1: # The LearningOnline Network with CAPA
2: #
3: # $Id: lonstathelpers.pm,v 1.42 2005/03/03 17:55:06 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 $base;
85: ($base,undef) = ($resource->{'src'} =~ m|(.*/)[^/]*$|);
86: $base = "http://".$ENV{'SERVER_NAME'}.$base;
87: my ($src,$symb)=($resource->src,&Apache::lonnet::escape($resource->symb));
88: my $rendered_problem = &Apache::lonnet::ssi_body($src.'?symb='.$symb);
89: $rendered_problem =~ s/<\s*form\s*/<nop /g;
90: $rendered_problem =~ s|(<\s*/form\s*>)|<\/nop>|g;
91: return '<table bgcolor="ffffff"><tr><td>'.
92: '<base href="'.$base.'" />'.
93: $rendered_problem.
94: '</td></tr></table>';
95: }
96:
97: ####################################################
98: ####################################################
99:
100: =pod
101:
102: =item &get_resources
103:
104: =cut
105:
106: ####################################################
107: ####################################################
108: sub get_resources {
109: my ($navmap,$sequence) = @_;
110: my @resources = $navmap->retrieveResources($sequence,
111: sub { shift->is_problem(); },
112: 0,0,0);
113: return @resources;
114: }
115:
116: ####################################################
117: ####################################################
118:
119: =pod
120:
121: =item &problem_selector($AcceptedResponseTypes)
122:
123: Input: scalar containing regular expression which matches response
124: types to show. '.' will yield all, '(option|radiobutton)' will match
125: all option response and radiobutton problems.
126:
127: Returns: A string containing html for a table which lists the sequences
128: and their contents. A radiobutton is provided for each problem.
129: Skips 'survey' problems.
130:
131: =cut
132:
133: ####################################################
134: ####################################################
135: sub problem_selector {
136: my ($AcceptedResponseTypes) = @_;
137: my $Str;
138: $Str = "\n<table>\n";
139: my $rb_count =0;
140: my ($navmap,@sequences) =
141: &Apache::lonstatistics::selected_sequences_with_assessments('all');
142: return $navmap if (! ref($navmap)); # error
143: foreach my $seq (@sequences) {
144: my $seq_str = '';
145: foreach my $res (&get_resources($navmap,$seq)) {
146: foreach my $part (@{$res->parts}) {
147: my @response_ids = $res->responseIds($part);
148: my @response_types = $res->responseType($part);
149: for (my $i=0;$i<scalar(@response_types);$i++){
150: my $respid = $response_ids[$i];
151: my $resptype = $response_types[$i];
152: if ($resptype =~ m/$AcceptedResponseTypes/) {
153: my $value = &make_target_id({symb=>$res->symb,
154: part=>$part,
155: respid=>$respid,
156: resptype=>$resptype});
157: my $checked = '';
158: if ($ENV{'form.problemchoice'} eq $value) {
159: $checked = 'checked ';
160: }
161: my $title = $res->compTitle;
162: if (! defined($title) || $title eq '') {
163: ($title) = ($res->src =~ m:/([^/]*)$:);
164: }
165: $seq_str .= '<tr>'.
166: qq{<td><input type="radio" id="$rb_count" name="problemchoice" value="$value" $checked /></td>}.
167: '<td><label for="'.$rb_count.'">'.$resptype.'</label></td>'.
168: '<td><label for="'.$rb_count.'">'.$title.'</label>';
169: if (scalar(@response_ids) > 1) {
170: $seq_str .= &mt('response').' '.$respid;
171: }
172: my $link = $res->src.'?symb='.
173: &Apache::lonnet::escape($res->symb);
174: $seq_str .= (' 'x2).
175: qq{<a target="preview" href="$link">view</a>};
176: $seq_str .= "</td></tr>\n";
177: $rb_count++;
178: }
179: }
180: }
181: }
182: if ($seq_str ne '') {
183: $Str .= '<tr><td> </td><td colspan="2"><b>'.$seq->compTitle.'</b></td>'.
184: "</tr>\n".$seq_str;
185: }
186: }
187: $Str .= "</table>\n";
188: return $Str;
189: }
190:
191: ####################################################
192: ####################################################
193:
194: =pod
195:
196: =item &MultipleProblemSelector($navmap,$selected,$inputname)
197:
198: Generate HTML with checkboxes for problem selection.
199:
200: Input:
201:
202: $navmap: a navmap object. If undef, navmaps will be called to create a
203: new object.
204:
205: $selected: Scalar, Array, or hash reference of currently selected items.
206:
207: $inputname: The name of the form elements to use for the checkboxs.
208:
209: Returns: A string containing html for a table which lists the sequences
210: and their contents. A checkbox is provided for each problem.
211:
212: =cut
213:
214: ####################################################
215: ####################################################
216: sub MultipleProblemSelector {
217: my ($navmap,$inputname,$formname)=@_;
218: my $cid = $ENV{'request.course.id'};
219: my $Str;
220: # Massage the input as needed.
221: if (! defined($navmap)) {
222: $navmap = Apache::lonnavmaps::navmap->new();
223: if (! defined($navmap)) {
224: $Str .=
225: '<h1>'.&mt('Error: cannot process course structure').'</h1>';
226: return $Str;
227: }
228: }
229: my $selected = {map { ($_,1) } (&get_selected_symbs($inputname))};
230: # Header
231: $Str .= <<"END";
232: <script language="JavaScript" type="text/javascript">
233: function checkall(value,seqid) {
234: for (i=0; i<document.forms.$formname.elements.length; i++) {
235: ele = document.forms.$formname.elements[i];
236: if (ele.name == '$inputname') {
237: if (seqid != null) {
238: itemid = document.forms.$formname.elements[i].id;
239: thing = itemid.split(':');
240: if (thing[0] == seqid) {
241: document.forms.$formname.elements[i].checked=value;
242: }
243: } else {
244: document.forms.$formname.elements[i].checked=value;
245: }
246: }
247: }
248: }
249: </script>
250: END
251: $Str .=
252: '<a href="javascript:checkall(true)">'.&mt('Select All').'</a>'.
253: (' 'x4).
