1: # The LearningOnline Network with CAPA
2: #
3: # $Id: lonstathelpers.pm,v 1.43 2005/03/10 16:58:52 matthew 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:
64: ####################################################
65: ####################################################
66:
67: =pod
68:
69: =item &render_resource($resource)
70:
71: Input: a navmaps resource
72:
73: Retunrs: a scalar containing html for a rendering of the problem
74: within a table.
75:
76: =cut
77:
78: ####################################################
79: ####################################################
80: sub render_resource {
81: my ($resource) = @_;
82: ##
83: ## Render the problem
84: my ($base) = ($resource->src =~ m|^(.*/)[^/]*$|);
85: $base="http://".$ENV{'SERVER_NAME'}.$base;
86: my ($src,$symb)=($resource->src,&Apache::lonnet::escape($resource->symb));
87: my $rendered_problem = &Apache::lonnet::ssi_body($src.'?symb='.$symb);
88: $rendered_problem =~ s/<\s*form\s*/<nop /g;
89: $rendered_problem =~ s|(<\s*/form\s*>)|<\/nop>|g;
90: return '<table bgcolor="ffffff"><tr><td>'.
91: '<base href="'.$base.'" />'.
92: $rendered_problem.
93: '</td></tr></table>';
94: }
95:
96: ####################################################
97: ####################################################
98:
99: =pod
100:
101: =item &get_resources
102:
103: =cut
104:
105: ####################################################
106: ####################################################
107: sub get_resources {
108: my ($navmap,$sequence) = @_;
109: my @resources = $navmap->retrieveResources($sequence,
110: sub { shift->is_problem(); },
111: 0,0,0);
112: return @resources;
113: }
114:
115: ####################################################
116: ####################################################
117:
118: =pod
119:
120: =item &problem_selector($AcceptedResponseTypes)
121:
122: Input: scalar containing regular expression which matches response
123: types to show. '.' will yield all, '(option|radiobutton)' will match
124: all option response and radiobutton problems.
125:
126: Returns: A string containing html for a table which lists the sequences
127: and their contents. A radiobutton is provided for each problem.
128: Skips 'survey' problems.
129:
130: =cut
131:
132: ####################################################
133: ####################################################
134: sub problem_selector {
135: my ($AcceptedResponseTypes) = @_;
136: my $Str;
137: $Str = "\n<table>\n";
138: my $rb_count =0;
139: my ($navmap,@sequences) =
140: &Apache::lonstatistics::selected_sequences_with_assessments('all');
141: return $navmap if (! ref($navmap)); # error
142: foreach my $seq (@sequences) {
143: my $seq_str = '';
144: foreach my $res (&get_resources($navmap,$seq)) {
145: foreach my $part (@{$res->parts}) {
146: my @response_ids = $res->responseIds($part);
147: my @response_types = $res->responseType($part);
148: for (my $i=0;$i<scalar(@response_types);$i++){
149: my $respid = $response_ids[$i];
150: my $resptype = $response_types[$i];
151: if ($resptype =~ m/$AcceptedResponseTypes/) {
152: my $value = &make_target_id({symb=>$res->symb,
153: part=>$part,
154: respid=>$respid,
155: resptype=>$resptype});
156: my $checked = '';
157: if ($ENV{'form.problemchoice'} eq $value) {
158: $checked = 'checked ';
159: }
160: my $title = $res->compTitle;
161: if (! defined($title) || $title eq '') {
162: ($title) = ($res->src =~ m:/([^/]*)$:);
163: }
164: $seq_str .= '<tr>'.
165: qq{<td><input type="radio" id="$rb_count" name="problemchoice" value="$value" $checked /></td>}.
166: '<td><label for="'.$rb_count.'">'.$resptype.'</label></td>'.
167: '<td><label for="'.$rb_count.'">'.$title.'</label>';
168: if (scalar(@response_ids) > 1) {
169: $seq_str .= &mt('response').' '.$respid;
170: }
171: my $link = $res->src.'?symb='.
172: &Apache::lonnet::escape($res->symb);
173: $seq_str .= (' 'x2).
174: qq{<a target="preview" href="$link">view</a>};
175: $seq_str .= "</td></tr>\n";
176: $rb_count++;
177: }
178: }
179: }
180: }
181: if ($seq_str ne '') {
182: $Str .= '<tr><td> </td><td colspan="2"><b>'.$seq->compTitle.'</b></td>'.
183: "</tr>\n".$seq_str;
184: }
185: }
186: $Str .= "</table>\n";
187: return $Str;
188: }
189:
190: ####################################################
191: ####################################################
192:
193: =pod
194:
195: =item &MultipleProblemSelector($navmap,$selected,$inputname)
196:
197: Generate HTML with checkboxes for problem selection.
198:
199: Input:
200:
201: $navmap: a navmap object. If undef, navmaps will be called to create a
202: new object.
203:
204: $selected: Scalar, Array, or hash reference of currently selected items.
205:
206: $inputname: The name of the form elements to use for the checkboxs.
207:
208: Returns: A string containing html for a table which lists the sequences
209: and their contents. A checkbox is provided for each problem.
210:
211: =cut
212:
213: ####################################################
214: ####################################################
215: sub MultipleProblemSelector {
216: my ($navmap,$inputname,$formname)=@_;
217: my $cid = $ENV{'request.course.id'};
218: my $Str;
219: # Massage the input as needed.
220: if (! defined($navmap)) {
221: $navmap = Apache::lonnavmaps::navmap->new();
222: if (! defined($navmap)) {
223: $Str .=
224: '<h1>'.&mt('Error: cannot process course structure').'</h1>';
225: return $Str;
226: }
227: }
228: my $selected = {map { ($_,1) } (&get_selected_symbs($inputname))};
229: # Header
230: $Str .= <<"END";
231: <script language="JavaScript" type="text/javascript">
232: function checkall(value,seqid) {
233: for (i=0; i<document.forms.$formname.elements.length; i++) {
234: ele = document.forms.$formname.elements[i];
235: if (ele.name == '$inputname') {
236: if (seqid != null) {
237: itemid = document.forms.$formname.elements[i].id;
238: thing = itemid.split(':');
239: if (thing[0] == seqid) {
240: document.forms.$formname.elements[i].checked=value;
241: }
242: } else {
243: document.forms.$formname.elements[i].checked=value;
244: }
245: }
246: }
247: }
248: </script>
249: END
250: $Str .=
251: '<a href="javascript:checkall(true)">'.&mt('Select All').'</a>'.
