Annotation of loncom/interface/statistics/lonstathelpers.pm, revision 1.76

1.1       matthew     1: # The LearningOnline Network with CAPA
                      2: #
1.76    ! raeburn     3: # $Id: lonstathelpers.pm,v 1.75 2017/12/18 23:51:19 raeburn Exp $
1.1       matthew     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;
1.46      albertel   52: use Apache::lonnet;
1.1       matthew    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();
1.8       matthew    61: use GDBM_File;
                     62: use Storable qw(freeze thaw);
1.53      www        63: use lib '/home/httpd/lib/perl/';
                     64: use LONCAPA;
                     65:  
1.1       matthew    66: 
                     67: ####################################################
                     68: ####################################################
                     69: 
                     70: =pod
                     71: 
                     72: =item &render_resource($resource)
                     73: 
1.42      matthew    74: Input: a navmaps resource
1.1       matthew    75: 
                     76: Retunrs: a scalar containing html for a rendering of the problem
                     77: within a table.
                     78: 
                     79: =cut
                     80: 
                     81: ####################################################
                     82: ####################################################
                     83: sub render_resource {
                     84:     my ($resource) = @_;
                     85:     ##
                     86:     ## Render the problem
1.43      matthew    87:     my ($base) = ($resource->src =~ m|^(.*/)[^/]*$|);
                     88:     $base="http://".$ENV{'SERVER_NAME'}.$base;
1.55      raeburn    89:     my ($src,$symb)=($resource->link,&escape($resource->shown_symb));
1.40      matthew    90:     my $rendered_problem = &Apache::lonnet::ssi_body($src.'?symb='.$symb);
1.1       matthew    91:     $rendered_problem =~ s/<\s*form\s*/<nop /g;
                     92:     $rendered_problem =~ s|(<\s*/form\s*>)|<\/nop>|g;
1.70      golterma   93:     return '<div class="LC_Box">'.
                     94:         '<h4 class="LC_hcell">'.&mt('Problem').'</h4>'.
                     95:         '<base href="'.$base.'" />'.$rendered_problem.
                     96:         '</div>';
1.1       matthew    97: }
1.2       matthew    98: 
                     99: ####################################################
                    100: ####################################################
                    101: 
                    102: =pod
                    103: 
1.40      matthew   104: =item &get_resources
                    105: 
                    106: =cut
                    107: 
                    108: ####################################################
                    109: ####################################################
                    110: sub get_resources {
1.75      raeburn   111:     my ($navmap,$sequence,$include_tools) = @_;
                    112:     my @resources;
                    113:     if ($include_tools) {
                    114:         @resources = $navmap->retrieveResources($sequence,
                    115:                                                 sub { shift->is_gradable(); },
                    116:                                                 0,0,0);
                    117:     } else {
                    118:         @resources = $navmap->retrieveResources($sequence,
                    119:                                                 sub { shift->is_problem(); },
                    120:                                                 0,0,0);
                    121:     }
1.40      matthew   122:     return @resources;
                    123: }
                    124: 
                    125: ####################################################
                    126: ####################################################
                    127: 
                    128: =pod
                    129: 
                    130: =item &problem_selector($AcceptedResponseTypes)
1.2       matthew   131: 
                    132: Input: scalar containing regular expression which matches response
                    133: types to show.  '.' will yield all, '(option|radiobutton)' will match
                    134: all option response and radiobutton problems.
                    135: 
                    136: Returns: A string containing html for a table which lists the sequences
                    137: and their contents.  A radiobutton is provided for each problem.
1.14      matthew   138: Skips 'survey' problems.
1.2       matthew   139: 
                    140: =cut
                    141: 
                    142: ####################################################
                    143: ####################################################
1.40      matthew   144: sub problem_selector {
1.76    ! raeburn   145:     my ($AcceptedResponseTypes,$sequence_addendum,$symbmode,$all,$prefix,
        !           146:         $byres,$include_tools,$smallbox,$onclick) = @_;
1.65      www       147: # all: also make sequences selectable
                    148: # prefix: prefix for all form names
1.76    ! raeburn   149: # byres: radiobutton shown per resource
        !           150: # include_tools: external tools included 
1.65      www       151: # smallbox: use smaller box
                    152: # onclick: javascript to execute when clicked
1.2       matthew   153:     my $Str;
1.65      www       154:     my $jsadd='';
                    155:     if ($onclick) {
1.71      bisitz    156:         $jsadd="onclick='$onclick'";
1.65      www       157:     }
1.66      www       158:     $Str =  &Apache::loncommon::start_scrollbox(($smallbox?'420px':'620px'),
                    159:                                                 ($smallbox?'400px':'600px'),
                    160:                                                 ($smallbox?'60px':'300px')).
1.65      www       161:             &Apache::loncommon::start_data_table();
1.27      matthew   162:     my $rb_count =0;
1.40      matthew   163:     my ($navmap,@sequences) = 
                    164:         &Apache::lonstatistics::selected_sequences_with_assessments('all');
                    165:     return $navmap if (! ref($navmap)); # error
                    166:     foreach my $seq (@sequences) {
1.2       matthew   167:         my $seq_str = '';
1.75      raeburn   168:         foreach my $res (&get_resources($navmap,$seq,$include_tools)) {
1.76    ! raeburn   169:             my $title = $res->compTitle;
        !           170:             if (! defined($title) || $title eq '') {
        !           171:                 ($title) = ($res->src =~ m:/([^/]*)$:);
        !           172:             }
        !           173:             my $totalresps = 0;
        !           174:             if ($byres) {
        !           175:                 foreach my $part (@{$res->parts}) {
        !           176:                     $totalresps += scalar($res->responseIds($part));
        !           177:                 }
        !           178:                 my $value = &HTML::Entities::encode($res->symb(),'<>&"');
        !           179:                 my $checked;
        !           180:                 if ($env{'form.problemchoice'} eq $res->symb()) {
        !           181:                     $checked = ' checked="checked"';
        !           182:                 }
        !           183:                 $seq_str .= &Apache::loncommon::start_data_table_row().
        !           184:                             '<td rowspan="'.$totalresps.'" style="vertical-align:middle">'.
        !           185:                             '<label><input type="radio" name="symb" value="'.$value.'"'.$checked.' />'.
        !           186:                             $title.'</label>';
        !           187:                 my $link = $res->link.'?symb='.&escape($res->shown_symb);
        !           188:                 $seq_str .= ('&nbsp;'x2).
        !           189:                             '<a target="preview" href="'.$link.'">'.&mt('view').'</a></td>';
        !           190:             }
        !           191:             my %partsseen;
1.40      matthew   192:             foreach my $part (@{$res->parts}) {
1.75      raeburn   193:                 my (@response_ids,@response_types);
                    194:                 if ($res->is_tool) {
                    195:                     @response_ids = ();
                    196:                     @response_types = ('tool');
                    197:                 } else {
                    198:                     @response_ids   = $res->responseIds($part);
                    199:                     @response_types = $res->responseType($part);
                    200:                 }
1.40      matthew   201:                 for (my $i=0;$i<scalar(@response_types);$i++){
                    202:                     my $respid = $response_ids[$i];
                    203:                     my $resptype = $response_types[$i];
1.2       matthew   204:                     if ($resptype =~ m/$AcceptedResponseTypes/) {
1.76    ! raeburn   205:                         if ($byres) {
        !           206:                             unless (exists($partsseen{$part})) {
        !           207:                                 my $parttitle = $part;
        !           208:                                 if ($part eq '0') {
        !           209:                                     $parttitle = '';
        !           210:                                 }
        !           211:                                 if ($parttitle ne '') {
        !           212:                                     $parttitle = ('&nbsp;'x2).&mt('part').':&nbsp;'.$parttitle;
        !           213:                                 }
        !           214:                                 if (keys(%partsseen)) {
        !           215:                                     $seq_str .= &Apache::loncommon::continue_data_table_row();
        !           216:                                 }
        !           217:                                 unless ($partsseen{$part}) {
        !           218:                                     $seq_str .= '<td rowspan="'.scalar(@response_ids).'" style="vertical-align:middle">'.
        !           219:                                                 $parttitle.'</td>';
        !           220:                                     $partsseen{$part} = scalar(@response_ids);
        !           221:                                 }
        !           222:                             }
        !           223:                             $seq_str .= '<td>'.$resptype;
        !           224:                             if (scalar(@response_ids) > 1) {
        !           225:                                 $seq_str .= '&nbsp;'.&mt('id').':&nbsp;'.$respid;
        !           226:                             }
        !           227:                             $seq_str .= '</td>'. &Apache::loncommon::end_data_table_row()."\n";
        !           228:                         } else {
        !           229:                             my $value = &make_target_id({symb=>$res->symb,
        !           230:                                                          part=>$part,
        !           231:                                                          respid=>$respid,
        !           232:                                                          resptype=>$resptype});
        !           233:                             my $checked = '';
        !           234:                             if ($env{'form.problemchoice'} eq $value) {
        !           235:                                 $checked = ' checked="checked"';
        !           236:                             }
        !           237:                             $seq_str .= &Apache::loncommon::start_data_table_row().
