>&"')} @{$values{$foil}}).'&';
761: } else {
762: $returnvalue.=&HTML::Entities::encode($foil,'<>&"').'='.
763: &HTML::Entities::encode($values{$foil},'<>&"').'&';
764: }
765: }
766: $returnvalue =~ s/ /\%20/g;
767: chop ($returnvalue);
768: }
769: }
770: return $returnvalue;
771: }
772:
773: #####################################################
774: #####################################################
775:
776: =pod
777:
778: =item Caching routines
779:
780: =over 4
781:
782: =item &load_analysis_cache($symb)
783:
784: Loads the cache for the given symb into memory from disk.
785: Requires the cache filename be set.
786: Only should be called by &ensure_proper_cache.
787:
788: =cut
789:
790: #####################################################
791: #####################################################
792: {
793: my $cache_filename = undef;
794: my $current_symb = undef;
795: my %cache;
796:
797: sub load_analysis_cache {
798: my ($symb) = @_;
799: return if (! defined($cache_filename));
800: if (! defined($current_symb) || $current_symb ne $symb) {
801: undef(%cache);
802: my $storedstring;
803: my %cache_db;
804: if (tie(%cache_db,'GDBM_File',$cache_filename,&GDBM_READER(),0640)) {
805: $storedstring = $cache_db{&escape($symb)};
806: untie(%cache_db);
807: }
808: if (defined($storedstring)) {
809: %cache = %{thaw($storedstring)};
810: }
811: }
812: return;
813: }
814:
815: #####################################################
816: #####################################################
817:
818: =pod
819:
820: =item &get_from_analysis_cache($sname,$sdom,$symb,$partid,$respid)
821:
822: Returns the appropriate data from the cache, or undef if no data exists.
823:
824: =cut
825:
826: #####################################################
827: #####################################################
828: sub get_from_analysis_cache {
829: my ($sname,$sdom,$symb) = @_;
830: &ensure_proper_cache($symb);
831: my $returnvalue;
832: if (exists($cache{$sname.':'.$sdom})) {
833: $returnvalue = $cache{$sname.':'.$sdom};
834: } else {
835: $returnvalue = undef;
836: }
837: return $returnvalue;
838: }
839:
840: #####################################################
841: #####################################################
842:
843: =pod
844:
845: =item &write_analysis_cache($symb)
846:
847: Writes the in memory cache to disk so that it can be read in with
848: &load_analysis_cache($symb).
849:
850: =cut
851:
852: #####################################################
853: #####################################################
854: sub write_analysis_cache {
855: return if (! defined($current_symb) || ! defined($cache_filename));
856: my %cache_db;
857: my $key = &escape($current_symb);
858: if (tie(%cache_db,'GDBM_File',$cache_filename,&GDBM_WRCREAT(),0640)) {
859: my $storestring = freeze(\%cache);
860: $cache_db{$key}=$storestring;
861: $cache_db{$key.'.time'}=time;
862: untie(%cache_db);
863: }
864: undef(%cache);
865: undef($current_symb);
866: undef($cache_filename);
867: return;
868: }
869:
870: #####################################################
871: #####################################################
872:
873: =pod
874:
875: =item &ensure_proper_cache($symb)
876:
877: Called to make sure we have the proper cache set up. This is called
878: prior to every analysis lookup.
879:
880: =cut
881:
882: #####################################################
883: #####################################################
884: sub ensure_proper_cache {
885: my ($symb) = @_;
886: my $cid = $env{'request.course.id'};
887: my $new_filename = '/home/httpd/perl/tmp/'.
888: 'problemanalysis_'.$cid.'_analysis_cache.db';
889: if (! defined($cache_filename) ||
890: $cache_filename ne $new_filename ||
891: ! defined($current_symb) ||
892: $current_symb ne $symb) {
893: $cache_filename = $new_filename;
894: # Notice: $current_symb is not set to $symb until after the cache is
895: # loaded. This is what tells &load_analysis_cache to load in a new
896: # symb cache.
897: &load_analysis_cache($symb);
898: $current_symb = $symb;
899: }
900: }
901:
902: #####################################################
903: #####################################################
904:
905: =pod
906:
907: =item &store_analysis($sname,$sdom,$symb,$partid,$respid,$dataset)
908:
909: Stores the analysis data in the in memory cache.