254: '<a href="javascript:checkall(false)">'.&mt('Unselect All').'</a>';
255: $Str .= $/.'<table>'.$/;
256: my $iterator = $navmap->getIterator(undef, undef, undef, 1);
257: my $sequence_string;
258: my $seq_id = 0;
259: my @Accumulator = (&new_accumulator($ENV{'course.'.$cid.'.description'},
260: '',
261: '',
262: $seq_id++,
263: $inputname));
264: my @Sequence_Data;
265: while (my $curRes = $iterator->next()) {
266: if ($curRes == $iterator->END_MAP) {
267: if (ref($Accumulator[-1]) eq 'CODE') {
268: my $old_accumulator = pop(@Accumulator);
269: push(@Sequence_Data,&{$old_accumulator}());
270: }
271: } elsif ($curRes == $iterator->BEGIN_MAP) {
272: # Not much to do here.
273: }
274: next if (! ref($curRes));
275: if ($curRes->is_map) {
276: push(@Accumulator,&new_accumulator($curRes->compTitle,
277: $curRes->src,
278: $curRes->symb,
279: $seq_id++,
280: $inputname));
281: } elsif ($curRes->is_problem) {
282: if (@Accumulator && $Accumulator[-1] ne '') {
283: &{$Accumulator[-1]}($curRes,
284: exists($selected->{$curRes->symb}));
285: }
286: }
287: }
288: my $course_seq = pop(@Sequence_Data);
289: foreach my $seq ($course_seq,@Sequence_Data) {
290: #my $seq = pop(@Sequence_Data);
291: next if (! defined($seq) || ref($seq) ne 'HASH');
292: $Str.= '<tr><td colspan="2">'.
293: '<b>'.$seq->{'title'}.'</b>'.(' 'x2).
294: '<a href="javascript:checkall(true,'.$seq->{'id'}.')">'.
295: &mt('Select').'</a>'.(' 'x2).
296: '<a href="javascript:checkall(false,'.$seq->{'id'}.')">'.
297: &mt('Unselect').'</a>'.(' 'x2).
298: '</td></tr>'.$/;
299: $Str.= $seq->{'html'};
300: }
301: $Str .= '</table>'.$/;
302: return $Str;
303: }
304:
305: sub new_accumulator {
306: my ($title,$src,$symb,$seq_id,$inputname) = @_;
307: my $target;
308: my $item_id=0;
309: return
310: sub {
311: if (@_) {
312: my ($res,$checked) = @_;
313: $target.='<tr><td><label>'.
314: '<input type="checkbox" name="'.$inputname.'" ';
315: if ($checked) {
316: $target .= 'checked ';
317: }
318: $target .= 'id="'.$seq_id.':'.$item_id++.'" ';
319: $target.=
320: 'value="'.&Apache::lonnet::escape($res->symb).'" />'.
321: ' '.$res->compTitle.'</label>'.
322: (' 'x2).'<a target="preview" '.
323: 'href="'.$res->src.'?symb='.
324: &Apache::lonnet::escape($res->symb).'">view</a>'.
325: '</td></tr>'.$/;
326: } else {
327: if (defined($target)) {
328: return { title => $title,
329: symb => $symb,
330: src => $src,
331: id => $seq_id,
332: html => $target, };
333: }
334: return undef;
335: }
336: };
337: }
338:
339: sub get_selected_symbs {
340: my ($inputfield) = @_;
341: my $field = 'form.'.$inputfield;
342: my @Symbs;
343: if (exists($ENV{$field})) {
344: if (! ref($ENV{$field})) {
345: @Symbs = (&Apache::lonnet::unescape($ENV{$field}));
346: } else {
347: @Symbs = (map {&Apache::lonnet::unescape($_);} @{$ENV{$field}});
348: }
349: }
350: return @Symbs;
351: }
352:
353: ####################################################
354: ####################################################
355:
356: =pod
357:
358: =item &make_target_id($target)
359:
360: Inputs: Hash ref with the following entries:
361: $target->{'symb'}, $target->{'part'}, $target->{'respid'},
362: $target->{'resptype'}.
363:
364: Returns: A string, suitable for a form parameter, which uniquely identifies
365: the problem, part, and response to do statistical analysis on.
366:
367: Used by Apache::lonstathelpers::ProblemSelector().
368:
369: =cut
370:
371: ####################################################
372: ####################################################
373: sub make_target_id {
374: my ($target) = @_;
375: my $id = &Apache::lonnet::escape($target->{'symb'}).':'.
376: &Apache::lonnet::escape($target->{'part'}).':'.
377: &Apache::lonnet::escape($target->{'respid'}).':'.
378: &Apache::lonnet::escape($target->{'resptype'});
379: return $id;
380: }
381:
382: ####################################################
383: ####################################################
384:
385: =pod
386:
387: =item &get_target_from_id($id)
388:
389: Inputs: $id, a scalar string from Apache::lonstathelpers::make_target_id().
390:
391: Returns: A hash reference, $target, containing the following keys:
392: $target->{'symb'}, $target->{'part'}, $target->{'respid'},
393: $target->{'resptype'}.
394:
395: =cut
396:
397: ####################################################
398: ####################################################
399: sub get_target_from_id {
400: my ($id) = @_;
401: if (! ref($id)) {
402: my ($symb,$part,$respid,$resptype) = split(':',$id);
403: return ({ symb => &Apache::lonnet::unescape($symb),
404: part => &Apache::lonnet::unescape($part),
405: respid => &Apache::lonnet::unescape($respid),
406: resptype => &Apache::lonnet::unescape($resptype)});
407: } elsif (ref($id) eq 'ARRAY') {
408: my @Return;
409: foreach my $selected (@$id) {
410: my ($symb,$part,$respid,$resptype) = split(':',$selected);
411: push(@Return,{ symb => &Apache::lonnet::unescape($symb),
412: part => &Apache::lonnet::unescape($part),
413: respid => &Apache::lonnet::unescape($respid),
414: resptype => &Apache::lonnet::unescape($resptype)});
415: }
416: return \@Return;
417: }
418: }
419:
420: ####################################################
421: ####################################################
422:
423: =pod
424:
425: =item &get_prev_curr_next($target,$AcceptableResponseTypes,$granularity)
426:
427: Determine the problem parts or responses preceeding and following the
428: current resource.