        !           238:                                 ($symbmode?
        !           239:                                  '<td><input type="radio" id="'.$prefix.$rb_count.'" name="'.$prefix.'symb" value="'.&HTML::Entities::encode($res->symb,'<>&"').'" '.$checked.' '.
        !           240:                                  $jsadd.
        !           241:                                  ' /></td>'
        !           242:                                  :qq{<td><input type="radio" id="$rb_count" name="problemchoice" value="$value"$checked /></td>}).
        !           243:                                 '<td><label for="'.$prefix.$rb_count.'">'.$resptype.'</label></td>'.
        !           244:                                 '<td><label for="'.$prefix.$rb_count.'">'.$title.'</label>';
        !           245:                             if (scalar(@response_ids) > 1) {
        !           246:                                 $seq_str .= &mt('response').' '.$respid;
        !           247:                             }
        !           248:                             my $link = $res->link.'?symb='.&escape($res->shown_symb);
        !           249:                             $seq_str .= ('&nbsp;'x2).
        !           250:                                         '<a target="preview" href="'.$link.'">'.&mt('view').'</a>';
        !           251:                             $seq_str .= "</td>". &Apache::loncommon::end_data_table_row()."\n";
        !           252:                             $rb_count++;
1.2       matthew   253:                         }
                    254:                     }
                    255:                 }
                    256:             }
                    257:         }
                    258:         if ($seq_str ne '') {
1.76    ! raeburn   259:             if ($byres) {
1.61      www       260:                 $Str .= &Apache::loncommon::start_data_table_header_row().
1.76    ! raeburn   261:                         '<th colspan="3">'.$seq->compTitle.'</th>'.
        !           262:                         &Apache::loncommon::end_data_table_header_row().
        !           263:                         $seq_str;
        !           264:             } else {
        !           265:                 $Str .= &Apache::loncommon::start_data_table_header_row().
        !           266:                     '<th colspan="3">'.
        !           267:                     ($all?'<input type="radio" id="'.$prefix.'s'.$rb_count.'" name="'.$prefix.'symb" value="'.&HTML::Entities::encode($seq->symb,'<>&').'" '.$jsadd.' />':'').
        !           268:                     $seq->compTitle.'</th>'.
        !           269:                     &Apache::loncommon::end_data_table_header_row()."\n".$seq_str;
        !           270:                 if (defined($sequence_addendum)) {
        !           271:                     $Str .= &Apache::loncommon::start_data_table_header_row().
        !           272:                         ('<td>&nbsp;</td>'x2).
        !           273:                         '<td align="right">'.$sequence_addendum.'</td>'.
        !           274:                         &Apache::loncommon::end_data_table_header_row()."\n";
        !           275:                 }
1.50      matthew   276:             }
1.2       matthew   277:         }
                    278:     }
1.64      www       279:     $Str .= &Apache::loncommon::end_data_table().&Apache::loncommon::end_scrollbox()."\n";
1.2       matthew   280:     return $Str;
                    281: }
                    282: 
                    283: ####################################################
                    284: ####################################################
                    285: 
                    286: =pod
                    287: 
1.24      matthew   288: =item &MultipleProblemSelector($navmap,$selected,$inputname)
1.21      matthew   289: 
                    290: Generate HTML with checkboxes for problem selection.
                    291: 
                    292: Input: 
                    293: 
                    294: $navmap: a navmap object.  If undef, navmaps will be called to create a
                    295: new object.
                    296: 
                    297: $selected: Scalar, Array, or hash reference of currently selected items.
                    298: 
                    299: $inputname: The name of the form elements to use for the checkboxs.
                    300: 
                    301: Returns: A string containing html for a table which lists the sequences
                    302: and their contents.  A checkbox is provided for each problem.
                    303: 
                    304: =cut
                    305: 
                    306: ####################################################
                    307: ####################################################
                    308: sub MultipleProblemSelector {
1.63      raeburn   309:     my ($navmap,$inputname,$formname,$anoncounter)=@_;
1.46      albertel  310:     my $cid = $env{'request.course.id'};
1.21      matthew   311:     my $Str;
                    312:     # Massage the input as needed.
                    313:     if (! defined($navmap)) {
                    314:         $navmap = Apache::lonnavmaps::navmap->new();
                    315:         if (! defined($navmap)) {
1.56      bisitz    316:             $Str .= '<div class="LC_error">'
                    317:                    .&mt('Error: cannot process course structure')
                    318:                    .'</div>';
1.21      matthew   319:             return $Str;
                    320:         }
                    321:     }
                    322:     my $selected = {map { ($_,1) } (&get_selected_symbs($inputname))};
                    323:     # Header
                    324:     $Str .= <<"END";
1.58      bisitz    325: <script type="text/javascript" language="JavaScript">
1.25      matthew   326:     function checkall(value,seqid) {
1.21      matthew   327:         for (i=0; i<document.forms.$formname.elements.length; i++) {
                    328:             ele = document.forms.$formname.elements[i];
                    329:             if (ele.name == '$inputname') {
1.25      matthew   330:                 if (seqid != null) {
                    331:                     itemid = document.forms.$formname.elements[i].id;
                    332:                     thing = itemid.split(':');
                    333:                     if (thing[0] == seqid) {
                    334:                         document.forms.$formname.elements[i].checked=value;
                    335:                     }
                    336:                 } else {
                    337:                     document.forms.$formname.elements[i].checked=value;
                    338:                 }
1.21      matthew   339:             }
                    340:         }
                    341:     }
                    342: </script>
                    343: END
1.63      raeburn   344:     my $checkanonjs = <<"END";
                    345:  
                    346: <script type="text/javascript" language="JavaScript">
                    347:     function checkanon() {
                    348:         return true;
                    349:     }
                    350: </script>
                    351: 
                    352: END
                    353:     if (ref($anoncounter) eq 'HASH') {
                    354:         if (keys(%{$anoncounter}) > 0) {
1.74      damieng   355:             my $anonwarning = &mt('Your selection includes both problems with and without anonymous submissions.')."\n".&mt('You must select either only anonymous or only named problems.')."\n\n".&mt('If a selection contains both anonymous and named parts,[_1]use the Anonymous/Named buttons to ensure selections will be either all anonymous[_1]or all named.',"\n");
                    356:             &js_escape(\$anonwarning);
1.63      raeburn   357:             $checkanonjs = <<"END";
                    358: 
                    359: <script type="text/javascript" language="JavaScript">
                    360:     function checkanon() {
                    361:         anoncount = 0;
                    362:         namedcount = 0;
                    363:         for (i=0; i<document.forms.$formname.elements.length; i++) {
                    364:             ele = document.forms.$formname.elements[i];
                    365:             if (ele.name == '$inputname') {
                    366:                 itemid = document.forms.$formname.elements[i].id;
                    367:                 if (document.forms.$formname.elements[i].checked) {
                    368:                     anonid = 'anonymous_'+itemid;
                    369:                     mixid = 'mixed_'+itemid;
                    370:                     anonele = document.getElementById(anonid);
                    371:                     mixele = document.getElementById(mixid);
                    372:                     if (anonele.value > 0) {
                    373:                         if (mixele.value == 'none') {
                    374:                             anoncount ++;
                    375:                         } else {
                    376:                             if (mixele.value == '0') {
                    377:                                 if (mixele.checked) {
                    378:                                     anoncount ++; 
                    379:                                 } else {
                    380:                                     namedcount ++;
                    381:                                 } 
                    382:                             } else {
                    383:                                 namedcount ++;
                    384:                             }
                    385:                         }
                    386:                     } else {
                    387:                         namedcount ++;
                    388:                     }
                    389:                 }
                    390:             }
                    391:         }
                    392:         if (anoncount > 0 && namedcount > 0) {
                    393:             alert("$anonwarning");
                    394:             return false;
                    395:         } 
                    396:     }
                    397: </script>
                    398: 
                    399: END
                    400:         }
                    401:     }
                    402:     $Str .= $checkanonjs.
1.21      matthew   403:         '<a href="javascript:checkall(true)">'.&mt('Select All').'</a>'.
                    404:         ('&nbsp;'x4).