252: (' 'x4).
253: '<a href="javascript:checkall(false)">'.&mt('Unselect All').'</a>';
254: $Str .= $/.'<table>'.$/;
255: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
256: my $sequence_string;
257: my $seq_id = 0;
258: my @Accumulator = (&new_accumulator($ENV{'course.'.$cid.'.description'},
259: '',
260: '',
261: $seq_id++,
262: $inputname));
263: my @Sequence_Data;
264: while (my $curRes = $iterator->next()) {
265: if ($curRes == $iterator->END_MAP) {
266: if (ref($Accumulator[-1]) eq 'CODE') {
267: my $old_accumulator = pop(@Accumulator);
268: push(@Sequence_Data,&{$old_accumulator}());
269: }
270: } elsif ($curRes == $iterator->BEGIN_MAP) {
271: # Not much to do here.
272: }
273: next if (! ref($curRes));
274: if ($curRes->is_map) {
275: push(@Accumulator,&new_accumulator($curRes->compTitle,
276: $curRes->src,
277: $curRes->symb,
278: $seq_id++,
279: $inputname));
280: } elsif ($curRes->is_problem) {
281: if (@Accumulator && $Accumulator[-1] ne '') {
282: &{$Accumulator[-1]}($curRes,
283: exists($selected->{$curRes->symb}));
284: }
285: }
286: }
287: my $course_seq = pop(@Sequence_Data);
288: foreach my $seq ($course_seq,@Sequence_Data) {
289: #my $seq = pop(@Sequence_Data);
290: next if (! defined($seq) || ref($seq) ne 'HASH');
291: $Str.= '<tr><td colspan="2">'.
292: '<b>'.$seq->{'title'}.'</b>'.(' 'x2).
293: '<a href="javascript:checkall(true,'.$seq->{'id'}.')">'.
294: &mt('Select').'</a>'.(' 'x2).
295: '<a href="javascript:checkall(false,'.$seq->{'id'}.')">'.
296: &mt('Unselect').'</a>'.(' 'x2).
297: '</td></tr>'.$/;
298: $Str.= $seq->{'html'};
299: }
300: $Str .= '</table>'.$/;
301: return $Str;
302: }
303:
304: sub new_accumulator {
305: my ($title,$src,$symb,$seq_id,$inputname) = @_;
306: my $target;
307: my $item_id=0;
308: return
309: sub {
310: if (@_) {
311: my ($res,$checked) = @_;
312: $target.='<tr><td><label>'.
313: '<input type="checkbox" name="'.$inputname.'" ';
314: if ($checked) {
315: $target .= 'checked ';
316: }
317: $target .= 'id="'.$seq_id.':'.$item_id++.'" ';
318: $target.=
319: 'value="'.&Apache::lonnet::escape($res->symb).'" />'.
320: ' '.$res->compTitle.'</label>'.
321: (' 'x2).'<a target="preview" '.
322: 'href="'.$res->src.'?symb='.
323: &Apache::lonnet::escape($res->symb).'">view</a>'.
324: '</td></tr>'.$/;
325: } else {
326: if (defined($target)) {
327: return { title => $title,
328: symb => $symb,
329: src => $src,
330: id => $seq_id,
331: html => $target, };
332: }
333: return undef;
334: }
335: };
336: }
337:
338: sub get_selected_symbs {
339: my ($inputfield) = @_;
340: my $field = 'form.'.$inputfield;
341: my @Symbs;
342: if (exists($ENV{$field})) {
343: if (! ref($ENV{$field})) {
344: @Symbs = (&Apache::lonnet::unescape($ENV{$field}));
345: } else {
346: @Symbs = (map {&Apache::lonnet::unescape($_);} @{$ENV{$field}});
347: }
348: }
349: return @Symbs;
350: }
351:
352: ####################################################
353: ####################################################
354:
355: =pod
356:
357: =item &make_target_id($target)
358:
359: Inputs: Hash ref with the following entries:
360: $target->{'symb'}, $target->{'part'}, $target->{'respid'},
361: $target->{'resptype'}.
362:
363: Returns: A string, suitable for a form parameter, which uniquely identifies
364: the problem, part, and response to do statistical analysis on.
365:
366: Used by Apache::lonstathelpers::ProblemSelector().
367:
368: =cut
369:
370: ####################################################
371: ####################################################
372: sub make_target_id {
373: my ($target) = @_;
374: my $id = &Apache::lonnet::escape($target->{'symb'}).':'.
375: &Apache::lonnet::escape($target->{'part'}).':'.
376: &Apache::lonnet::escape($target->{'respid'}).':'.
377: &Apache::lonnet::escape($target->{'resptype'});
378: return $id;
379: }
380:
381: ####################################################
382: ####################################################
383:
384: =pod
385:
386: =item &get_target_from_id($id)
387:
388: Inputs: $id, a scalar string from Apache::lonstathelpers::make_target_id().
389:
390: Returns: A hash reference, $target, containing the following keys:
391: $target->{'symb'}, $target->{'part'}, $target->{'respid'},
392: $target->{'resptype'}.
393:
394: =cut
395:
396: ####################################################
397: ####################################################
398: sub get_target_from_id {
399: my ($id) = @_;
400: if (! ref($id)) {
401: my ($symb,$part,$respid,$resptype) = split(':',$id);
402: return ({ symb => &Apache::lonnet::unescape($symb),
403: part => &Apache::lonnet::unescape($part),
404: respid => &Apache::lonnet::unescape($respid),
405: resptype => &Apache::lonnet::unescape($resptype)});
406: } elsif (ref($id) eq 'ARRAY') {
407: my @Return;
408: foreach my $selected (@$id) {
409: my ($symb,$part,$respid,$resptype) = split(':',$selected);
410: push(@Return,{ symb => &Apache::lonnet::unescape($symb),
411: part => &Apache::lonnet::unescape($part),
412: respid => &Apache::lonnet::unescape($respid),
413: resptype => &Apache::lonnet::unescape($resptype)});
414: }
415: return \@Return;
416: }
417: }
418:
419: ####################################################
420: ####################################################
421:
422: =pod
423:
424: =item &get_prev_curr_next($target,$AcceptableResponseTypes,$granularity)
425:
426: Determine the problem parts or responses preceeding and following the
427: current resource.