429:
430: Inputs: $target (see &Apache::lonstathelpers::get_target_from_id())
431: $AcceptableResponseTypes, regular expression matching acceptable
432: response types,
433: $granularity, either 'part', 'response', or 'part_survey'
434:
435: Returns: three hash references, $prev, $curr, $next, which refer to the
436: preceeding, current, or following problem parts or responses, depending
437: on the value of $granularity. Values of undef indicate there is no
438: previous or next part/response. A value of undef for all three indicates
439: there was no match found to the current part/resource.
440:
441: The hash references contain the following keys:
442: symb, part, resource
443:
444: If $granularity eq 'response', the following ADDITIONAL keys will be present:
445: respid, resptype
446:
447: =cut
448:
449: ####################################################
450: ####################################################
451: sub get_prev_curr_next {
452: my ($target,$AcceptableResponseTypes,$granularity) = @_;
453: #
454: # Build an array with the data we need to search through
455: my @Resource;
456: my ($navmap,@sequences) =
457: &Apache::lonstatistics::selected_sequences_with_assessments('all');
458: return $navmap if (! ref($navmap));
459: foreach my $seq (@sequences) {
460: my @resources = &get_resources($navmap,$seq);
461: foreach my $res (@resources) {
462: foreach my $part (@{$res->parts}) {
463: if ($res->is_survey($part) && ($granularity eq 'part_survey')){
464: push (@Resource,
465: { symb => $res->symb,
466: part => $part,
467: resource => $res,
468: } );
469: } elsif ($granularity eq 'part') {
470: push (@Resource,
471: { symb => $res->symb,
472: part => $part,
473: resource => $res,
474: } );
475: } elsif ($granularity eq 'response') {
476: my @response_ids = $res->responseIds($part);
477: my @response_types = $res->responseType($part);
478: for (my $i=0;
479: $i<scalar(@response_ids);
480: $i++){
481: my $respid = $response_ids[$i];
482: my $resptype = $response_types[$i];
483: next if ($resptype !~ m/$AcceptableResponseTypes/);
484: push (@Resource,
485: { symb => $res->symb,
486: part => $part,
487: respid => $respid,
488: resptype => $resptype,
489: resource => $res,
490: } );
491: }
492: }
493: }
494: }
495: }
496: #
497: # Get the index of the current situation
498: my $curr_idx;
499: for ($curr_idx=0;$curr_idx<$#Resource;$curr_idx++) {
500: my $curr_item = $Resource[$curr_idx];
501: if ($granularity eq 'part' || $granularity eq 'part_survey') {
502: if ($curr_item->{'symb'} eq $target->{'symb'} &&
503: $curr_item->{'part'} eq $target->{'part'}) {
504: last;
505: }
506: } elsif ($granularity eq 'response') {
507: if ($curr_item->{'symb'} eq $target->{'symb'} &&
508: $curr_item->{'part'} eq $target->{'part'} &&
509: $curr_item->{'respid'} eq $target->{'respid'} &&
510: $curr_item->{'resptype'} eq $target->{'resptype'}) {
511: last;
512: }
513: }
514: }
515: my $curr_item = $Resource[$curr_idx];
516: if ($granularity eq 'part' || $granularity eq 'part_survey') {
517: if ($curr_item->{'symb'} ne $target->{'symb'} ||
518: $curr_item->{'part'} ne $target->{'part'}) {
519: # bogus symb - return nothing
520: return (undef,undef,undef);
521: }
522: } elsif ($granularity eq 'response') {
523: if ($curr_item->{'symb'} ne $target->{'symb'} ||
524: $curr_item->{'part'} ne $target->{'part'} ||
525: $curr_item->{'respid'} ne $target->{'respid'} ||
526: $curr_item->{'resptype'} ne $target->{'resptype'}){
527: # bogus symb - return nothing
528: return (undef,undef,undef);
529: }
530: }
531: #
532: # Now just pick up the data we need
533: my ($prev,$curr,$next);
534: if ($curr_idx == 0) {
535: $prev = undef;
536: $curr = $Resource[$curr_idx ];
537: $next = $Resource[$curr_idx+1];
538: } elsif ($curr_idx == $#Resource) {
539: $prev = $Resource[$curr_idx-1];
540: $curr = $Resource[$curr_idx ];
541: $next = undef;
542: } else {
543: $prev = $Resource[$curr_idx-1];
544: $curr = $Resource[$curr_idx ];
545: $next = $Resource[$curr_idx+1];
546: }
547: return ($navmap,$prev,$curr,$next);
548: }
549:
550:
551: #####################################################
552: #####################################################
553:
554: =pod
555:
556: =item GetStudentAnswers($r,$problem,$Students)
557:
558: Determines the correct answer for a set of students on a given problem.
559: The students answers are stored in the student hashes pointed to by the
560: array @$Students under the key 'answer'.
561:
562: Inputs: $r
563: $problem: hash reference containing the keys 'resource', 'part', and 'respid'.
564: $Students: reference to array containing student hashes (need 'username',
565: 'domain').
566:
567: Returns: nothing
568:
569: =cut
570:
571: #####################################################
572: #####################################################
573: sub GetStudentAnswers {
574: my ($r,$problem,$Students,$formname,$inputname) = @_;
575: my %answers;
576: my $status_type;
577: if (defined($formname)) {
578: $status_type = 'inline';
579: } else {
580: $status_type = 'popup';
581: }
582: my $c = $r->connection();
583: my %Answers;
584: my ($resource,$partid,$respid) = ($problem->{'resource'},
585: $problem->{'part'},
586: $problem->{'respid'});
587: # Read in the cache (if it exists) before we start timing things.