                    405:         '<a href="javascript:checkall(false)">'.&mt('Unselect All').'</a>';
                    406:     $Str .= $/.'<table>'.$/;
                    407:     my $iterator = $navmap->getIterator(undef, undef, undef, 1);
                    408:     my $sequence_string;
1.25      matthew   409:     my $seq_id = 0;
1.46      albertel  410:     my @Accumulator = (&new_accumulator($env{'course.'.$cid.'.description'},
1.21      matthew   411:                                         '',
                    412:                                         '',
1.25      matthew   413:                                         $seq_id++,
1.21      matthew   414:                                         $inputname));
                    415:     my @Sequence_Data;
                    416:     while (my $curRes = $iterator->next()) {
                    417:         if ($curRes == $iterator->END_MAP) {
                    418:             if (ref($Accumulator[-1]) eq 'CODE') {
1.24      matthew   419:                 my $old_accumulator = pop(@Accumulator);
                    420:                 push(@Sequence_Data,&{$old_accumulator}());
1.21      matthew   421:             }
                    422:         } elsif ($curRes == $iterator->BEGIN_MAP) {
                    423:             # Not much to do here.
                    424:         }
                    425:         next if (! ref($curRes));
                    426:         if ($curRes->is_map) {
1.24      matthew   427:             push(@Accumulator,&new_accumulator($curRes->compTitle,
1.21      matthew   428:                                                $curRes->src,
                    429:                                                $curRes->symb,
1.25      matthew   430:                                                $seq_id++,
1.21      matthew   431:                                                $inputname));
                    432:         } elsif ($curRes->is_problem) {
1.63      raeburn   433:             my $anonpart = 0;
                    434:             my $namedpart = 0;
                    435:             my @parts = @{$curRes->parts()};
                    436:             if (ref($anoncounter) eq 'HASH') {
                    437:                 if (keys(%{$anoncounter}) > 0) {
                    438:                     my @parts = @{$curRes->parts()};
                    439:                     my $symb = $curRes->symb();
                    440:                     foreach my $part (@parts) {
                    441:                         if ((exists($anoncounter->{$symb."\0".$part})) ||
                    442:                             $curRes->is_anonsurvey($part)) {
                    443:                             $anonpart ++;
                    444:                         } else {
                    445:                             $namedpart ++ 
                    446:                         }
                    447:                     }
                    448:                 }
                    449:             }
1.21      matthew   450:             if (@Accumulator && $Accumulator[-1] ne '') {
                    451:                 &{$Accumulator[-1]}($curRes,
1.63      raeburn   452:                                     exists($selected->{$curRes->symb}),
                    453:                                     $anonpart,$namedpart);
1.21      matthew   454:             }
                    455:         }
                    456:     }
                    457:     my $course_seq = pop(@Sequence_Data);
                    458:     foreach my $seq ($course_seq,@Sequence_Data) {
                    459:         #my $seq = pop(@Sequence_Data);
                    460:         next if (! defined($seq) || ref($seq) ne 'HASH');
                    461:         $Str.= '<tr><td colspan="2">'.
1.25      matthew   462:             '<b>'.$seq->{'title'}.'</b>'.('&nbsp;'x2).
                    463:             '<a href="javascript:checkall(true,'.$seq->{'id'}.')">'.
                    464:                                   &mt('Select').'</a>'.('&nbsp;'x2).
                    465:             '<a href="javascript:checkall(false,'.$seq->{'id'}.')">'.
                    466:                                   &mt('Unselect').'</a>'.('&nbsp;'x2).
1.21      matthew   467:             '</td></tr>'.$/;
                    468:         $Str.= $seq->{'html'};
                    469:     }
                    470:     $Str .= '</table>'.$/;
                    471:     return $Str;
                    472: }
                    473: 
                    474: sub new_accumulator {
1.25      matthew   475:     my ($title,$src,$symb,$seq_id,$inputname) = @_;
1.21      matthew   476:     my $target;
1.25      matthew   477:     my $item_id=0;
1.21      matthew   478:     return 
                    479:         sub {
                    480:             if (@_) { 
1.63      raeburn   481:                 my ($res,$checked,$anonpart,$namedpart) = @_;
1.23      matthew   482:                 $target.='<tr><td><label>'.
1.21      matthew   483:                     '<input type="checkbox" name="'.$inputname.'" ';
                    484:                 if ($checked) {
1.56      bisitz    485:                     $target .= 'checked="checked" ';
1.21      matthew   486:                 }
1.63      raeburn   487:                 my $anon_id = $item_id;
1.25      matthew   488:                 $target .= 'id="'.$seq_id.':'.$item_id++.'" ';
1.63      raeburn   489:                 my $esc_symb = &escape($res->symb);
1.21      matthew   490:                 $target.= 
1.63      raeburn   491:                     'value="'.$esc_symb.'" />'.
1.26      matthew   492:                     '&nbsp;'.$res->compTitle.'</label>'.
                    493:                     ('&nbsp;'x2).'<a target="preview" '.
1.55      raeburn   494:                     'href="'.$res->link.'?symb='.
1.56      bisitz    495:                     &escape($res->shown_symb).'">'.&mt('view').'</a>'.
1.63      raeburn   496:                     '<input type="hidden" id="anonymous_'.$seq_id.':'.$anon_id.'" name="hidden_'.$seq_id.':'.$anon_id.'" value="'.$anonpart.'" />';
                    497:                 my $mixed = '<input type="hidden" id="mixed_'.$seq_id.':'.$anon_id.'" value="none" name="mixed_'.$seq_id.':'.$anon_id.'" />';
                    498:                 if ($anonpart) {
                    499:                     if ($namedpart) {
                    500:                         my $checknamed = '';
                    501:                         my $checkedanon = ' checked="checked"';
                    502:                         if ($env{'form.mixed_'.$seq_id.':'.$anon_id} eq $esc_symb) {
                    503:                             $checknamed = $checkedanon;
                    504:                             $checkedanon = '';
                    505:                         }
                    506:                         $mixed = '&nbsp;('.
                    507:     &mt('Both anonymous and named submissions -- display: [_1]Anonymous [_2]Named[_3]',
                    508:     '<span class="LC_nobreak"><label>'.
                    509:     '<input type="radio" name="mixed_'.$seq_id.':'.$anon_id.
                    510:     '" value="0" id="mixed_'.$seq_id.':'.$anon_id.'"'.$checkedanon.' />',
                    511:     '</label></span>'.('&nbsp;'x2).' <span class="LC_nobreak">'.
                    512:     '<label><input type="radio" name="mixed_'.$seq_id.':'.$anon_id.
                    513:     '" value="symb_'.$esc_symb.'" id="named_'.$seq_id.':'.$anon_id.'"'.$checknamed.' />',
                    514:     '</label></span>').')';
                    515:                     } else {
                    516:                         $target .= '&nbsp;'.&mt('(Anonymous Survey)');
                    517:                     }
                    518:                 }
                    519:                 $target.= $mixed.'</td></tr>'.$/;
1.21      matthew   520:             } else { 
                    521:                 if (defined($target)) {
                    522:                     return { title => $title,
                    523:                              symb  => $symb,
                    524:                              src   => $src,
1.25      matthew   525:                              id    => $seq_id,
1.21      matthew   526:                              html  => $target, }; 
                    527:                 }
                    528:                 return undef;
                    529:             }
                    530:         };
                    531: }
                    532: 
                    533: sub get_selected_symbs {
                    534:     my ($inputfield) = @_;
                    535:     my $field = 'form.'.$inputfield;
1.48      matthew   536:     my @symbs = (map {
1.53      www       537:                      &unescape($_);
1.48      matthew   538:                      } &Apache::loncommon::get_env_multiple($field));
                    539:     return @symbs;
1.21      matthew   540: }
                    541: 
                    542: ####################################################
                    543: ####################################################
                    544: 
                    545: =pod
                    546: 
1.2       matthew   547: =item &make_target_id($target)
                    548: 
                    549: Inputs: Hash ref with the following entries:
                    550:     $target->{'symb'}, $target->{'part'}, $target->{'respid'}, 
                    551:     $target->{'resptype'}.
                    552: 
                    553: Returns: A string, suitable for a form parameter, which uniquely identifies
                    554: the problem, part, and response to do statistical analysis on.
                    555: 
                    556: Used by Apache::lonstathelpers::ProblemSelector().
                    557: 
                    558: =cut
                    559: 
                    560: ####################################################
                    561: ####################################################
                    562: sub make_target_id {
                    563:     my ($target) = @_;
1.53      www       564:     my $id = &escape($target->{'symb'}).':'.
                    565:              &escape($target->{'part'}).':'.
                    566:              &escape($target->{'respid'}).':'.
                    567:              &escape($target->{'resptype'});
1.2       matthew   568:     return $id;
                    569: }
                    570: 
                    571: ####################################################
                    572: ####################################################
                    573: 
                    574: =pod
                    575: 
                    576: =item &get_target_from_id($id)
                    577: 
                    578: Inputs: $id, a scalar string from Apache::lonstathelpers::make_target_id().