428:
429: Inputs: $target (see &Apache::lonstathelpers::get_target_from_id())
430: $AcceptableResponseTypes, regular expression matching acceptable
431: response types,
432: $granularity, either 'part', 'response', or 'part_survey'
433:
434: Returns: three hash references, $prev, $curr, $next, which refer to the
435: preceeding, current, or following problem parts or responses, depending
436: on the value of $granularity. Values of undef indicate there is no
437: previous or next part/response. A value of undef for all three indicates
438: there was no match found to the current part/resource.
439:
440: The hash references contain the following keys:
441: symb, part, resource
442:
443: If $granularity eq 'response', the following ADDITIONAL keys will be present:
444: respid, resptype
445:
446: =cut
447:
448: ####################################################
449: ####################################################
450: sub get_prev_curr_next {
451: my ($target,$AcceptableResponseTypes,$granularity) = @_;
452: #
453: # Build an array with the data we need to search through
454: my @Resource;
455: my ($navmap,@sequences) =
456: &Apache::lonstatistics::selected_sequences_with_assessments('all');
457: return $navmap if (! ref($navmap));
458: foreach my $seq (@sequences) {
459: my @resources = &get_resources($navmap,$seq);
460: foreach my $res (@resources) {
461: foreach my $part (@{$res->parts}) {
462: if ($res->is_survey($part) && ($granularity eq 'part_survey')){
463: push (@Resource,
464: { symb => $res->symb,
465: part => $part,
466: resource => $res,
467: } );
468: } elsif ($granularity eq 'part') {
469: push (@Resource,
470: { symb => $res->symb,
471: part => $part,
472: resource => $res,
473: } );
474: } elsif ($granularity eq 'response') {
475: my @response_ids = $res->responseIds($part);
476: my @response_types = $res->responseType($part);
477: for (my $i=0;
478: $i<scalar(@response_ids);
479: $i++){
480: my $respid = $response_ids[$i];
481: my $resptype = $response_types[$i];
482: next if ($resptype !~ m/$AcceptableResponseTypes/);
483: push (@Resource,
484: { symb => $res->symb,
485: part => $part,
486: respid => $respid,
487: resptype => $resptype,
488: resource => $res,
489: } );
490: }
491: }
492: }
493: }
494: }
495: #
496: # Get the index of the current situation
497: my $curr_idx;
498: for ($curr_idx=0;$curr_idx<$#Resource;$curr_idx++) {
499: my $curr_item = $Resource[$curr_idx];
500: if ($granularity eq 'part' || $granularity eq 'part_survey') {
501: if ($curr_item->{'symb'} eq $target->{'symb'} &&
502: $curr_item->{'part'} eq $target->{'part'}) {
503: last;
504: }
505: } elsif ($granularity eq 'response') {
506: if ($curr_item->{'symb'} eq $target->{'symb'} &&
507: $curr_item->{'part'} eq $target->{'part'} &&
508: $curr_item->{'respid'} eq $target->{'respid'} &&
509: $curr_item->{'resptype'} eq $target->{'resptype'}) {
510: last;
511: }
512: }
513: }
514: my $curr_item = $Resource[$curr_idx];
515: if ($granularity eq 'part' || $granularity eq 'part_survey') {
516: if ($curr_item->{'symb'} ne $target->{'symb'} ||
517: $curr_item->{'part'} ne $target->{'part'}) {
518: # bogus symb - return nothing
519: return (undef,undef,undef);
520: }
521: } elsif ($granularity eq 'response') {
522: if ($curr_item->{'symb'} ne $target->{'symb'} ||
523: $curr_item->{'part'} ne $target->{'part'} ||
524: $curr_item->{'respid'} ne $target->{'respid'} ||
525: $curr_item->{'resptype'} ne $target->{'resptype'}){
526: # bogus symb - return nothing
527: return (undef,undef,undef);
528: }
529: }
530: #
531: # Now just pick up the data we need
532: my ($prev,$curr,$next);
533: if ($curr_idx == 0) {
534: $prev = undef;
535: $curr = $Resource[$curr_idx ];
536: $next = $Resource[$curr_idx+1];
537: } elsif ($curr_idx == $#Resource) {
538: $prev = $Resource[$curr_idx-1];
539: $curr = $Resource[$curr_idx ];
540: $next = undef;
541: } else {
542: $prev = $Resource[$curr_idx-1];
543: $curr = $Resource[$curr_idx ];
544: $next = $Resource[$curr_idx+1];
545: }
546: return ($navmap,$prev,$curr,$next);
547: }
548:
549:
550: #####################################################
551: #####################################################
552:
553: =pod
554:
555: =item GetStudentAnswers($r,$problem,$Students)
556:
557: Determines the correct answer for a set of students on a given problem.
558: The students answers are stored in the student hashes pointed to by the
559: array @$Students under the key 'answer'.
560:
561: Inputs: $r
562: $problem: hash reference containing the keys 'resource', 'part', and 'respid'.
563: $Students: reference to array containing student hashes (need 'username',
564: 'domain').
565:
566: Returns: nothing
567:
568: =cut
569:
570: #####################################################
571: #####################################################
572: sub GetStudentAnswers {
573: my ($r,$problem,$Students,$formname,$inputname) = @_;
574: my %answers;
575: my $status_type;
576: if (defined($formname)) {
577: $status_type = 'inline';
578: } else {
579: $status_type = 'popup';
580: }
581: my $c = $r->connection();
582: my %Answers;
583: my ($resource,$partid,$respid) = ($problem->{'resource'},
584: $problem->{'part'},
585: $problem->{'respid'});
586: # Read in the cache (if it exists) before we start timing things.