910:
911: =cut
912:
913: #####################################################
914: #####################################################
915: sub store_analysis {
916: my ($sname,$sdom,$symb,$dataset) = @_;
917: return if ($symb ne $current_symb);
918: $cache{$sname.':'.$sdom}=$dataset;
919: return;
920: }
921:
922: }
923: #####################################################
924: #####################################################
925:
926: =pod
927:
928: =back
929:
930: =cut
931:
932: #####################################################
933: #####################################################
934:
935: ##
936: ## The following is copied from datecalc1.pl, part of the
937: ## Spreadsheet::WriteExcel CPAN module.
938: ##
939: ##
940: ######################################################################
941: #
942: # Demonstration of writing date/time cells to Excel spreadsheets,
943: # using UNIX/Perl time as source of date/time.
944: #
945: # Copyright 2000, Andrew Benham, adsb@bigfoot.com
946: #
947: ######################################################################
948: #
949: # UNIX/Perl time is the time since the Epoch (00:00:00 GMT, 1 Jan 1970)
950: # measured in seconds.
951: #
952: # An Excel file can use exactly one of two different date/time systems.
953: # In these systems, a floating point number represents the number of days
954: # (and fractional parts of the day) since a start point. The floating point
955: # number is referred to as a 'serial'.
956: # The two systems ('1900' and '1904') use different starting points:
957: # '1900'; '1.00' is 1 Jan 1900 BUT 1900 is erroneously regarded as
958: # a leap year - see:
959: # http://support.microsoft.com/support/kb/articles/Q181/3/70.asp
960: # for the excuse^H^H^H^H^H^Hreason.
961: # '1904'; '1.00' is 2 Jan 1904.
962: #
963: # The '1904' system is the default for Apple Macs. Windows versions of
964: # Excel have the option to use the '1904' system.
965: #
966: # Note that Visual Basic's "DateSerial" function does NOT erroneously
967: # regard 1900 as a leap year, and thus its serials do not agree with
968: # the 1900 serials of Excel for dates before 1 Mar 1900.
969: #
970: # Note that StarOffice (at least at version 5.2) does NOT erroneously
971: # regard 1900 as a leap year, and thus its serials do not agree with
972: # the 1900 serials of Excel for dates before 1 Mar 1900.
973: #
974: ######################################################################
975: #
976: # Calculation description
977: # =======================
978: #
979: # 1900 system
980: # -----------
981: # Unix time is '0' at 00:00:00 GMT 1 Jan 1970, i.e. 70 years after 1 Jan 1900.
982: # Of those 70 years, 17 (1904,08,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68)
983: # were leap years with an extra day.
984: # Thus there were 17 + 70*365 days = 25567 days between 1 Jan 1900 and
985: # 1 Jan 1970.
986: # In the 1900 system, '1' is 1 Jan 1900, but as 1900 was not a leap year
987: # 1 Jan 1900 should really be '2', so 1 Jan 1970 is '25569'.
988: #
989: # 1904 system
990: # -----------
991: # Unix time is '0' at 00:00:00 GMT 1 Jan 1970, i.e. 66 years after 1 Jan 1904.
992: # Of those 66 years, 17 (1904,08,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68)
993: # were leap years with an extra day.
994: # Thus there were 17 + 66*365 days = 24107 days between 1 Jan 1904 and
995: # 1 Jan 1970.
996: # In the 1904 system, 2 Jan 1904 being '1', 1 Jan 1970 is '24107'.
997: #
998: ######################################################################
999: #
1000: # Copyright (c) 2000, Andrew Benham.
1001: # This program is free software. It may be used, redistributed and/or
1002: # modified under the same terms as Perl itself.
1003: #
1004: # Andrew Benham, adsb@bigfoot.com
1005: # London, United Kingdom
1006: # 11 Nov 2000
1007: #
1008: ######################################################################
1009: #-----------------------------------------------------------
1010: # calc_serial()
1011: #
1012: # Called with (up to) 2 parameters.
1013: # 1. Unix timestamp. If omitted, uses current time.
1014: # 2. GMT flag. Set to '1' to return serial in GMT.
1015: # If omitted, returns serial in appropriate timezone.
1016: #
1017: # Returns date/time serial according to $DATE_SYSTEM selected
1018: #-----------------------------------------------------------
1019: sub calc_serial {
1020: # Use 1900 date system on all platforms other than Apple Mac (for which
1021: # use 1904 date system).