                    579: 
                    580: Returns: A hash reference, $target, containing the following keys:
                    581:     $target->{'symb'}, $target->{'part'}, $target->{'respid'}, 
                    582:     $target->{'resptype'}.
                    583: 
                    584: =cut
                    585: 
                    586: ####################################################
                    587: ####################################################
                    588: sub get_target_from_id {
                    589:     my ($id) = @_;
1.21      matthew   590:     if (! ref($id)) {
                    591:         my ($symb,$part,$respid,$resptype) = split(':',$id);
1.53      www       592:         return ({ symb     => &unescape($symb),
                    593:                   part     => &unescape($part),
                    594:                   respid   => &unescape($respid),
                    595:                   resptype => &unescape($resptype)});
1.21      matthew   596:     } elsif (ref($id) eq 'ARRAY') {
                    597:         my @Return;
                    598:         foreach my $selected (@$id) {
                    599:             my ($symb,$part,$respid,$resptype) = split(':',$selected);
1.53      www       600:             push(@Return,{ symb     => &unescape($symb),
                    601:                            part     => &unescape($part),
                    602:                            respid   => &unescape($respid),
                    603:                            resptype => &unescape($resptype)});
1.21      matthew   604:         }
                    605:         return \@Return;
                    606:     }
1.2       matthew   607: }
                    608: 
                    609: ####################################################
                    610: ####################################################
                    611: 
                    612: =pod
                    613: 
1.13      matthew   614: =item &get_prev_curr_next($target,$AcceptableResponseTypes,$granularity)
1.2       matthew   615: 
                    616: Determine the problem parts or responses preceeding and following the
                    617: current resource.
                    618: 
                    619: Inputs: $target (see &Apache::lonstathelpers::get_target_from_id())
                    620:   $AcceptableResponseTypes, regular expression matching acceptable
                    621:                             response types,
1.52      albertel  622:   $granularity, either 'part', 'response', 'part_survey', or 'part_task'
1.2       matthew   623: 
                    624: Returns: three hash references, $prev, $curr, $next, which refer to the
                    625: preceeding, current, or following problem parts or responses, depending
                    626: on the value of $granularity.  Values of undef indicate there is no
                    627: previous or next part/response.  A value of undef for all three indicates
                    628: there was no match found to the current part/resource.
                    629: 
                    630: The hash references contain the following keys:
                    631:     symb, part, resource
                    632: 
                    633: If $granularity eq 'response', the following ADDITIONAL keys will be present:
                    634:     respid, resptype
                    635: 
                    636: =cut
                    637: 
                    638: ####################################################
                    639: ####################################################
                    640: sub get_prev_curr_next {
                    641:     my ($target,$AcceptableResponseTypes,$granularity) = @_;
                    642:     #
                    643:     # Build an array with the data we need to search through
                    644:     my @Resource;
1.40      matthew   645:     my ($navmap,@sequences) = 
                    646:         &Apache::lonstatistics::selected_sequences_with_assessments('all');
                    647:     return $navmap if (! ref($navmap));
                    648:     foreach my $seq (@sequences) {
                    649:         my @resources = &get_resources($navmap,$seq);
                    650:         foreach my $res (@resources) {
                    651:             foreach my $part (@{$res->parts}) {
1.60      raeburn   652:                 if (($res->is_survey($part) || ($res->is_anonsurvey($part))) && 
                    653:                     ($granularity eq 'part_survey')) {
1.20      matthew   654:                     push (@Resource,
1.40      matthew   655:                           { symb     => $res->symb,
1.20      matthew   656:                             part     => $part,
                    657:                             resource => $res,
                    658:                         } );
1.52      albertel  659: 		} elsif ($res->is_task($part) && ($granularity eq 'part_task')){
                    660:                     push (@Resource,
                    661:                           { symb     => $res->symb,
                    662:                             part     => $part,
                    663:                             resource => $res,
                    664:                         } );
1.13      matthew   665:                 } elsif ($granularity eq 'part') {
1.2       matthew   666:                     push (@Resource,
1.40      matthew   667:                           { symb     => $res->symb,
1.2       matthew   668:                             part     => $part,
                    669:                             resource => $res,
                    670:                         } );
                    671:                 } elsif ($granularity eq 'response') {
1.40      matthew   672:                     my @response_ids   = $res->responseIds($part);
                    673:                     my @response_types = $res->responseType($part);
1.2       matthew   674:                     for (my $i=0;
1.40      matthew   675:                          $i<scalar(@response_ids);
1.2       matthew   676:                          $i++){
1.40      matthew   677:                         my $respid   = $response_ids[$i];
                    678:                         my $resptype = $response_types[$i];
1.2       matthew   679:                         next if ($resptype !~ m/$AcceptableResponseTypes/);
                    680:                         push (@Resource,
1.40      matthew   681:                               { symb     => $res->symb,
1.2       matthew   682:                                 part     => $part,
1.40      matthew   683:                                 respid   => $respid,
                    684:                                 resptype => $resptype,
1.2       matthew   685:                                 resource => $res,
                    686:                                 } );
                    687:                     }
                    688:                 }
                    689:             }
                    690:         }
                    691:     }
                    692:     #
                    693:     # Get the index of the current situation
                    694:     my $curr_idx;
                    695:     for ($curr_idx=0;$curr_idx<$#Resource;$curr_idx++) {
                    696:         my $curr_item = $Resource[$curr_idx];
1.52      albertel  697:         if ($granularity =~ /^(part|part_survey|part_task)$/) {
1.2       matthew   698:             if ($curr_item->{'symb'} eq $target->{'symb'} &&
                    699:                 $curr_item->{'part'} eq $target->{'part'}) {
                    700:                 last;
                    701:             }
                    702:         } elsif ($granularity eq 'response') {
                    703:             if ($curr_item->{'symb'} eq $target->{'symb'} &&
                    704:                 $curr_item->{'part'} eq $target->{'part'} &&
                    705:                 $curr_item->{'respid'} eq $target->{'respid'} &&
                    706:                 $curr_item->{'resptype'} eq $target->{'resptype'}) {
                    707:                 last;
                    708:             }
                    709:         }
                    710:     }
                    711:     my $curr_item = $Resource[$curr_idx];
1.52      albertel  712:     if ($granularity =~ /^(part|part_survey|part_task)$/) {
1.2       matthew   713:         if ($curr_item->{'symb'}     ne $target->{'symb'} ||
                    714:             $curr_item->{'part'}     ne $target->{'part'}) {
                    715:             # bogus symb - return nothing
                    716:             return (undef,undef,undef);
                    717:         }
                    718:     } elsif ($granularity eq 'response') {
                    719:         if ($curr_item->{'symb'}     ne $target->{'symb'} ||
                    720:             $curr_item->{'part'}     ne $target->{'part'} ||
                    721:             $curr_item->{'respid'}   ne $target->{'respid'} ||
                    722:             $curr_item->{'resptype'} ne $target->{'resptype'}){
                    723:             # bogus symb - return nothing
                    724:             return (undef,undef,undef);
                    725:         }
                    726:     }
                    727:     #
                    728:     # Now just pick up the data we need
                    729:     my ($prev,$curr,$next);
                    730:     if ($curr_idx == 0) {
                    731:         $prev = undef;
                    732:         $curr = $Resource[$curr_idx  ];
                    733:         $next = $Resource[$curr_idx+1];
                    734:     } elsif ($curr_idx == $#Resource) {
                    735:         $prev = $Resource[$curr_idx-1];
                    736:         $curr = $Resource[$curr_idx  ];
                    737:         $next = undef;
                    738:     } else {
                    739:         $prev = $Resource[$curr_idx-1];
                    740:         $curr = $Resource[$curr_idx  ];
                    741:         $next = $Resource[$curr_idx+1];
                    742:     }
1.40      matthew   743:     return ($navmap,$prev,$curr,$next);
1.4       matthew   744: }
                    745: 
1.9       matthew   746: 
                    747: #####################################################
                    748: #####################################################
                    749: 
                    750: =pod
                    751: 
                    752: =item GetStudentAnswers($r,$problem,$Students)
                    753: 
                    754: Determines the correct answer for a set of students on a given problem.
                    755: The students answers are stored in the student hashes pointed to by the
                    756: array @$Students under the key 'answer'.
                    757: 
                    758: Inputs: $r
                    759: $problem: hash reference containing the keys 'resource', 'part', and 'respid'.
                    760: $Students: reference to array containing student hashes (need 'username', 
                    761:     'domain').  