587: &Apache::lonstathelpers::ensure_proper_cache($resource->{'symb'});
588: # Open progress window
589: my %prog_state=&Apache::lonhtmlcommon::Create_PrgWin
590: ($r,'Student Answer Compilation Status',
591: 'Student Answer Compilation Progress', scalar(@$Students),
592: $status_type,undef,$formname,$inputname);
593: $r->rflush();
594: foreach my $student (@$Students) {
595: last if ($c->aborted());
596: my $sname = $student->{'username'};
597: my $sdom = $student->{'domain'};
598: my $answer = &Apache::lonstathelpers::get_student_answer
599: ($resource,$sname,$sdom,$partid,$respid);
600: &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state,
601: &mt('last student'));
602: $answers{$answer}++;
603: $student->{'answer'} = $answer;
604: }
605: &Apache::lonstathelpers::write_analysis_cache();
606: return if ($c->aborted());
607: $r->rflush();
608: # close progress window
609: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
610: return \%answers;
611: }
612:
613: #####################################################
614: #####################################################
615:
616: =pod
617:
618: =item analyze_problem_as_student
619:
620: Analyzes a homework problem for a student
621:
622: Inputs: $resource: a resource object
623: $sname, $sdom, $partid, $respid
624:
625: Returns: the problem analysis hash
626:
627: =cut
628:
629: #####################################################
630: #####################################################
631: sub analyze_problem_as_student {
632: my ($resource,$sname,$sdom) = @_;
633: if (ref($resource) ne 'HASH') {
634: my $res = $resource;
635: $resource = { 'src' => $res->src,
636: 'symb' => $res->symb,
637: 'parts' => $res->parts };
638: foreach my $part (@{$resource->{'parts'}}) {
639: $resource->{'partdata'}->{$part}->{'ResponseIds'}=
640: [$res->responseIds($part)];
641: }
642: }
643: my $url = $resource->{'src'};
644: my $symb = $resource->{'symb'};
645: my $analysis = &get_from_analysis_cache($sname,$sdom,$symb);
646: if (! defined($analysis)) {
647: my $courseid = $ENV{'request.course.id'};
648: my $Answ=&Apache::lonnet::ssi($url,('grade_target' => 'analyze',
649: 'grade_domain' => $sdom,
650: 'grade_username' => $sname,
651: 'grade_symb' => $symb,
652: 'grade_courseid' => $courseid));
653: (my $garbage,$analysis)=split(/_HASH_REF__/,$Answ,2);
654: &store_analysis($sname,$sdom,$symb,$analysis);
655: }
656: my %Answer=&Apache::lonnet::str2hash($analysis);
657: #
658: return \%Answer;
659: }
660:
661: #####################################################
662: #####################################################
663:
664: =pod
665:
666: =item get_student_answer
667:
668: Analyzes a homework problem for a particular student and returns the correct
669: answer. Attempts to put together an answer for problem types
670: that do not natively support it.
671:
672: Inputs: $resource: a resource object (from navmaps or hash from loncoursedata)
673: $sname, $sdom, $partid, $respid
674:
675: Returns: $answer
676:
677: If $partid and $respid are specified, $answer is simply a scalar containing
678: the correct answer for the response.
679:
680: If $partid or $respid are undefined, $answer will be a hash reference with
681: keys $partid.'.'.$respid.'.answer'.
682:
683: =cut
684:
685: #####################################################
686: #####################################################
687: sub get_student_answer {
688: my ($resource,$sname,$sdom,$partid,$respid) = @_;
689: #
690: if (ref($resource) ne 'HASH') {
691: my $res = $resource;
692: $resource = { 'src' => $res->src,
693: 'symb' => $res->symb,
694: 'parts' => $res->parts };
695: foreach my $part (@{$resource->{'parts'}}) {
696: $resource->{'partdata'}->{$part}->{'ResponseIds'}=
697: [$res->responseIds($part)];
698: }
699: }
700: #
701: my $analysis =
702: &analyze_problem_as_student($resource,$sname,$sdom);
703: my $answer;
704: foreach my $partid (@{$resource->{'parts'}}) {
705: my $partdata = $resource->{'partdata'}->{$partid};
706: foreach my $respid (@{$partdata->{'ResponseIds'}}) {
707: my $prefix = $partid.'.'.$respid;
708: my $key = $prefix.'.answer';
709: $answer->{$partid}->{$respid} =
710: &get_answer($prefix,$key,%$analysis);
711: }
712: }
713: my $returnvalue;
714: if (! defined($partid)) {
715: $returnvalue = $answer;
716: } elsif (! defined($respid)) {
717: $returnvalue = $answer->{$partid};
718: } else {
719: $returnvalue = $answer->{$partid}->{$respid};
720: }
721: return $returnvalue;
722: }
723:
724: sub get_answer {
725: my ($prefix,$key,%Answer) = @_;
726: my $returnvalue;
727: if (exists($Answer{$key})) {
728: my $student_answer = $Answer{$key}->[0];
729: if (! defined($student_answer)) {
730: $student_answer = $Answer{$key}->[1];
731: }
732: $returnvalue = $student_answer;
733: } else {
734: if (exists($Answer{$prefix.'.shown'})) {
735: # The response has foils
736: my %values;
737: while (my ($k,$v) = each(%Answer)) {
738: next if ($k !~ /^$prefix\.foil\.(value|area)\.(.*)$/);
739: my $foilname = $2;
740: $values{$foilname}=$v;
741: }
742: foreach my $foil (@{$Answer{$prefix.'.shown'}}) {
743: if (ref($values{$foil}) eq 'ARRAY') {
744: $returnvalue.=&HTML::Entities::encode($foil,'<>&"').'='.
745: join(',',map {&HTML::Entities::encode($_,'<>&"')} @{$values{$foil}}).'&';
746: } else {
747: $returnvalue.=&HTML::Entities::encode($foil,'<>&"').'='.
748: &HTML::Entities::encode($values{$foil},'<>&"').'&';
749: }
750: }
751: $returnvalue =~ s/ /\%20/g;
752: chop ($returnvalue);
753: }
754: }
755: return $returnvalue;
756: }
757:
758: #####################################################
759: #####################################################
760:
761: =pod
762:
763: =item Caching routines
764:
765: =over 4
766:
767: =item &load_analysis_cache($symb)
768:
769: Loads the cache for the given symb into memory from disk.
770: Requires the cache filename be set.
771: Only should be called by &ensure_proper_cache.
772:
773: =cut
774:
775: #####################################################
776: #####################################################
777: {
778: my $cache_filename = undef;
779: my $current_symb = undef;
780: my %cache;
781:
782: sub load_analysis_cache {
783: my ($symb) = @_;
784: return if (! defined($cache_filename));
785: if (! defined($current_symb) || $current_symb ne $symb) {
786: undef(%cache);
787: my $storedstring;
788: my %cache_db;
789: if (tie(%cache_db,'GDBM_File',$cache_filename,&GDBM_READER(),0640)) {
790: $storedstring = $cache_db{&Apache::lonnet::escape($symb)};
791: untie(%cache_db);
792: }
793: if (defined($storedstring)) {
794: %cache = %{thaw($storedstring)};
795: }
796: }
797: return;
798: }
799:
800: #####################################################
801: #####################################################
802:
803: =pod
804:
805: =item &get_from_analysis_cache($sname,$sdom,$symb,$partid,$respid)
806:
807: Returns the appropriate data from the cache, or undef if no data exists.