588: &Apache::lonstathelpers::ensure_proper_cache($resource->{'symb'});
589: # Open progress window
590: my %prog_state=&Apache::lonhtmlcommon::Create_PrgWin
591: ($r,'Student Answer Compilation Status',
592: 'Student Answer Compilation Progress', scalar(@$Students),
593: $status_type,undef,$formname,$inputname);
594: $r->rflush();
595: foreach my $student (@$Students) {
596: last if ($c->aborted());
597: my $sname = $student->{'username'};
598: my $sdom = $student->{'domain'};
599: my $answer = &Apache::lonstathelpers::get_student_answer
600: ($resource,$sname,$sdom,$partid,$respid);
601: &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state,
602: &mt('last student'));
603: $answers{$answer}++;
604: $student->{'answer'} = $answer;
605: }
606: &Apache::lonstathelpers::write_analysis_cache();
607: return if ($c->aborted());
608: $r->rflush();
609: # close progress window
610: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
611: return \%answers;
612: }
613:
614: #####################################################
615: #####################################################
616:
617: =pod
618:
619: =item analyze_problem_as_student
620:
621: Analyzes a homework problem for a student
622:
623: Inputs: $resource: a resource object
624: $sname, $sdom, $partid, $respid
625:
626: Returns: the problem analysis hash
627:
628: =cut
629:
630: #####################################################
631: #####################################################
632: sub analyze_problem_as_student {
633: my ($resource,$sname,$sdom) = @_;
634: if (ref($resource) ne 'HASH') {
635: my $res = $resource;
636: $resource = { 'src' => $res->src,
637: 'symb' => $res->symb,
638: 'parts' => $res->parts };
639: foreach my $part (@{$resource->{'parts'}}) {
640: $resource->{'partdata'}->{$part}->{'ResponseIds'}=
641: [$res->responseIds($part)];
642: }
643: }
644: my $url = $resource->{'src'};
645: my $symb = $resource->{'symb'};
646: my $analysis = &get_from_analysis_cache($sname,$sdom,$symb);
647: if (! defined($analysis)) {
648: my $courseid = $ENV{'request.course.id'};
649: my $Answ=&Apache::lonnet::ssi($url,('grade_target' => 'analyze',
650: 'grade_domain' => $sdom,
651: 'grade_username' => $sname,
652: 'grade_symb' => $symb,
653: 'grade_courseid' => $courseid));
654: (my $garbage,$analysis)=split(/_HASH_REF__/,$Answ,2);
655: &store_analysis($sname,$sdom,$symb,$analysis);
656: }
657: my %Answer=&Apache::lonnet::str2hash($analysis);
658: #
659: return \%Answer;
660: }
661:
662: #####################################################
663: #####################################################
664:
665: =pod
666:
667: =item get_student_answer
668:
669: Analyzes a homework problem for a particular student and returns the correct
670: answer. Attempts to put together an answer for problem types
671: that do not natively support it.
672:
673: Inputs: $resource: a resource object (from navmaps or hash from loncoursedata)
674: $sname, $sdom, $partid, $respid
675:
676: Returns: $answer
677:
678: If $partid and $respid are specified, $answer is simply a scalar containing
679: the correct answer for the response.
680:
681: If $partid or $respid are undefined, $answer will be a hash reference with
682: keys $partid.'.'.$respid.'.answer'.
683:
684: =cut
685:
686: #####################################################
687: #####################################################
688: sub get_student_answer {
689: my ($resource,$sname,$sdom,$partid,$respid) = @_;
690: #
691: if (ref($resource) ne 'HASH') {
692: my $res = $resource;
693: $resource = { 'src' => $res->src,
694: 'symb' => $res->symb,
695: 'parts' => $res->parts };
696: foreach my $part (@{$resource->{'parts'}}) {
697: $resource->{'partdata'}->{$part}->{'ResponseIds'}=
698: [$res->responseIds($part)];
699: }
700: }
701: #
702: my $analysis =
703: &analyze_problem_as_student($resource,$sname,$sdom);
704: my $answer;
705: foreach my $partid (@{$resource->{'parts'}}) {
706: my $partdata = $resource->{'partdata'}->{$partid};
707: foreach my $respid (@{$partdata->{'ResponseIds'}}) {
708: my $prefix = $partid.'.'.$respid;
709: my $key = $prefix.'.answer';
710: $answer->{$partid}->{$respid} =
711: &get_answer($prefix,$key,%$analysis);
712: }
713: }
714: my $returnvalue;
715: if (! defined($partid)) {
716: $returnvalue = $answer;
717: } elsif (! defined($respid)) {
718: $returnvalue = $answer->{$partid};
719: } else {
720: $returnvalue = $answer->{$partid}->{$respid};
721: }
722: return $returnvalue;
723: }
724:
725: sub get_answer {
726: my ($prefix,$key,%Answer) = @_;
727: my $returnvalue;
728: if (exists($Answer{$key})) {
729: my $student_answer = $Answer{$key}->[0];
730: if (! defined($student_answer)) {
731: $student_answer = $Answer{$key}->[1];
732: }
733: $returnvalue = $student_answer;
734: } else {
735: if (exists($Answer{$prefix.'.shown'})) {
736: # The response has foils
737: my %values;
738: while (my ($k,$v) = each(%Answer)) {
739: next if ($k !~ /^$prefix\.foil\.(value|area)\.(.*)$/);
740: my $foilname = $2;
741: $values{$foilname}=$v;
742: }
743: foreach my $foil (@{$Answer{$prefix.'.shown'}}) {
744: if (ref($values{$foil}) eq 'ARRAY') {
745: $returnvalue.=&HTML::Entities::encode($foil,'<>&"').'='.
746: join(',',map {&HTML::Entities::encode($_,'<>&"')} @{$values{$foil}}).'&';
747: } else {
748: $returnvalue.=&HTML::Entities::encode($foil,'<>&"').'='.
749: &HTML::Entities::encode($values{$foil},'<>&"').'&';
750: }
751: }
752: $returnvalue =~ s/ /\%20/g;
753: chop ($returnvalue);
754: }
755: }
756: return $returnvalue;
757: }
758:
759: #####################################################
760: #####################################################
761:
762: =pod
763:
764: =item Caching routines
765:
766: =over 4
767:
768: =item &load_analysis_cache($symb)
769:
770: Loads the cache for the given symb into memory from disk.
771: Requires the cache filename be set.
772: Only should be called by &ensure_proper_cache.
773:
774: =cut
775:
776: #####################################################
777: #####################################################
778: {
779: my $cache_filename = undef;
780: my $current_symb = undef;
781: my %cache;
782:
783: sub load_analysis_cache {
784: my ($symb) = @_;
785: return if (! defined($cache_filename));
786: if (! defined($current_symb) || $current_symb ne $symb) {
787: undef(%cache);
788: my $storedstring;
789: my %cache_db;
790: if (tie(%cache_db,'GDBM_File',$cache_filename,&GDBM_READER(),0640)) {
791: $storedstring = $cache_db{&Apache::lonnet::escape($symb)};
792: untie(%cache_db);
793: }
794: if (defined($storedstring)) {
795: %cache = %{thaw($storedstring)};
796: }
797: }
798: return;
799: }
800:
801: #####################################################
802: #####################################################
803:
804: =pod
805:
806: =item &get_from_analysis_cache($sname,$sdom,$symb,$partid,$respid)
807:
808: Returns the appropriate data from the cache, or undef if no data exists.