1022: my $DATE_SYSTEM = ($^O eq 'MacOS') ? 1 : 0;
1023: my $time = (defined $_[0]) ? $_[0] : time();
1024: my $gmtflag = (defined $_[1]) ? $_[1] : 0;
1025: #
1026: # Divide timestamp by number of seconds in a day.
1027: # This gives a date serial with '0' on 1 Jan 1970.
1028: my $serial = $time / 86400;
1029: #
1030: # Adjust the date serial by the offset appropriate to the
1031: # currently selected system (1900/1904).
1032: if ($DATE_SYSTEM == 0) { # use 1900 system
1033: $serial += 25569;
1034: } else { # use 1904 system
1035: $serial += 24107;
1036: }
1037: #
1038: unless ($gmtflag) {
1039: # Now have a 'raw' serial with the right offset. But this
1040: # gives a serial in GMT, which is false unless the timezone
1041: # is GMT. We need to adjust the serial by the appropriate
1042: # timezone offset.
1043: # Calculate the appropriate timezone offset by seeing what
1044: # the differences between localtime and gmtime for the given
1045: # time are.
1046: #
1047: my @gmtime = gmtime($time);
1048: my @ltime = localtime($time);
1049: #
1050: # For the first 7 elements of the two arrays, adjust the
1051: # date serial where the elements differ.
1052: for (0 .. 6) {
1053: my $diff = $ltime[$_] - $gmtime[$_];
1054: if ($diff) {
1055: $serial += _adjustment($diff,$_);
1056: }
1057: }
1058: }
1059: #
1060: # Perpetuate the error that 1900 was a leap year by decrementing
1061: # the serial if we're using the 1900 system and the date is prior to
1062: # 1 Mar 1900. This has the effect of making serial value '60'
1063: # 29 Feb 1900.
1064: #
1065: # This fix only has any effect if UNIX/Perl time on the platform
1066: # can represent 1900. Many can't.
1067: #
1068: unless ($DATE_SYSTEM) {
1069: $serial-- if ($serial < 61); # '61' is 1 Mar 1900
1070: }
1071: return $serial;
1072: }
1073:
1074: sub _adjustment {
1075: # Based on the difference in the localtime/gmtime array elements
1076: # number, return the adjustment required to the serial.
1077: #
1078: # We only look at some elements of the localtime/gmtime arrays:
1079: # seconds unlikely to be different as all known timezones
1080: # have an offset of integral multiples of 15 minutes,
1081: # but it's easy to do.
1082: # minutes will be different for timezone offsets which are
1083: # not an exact number of hours.
1084: # hours very likely to be different.
1085: # weekday will differ when localtime/gmtime difference
1086: # straddles midnight.
1087: #
1088: # Assume that difference between localtime and gmtime is less than
1089: # 5 days, then don't have to do maths for day of month, month number,
1090: # year number, etc...
1091: #
1092: my ($delta,$element) = @_;
1093: my $adjust = 0;
1094: #
1095: if ($element == 0) { # Seconds
1096: $adjust = $delta/86400; # 60 * 60 * 24
1097: } elsif ($element == 1) { # Minutes
1098: $adjust = $delta/1440; # 60 * 24
1099: } elsif ($element == 2) { # Hours
1100: $adjust = $delta/24; # 24
1101: } elsif ($element == 6) { # Day of week number
1102: # Catch difference straddling Sat/Sun in either direction
1103: $delta += 7 if ($delta < -4);
1104: $delta -= 7 if ($delta > 4);
1105: #
1106: $adjust = $delta;
1107: }
1108: return $adjust;
1109: }
1110:
1111: ###########################################################
1112: ###########################################################
1113:
1114: =pod
1115:
1116: =item get_problem_data
1117:
1118: Returns a data structure describing the problem.
1119:
1120: Inputs: $url
1121:
1122: Returns: %Partdata
1123:
1124: =cut
1125:
1126: ## note: we must force each foil and option to not begin or end with
1127: ## spaces as they are stored without such data.