808:
809: =cut
810:
811: #####################################################
812: #####################################################
813: sub get_from_analysis_cache {
814: my ($sname,$sdom,$symb) = @_;
815: &ensure_proper_cache($symb);
816: my $returnvalue;
817: if (exists($cache{$sname.':'.$sdom})) {
818: $returnvalue = $cache{$sname.':'.$sdom};
819: } else {
820: $returnvalue = undef;
821: }
822: return $returnvalue;
823: }
824:
825: #####################################################
826: #####################################################
827:
828: =pod
829:
830: =item &write_analysis_cache($symb)
831:
832: Writes the in memory cache to disk so that it can be read in with
833: &load_analysis_cache($symb).
834:
835: =cut
836:
837: #####################################################
838: #####################################################
839: sub write_analysis_cache {
840: return if (! defined($current_symb) || ! defined($cache_filename));
841: my %cache_db;
842: my $key = &Apache::lonnet::escape($current_symb);
843: if (tie(%cache_db,'GDBM_File',$cache_filename,&GDBM_WRCREAT(),0640)) {
844: my $storestring = freeze(\%cache);
845: $cache_db{$key}=$storestring;
846: $cache_db{$key.'.time'}=time;
847: untie(%cache_db);
848: }
849: undef(%cache);
850: undef($current_symb);
851: undef($cache_filename);
852: return;
853: }
854:
855: #####################################################
856: #####################################################
857:
858: =pod
859:
860: =item &ensure_proper_cache($symb)
861:
862: Called to make sure we have the proper cache set up. This is called
863: prior to every analysis lookup.
864:
865: =cut
866:
867: #####################################################
868: #####################################################
869: sub ensure_proper_cache {
870: my ($symb) = @_;
871: my $cid = $ENV{'request.course.id'};
872: my $new_filename = '/home/httpd/perl/tmp/'.
873: 'problemanalysis_'.$cid.'_analysis_cache.db';
874: if (! defined($cache_filename) ||
875: $cache_filename ne $new_filename ||
876: ! defined($current_symb) ||
877: $current_symb ne $symb) {
878: $cache_filename = $new_filename;
879: # Notice: $current_symb is not set to $symb until after the cache is
880: # loaded. This is what tells &load_analysis_cache to load in a new
881: # symb cache.
882: &load_analysis_cache($symb);
883: $current_symb = $symb;
884: }
885: }
886:
887: #####################################################
888: #####################################################
889:
890: =pod
891:
892: =item &store_analysis($sname,$sdom,$symb,$partid,$respid,$dataset)
893:
894: Stores the analysis data in the in memory cache.
895:
896: =cut
897:
898: #####################################################
899: #####################################################
900: sub store_analysis {
901: my ($sname,$sdom,$symb,$dataset) = @_;
902: return if ($symb ne $current_symb);
903: $cache{$sname.':'.$sdom}=$dataset;
904: return;
905: }
906:
907: }
908: #####################################################
909: #####################################################
910:
911: =pod
912:
913: =back
914:
915: =cut
916:
917: #####################################################
918: #####################################################
919:
920: ##
921: ## The following is copied from datecalc1.pl, part of the
922: ## Spreadsheet::WriteExcel CPAN module.
923: ##
924: ##
925: ######################################################################
926: #
927: # Demonstration of writing date/time cells to Excel spreadsheets,
928: # using UNIX/Perl time as source of date/time.
929: #
930: # Copyright 2000, Andrew Benham, adsb@bigfoot.com
931: #
932: ######################################################################
933: #
934: # UNIX/Perl time is the time since the Epoch (00:00:00 GMT, 1 Jan 1970)
935: # measured in seconds.
936: #
937: # An Excel file can use exactly one of two different date/time systems.
938: # In these systems, a floating point number represents the number of days
939: # (and fractional parts of the day) since a start point. The floating point
940: # number is referred to as a 'serial'.
941: # The two systems ('1900' and '1904') use different starting points:
942: # '1900'; '1.00' is 1 Jan 1900 BUT 1900 is erroneously regarded as
943: # a leap year - see:
944: # http://support.microsoft.com/support/kb/articles/Q181/3/70.asp
945: # for the excuse^H^H^H^H^H^Hreason.
946: # '1904'; '1.00' is 2 Jan 1904.
947: #
948: # The '1904' system is the default for Apple Macs. Windows versions of
949: # Excel have the option to use the '1904' system.
950: #
951: # Note that Visual Basic's "DateSerial" function does NOT erroneously
952: # regard 1900 as a leap year, and thus its serials do not agree with
953: # the 1900 serials of Excel for dates before 1 Mar 1900.
954: #
955: # Note that StarOffice (at least at version 5.2) does NOT erroneously
956: # regard 1900 as a leap year, and thus its serials do not agree with
957: # the 1900 serials of Excel for dates before 1 Mar 1900.
958: #
959: ######################################################################
960: #
961: # Calculation description
962: # =======================
963: #
964: # 1900 system
965: # -----------
966: # Unix time is '0' at 00:00:00 GMT 1 Jan 1970, i.e. 70 years after 1 Jan 1900.
967: # Of those 70 years, 17 (1904,08,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68)
968: # were leap years with an extra day.
969: # Thus there were 17 + 70*365 days = 25567 days between 1 Jan 1900 and
970: # 1 Jan 1970.
971: # In the 1900 system, '1' is 1 Jan 1900, but as 1900 was not a leap year
972: # 1 Jan 1900 should really be '2', so 1 Jan 1970 is '25569'.
973: #
974: # 1904 system
975: # -----------
976: # Unix time is '0' at 00:00:00 GMT 1 Jan 1970, i.e. 66 years after 1 Jan 1904.
977: # Of those 66 years, 17 (1904,08,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68)
978: # were leap years with an extra day.
979: # Thus there were 17 + 66*365 days = 24107 days between 1 Jan 1904 and
980: # 1 Jan 1970.
981: # In the 1904 system, 2 Jan 1904 being '1', 1 Jan 1970 is '24107'.