809:
810: =cut
811:
812: #####################################################
813: #####################################################
814: sub get_from_analysis_cache {
815: my ($sname,$sdom,$symb) = @_;
816: &ensure_proper_cache($symb);
817: my $returnvalue;
818: if (exists($cache{$sname.':'.$sdom})) {
819: $returnvalue = $cache{$sname.':'.$sdom};
820: } else {
821: $returnvalue = undef;
822: }
823: return $returnvalue;
824: }
825:
826: #####################################################
827: #####################################################
828:
829: =pod
830:
831: =item &write_analysis_cache($symb)
832:
833: Writes the in memory cache to disk so that it can be read in with
834: &load_analysis_cache($symb).
835:
836: =cut
837:
838: #####################################################
839: #####################################################
840: sub write_analysis_cache {
841: return if (! defined($current_symb) || ! defined($cache_filename));
842: my %cache_db;
843: my $key = &Apache::lonnet::escape($current_symb);
844: if (tie(%cache_db,'GDBM_File',$cache_filename,&GDBM_WRCREAT(),0640)) {
845: my $storestring = freeze(\%cache);
846: $cache_db{$key}=$storestring;
847: $cache_db{$key.'.time'}=time;
848: untie(%cache_db);
849: }
850: undef(%cache);
851: undef($current_symb);
852: undef($cache_filename);
853: return;
854: }
855:
856: #####################################################
857: #####################################################
858:
859: =pod
860:
861: =item &ensure_proper_cache($symb)
862:
863: Called to make sure we have the proper cache set up. This is called
864: prior to every analysis lookup.
865:
866: =cut
867:
868: #####################################################
869: #####################################################
870: sub ensure_proper_cache {
871: my ($symb) = @_;
872: my $cid = $ENV{'request.course.id'};
873: my $new_filename = '/home/httpd/perl/tmp/'.
874: 'problemanalysis_'.$cid.'_analysis_cache.db';
875: if (! defined($cache_filename) ||
876: $cache_filename ne $new_filename ||
877: ! defined($current_symb) ||
878: $current_symb ne $symb) {
879: $cache_filename = $new_filename;
880: # Notice: $current_symb is not set to $symb until after the cache is
881: # loaded. This is what tells &load_analysis_cache to load in a new
882: # symb cache.
883: &load_analysis_cache($symb);
884: $current_symb = $symb;
885: }
886: }
887:
888: #####################################################
889: #####################################################
890:
891: =pod
892:
893: =item &store_analysis($sname,$sdom,$symb,$partid,$respid,$dataset)
894:
895: Stores the analysis data in the in memory cache.
896:
897: =cut
898:
899: #####################################################
900: #####################################################
901: sub store_analysis {
902: my ($sname,$sdom,$symb,$dataset) = @_;
903: return if ($symb ne $current_symb);
904: $cache{$sname.':'.$sdom}=$dataset;
905: return;
906: }
907:
908: }
909: #####################################################
910: #####################################################
911:
912: =pod
913:
914: =back
915:
916: =cut
917:
918: #####################################################
919: #####################################################
920:
921: ##
922: ## The following is copied from datecalc1.pl, part of the
923: ## Spreadsheet::WriteExcel CPAN module.
924: ##
925: ##
926: ######################################################################
927: #
928: # Demonstration of writing date/time cells to Excel spreadsheets,
929: # using UNIX/Perl time as source of date/time.
930: #
931: # Copyright 2000, Andrew Benham, adsb@bigfoot.com
932: #
933: ######################################################################
934: #
935: # UNIX/Perl time is the time since the Epoch (00:00:00 GMT, 1 Jan 1970)
936: # measured in seconds.
937: #
938: # An Excel file can use exactly one of two different date/time systems.
939: # In these systems, a floating point number represents the number of days
940: # (and fractional parts of the day) since a start point. The floating point
941: # number is referred to as a 'serial'.
942: # The two systems ('1900' and '1904') use different starting points:
943: # '1900'; '1.00' is 1 Jan 1900 BUT 1900 is erroneously regarded as
944: # a leap year - see:
945: # http://support.microsoft.com/support/kb/articles/Q181/3/70.asp
946: # for the excuse^H^H^H^H^H^Hreason.
947: # '1904'; '1.00' is 2 Jan 1904.
948: #
949: # The '1904' system is the default for Apple Macs. Windows versions of
950: # Excel have the option to use the '1904' system.
951: #
952: # Note that Visual Basic's "DateSerial" function does NOT erroneously
953: # regard 1900 as a leap year, and thus its serials do not agree with
954: # the 1900 serials of Excel for dates before 1 Mar 1900.
955: #
956: # Note that StarOffice (at least at version 5.2) does NOT erroneously
957: # regard 1900 as a leap year, and thus its serials do not agree with
958: # the 1900 serials of Excel for dates before 1 Mar 1900.
959: #
960: ######################################################################
961: #
962: # Calculation description
963: # =======================
964: #
965: # 1900 system
966: # -----------
967: # Unix time is '0' at 00:00:00 GMT 1 Jan 1970, i.e. 70 years after 1 Jan 1900.
968: # Of those 70 years, 17 (1904,08,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68)
969: # were leap years with an extra day.
970: # Thus there were 17 + 70*365 days = 25567 days between 1 Jan 1900 and
971: # 1 Jan 1970.
972: # In the 1900 system, '1' is 1 Jan 1900, but as 1900 was not a leap year
973: # 1 Jan 1900 should really be '2', so 1 Jan 1970 is '25569'.
974: #
975: # 1904 system
976: # -----------
977: # Unix time is '0' at 00:00:00 GMT 1 Jan 1970, i.e. 66 years after 1 Jan 1904.
978: # Of those 66 years, 17 (1904,08,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68)
979: # were leap years with an extra day.
980: # Thus there were 17 + 66*365 days = 24107 days between 1 Jan 1904 and
981: # 1 Jan 1970.
982: # In the 1904 system, 2 Jan 1904 being '1', 1 Jan 1970 is '24107'.
983: #
984: ######################################################################
985: #
986: # Copyright (c) 2000, Andrew Benham.