1128: ##
1129: ###########################################################
1130: ###########################################################
1131: sub get_problem_data {
1132: my ($url) = @_;
1133: my $Answ=&Apache::lonnet::ssi($url,('grade_target' => 'analyze'));
1134: (my $garbage,$Answ)=split(/_HASH_REF__/,$Answ,2);
1135: my %Answer;
1136: %Answer=&Apache::lonnet::str2hash($Answ);
1137: my %Partdata;
1138: foreach my $part (@{$Answer{'parts'}}) {
1139: while (my($key,$value) = each(%Answer)) {
1140: #
1141: # Logging code:
1142: if (0) {
1143: &Apache::lonnet::logthis($part.' got key "'.$key.'"');
1144: if (ref($value) eq 'ARRAY') {
1145: &Apache::lonnet::logthis(' @'.join(',',@$value));
1146: } else {
1147: &Apache::lonnet::logthis(' '.$value);
1148: }
1149: }
1150: # End of logging code
1151: next if ($key !~ /^\Q$part\E/);
1152: $key =~ s/^\Q$part\E\.//;
1153: if (ref($value) eq 'ARRAY') {
1154: if ($key eq 'options') {
1155: $Partdata{$part}->{'_Options'}=$value;
1156: } elsif ($key eq 'concepts') {
1157: $Partdata{$part}->{'_Concepts'}=$value;
1158: } elsif ($key eq 'items') {
1159: $Partdata{$part}->{'_Items'}=$value;
1160: } elsif ($key =~ /^concept\.(.*)$/) {
1161: my $concept = $1;
1162: foreach my $foil (@$value) {
1163: $Partdata{$part}->{'_Foils'}->{$foil}->{'_Concept'}=
1164: $concept;
1165: }
1166: } elsif ($key =~ /^(unit|incorrect|answer|ans_low|ans_high|str_type)$/) {
1167: $Partdata{$part}->{$key}=$value;
1168: }
1169: } else {
1170: if ($key=~ /^foil\.text\.(.*)$/) {
1171: my $foil = $1;
1172: $Partdata{$part}->{'_Foils'}->{$foil}->{'name'}=$foil;
1173: $value =~ s/(\s*$|^\s*)//g;
1174: $Partdata{$part}->{'_Foils'}->{$foil}->{'text'}=$value;
1175: } elsif ($key =~ /^foil\.value\.(.*)$/) {
1176: my $foil = $1;
1177: $Partdata{$part}->{'_Foils'}->{$foil}->{'value'}=$value;
1178: } elsif ($key eq 'answercomputed') {
1179: $Partdata{$part}->{'answercomputed'} = $value;
1180: }
1181: }
1182: }
1183: }
1184: # Further debugging code
1185: if (0) {
1186: &Apache::lonnet::logthis('lonstathelpers::get_problem_data');
1187: &log_hash_ref(\%Partdata);
1188: }
1189: return %Partdata;
1190: }
1191:
1192: sub log_array_ref {
1193: my ($arrayref,$prefix) = @_;
1194: return if (ref($arrayref) ne 'ARRAY');
1195: if (! defined($prefix)) { $prefix = ''; };
1196: foreach my $v (@$arrayref) {
1197: if (ref($v) eq 'ARRAY') {
1198: &log_array_ref($v,$prefix.' ');
1199: } elsif (ref($v) eq 'HASH') {
1200: &log_hash_ref($v,$prefix.' ');
1201: } else {
1202: &Apache::lonnet::logthis($prefix.'"'.$v.'"');
1203: }
1204: }
1205: }
1206:
1207: sub log_hash_ref {
1208: my ($hashref,$prefix) = @_;
1209: return if (ref($hashref) ne 'HASH');
1210: if (! defined($prefix)) { $prefix = ''; };
1211: while (my ($k,$v) = each(%$hashref)) {
1212: if (ref($v) eq 'ARRAY') {
1213: &Apache::lonnet::logthis($prefix.'"'.$k.'" = array');
1214: &log_array_ref($v,$prefix.' ');
1215: } elsif (ref($v) eq 'HASH') {
1216: &Apache::lonnet::logthis($prefix.'"'.$k.'" = hash');
1217: &log_hash_ref($v,$prefix.' ');
1218: } else {
1219: &Apache::lonnet::logthis($prefix.'"'.$k.'" => "'.$v.'"');
1220: }
1221: }
1222: }
1223: ####################################################
1224: ####################################################
1225:
1226: =pod
1227:
1228: =item &limit_by_time()
1229:
1230: =cut
1231:
1232: ####################################################
1233: ####################################################
1234: sub limit_by_time_form {
1235: my $Starttime_form = '';
1236: my $starttime = &Apache::lonhtmlcommon::get_date_from_form