982: #
983: ######################################################################
984: #
985: # Copyright (c) 2000, Andrew Benham.
986: # This program is free software. It may be used, redistributed and/or
987: # modified under the same terms as Perl itself.
988: #
989: # Andrew Benham, adsb@bigfoot.com
990: # London, United Kingdom
991: # 11 Nov 2000
992: #
993: ######################################################################
994: #-----------------------------------------------------------
995: # calc_serial()
996: #
997: # Called with (up to) 2 parameters.
998: # 1. Unix timestamp. If omitted, uses current time.
999: # 2. GMT flag. Set to '1' to return serial in GMT.
1000: # If omitted, returns serial in appropriate timezone.
1001: #
1002: # Returns date/time serial according to $DATE_SYSTEM selected
1003: #-----------------------------------------------------------
1004: sub calc_serial {
1005: # Use 1900 date system on all platforms other than Apple Mac (for which
1006: # use 1904 date system).
1007: my $DATE_SYSTEM = ($^O eq 'MacOS') ? 1 : 0;
1008: my $time = (defined $_[0]) ? $_[0] : time();
1009: my $gmtflag = (defined $_[1]) ? $_[1] : 0;
1010: #
1011: # Divide timestamp by number of seconds in a day.
1012: # This gives a date serial with '0' on 1 Jan 1970.
1013: my $serial = $time / 86400;
1014: #
1015: # Adjust the date serial by the offset appropriate to the
1016: # currently selected system (1900/1904).
1017: if ($DATE_SYSTEM == 0) { # use 1900 system
1018: $serial += 25569;
1019: } else { # use 1904 system
1020: $serial += 24107;
1021: }
1022: #
1023: unless ($gmtflag) {
1024: # Now have a 'raw' serial with the right offset. But this
1025: # gives a serial in GMT, which is false unless the timezone
1026: # is GMT. We need to adjust the serial by the appropriate
1027: # timezone offset.
1028: # Calculate the appropriate timezone offset by seeing what
1029: # the differences between localtime and gmtime for the given
1030: # time are.
1031: #
1032: my @gmtime = gmtime($time);
1033: my @ltime = localtime($time);
1034: #
1035: # For the first 7 elements of the two arrays, adjust the
1036: # date serial where the elements differ.
1037: for (0 .. 6) {
1038: my $diff = $ltime[$_] - $gmtime[$_];
1039: if ($diff) {
1040: $serial += _adjustment($diff,$_);
1041: }
1042: }
1043: }
1044: #
1045: # Perpetuate the error that 1900 was a leap year by decrementing
1046: # the serial if we're using the 1900 system and the date is prior to
1047: # 1 Mar 1900. This has the effect of making serial value '60'
1048: # 29 Feb 1900.
1049: #
1050: # This fix only has any effect if UNIX/Perl time on the platform
1051: # can represent 1900. Many can't.
1052: #
1053: unless ($DATE_SYSTEM) {
1054: $serial-- if ($serial < 61); # '61' is 1 Mar 1900
1055: }
1056: return $serial;
1057: }
1058:
1059: sub _adjustment {
1060: # Based on the difference in the localtime/gmtime array elements
1061: # number, return the adjustment required to the serial.
1062: #
1063: # We only look at some elements of the localtime/gmtime arrays:
1064: # seconds unlikely to be different as all known timezones
1065: # have an offset of integral multiples of 15 minutes,
1066: # but it's easy to do.
1067: # minutes will be different for timezone offsets which are
1068: # not an exact number of hours.
1069: # hours very likely to be different.
1070: # weekday will differ when localtime/gmtime difference
1071: # straddles midnight.
1072: #
1073: # Assume that difference between localtime and gmtime is less than
1074: # 5 days, then don't have to do maths for day of month, month number,
1075: # year number, etc...
1076: #
1077: my ($delta,$element) = @_;
1078: my $adjust = 0;
1079: #
1080: if ($element == 0) { # Seconds
1081: $adjust = $delta/86400; # 60 * 60 * 24
1082: } elsif ($element == 1) { # Minutes
1083: $adjust = $delta/1440; # 60 * 24
1084: } elsif ($element == 2) { # Hours
1085: $adjust = $delta/24; # 24
1086: } elsif ($element == 6) { # Day of week number
1087: # Catch difference straddling Sat/Sun in either direction
1088: $delta += 7 if ($delta < -4);
1089: $delta -= 7 if ($delta > 4);
1090: #
1091: $adjust = $delta;
1092: }
1093: return $adjust;
1094: }
1095:
1096: ###########################################################
1097: ###########################################################
1098:
1099: =pod
1100:
1101: =item get_problem_data
1102:
1103: Returns a data structure describing the problem.
1104:
1105: Inputs: $url
1106:
1107: Returns: %Partdata
1108:
1109: =cut
1110:
1111: ## note: we must force each foil and option to not begin or end with
1112: ## spaces as they are stored without such data.