987: # This program is free software. It may be used, redistributed and/or
988: # modified under the same terms as Perl itself.
989: #
990: # Andrew Benham, adsb@bigfoot.com
991: # London, United Kingdom
992: # 11 Nov 2000
993: #
994: ######################################################################
995: #-----------------------------------------------------------
996: # calc_serial()
997: #
998: # Called with (up to) 2 parameters.
999: # 1. Unix timestamp. If omitted, uses current time.
1000: # 2. GMT flag. Set to '1' to return serial in GMT.
1001: # If omitted, returns serial in appropriate timezone.
1002: #
1003: # Returns date/time serial according to $DATE_SYSTEM selected
1004: #-----------------------------------------------------------
1005: sub calc_serial {
1006: # Use 1900 date system on all platforms other than Apple Mac (for which
1007: # use 1904 date system).
1008: my $DATE_SYSTEM = ($^O eq 'MacOS') ? 1 : 0;
1009: my $time = (defined $_[0]) ? $_[0] : time();
1010: my $gmtflag = (defined $_[1]) ? $_[1] : 0;
1011: #
1012: # Divide timestamp by number of seconds in a day.
1013: # This gives a date serial with '0' on 1 Jan 1970.
1014: my $serial = $time / 86400;
1015: #
1016: # Adjust the date serial by the offset appropriate to the
1017: # currently selected system (1900/1904).
1018: if ($DATE_SYSTEM == 0) { # use 1900 system
1019: $serial += 25569;
1020: } else { # use 1904 system
1021: $serial += 24107;
1022: }
1023: #
1024: unless ($gmtflag) {
1025: # Now have a 'raw' serial with the right offset. But this
1026: # gives a serial in GMT, which is false unless the timezone
1027: # is GMT. We need to adjust the serial by the appropriate
1028: # timezone offset.
1029: # Calculate the appropriate timezone offset by seeing what
1030: # the differences between localtime and gmtime for the given
1031: # time are.
1032: #
1033: my @gmtime = gmtime($time);
1034: my @ltime = localtime($time);
1035: #
1036: # For the first 7 elements of the two arrays, adjust the
1037: # date serial where the elements differ.
1038: for (0 .. 6) {
1039: my $diff = $ltime[$_] - $gmtime[$_];
1040: if ($diff) {
1041: $serial += _adjustment($diff,$_);
1042: }
1043: }
1044: }
1045: #
1046: # Perpetuate the error that 1900 was a leap year by decrementing
1047: # the serial if we're using the 1900 system and the date is prior to
1048: # 1 Mar 1900. This has the effect of making serial value '60'
1049: # 29 Feb 1900.
1050: #
1051: # This fix only has any effect if UNIX/Perl time on the platform
1052: # can represent 1900. Many can't.
1053: #
1054: unless ($DATE_SYSTEM) {
1055: $serial-- if ($serial < 61); # '61' is 1 Mar 1900
1056: }
1057: return $serial;
1058: }
1059:
1060: sub _adjustment {
1061: # Based on the difference in the localtime/gmtime array elements
1062: # number, return the adjustment required to the serial.
1063: #
1064: # We only look at some elements of the localtime/gmtime arrays:
1065: # seconds unlikely to be different as all known timezones
1066: # have an offset of integral multiples of 15 minutes,
1067: # but it's easy to do.
1068: # minutes will be different for timezone offsets which are
1069: # not an exact number of hours.
1070: # hours very likely to be different.
1071: # weekday will differ when localtime/gmtime difference
1072: # straddles midnight.
1073: #
1074: # Assume that difference between localtime and gmtime is less than
1075: # 5 days, then don't have to do maths for day of month, month number,
1076: # year number, etc...
1077: #
1078: my ($delta,$element) = @_;
1079: my $adjust = 0;
1080: #
1081: if ($element == 0) { # Seconds
1082: $adjust = $delta/86400; # 60 * 60 * 24
1083: } elsif ($element == 1) { # Minutes
1084: $adjust = $delta/1440; # 60 * 24
1085: } elsif ($element == 2) { # Hours
1086: $adjust = $delta/24; # 24
1087: } elsif ($element == 6) { # Day of week number
1088: # Catch difference straddling Sat/Sun in either direction
1089: $delta += 7 if ($delta < -4);
1090: $delta -= 7 if ($delta > 4);
1091: #
1092: $adjust = $delta;
1093: }
1094: return $adjust;
1095: }
1096:
1097: ###########################################################
1098: ###########################################################
1099:
1100: =pod
1101:
1102: =item get_problem_data
1103:
1104: Returns a data structure describing the problem.
1105:
1106: Inputs: $url
1107:
1108: Returns: %Partdata
1109:
1110: =cut
1111:
1112: ## note: we must force each foil and option to not begin or end with
1113: ## spaces as they are stored without such data.