                    762: 
                    763: Returns: nothing 
                    764: 
                    765: =cut
                    766: 
                    767: #####################################################
                    768: #####################################################
                    769: sub GetStudentAnswers {
1.12      matthew   770:     my ($r,$problem,$Students,$formname,$inputname) = @_;
1.31      matthew   771:     my %answers;
1.12      matthew   772:     my $status_type;
                    773:     if (defined($formname)) {
                    774:         $status_type = 'inline';
                    775:     } else {
                    776:         $status_type = 'popup';
                    777:     }    
1.9       matthew   778:     my $c = $r->connection();
                    779:     my %Answers;
                    780:     my ($resource,$partid,$respid) = ($problem->{'resource'},
                    781:                                       $problem->{'part'},
                    782:                                       $problem->{'respid'});
                    783:     # Read in the cache (if it exists) before we start timing things.
                    784:     &Apache::lonstathelpers::ensure_proper_cache($resource->{'symb'});
                    785:     # Open progress window
1.68      www       786:     my %prog_state=&Apache::lonhtmlcommon::Create_PrgWin($r,scalar(@$Students));
1.9       matthew   787:     $r->rflush();
                    788:     foreach my $student (@$Students) {
                    789:         last if ($c->aborted());
                    790:         my $sname = $student->{'username'};
                    791:         my $sdom = $student->{'domain'};
1.30      matthew   792:         my $answer = &Apache::lonstathelpers::get_student_answer
1.9       matthew   793:             ($resource,$sname,$sdom,$partid,$respid);
                    794:         &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state,
1.62      bisitz    795:                                                      'last student');
1.31      matthew   796:         $answers{$answer}++;
1.9       matthew   797:         $student->{'answer'} = $answer;
                    798:     }
1.29      matthew   799:     &Apache::lonstathelpers::write_analysis_cache();
1.9       matthew   800:     return if ($c->aborted());
                    801:     $r->rflush();
                    802:     # close progress window
                    803:     &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
1.31      matthew   804:     return \%answers;
1.9       matthew   805: }
1.4       matthew   806: 
                    807: #####################################################
                    808: #####################################################
                    809: 
                    810: =pod
                    811: 
                    812: =item analyze_problem_as_student
                    813: 
1.30      matthew   814: Analyzes a homework problem for a student
1.4       matthew   815: 
                    816: Inputs: $resource: a resource object
                    817:         $sname, $sdom, $partid, $respid
                    818: 
1.30      matthew   819: Returns: the problem analysis hash
1.6       matthew   820: 
1.4       matthew   821: =cut
                    822: 
                    823: #####################################################
                    824: #####################################################
                    825: sub analyze_problem_as_student {
1.30      matthew   826:     my ($resource,$sname,$sdom) = @_;
1.22      matthew   827:     if (ref($resource) ne 'HASH') {
                    828:         my $res = $resource;
                    829:         $resource = { 'src' => $res->src,
                    830:                       'symb' => $res->symb,
                    831:                       'parts' => $res->parts };
                    832:         foreach my $part (@{$resource->{'parts'}}) {
                    833:             $resource->{'partdata'}->{$part}->{'ResponseIds'}=
                    834:                 [$res->responseIds($part)];
                    835:         }
                    836:     }
1.4       matthew   837:     my $url = $resource->{'src'};
                    838:     my $symb = $resource->{'symb'};
1.29      matthew   839:     my $analysis = &get_from_analysis_cache($sname,$sdom,$symb);
                    840:     if (! defined($analysis)) {
1.46      albertel  841:         my $courseid = $env{'request.course.id'};
1.29      matthew   842:         my $Answ=&Apache::lonnet::ssi($url,('grade_target' => 'analyze',
                    843:                                             'grade_domain' => $sdom,
                    844:                                             'grade_username' => $sname,
                    845:                                             'grade_symb' => $symb,
                    846:                                             'grade_courseid' => $courseid));
                    847:         (my $garbage,$analysis)=split(/_HASH_REF__/,$Answ,2);
                    848:         &store_analysis($sname,$sdom,$symb,$analysis);
                    849:     }
                    850:     my %Answer=&Apache::lonnet::str2hash($analysis);
1.6       matthew   851:     #
1.30      matthew   852:     return \%Answer;
                    853: }
                    854: 
                    855: #####################################################
                    856: #####################################################
                    857: 
                    858: =pod
                    859: 
                    860: =item get_student_answer
                    861: 
                    862: Analyzes a homework problem for a particular student and returns the correct 
                    863: answer.  Attempts to put together an answer for problem types 
                    864: that do not natively support it.
                    865: 
                    866: Inputs: $resource: a resource object (from navmaps or hash from loncoursedata)
                    867:         $sname, $sdom, $partid, $respid
                    868: 
                    869: Returns: $answer
                    870: 
                    871: If $partid and $respid are specified, $answer is simply a scalar containing
                    872: the correct answer for the response.
                    873: 
                    874: If $partid or $respid are undefined, $answer will be a hash reference with
                    875: keys $partid.'.'.$respid.'.answer'.
                    876: 
                    877: =cut
                    878: 
                    879: #####################################################
                    880: #####################################################
                    881: sub get_student_answer {
                    882:     my ($resource,$sname,$sdom,$partid,$respid) = @_;
                    883:     #
                    884:     if (ref($resource) ne 'HASH') {
                    885:         my $res = $resource;
                    886:         $resource = { 'src' => $res->src,
                    887:                       'symb' => $res->symb,
                    888:                       'parts' => $res->parts };
                    889:         foreach my $part (@{$resource->{'parts'}}) {
                    890:             $resource->{'partdata'}->{$part}->{'ResponseIds'}=
                    891:                 [$res->responseIds($part)];
                    892:         }
                    893:     }
                    894:     #
                    895:     my $analysis = 
                    896:         &analyze_problem_as_student($resource,$sname,$sdom);
1.29      matthew   897:     my $answer;
1.8       matthew   898:     foreach my $partid (@{$resource->{'parts'}}) {
1.6       matthew   899:         my $partdata = $resource->{'partdata'}->{$partid};
                    900:         foreach my $respid (@{$partdata->{'ResponseIds'}}) {
                    901:             my $prefix = $partid.'.'.$respid;
                    902:             my $key = $prefix.'.answer';
1.30      matthew   903:             $answer->{$partid}->{$respid} = 
                    904:                 &get_answer($prefix,$key,%$analysis);
1.6       matthew   905:         }
1.8       matthew   906:     }
1.30      matthew   907:     my $returnvalue;
1.8       matthew   908:     if (! defined($partid)) {
                    909:         $returnvalue = $answer;
                    910:     } elsif (! defined($respid)) {
                    911:         $returnvalue = $answer->{$partid};
1.6       matthew   912:     } else {
1.8       matthew   913:         $returnvalue = $answer->{$partid}->{$respid};
1.6       matthew   914:     }
                    915:     return $returnvalue;
                    916: }
                    917: 
                    918: sub get_answer {
                    919:     my ($prefix,$key,%Answer) = @_;
                    920:     my $returnvalue;
1.4       matthew   921:     if (exists($Answer{$key})) {
1.54      albertel  922: 	if (ref($Answer{$key}) eq 'HASH') {
                    923: 	    my $which = 'INTERNAL';
                    924: 	    if (!exists($Answer{$key}{$which})) {
                    925: 		$which = (sort(keys(%{ $Answer{$key} })))[0];
                    926: 	    }
                    927: 	    my $student_answer = $Answer{$key}{$which}[0][0];
                    928: 	    $returnvalue = $student_answer; 
                    929: 	} else {
                    930: 	    &Apache::lonnet::logthis("error analyzing problem. got a answer of type ".ref($Answer{$key}));
                    931: 	}
1.4       matthew   932:     } else {
                    933:         if (exists($Answer{$prefix.'.shown'})) {
                    934:             # The response has foils
                    935:             my %values;
                    936:             while (my ($k,$v) = each(%Answer)) {
                    937:                 next if ($k !~ /^$prefix\.foil\.(value|area)\.(.*)$/);
                    938:                 my $foilname = $2;
                    939:                 $values{$foilname}=$v;
                    940:             }
                    941:             foreach my $foil (@{$Answer{$prefix.'.shown'}}) {
                    942:                 if (ref($values{$foil}) eq 'ARRAY') {
1.10      albertel  943:                     $returnvalue.=&HTML::Entities::encode($foil,'<>&"').'='.
                    944:                         join(',',map {&HTML::Entities::encode($_,'<>&"')} @{$values{$foil}}).'&';
1.4       matthew   945:                 } else {
1.10      albertel  946:                     $returnvalue.=&HTML::Entities::encode($foil,'<>&"').'='.