1113: ##
1114: ###########################################################
1115: ###########################################################
1116: sub get_problem_data {
1117: my ($url) = @_;
1118: my $Answ=&Apache::lonnet::ssi($url,('grade_target' => 'analyze'));
1119: (my $garbage,$Answ)=split(/_HASH_REF__/,$Answ,2);
1120: my %Answer;
1121: %Answer=&Apache::lonnet::str2hash($Answ);
1122: my %Partdata;
1123: foreach my $part (@{$Answer{'parts'}}) {
1124: while (my($key,$value) = each(%Answer)) {
1125: #
1126: # Logging code:
1127: if (0) {
1128: &Apache::lonnet::logthis($part.' got key "'.$key.'"');
1129: if (ref($value) eq 'ARRAY') {
1130: &Apache::lonnet::logthis(' @'.join(',',@$value));
1131: } else {
1132: &Apache::lonnet::logthis(' '.$value);
1133: }
1134: }
1135: # End of logging code
1136: next if ($key !~ /^$part/);
1137: $key =~ s/^$part\.//;
1138: if (ref($value) eq 'ARRAY') {
1139: if ($key eq 'options') {
1140: $Partdata{$part}->{'_Options'}=$value;
1141: } elsif ($key eq 'concepts') {
1142: $Partdata{$part}->{'_Concepts'}=$value;
1143: } elsif ($key eq 'items') {
1144: $Partdata{$part}->{'_Items'}=$value;
1145: } elsif ($key =~ /^concept\.(.*)$/) {
1146: my $concept = $1;
1147: foreach my $foil (@$value) {
1148: $Partdata{$part}->{'_Foils'}->{$foil}->{'_Concept'}=
1149: $concept;
1150: }
1151: } elsif ($key =~ /^(unit|incorrect|answer|ans_low|ans_high|str_type)$/) {
1152: $Partdata{$part}->{$key}=$value;
1153: }
1154: } else {
1155: if ($key=~ /^foil\.text\.(.*)$/) {
1156: my $foil = $1;
1157: $Partdata{$part}->{'_Foils'}->{$foil}->{'name'}=$foil;
1158: $value =~ s/(\s*$|^\s*)//g;
1159: $Partdata{$part}->{'_Foils'}->{$foil}->{'text'}=$value;
1160: } elsif ($key =~ /^foil\.value\.(.*)$/) {
1161: my $foil = $1;
1162: $Partdata{$part}->{'_Foils'}->{$foil}->{'value'}=$value;
1163: } elsif ($key eq 'answercomputed') {
1164: $Partdata{$part}->{'answercomputed'} = $value;
1165: }
1166: }
1167: }
1168: }
1169: # Further debugging code
1170: if (0) {
1171: &Apache::lonnet::logthis('lonstathelpers::get_problem_data');
1172: &log_hash_ref(\%Partdata);
1173: }
1174: return %Partdata;
1175: }
1176:
1177: sub log_array_ref {
1178: my ($arrayref,$prefix) = @_;
1179: return if (ref($arrayref) ne 'ARRAY');
1180: if (! defined($prefix)) { $prefix = ''; };
1181: foreach my $v (@$arrayref) {
1182: if (ref($v) eq 'ARRAY') {
1183: &log_array_ref($v,$prefix.' ');
1184: } elsif (ref($v) eq 'HASH') {
1185: &log_hash_ref($v,$prefix.' ');
1186: } else {
1187: &Apache::lonnet::logthis($prefix.'"'.$v.'"');
1188: }
1189: }
1190: }
1191:
1192: sub log_hash_ref {
1193: my ($hashref,$prefix) = @_;
1194: return if (ref($hashref) ne 'HASH');
1195: if (! defined($prefix)) { $prefix = ''; };
1196: while (my ($k,$v) = each(%$hashref)) {
1197: if (ref($v) eq 'ARRAY') {
1198: &Apache::lonnet::logthis($prefix.'"'.$k.'" = array');
1199: &log_array_ref($v,$prefix.' ');
1200: } elsif (ref($v) eq 'HASH') {
1201: &Apache::lonnet::logthis($prefix.'"'.$k.'" = hash');
1202: &log_hash_ref($v,$prefix.' ');
1203: } else {
1204: &Apache::lonnet::logthis($prefix.'"'.$k.'" => "'.$v.'"');
1205: }
1206: }
1207: }
1208: ####################################################
1209: ####################################################
1210:
1211: =pod
1212:
1213: =item &limit_by_time()
1214:
1215: =cut
1216:
1217: ####################################################
1218: ####################################################
1219: sub limit_by_time_form {
1220: my $Starttime_form = '';
1221: my $starttime = &Apache::lonhtmlcommon::get_date_from_form
1222: ('limitby_startdate');
1223: my $endtime = &Apache::lonhtmlcommon::get_date_from_form
1224: ('limitby_enddate');
1225: if (! defined($endtime)) {
1226: $endtime = time;
1227: }
1228: if (! defined($starttime)) {
1229: $starttime = $endtime - 60*60*24*7;
1230: }
1231: my $state;
1232: if (&limit_by_time()) {
1233: $state = '';
1234: } else {
1235: $state = 'disabled';
1236: }
1237: my $startdateform = &Apache::lonhtmlcommon::date_setter
1238: ('Statistics','limitby_startdate',$starttime,undef,undef,$state);
1239: my $enddateform = &Apache::lonhtmlcommon::date_setter
1240: ('Statistics','limitby_enddate',$endtime,undef,undef,$state);
1241: my $Str;
1242: $Str .= '<script language="Javascript" >';
1243: $Str .= 'function toggle_limitby_activity(state) {';
1244: $Str .= ' if (state) {';
1245: $Str .= ' limitby_startdate_enable();';
1246: $Str .= ' limitby_enddate_enable();';
1247: $Str .= ' } else {';
1248: $Str .= ' limitby_startdate_disable();';
1249: $Str .= ' limitby_enddate_disable();';
1250: $Str .= ' }';
1251: $Str .= '}';
1252: $Str .= '</script>';
1253: $Str .= '<fieldset>';
1254: my $timecheckbox = '<input type="checkbox" name="limit_by_time" ';
1255: if (&limit_by_time()) {
1256: $timecheckbox .= ' checked ';
1257: }
1258: $timecheckbox .= 'OnChange="javascript:toggle_limitby_activity(this.checked);" ';
1259: $timecheckbox .= ' />';
1260: $Str .= '<legend>'.&mt('[_1] Limit by time',$timecheckbox).'</legend>';
1261: $Str .= &mt('Start Time: [_1]',$startdateform).'<br />';
1262: $Str .= &mt(' End Time: [_1]',$enddateform).'<br />';
1263: $Str .= '</fieldset>';
1264: return $Str;
1265: }
1266:
1267: sub limit_by_time {
1268: if (exists($ENV{'form.limit_by_time'}) &&
1269: $ENV{'form.limit_by_time'} ne '' ) {
1270: return 1;
1271: } else {
1272: return 0;
1273: }
1274: }
1275:
1276: sub get_time_limits {
1277: my $starttime = &Apache::lonhtmlcommon::get_date_from_form
1278: ('limitby_startdate');
1279: my $endtime = &Apache::lonhtmlcommon::get_date_from_form
1280: ('limitby_enddate');
1281: return ($starttime,$endtime);
1282: }
1283:
1284:
1285:
1286: ####################################################
1287: ####################################################
1288:
1289: =pod
1290:
1291: =item sections_description
1292:
1293: Inputs: @Sections, an array of sections
1294:
1295: Returns: A text description of the sections selected.