1114: ##
1115: ###########################################################
1116: ###########################################################
1117: sub get_problem_data {
1118: my ($url) = @_;
1119: my $Answ=&Apache::lonnet::ssi($url,('grade_target' => 'analyze'));
1120: (my $garbage,$Answ)=split(/_HASH_REF__/,$Answ,2);
1121: my %Answer;
1122: %Answer=&Apache::lonnet::str2hash($Answ);
1123: my %Partdata;
1124: foreach my $part (@{$Answer{'parts'}}) {
1125: while (my($key,$value) = each(%Answer)) {
1126: #
1127: # Logging code:
1128: if (0) {
1129: &Apache::lonnet::logthis($part.' got key "'.$key.'"');
1130: if (ref($value) eq 'ARRAY') {
1131: &Apache::lonnet::logthis(' @'.join(',',@$value));
1132: } else {
1133: &Apache::lonnet::logthis(' '.$value);
1134: }
1135: }
1136: # End of logging code
1137: next if ($key !~ /^$part/);
1138: $key =~ s/^$part\.//;
1139: if (ref($value) eq 'ARRAY') {
1140: if ($key eq 'options') {
1141: $Partdata{$part}->{'_Options'}=$value;
1142: } elsif ($key eq 'concepts') {
1143: $Partdata{$part}->{'_Concepts'}=$value;
1144: } elsif ($key eq 'items') {
1145: $Partdata{$part}->{'_Items'}=$value;
1146: } elsif ($key =~ /^concept\.(.*)$/) {
1147: my $concept = $1;
1148: foreach my $foil (@$value) {
1149: $Partdata{$part}->{'_Foils'}->{$foil}->{'_Concept'}=
1150: $concept;
1151: }
1152: } elsif ($key =~ /^(unit|incorrect|answer|ans_low|ans_high|str_type)$/) {
1153: $Partdata{$part}->{$key}=$value;
1154: }
1155: } else {
1156: if ($key=~ /^foil\.text\.(.*)$/) {
1157: my $foil = $1;
1158: $Partdata{$part}->{'_Foils'}->{$foil}->{'name'}=$foil;
1159: $value =~ s/(\s*$|^\s*)//g;
1160: $Partdata{$part}->{'_Foils'}->{$foil}->{'text'}=$value;
1161: } elsif ($key =~ /^foil\.value\.(.*)$/) {
1162: my $foil = $1;
1163: $Partdata{$part}->{'_Foils'}->{$foil}->{'value'}=$value;
1164: } elsif ($key eq 'answercomputed') {
1165: $Partdata{$part}->{'answercomputed'} = $value;
1166: }
1167: }
1168: }
1169: }
1170: # Further debugging code
1171: if (0) {
1172: &Apache::lonnet::logthis('lonstathelpers::get_problem_data');
1173: &log_hash_ref(\%Partdata);
1174: }
1175: return %Partdata;
1176: }
1177:
1178: sub log_array_ref {
1179: my ($arrayref,$prefix) = @_;
1180: return if (ref($arrayref) ne 'ARRAY');
1181: if (! defined($prefix)) { $prefix = ''; };
1182: foreach my $v (@$arrayref) {
1183: if (ref($v) eq 'ARRAY') {
1184: &log_array_ref($v,$prefix.' ');
1185: } elsif (ref($v) eq 'HASH') {
1186: &log_hash_ref($v,$prefix.' ');
1187: } else {
1188: &Apache::lonnet::logthis($prefix.'"'.$v.'"');
1189: }
1190: }
1191: }
1192:
1193: sub log_hash_ref {
1194: my ($hashref,$prefix) = @_;
1195: return if (ref($hashref) ne 'HASH');
1196: if (! defined($prefix)) { $prefix = ''; };
1197: while (my ($k,$v) = each(%$hashref)) {
1198: if (ref($v) eq 'ARRAY') {
1199: &Apache::lonnet::logthis($prefix.'"'.$k.'" = array');
1200: &log_array_ref($v,$prefix.' ');
1201: } elsif (ref($v) eq 'HASH') {
1202: &Apache::lonnet::logthis($prefix.'"'.$k.'" = hash');
1203: &log_hash_ref($v,$prefix.' ');
1204: } else {
1205: &Apache::lonnet::logthis($prefix.'"'.$k.'" => "'.$v.'"');
1206: }
1207: }
1208: }
1209: ####################################################
1210: ####################################################
1211:
1212: =pod
1213:
1214: =item &limit_by_time()
1215:
1216: =cut
1217:
1218: ####################################################
1219: ####################################################
1220: sub limit_by_time_form {
1221: my $Starttime_form = '';
1222: my $starttime = &Apache::lonhtmlcommon::get_date_from_form
1223: ('limitby_startdate');
1224: my $endtime = &Apache::lonhtmlcommon::get_date_from_form
1225: ('limitby_enddate');
1226: if (! defined($endtime)) {
1227: $endtime = time;
1228: }
1229: if (! defined($starttime)) {
1230: $starttime = $endtime - 60*60*24*7;
1231: }
1232: my $state;
1233: if (&limit_by_time()) {
1234: $state = '';
1235: } else {
1236: $state = 'disabled';
1237: }
1238: my $startdateform = &Apache::lonhtmlcommon::date_setter
1239: ('Statistics','limitby_startdate',$starttime,undef,undef,$state);
1240: my $enddateform = &Apache::lonhtmlcommon::date_setter
1241: ('Statistics','limitby_enddate',$endtime,undef,undef,$state);
1242: my $Str;
1243: $Str .= '<script language="Javascript" >';
1244: $Str .= 'function toggle_limitby_activity(state) {';
1245: $Str .= ' if (state) {';
1246: $Str .= ' limitby_startdate_enable();';
1247: $Str .= ' limitby_enddate_enable();';
1248: $Str .= ' } else {';
1249: $Str .= ' limitby_startdate_disable();';
1250: $Str .= ' limitby_enddate_disable();';
1251: $Str .= ' }';
1252: $Str .= '}';
1253: $Str .= '</script>';
1254: $Str .= '<fieldset>';
1255: my $timecheckbox = '<input type="checkbox" name="limit_by_time" ';
1256: if (&limit_by_time()) {
1257: $timecheckbox .= ' checked ';
1258: }
1259: $timecheckbox .= 'OnChange="javascript:toggle_limitby_activity(this.checked);" ';
1260: $timecheckbox .= ' />';
1261: $Str .= '<legend>'.&mt('[_1] Limit by time',$timecheckbox).'</legend>';
1262: $Str .= &mt('Start Time: [_1]',$startdateform).'<br />';
1263: $Str .= &mt(' End Time: [_1]',$enddateform).'<br />';
1264: $Str .= '</fieldset>';
1265: return $Str;
1266: }
1267:
1268: sub limit_by_time {
1269: if (exists($ENV{'form.limit_by_time'}) &&
1270: $ENV{'form.limit_by_time'} ne '' ) {
1271: return 1;
1272: } else {
1273: return 0;
1274: }
1275: }
1276:
1277: sub get_time_limits {
1278: my $starttime = &Apache::lonhtmlcommon::get_date_from_form
1279: ('limitby_startdate');
1280: my $endtime = &Apache::lonhtmlcommon::get_date_from_form
1281: ('limitby_enddate');
1282: return ($starttime,$endtime);
1283: }
1284:
1285:
1286:
1287: ####################################################
1288: ####################################################
1289:
1290: =pod
1291:
1292: =item sections_description
1293:
1294: Inputs: @Sections, an array of sections
1295:
1296: Returns: A text description of the sections selected.