1237: ('limitby_startdate');
1238: my $endtime = &Apache::lonhtmlcommon::get_date_from_form
1239: ('limitby_enddate');
1240: if (! defined($endtime)) {
1241: $endtime = time;
1242: }
1243: if (! defined($starttime)) {
1244: $starttime = $endtime - 60*60*24*7;
1245: }
1246: my $state;
1247: if (&limit_by_time()) {
1248: $state = '';
1249: } else {
1250: $state = 'disabled';
1251: }
1252: my $startdateform = &Apache::lonhtmlcommon::date_setter
1253: ('Statistics','limitby_startdate',$starttime,undef,undef,$state);
1254: my $enddateform = &Apache::lonhtmlcommon::date_setter
1255: ('Statistics','limitby_enddate',$endtime,undef,undef,$state);
1256: my $Str;
1257: $Str .= '<script language="Javascript" >';
1258: $Str .= 'function toggle_limitby_activity(state) {';
1259: $Str .= ' if (state) {';
1260: $Str .= ' limitby_startdate_enable();';
1261: $Str .= ' limitby_enddate_enable();';
1262: $Str .= ' } else {';
1263: $Str .= ' limitby_startdate_disable();';
1264: $Str .= ' limitby_enddate_disable();';
1265: $Str .= ' }';
1266: $Str .= '}';
1267: $Str .= '</script>';
1268: $Str .= '<fieldset>';
1269: my $timecheckbox = '<input type="checkbox" name="limit_by_time" ';
1270: if (&limit_by_time()) {
1271: $timecheckbox .= ' checked ';
1272: }
1273: $timecheckbox .= 'OnChange="javascript:toggle_limitby_activity(this.checked);" ';
1274: $timecheckbox .= ' />';
1275: $Str .= '<legend><label>'.&mt('[_1] Limit by time',$timecheckbox).'</label></legend>';
1276: $Str .= &mt('Start Time: [_1]',$startdateform).'<br />';
1277: $Str .= &mt(' End Time: [_1]',$enddateform).'<br />';
1278: $Str .= '</fieldset>';
1279: return $Str;
1280: }
1281:
1282: sub limit_by_time {
1283: if (exists($env{'form.limit_by_time'}) &&
1284: $env{'form.limit_by_time'} ne '' ) {
1285: return 1;
1286: } else {
1287: return 0;
1288: }
1289: }
1290:
1291: sub get_time_limits {
1292: my $starttime = &Apache::lonhtmlcommon::get_date_from_form
1293: ('limitby_startdate');
1294: my $endtime = &Apache::lonhtmlcommon::get_date_from_form
1295: ('limitby_enddate');
1296: return ($starttime,$endtime);
1297: }
1298:
1299: ####################################################
1300: ####################################################
1301:
1302: =pod
1303:
1304: =item &manage_caches
1305:
1306: Inputs: $r, apache request object
1307:
1308: Returns: An array of scalars containing html for buttons.
1309:
1310: =cut
1311:
1312: ####################################################
1313: ####################################################
1314: sub manage_caches {
1315: my ($r,$formname,$inputname,$update_message) = @_;
1316: &Apache::loncoursedata::clear_internal_caches();
1317: my $sectionkey =
1318: join(',',
1319: map {
1320: &escape($_);
1321: } sort(&Apache::lonstatistics::get_selected_sections())
1322: );
1323: my $statuskey = $Apache::lonstatistics::enrollment_status;
1324: if (exists($env{'form.ClearCache'}) ||
1325: exists($env{'form.updatecaches'}) ||
1326: (exists($env{'form.firstrun'}) && $env{'form.firstrun'} ne 'no') ||
1327: (exists($env{'form.prevsection'}) &&
1328: $env{'form.prevsection'} ne $sectionkey) ||
1329: (exists($env{'form.prevenrollstatus'}) &&
1330: $env{'form.prevenrollstatus'} ne $statuskey)
1331: ) {
1332: if (defined($update_message)) {
1333: $r->print($update_message);
1334: }
1335: if (0) {
1336: &Apache::lonnet::logthis('Updating mysql student data caches');
1337: }
1338: &gather_full_student_data($r,$formname,$inputname);
1339: }
1340: #
1341: my @Buttons =
1342: ('<input type="submit" name="ClearCache" '.