                    947:                         &HTML::Entities::encode($values{$foil},'<>&"').'&';
1.4       matthew   948:                 }
                    949:             }
                    950:             $returnvalue =~ s/ /\%20/g;
                    951:             chop ($returnvalue);
                    952:         }
                    953:     }
                    954:     return $returnvalue;
                    955: }
1.8       matthew   956: 
                    957: #####################################################
                    958: #####################################################
                    959: 
                    960: =pod
                    961: 
                    962: =item Caching routines
                    963: 
                    964: =over 4
                    965: 
1.29      matthew   966: =item &load_analysis_cache($symb)
1.8       matthew   967: 
                    968: Loads the cache for the given symb into memory from disk.  
                    969: Requires the cache filename be set.  
                    970: Only should be called by &ensure_proper_cache.
                    971: 
                    972: =cut
                    973: 
                    974: #####################################################
                    975: #####################################################
                    976: {
                    977:     my $cache_filename = undef;
                    978:     my $current_symb = undef;
                    979:     my %cache;
                    980: 
1.29      matthew   981: sub load_analysis_cache {
1.8       matthew   982:     my ($symb) = @_;
                    983:     return if (! defined($cache_filename));
                    984:     if (! defined($current_symb) || $current_symb ne $symb) {
                    985:         undef(%cache);
                    986:         my $storedstring;
                    987:         my %cache_db;
                    988:         if (tie(%cache_db,'GDBM_File',$cache_filename,&GDBM_READER(),0640)) {
1.53      www       989:             $storedstring = $cache_db{&escape($symb)};
1.8       matthew   990:             untie(%cache_db);
                    991:         }
                    992:         if (defined($storedstring)) {
                    993:             %cache = %{thaw($storedstring)};
                    994:         }
                    995:     }
                    996:     return;
                    997: }
                    998: 
                    999: #####################################################
                   1000: #####################################################
                   1001: 
                   1002: =pod
                   1003: 
1.29      matthew  1004: =item &get_from_analysis_cache($sname,$sdom,$symb,$partid,$respid)
1.8       matthew  1005: 
                   1006: Returns the appropriate data from the cache, or undef if no data exists.
                   1007: 
                   1008: =cut
                   1009: 
                   1010: #####################################################
                   1011: #####################################################
1.29      matthew  1012: sub get_from_analysis_cache {
                   1013:     my ($sname,$sdom,$symb) = @_;
1.8       matthew  1014:     &ensure_proper_cache($symb);
                   1015:     my $returnvalue;
1.29      matthew  1016:     if (exists($cache{$sname.':'.$sdom})) {
                   1017:         $returnvalue = $cache{$sname.':'.$sdom};
1.8       matthew  1018:     } else {
                   1019:         $returnvalue = undef;
                   1020:     }
                   1021:     return $returnvalue;
                   1022: }
                   1023: 
                   1024: #####################################################
                   1025: #####################################################
                   1026: 
                   1027: =pod
                   1028: 
1.29      matthew  1029: =item &write_analysis_cache($symb)
1.8       matthew  1030: 
                   1031: Writes the in memory cache to disk so that it can be read in with
1.29      matthew  1032: &load_analysis_cache($symb).
1.8       matthew  1033: 
                   1034: =cut
                   1035: 
                   1036: #####################################################
                   1037: #####################################################
1.29      matthew  1038: sub write_analysis_cache {
1.8       matthew  1039:     return if (! defined($current_symb) || ! defined($cache_filename));
                   1040:     my %cache_db;
1.53      www      1041:     my $key = &escape($current_symb);
1.8       matthew  1042:     if (tie(%cache_db,'GDBM_File',$cache_filename,&GDBM_WRCREAT(),0640)) {
                   1043:         my $storestring = freeze(\%cache);
                   1044:         $cache_db{$key}=$storestring;
                   1045:         $cache_db{$key.'.time'}=time;
                   1046:         untie(%cache_db);
                   1047:     }
                   1048:     undef(%cache);
                   1049:     undef($current_symb);
                   1050:     undef($cache_filename);
                   1051:     return;
                   1052: }
                   1053: 
                   1054: #####################################################
                   1055: #####################################################
                   1056: 
                   1057: =pod
                   1058: 
                   1059: =item &ensure_proper_cache($symb)
                   1060: 
                   1061: Called to make sure we have the proper cache set up.  This is called
1.29      matthew  1062: prior to every analysis lookup.
1.8       matthew  1063: 
                   1064: =cut
                   1065: 
                   1066: #####################################################
                   1067: #####################################################
                   1068: sub ensure_proper_cache {
                   1069:     my ($symb) = @_;
1.46      albertel 1070:     my $cid = $env{'request.course.id'};
1.67      foxr     1071:     my $new_filename = LONCAPA::tempdir() .
1.29      matthew  1072:         'problemanalysis_'.$cid.'_analysis_cache.db';
1.8       matthew  1073:     if (! defined($cache_filename) ||
                   1074:         $cache_filename ne $new_filename ||
                   1075:         ! defined($current_symb)   ||
                   1076:         $current_symb ne $symb) {
                   1077:         $cache_filename = $new_filename;
                   1078:         # Notice: $current_symb is not set to $symb until after the cache is
1.29      matthew  1079:         # loaded.  This is what tells &load_analysis_cache to load in a new
1.8       matthew  1080:         # symb cache.
1.29      matthew  1081:         &load_analysis_cache($symb);
1.8       matthew  1082:         $current_symb = $symb;
                   1083:     }
                   1084: }
                   1085: 
                   1086: #####################################################
                   1087: #####################################################
                   1088: 
                   1089: =pod
                   1090: 
1.29      matthew  1091: =item &store_analysis($sname,$sdom,$symb,$partid,$respid,$dataset)
1.8       matthew  1092: 
1.29      matthew  1093: Stores the analysis data in the in memory cache.
1.8       matthew  1094: 
                   1095: =cut
                   1096: 
                   1097: #####################################################
                   1098: #####################################################
1.29      matthew  1099: sub store_analysis {
                   1100:     my ($sname,$sdom,$symb,$dataset) = @_;
1.8       matthew  1101:     return if ($symb ne $current_symb);
1.29      matthew  1102:     $cache{$sname.':'.$sdom}=$dataset;
1.8       matthew  1103:     return;
                   1104: }
                   1105: 
                   1106: }
                   1107: #####################################################
                   1108: #####################################################
                   1109: 
                   1110: =pod
                   1111: 
                   1112: =back
                   1113: 
                   1114: =cut
                   1115: 
                   1116: #####################################################
                   1117: #####################################################
1.4       matthew  1118: 
                   1119: ##
                   1120: ## The following is copied from datecalc1.pl, part of the 
                   1121: ## Spreadsheet::WriteExcel CPAN module.
                   1122: ##
                   1123: ##
                   1124: ######################################################################
                   1125: #
                   1126: # Demonstration of writing date/time cells to Excel spreadsheets,
                   1127: # using UNIX/Perl time as source of date/time.
                   1128: #
                   1129: # Copyright 2000, Andrew Benham, adsb@bigfoot.com
                   1130: #
                   1131: ######################################################################
                   1132: #
                   1133: # UNIX/Perl time is the time since the Epoch (00:00:00 GMT, 1 Jan 1970)
                   1134: # measured in seconds.
                   1135: #
                   1136: # An Excel file can use exactly one of two different date/time systems.
                   1137: # In these systems, a floating point number represents the number of days
                   1138: # (and fractional parts of the day) since a start point. The floating point
                   1139: # number is referred to as a 'serial'.
                   1140: # The two systems ('1900' and '1904') use different starting points:
                   1141: #  '1900'; '1.00' is 1 Jan 1900 BUT 1900 is erroneously regarded as
                   1142: #          a leap year - see:
                   1143: #            http://support.microsoft.com/support/kb/articles/Q181/3/70.asp
                   1144: #          for the excuse^H^H^H^H^H^Hreason.
                   1145: #  '1904'; '1.00' is 2 Jan 1904.
                   1146: #
                   1147: # The '1904' system is the default for Apple Macs. Windows versions of
                   1148: # Excel have the option to use the '1904' system.
                   1149: #
                   1150: # Note that Visual Basic's "DateSerial" function does NOT erroneously
                   1151: # regard 1900 as a leap year, and thus its serials do not agree with
                   1152: # the 1900 serials of Excel for dates before 1 Mar 1900.
                   1153: #
                   1154: # Note that StarOffice (at least at version 5.2) does NOT erroneously
                   1155: # regard 1900 as a leap year, and thus its serials do not agree with
                   1156: # the 1900 serials of Excel for dates before 1 Mar 1900.
                   1157: #
                   1158: ######################################################################
                   1159: #
                   1160: # Calculation description
                   1161: # =======================
                   1162: #
                   1163: # 1900 system
                   1164: # -----------
                   1165: # Unix time is '0' at 00:00:00 GMT 1 Jan 1970, i.e. 70 years after 1 Jan 1900.