1297:
1298: =cut
1299:
1300: ####################################################
1301: ####################################################
1302: sub sections_description {
1303: my @Sections = @_;
1304: my $sectionstring = '';
1305: if (scalar(@Sections) > 1) {
1306: if (scalar(@Sections) > 2) {
1307: my $last = pop(@Sections);
1308: $sectionstring = "Sections ".join(', ',@Sections).', and '.$last;
1309: } else {
1310: $sectionstring = "Sections ".join(' and ',@Sections);
1311: }
1312: } else {
1313: if ($Sections[0] eq 'all') {
1314: $sectionstring = "All sections";
1315: } else {
1316: $sectionstring = "Section ".$Sections[0];
1317: }
1318: }
1319: return $sectionstring;
1320: }
1321:
1322: ####################################################
1323: ####################################################
1324:
1325: =pod
1326:
1327: =item &manage_caches
1328:
1329: Inputs: $r, apache request object
1330:
1331: Returns: An array of scalars containing html for buttons.
1332:
1333: =cut
1334:
1335: ####################################################
1336: ####################################################
1337: sub manage_caches {
1338: my ($r,$formname,$inputname,$update_message) = @_;
1339: &Apache::loncoursedata::clear_internal_caches();
1340: my $sectionkey =
1341: join(',',
1342: map {
1343: &Apache::lonnet::escape($_);
1344: } sort(@Apache::lonstatistics::SelectedSections)
1345: );
1346: my $statuskey = $Apache::lonstatistics::enrollment_status;
1347: if (exists($ENV{'form.ClearCache'}) ||
1348: exists($ENV{'form.updatecaches'}) ||
1349: (exists($ENV{'form.firstrun'}) && $ENV{'form.firstrun'} ne 'no') ||
1350: (exists($ENV{'form.prevsection'}) &&
1351: $ENV{'form.prevsection'} ne $sectionkey) ||
1352: (exists($ENV{'form.prevenrollstatus'}) &&
1353: $ENV{'form.prevenrollstatus'} ne $statuskey)
1354: ) {
1355: if (defined($update_message)) {
1356: $r->print($update_message);
1357: }
1358: if (0) {
1359: &Apache::lonnet::logthis('Updating mysql student data caches');
1360: }
1361: &gather_full_student_data($r,$formname,$inputname);
1362: }
1363: #
1364: my @Buttons =
1365: ('<input type="submit" name="ClearCache" '.
1366: 'value="'.&mt('Clear Caches').'" />',
1367: '<input type="submit" name="updatecaches" '.
1368: 'value="'.&mt('Update Caches').'" />'.
1369: &Apache::loncommon::help_open_topic('Statistics_Cache'),
1370: '<input type="hidden" name="prevsection" value="'.$sectionkey.'" />',
1371: '<input type="hidden" name="prevenrollstatus" value="'.$statuskey.'" />'
1372: );
1373: #
1374: if (! exists($ENV{'form.firstrun'})) {
1375: $r->print('<input type="hidden" name="firstrun" value="yes" />');
1376: } else {
1377: $r->print('<input type="hidden" name="firstrun" value="no" />');
1378: }
1379: #
1380: return @Buttons;
1381: }
1382:
1383: sub gather_full_student_data {
1384: my ($r,$formname,$inputname) = @_;
1385: my $status_type;
1386: if (defined($formname)) {
1387: $status_type = 'inline';
1388: } else {
1389: $status_type = 'popup';
1390: }
1391: my $c = $r->connection();
1392: #
1393: &Apache::loncoursedata::clear_internal_caches();
1394: #
1395: my @Students = @Apache::lonstatistics::Students;
1396: #
1397: # Open the progress window
1398: my %prog_state=&Apache::lonhtmlcommon::Create_PrgWin
1399: ($r,&mt('Student Data Compilation Status'),
1400: &mt('Student Data Compilation Progress'), scalar(@Students),
1401: $status_type,undef,$formname,$inputname);
1402: #
1403: while (my $student = shift @Students) {
1404: return if ($c->aborted());
1405: my $status = &Apache::loncoursedata::ensure_current_full_data
1406: ($student->{'username'},$student->{'domain'},
1407: $ENV{'request.course.id'});
1408: &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state,
1409: &mt('last student'));
1410: }
1411: &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
1412: $r->rflush();
1413: return;
1414: }
1415:
1416: ####################################################
1417: ####################################################
1418:
1419: =pod
1420:
1421: =item &submission_report_form
1422:
1423: Input: The originating reportSelected value for the current stats page.
1424:
1425: Output: Scalar containing HTML with needed form elements and a link to
1426: the student submission reports page.
1427:
1428: =cut
1429:
1430: ####################################################
1431: ####################################################
1432: sub submission_report_form {
1433: my ($original_report) = @_;
1434: # Note: In the link below we change the reportSelected value. If
1435: # the user hits the 'back' button on the browser after getting their
1436: # student submissions report, this value may still be around. So we
1437: # output a script block to set it properly. If the $original_report
1438: # value is unset, you are just asking for trouble.
1439: if (! defined($original_report)) {
1440: &Apache::lonnet::logthis
1441: ('someone called lonstathelpers::submission_report_form without '.
1442: ' enough input.');
1443: }
1444: my $html = $/.
1445: '<script type="Text/JavaScript">'.
1446: "document.Statistics.reportSelected.value='$original_report';".
1447: '</script>'.
1448: '<input type="hidden" name="correctans" value="true" />'.
1449: '<input type="hidden" name="prob_status" value="true" />'.
1450: '<input type="hidden" name="all_sub" value="true" />';
1451: my $output_selector = $/.'<select name="output">'.$/;
1452: foreach ('HTML','Excel','CSV') {
1453: $output_selector .= ' <option value="'.lc($_).'"';
1454: if ($ENV{'form.output'} eq lc($_)) {
1455: $output_selector .= ' selected ';
1456: }
1457: $output_selector .='>'.&mt($_).'</option>'.$/;
1458: }
1459: $output_selector .= '</select>'.$/;
1460: my $link = '<a href="javascript:'.
1461: q{document.Statistics.reportSelected.value='student_submission_reports';}.
1462: 'document.Statistics.submit();">';
1463: $html.= &mt('View data as [_1] [_2]go[_3]',$output_selector,
1464: $link,'</a>').$/;
1465: return $html
1466: }
1467:
1468: ####################################################
1469: ####################################################
1470:
1471: =pod
1472:
1473: =back
1474:
1475: =cut
1476:
1477: ####################################################
1478: ####################################################
1479:
1480: 1;
1481:
1482: __END__
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