1296:
1297: =cut
1298:
1299: ####################################################
1300: ####################################################
1301: sub sections_description {
1302: my @Sections = @_;
1303: my $sectionstring = '';
1304: if (scalar(@Sections) > 1) {
1305: if (scalar(@Sections) > 2) {
1306: my $last = pop(@Sections);
1307: $sectionstring = "Sections ".join(', ',@Sections).', and '.$last;
1308: } else {
1309: $sectionstring = "Sections ".join(' and ',@Sections);
1310: }
1311: } else {
1312: if ($Sections[0] eq 'all') {
1313: $sectionstring = "All sections";
1314: } else {
1315: $sectionstring = "Section ".$Sections[0];
1316: }
1317: }
1318: return $sectionstring;
1319: }
1320:
1321: ####################################################
1322: ####################################################
1323:
1324: =pod
1325:
1326: =item &manage_caches
1327:
1328: Inputs: $r, apache request object
1329:
1330: Returns: An array of scalars containing html for buttons.
1331:
1332: =cut
1333:
1334: ####################################################
1335: ####################################################
1336: sub manage_caches {
1337: my ($r,$formname,$inputname,$update_message) = @_;
1338: &Apache::loncoursedata::clear_internal_caches();
1339: my $sectionkey =
1340: join(',',
1341: map {
1342: &Apache::lonnet::escape($_);
1343: } sort(@Apache::lonstatistics::SelectedSections)
1344: );
1345: my $statuskey = $Apache::lonstatistics::enrollment_status;
1346: if (exists($ENV{'form.ClearCache'}) ||
1347: exists($ENV{'form.updatecaches'}) ||
1348: (exists($ENV{'form.firstrun'}) && $ENV{'form.firstrun'} ne 'no') ||
1349: (exists($ENV{'form.prevsection'}) &&
1350: $ENV{'form.prevsection'} ne $sectionkey) ||
1351: (exists($ENV{'form.prevenrollstatus'}) &&
1352: $ENV{'form.prevenrollstatus'} ne $statuskey)
1353: ) {
1354: if (defined($update_message)) {
1355: $r->print($update_message);
1356: }
1357: if (0) {
1358: &Apache::lonnet::logthis('Updating mysql student data caches');
1359: }
1360: &gather_full_student_data($r,$formname,$inputname);
1361: }
1362: #
1363: my @Buttons =
1364: ('<input type="submit" name="ClearCache" '.
1365: 'value="'.&mt('Clear Caches').'" />',
1366: '<input type="submit" name="updatecaches" '.
1367: 'value="'.&mt('Update Caches').'" />'.
1368: &Apache::loncommon::help_open_topic('Statistics_Cache'),
1369: '<input type="hidden" name="prevsection" value="'.$sectionkey.'" />',
1370: '<input type="hidden" name="prevenrollstatus" value="'.$statuskey.'" />'
1371: );
1372: #
1373: if (! exists($ENV{'form.firstrun'})) {
1374: $r->print('<input type="hidden" name="firstrun" value="yes" />');
1375: } else {
1376: $r->print('<input type="hidden" name="firstrun" value="no" />');
1377: }
1378: #
1379: return @Buttons;
1380: }
1381:
1382: sub gather_full_student_data {
1383: my ($r,$formname,$inputname) = @_;
1384: my $status_type;
1385: if (defined($formname)) {
1386: $status_type = 'inline';
1387: } else {
1388: $status_type = 'popup';
1389: }
1390: my $c = $r->connection();
1391: #
1392: &Apache::loncoursedata::clear_internal_caches();
1393: #
1394: my @Students = @Apache::lonstatistics::Students;
1395: #
1396: # Open the progress window
1397: my %prog_state=&Apache::lonhtmlcommon::Create_PrgWin
1398: ($r,&mt('Student Data Compilation Status'),
1399: &mt('Student Data Compilation Progress'), scalar(@Students),
1400: $status_type,undef,$formname,$inputname);
1401: #
1402: while (my $student = shift @Students) {
1403: return if ($c->aborted());
1404: my $status = &Apache::loncoursedata::ensure_current_full_data
1405: ($student->{'username'},$student->{'domain'},
1406: $ENV{'request.course.id'});
1407: &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state,
1408: &mt('last student'));
1409: }
1410: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
1411: $r->rflush();
1412: return;
1413: }
1414:
1415: ####################################################
1416: ####################################################
1417:
1418: =pod
1419:
1420: =item &submission_report_form
1421:
1422: Input: The originating reportSelected value for the current stats page.
1423:
1424: Output: Scalar containing HTML with needed form elements and a link to
1425: the student submission reports page.
1426:
1427: =cut
1428:
1429: ####################################################
1430: ####################################################
1431: sub submission_report_form {
1432: my ($original_report) = @_;
1433: # Note: In the link below we change the reportSelected value. If
1434: # the user hits the 'back' button on the browser after getting their
1435: # student submissions report, this value may still be around. So we
1436: # output a script block to set it properly. If the $original_report
1437: # value is unset, you are just asking for trouble.
1438: if (! defined($original_report)) {
1439: &Apache::lonnet::logthis
1440: ('someone called lonstathelpers::submission_report_form without '.
1441: ' enough input.');
1442: }
1443: my $html = $/.
1444: '<script type="Text/JavaScript">'.
1445: "document.Statistics.reportSelected.value='$original_report';".
1446: '</script>'.
1447: '<input type="hidden" name="correctans" value="true" />'.
1448: '<input type="hidden" name="prob_status" value="true" />'.
1449: '<input type="hidden" name="all_sub" value="true" />';
1450: my $output_selector = $/.'<select name="output">'.$/;
1451: foreach ('HTML','Excel','CSV') {
1452: $output_selector .= ' <option value="'.lc($_).'"';
1453: if ($ENV{'form.output'} eq lc($_)) {
1454: $output_selector .= ' selected ';
1455: }
1456: $output_selector .='>'.&mt($_).'</option>'.$/;
1457: }
1458: $output_selector .= '</select>'.$/;
1459: my $link = '<a href="javascript:'.
1460: q{document.Statistics.reportSelected.value='student_submission_reports';}.
1461: 'document.Statistics.submit();">';
1462: $html.= &mt('View data as [_1] [_2]go[_3]',$output_selector,
1463: $link,'</a>').$/;
1464: return $html
1465: }
1466:
1467: ####################################################
1468: ####################################################
1469:
1470: =pod
1471:
1472: =back
1473:
1474: =cut
1475:
1476: ####################################################
1477: ####################################################
1478:
1479: 1;
1480:
1481: __END__
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