                   1166: # Of those 70 years, 17 (1904,08,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68)
                   1167: # were leap years with an extra day.
                   1168: # Thus there were 17 + 70*365 days = 25567 days between 1 Jan 1900 and
                   1169: # 1 Jan 1970.
                   1170: # In the 1900 system, '1' is 1 Jan 1900, but as 1900 was not a leap year
                   1171: # 1 Jan 1900 should really be '2', so 1 Jan 1970 is '25569'.
                   1172: #
                   1173: # 1904 system
                   1174: # -----------
                   1175: # Unix time is '0' at 00:00:00 GMT 1 Jan 1970, i.e. 66 years after 1 Jan 1904.
                   1176: # Of those 66 years, 17 (1904,08,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68)
                   1177: # were leap years with an extra day.
                   1178: # Thus there were 17 + 66*365 days = 24107 days between 1 Jan 1904 and
                   1179: # 1 Jan 1970.
                   1180: # In the 1904 system, 2 Jan 1904 being '1', 1 Jan 1970 is '24107'.
                   1181: #
                   1182: ######################################################################
                   1183: #
                   1184: # Copyright (c) 2000, Andrew Benham.
                   1185: # This program is free software. It may be used, redistributed and/or
                   1186: # modified under the same terms as Perl itself.
                   1187: #
                   1188: # Andrew Benham, adsb@bigfoot.com
                   1189: # London, United Kingdom
                   1190: # 11 Nov 2000
                   1191: #
                   1192: ######################################################################
                   1193: #-----------------------------------------------------------
                   1194: # calc_serial()
                   1195: #
                   1196: # Called with (up to) 2 parameters.
                   1197: #   1.  Unix timestamp.  If omitted, uses current time.
                   1198: #   2.  GMT flag. Set to '1' to return serial in GMT.
                   1199: #       If omitted, returns serial in appropriate timezone.
                   1200: #
                   1201: # Returns date/time serial according to $DATE_SYSTEM selected
                   1202: #-----------------------------------------------------------
                   1203: sub calc_serial {
                   1204:     # Use 1900 date system on all platforms other than Apple Mac (for which
                   1205:     # use 1904 date system).
                   1206:     my $DATE_SYSTEM = ($^O eq 'MacOS') ? 1 : 0;
                   1207:     my $time = (defined $_[0]) ? $_[0] : time();
                   1208:     my $gmtflag = (defined $_[1]) ? $_[1] : 0;
                   1209:     #
                   1210:     # Divide timestamp by number of seconds in a day.
                   1211:     # This gives a date serial with '0' on 1 Jan 1970.
                   1212:     my $serial = $time / 86400;
                   1213:     #
                   1214:     # Adjust the date serial by the offset appropriate to the
                   1215:     # currently selected system (1900/1904).
                   1216:     if ($DATE_SYSTEM == 0) {        # use 1900 system
                   1217:         $serial += 25569;
                   1218:     } else {                        # use 1904 system
                   1219:         $serial += 24107;
                   1220:     }
                   1221:     #
                   1222:     unless ($gmtflag) {
                   1223:         # Now have a 'raw' serial with the right offset. But this
                   1224:         # gives a serial in GMT, which is false unless the timezone
                   1225:         # is GMT. We need to adjust the serial by the appropriate
                   1226:         # timezone offset.
                   1227:         # Calculate the appropriate timezone offset by seeing what
                   1228:         # the differences between localtime and gmtime for the given
                   1229:         # time are.
                   1230:         #    
                   1231:         my @gmtime = gmtime($time);
                   1232:         my @ltime  = localtime($time);
                   1233:         #
                   1234:         # For the first 7 elements of the two arrays, adjust the
                   1235:         # date serial where the elements differ.
                   1236:         for (0 .. 6) {
                   1237:             my $diff = $ltime[$_] - $gmtime[$_];
                   1238:             if ($diff) {
                   1239:                 $serial += _adjustment($diff,$_);
                   1240:             }
                   1241:         }
                   1242:     }
                   1243:     #
                   1244:     # Perpetuate the error that 1900 was a leap year by decrementing
                   1245:     # the serial if we're using the 1900 system and the date is prior to
                   1246:     # 1 Mar 1900. This has the effect of making serial value '60'
                   1247:     # 29 Feb 1900.
                   1248:     #
                   1249:     # This fix only has any effect if UNIX/Perl time on the platform
                   1250:     # can represent 1900. Many can't.
                   1251:     #
                   1252:     unless ($DATE_SYSTEM) {
                   1253:         $serial-- if ($serial < 61);    # '61' is 1 Mar 1900
                   1254:     }
                   1255:     return $serial;
                   1256: }
                   1257: 
                   1258: sub _adjustment {
                   1259:     # Based on the difference in the localtime/gmtime array elements
                   1260:     # number, return the adjustment required to the serial.
                   1261:     #
                   1262:     # We only look at some elements of the localtime/gmtime arrays:
                   1263:     #    seconds    unlikely to be different as all known timezones
                   1264:     #               have an offset of integral multiples of 15 minutes,
                   1265:     #               but it's easy to do.
                   1266:     #    minutes    will be different for timezone offsets which are
                   1267:     #               not an exact number of hours.
                   1268:     #    hours      very likely to be different.
                   1269:     #    weekday    will differ when localtime/gmtime difference
                   1270:     #               straddles midnight.
                   1271:     #
                   1272:     # Assume that difference between localtime and gmtime is less than
                   1273:     # 5 days, then don't have to do maths for day of month, month number,
                   1274:     # year number, etc...
                   1275:     #
                   1276:     my ($delta,$element) = @_;
                   1277:     my $adjust = 0;
                   1278:     #
                   1279:     if ($element == 0) {            # Seconds
                   1280:         $adjust = $delta/86400;         # 60 * 60 * 24
                   1281:     } elsif ($element == 1) {       # Minutes
                   1282:         $adjust = $delta/1440;          # 60 * 24
                   1283:     } elsif ($element == 2) {       # Hours
                   1284:         $adjust = $delta/24;            # 24
                   1285:     } elsif ($element == 6) {       # Day of week number
                   1286:         # Catch difference straddling Sat/Sun in either direction
                   1287:         $delta += 7 if ($delta < -4);
                   1288:         $delta -= 7 if ($delta > 4);
                   1289:         #    
                   1290:         $adjust = $delta;
                   1291:     }
                   1292:     return $adjust;
                   1293: }
                   1294: 
                   1295: ###########################################################
                   1296: ###########################################################
                   1297: 
                   1298: =pod
                   1299: 
                   1300: =item get_problem_data
                   1301: 
                   1302: Returns a data structure describing the problem.
                   1303: 
                   1304: Inputs: $url
                   1305: 
                   1306: Returns: %Partdata
                   1307: 
                   1308: =cut
                   1309: 
                   1310: ## note: we must force each foil and option to not begin or end with
                   1311: ##       spaces as they are stored without such data.