1343: 'value="'.&mt('Clear Caches').'" />',
1344: '<input type="submit" name="updatecaches" '.
1345: 'value="'.&mt('Update Caches').'" />'.
1346: &Apache::loncommon::help_open_topic('Statistics_Cache'),
1347: '<input type="hidden" name="prevsection" value="'.$sectionkey.'" />',
1348: '<input type="hidden" name="prevenrollstatus" value="'.$statuskey.'" />'
1349: );
1350: #
1351: if (! exists($env{'form.firstrun'})) {
1352: $r->print('<input type="hidden" name="firstrun" value="yes" />');
1353: } else {
1354: $r->print('<input type="hidden" name="firstrun" value="no" />');
1355: }
1356: #
1357: return @Buttons;
1358: }
1359:
1360: sub gather_full_student_data {
1361: my ($r,$formname,$inputname) = @_;
1362: my $status_type;
1363: if (defined($formname)) {
1364: $status_type = 'inline';
1365: } else {
1366: $status_type = 'popup';
1367: }
1368: my $c = $r->connection();
1369: #
1370: &Apache::loncoursedata::clear_internal_caches();
1371: #
1372: my @Students = @Apache::lonstatistics::Students;
1373: #
1374: # Open the progress window
1375: my %prog_state=&Apache::lonhtmlcommon::Create_PrgWin
1376: ($r,&mt('Student Data Compilation Status'),
1377: &mt('Student Data Compilation Progress'), scalar(@Students),
1378: $status_type,undef,$formname,$inputname);
1379: #
1380: while (my $student = shift @Students) {
1381: return if ($c->aborted());
1382: my $status = &Apache::loncoursedata::ensure_current_full_data
1383: ($student->{'username'},$student->{'domain'},
1384: $env{'request.course.id'});
1385: &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state,
1386: &mt('last student'));
1387: }
1388: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
1389: $r->rflush();
1390: return;
1391: }
1392:
1393: ####################################################
1394: ####################################################
1395:
1396: =pod
1397:
1398: =item &submission_report_form
1399:
1400: Input: The originating reportSelected value for the current stats page.
1401:
1402: Output: Scalar containing HTML with needed form elements and a link to
1403: the student submission reports page.
1404:
1405: =cut
1406:
1407: ####################################################
1408: ####################################################
1409: sub submission_report_form {
1410: my ($original_report) = @_;
1411: # Note: In the link below we change the reportSelected value. If
1412: # the user hits the 'back' button on the browser after getting their
1413: # student submissions report, this value may still be around. So we
1414: # output a script block to set it properly. If the $original_report
1415: # value is unset, you are just asking for trouble.
1416: if (! defined($original_report)) {
1417: &Apache::lonnet::logthis
1418: ('someone called lonstathelpers::submission_report_form without '.
1419: ' enough input.');
1420: }
1421: my $html = $/.
1422: '<script type="Text/JavaScript">'.
1423: "document.Statistics.reportSelected.value='$original_report';".
1424: '</script>'.
1425: '<input type="hidden" name="correctans" value="true" />'.
1426: '<input type="hidden" name="prob_status" value="true" />'.
1427: '<input type="hidden" name="all_sub" value="true" />';
1428: my $output_selector = $/.'<select name="output">'.$/;
1429: foreach ('HTML','Excel','CSV') {
1430: $output_selector .= ' <option value="'.lc($_).'"';
1431: if ($env{'form.output'} eq lc($_)) {
1432: $output_selector .= ' selected ';
1433: }
1434: $output_selector .='>'.&mt($_).'</option>'.$/;
1435: }
1436: $output_selector .= '</select>'.$/;
1437: my $link = '<a href="javascript:'.
1438: q{document.Statistics.reportSelected.value='student_submission_reports';}.
1439: 'document.Statistics.submit();">';
1440: $html.= &mt('View data as [_1] [_2]go[_3]',$output_selector,
1441: $link,'</a>').$/;
1442: return $html
1443: }
1444:
1445: ####################################################
1446: ####################################################
1447:
1448: =pod
1449:
1450: =back
1451:
1452: =cut
1453:
1454: ####################################################
1455: ####################################################
1456:
1457: 1;
1458:
1459: __END__
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