                   1312: ##
                   1313: ###########################################################
                   1314: ###########################################################
                   1315: sub get_problem_data {
                   1316:     my ($url) = @_;
                   1317:     my $Answ=&Apache::lonnet::ssi($url,('grade_target' => 'analyze'));
                   1318:     (my $garbage,$Answ)=split(/_HASH_REF__/,$Answ,2);
                   1319:     my %Answer;
                   1320:     %Answer=&Apache::lonnet::str2hash($Answ);
                   1321:     my %Partdata;
                   1322:     foreach my $part (@{$Answer{'parts'}}) {
                   1323:         while (my($key,$value) = each(%Answer)) {
                   1324:             #
                   1325:             # Logging code:
1.7       matthew  1326:             if (0) {
1.4       matthew  1327:                 &Apache::lonnet::logthis($part.' got key "'.$key.'"');
                   1328:                 if (ref($value) eq 'ARRAY') {
                   1329:                     &Apache::lonnet::logthis('    @'.join(',',@$value));
                   1330:                 } else {
                   1331:                     &Apache::lonnet::logthis('    '.$value);
                   1332:                 }
                   1333:             }
                   1334:             # End of logging code
1.51      albertel 1335:             next if ($key !~ /^\Q$part\E/);
                   1336:             $key =~ s/^\Q$part\E\.//;
1.4       matthew  1337:             if (ref($value) eq 'ARRAY') {
                   1338:                 if ($key eq 'options') {
                   1339:                     $Partdata{$part}->{'_Options'}=$value;
                   1340:                 } elsif ($key eq 'concepts') {
                   1341:                     $Partdata{$part}->{'_Concepts'}=$value;
1.28      matthew  1342:                 } elsif ($key eq 'items') {
                   1343:                     $Partdata{$part}->{'_Items'}=$value;
1.4       matthew  1344:                 } elsif ($key =~ /^concept\.(.*)$/) {
                   1345:                     my $concept = $1;
                   1346:                     foreach my $foil (@$value) {
                   1347:                         $Partdata{$part}->{'_Foils'}->{$foil}->{'_Concept'}=
                   1348:                                                                       $concept;
                   1349:                     }
1.32      matthew  1350:                 } elsif ($key =~ /^(unit|incorrect|answer|ans_low|ans_high|str_type)$/) {
1.4       matthew  1351:                     $Partdata{$part}->{$key}=$value;
                   1352:                 }
                   1353:             } else {
                   1354:                 if ($key=~ /^foil\.text\.(.*)$/) {
                   1355:                     my $foil = $1;
                   1356:                     $Partdata{$part}->{'_Foils'}->{$foil}->{'name'}=$foil;
                   1357:                     $value =~ s/(\s*$|^\s*)//g;
                   1358:                     $Partdata{$part}->{'_Foils'}->{$foil}->{'text'}=$value;
                   1359:                 } elsif ($key =~ /^foil\.value\.(.*)$/) {
                   1360:                     my $foil = $1;
                   1361:                     $Partdata{$part}->{'_Foils'}->{$foil}->{'value'}=$value;
1.28      matthew  1362:                 } elsif ($key eq 'answercomputed') {
                   1363:                     $Partdata{$part}->{'answercomputed'} = $value;
1.4       matthew  1364:                 }
                   1365:             }
                   1366:         }
                   1367:     }
1.28      matthew  1368:     # Further debugging code
                   1369:     if (0) {
                   1370:         &Apache::lonnet::logthis('lonstathelpers::get_problem_data');
                   1371:         &log_hash_ref(\%Partdata);
                   1372:     }
1.4       matthew  1373:     return %Partdata;
1.5       matthew  1374: }
                   1375: 
1.28      matthew  1376: sub log_array_ref {
                   1377:     my ($arrayref,$prefix) = @_;
                   1378:     return if (ref($arrayref) ne 'ARRAY');
                   1379:     if (! defined($prefix)) { $prefix = ''; };
                   1380:     foreach my $v (@$arrayref) {
                   1381:         if (ref($v) eq 'ARRAY') {
                   1382:             &log_array_ref($v,$prefix.'  ');
                   1383:         } elsif (ref($v) eq 'HASH') {
                   1384:             &log_hash_ref($v,$prefix.'  ');
                   1385:         } else {
                   1386:             &Apache::lonnet::logthis($prefix.'"'.$v.'"');
                   1387:         }
                   1388:     }
                   1389: }
                   1390: 
                   1391: sub log_hash_ref {
                   1392:     my ($hashref,$prefix) = @_;
                   1393:     return if (ref($hashref) ne 'HASH');
                   1394:     if (! defined($prefix)) { $prefix = ''; };
                   1395:     while (my ($k,$v) = each(%$hashref)) {
                   1396:         if (ref($v) eq 'ARRAY') {
                   1397:             &Apache::lonnet::logthis($prefix.'"'.$k.'" = array');
                   1398:             &log_array_ref($v,$prefix.'  ');
                   1399:         } elsif (ref($v) eq 'HASH') {
                   1400:             &Apache::lonnet::logthis($prefix.'"'.$k.'" = hash');
                   1401:             &log_hash_ref($v,$prefix.'  ');
                   1402:         } else {
                   1403:             &Apache::lonnet::logthis($prefix.'"'.$k.'" => "'.$v.'"');
                   1404:         }
                   1405:     }
                   1406: }
1.5       matthew  1407: ####################################################
                   1408: ####################################################
                   1409: 
                   1410: =pod
                   1411: 
                   1412: =item &limit_by_time()
                   1413: 
                   1414: =cut
                   1415: 
                   1416: ####################################################
                   1417: ####################################################
                   1418: sub limit_by_time_form {
                   1419:     my $Starttime_form = '';
                   1420:     my $starttime = &Apache::lonhtmlcommon::get_date_from_form
                   1421:         ('limitby_startdate');
                   1422:     my $endtime = &Apache::lonhtmlcommon::get_date_from_form
                   1423:         ('limitby_enddate');
                   1424:     if (! defined($endtime)) {
                   1425:         $endtime = time;
                   1426:     }
                   1427:     if (! defined($starttime)) {
                   1428:         $starttime = $endtime - 60*60*24*7;
                   1429:     }
                   1430:     my $state;
                   1431:     if (&limit_by_time()) {
                   1432:         $state = '';
                   1433:     } else {
                   1434:         $state = 'disabled';
                   1435:     }
                   1436:     my $startdateform = &Apache::lonhtmlcommon::date_setter
                   1437:         ('Statistics','limitby_startdate',$starttime,undef,undef,$state);
                   1438:     my $enddateform = &Apache::lonhtmlcommon::date_setter
                   1439:         ('Statistics','limitby_enddate',$endtime,undef,undef,$state);
                   1440:     my $Str;
1.58      bisitz   1441:     $Str .= '<script type="text/javascript" language="JavaScript">';
1.5       matthew  1442:     $Str .= 'function toggle_limitby_activity(state) {';
                   1443:     $Str .= '    if (state) {';
                   1444:     $Str .= '        limitby_startdate_enable();';
                   1445:     $Str .= '        limitby_enddate_enable();';
                   1446:     $Str .= '    } else {';
                   1447:     $Str .= '        limitby_startdate_disable();';
                   1448:     $Str .= '        limitby_enddate_disable();';
                   1449:     $Str .= '    }';    
                   1450:     $Str .= '}';
                   1451:     $Str .= '</script>';
                   1452:     $Str .= '<fieldset>';
                   1453:     my $timecheckbox = '<input type="checkbox" name="limit_by_time" ';
                   1454:     if (&limit_by_time()) {
1.72      bisitz   1455:         $timecheckbox .= 'checked="checked" ';
1.5       matthew  1456:     } 
1.72      bisitz   1457:     $timecheckbox .= 'onchange="javascript:toggle_limitby_activity(this.checked);" ';
1.5       matthew  1458:     $timecheckbox .= ' />';
1.49      albertel 1459:     $Str .= '<legend><label>'.&mt('[_1] Limit by time',$timecheckbox).'</label></legend>';
1.5       matthew  1460:     $Str .= &mt('Start Time: [_1]',$startdateform).'<br />';
                   1461:     $Str .= &mt('&nbsp;End Time: [_1]',$enddateform).'<br />';
                   1462:     $Str .= '</fieldset>';
                   1463:     return $Str;
                   1464: }
                   1465: 
                   1466: sub limit_by_time {
1.46      albertel 1467:     if (exists($env{'form.limit_by_time'}) &&
                   1468:         $env{'form.limit_by_time'} ne '' ) {
1.5       matthew  1469:         return 1;
                   1470:     } else {
                   1471:         return 0;
                   1472:     }
                   1473: }
                   1474: 
                   1475: sub get_time_limits {
                   1476:     my $starttime = &Apache::lonhtmlcommon::get_date_from_form
                   1477:         ('limitby_startdate');
                   1478:     my $endtime = &Apache::lonhtmlcommon::get_date_from_form
                   1479:         ('limitby_enddate');
                   1480:     return ($starttime,$endtime);
1.11      matthew  1481: }
                   1482: 
1.2       matthew  1483: ####################################################
                   1484: ####################################################
                   1485: 
                   1486: =pod
                   1487: 
1.12      matthew  1488: =item &manage_caches
                   1489: 
                   1490: Inputs: $r, apache request object
                   1491: 
                   1492: Returns: An array of scalars containing html for buttons.
                   1493: 
                   1494: =cut
                   1495: 
                   1496: ####################################################
                   1497: ####################################################
                   1498: sub manage_caches {
1.23      matthew  1499:     my ($r,$formname,$inputname,$update_message) = @_;
1.12      matthew  1500:     &Apache::loncoursedata::clear_internal_caches();
1.16      matthew  1501:     my $sectionkey = 
                   1502:         join(',',
                   1503:              map {
1.53      www      1504:                      &escape($_);
1.44      matthew  1505:                  } sort(&Apache::lonstatistics::get_selected_sections())
1.16      matthew  1506:              );
                   1507:     my $statuskey = $Apache::lonstatistics::enrollment_status;
1.46      albertel 1508:     if (exists($env{'form.ClearCache'}) || 
                   1509:         exists($env{'form.updatecaches'}) || 
                   1510:         (exists($env{'form.firstrun'}) && $env{'form.firstrun'} ne 'no') ||
                   1511:         (exists($env{'form.prevsection'}) &&
                   1512:             $env{'form.prevsection'} ne $sectionkey) ||
                   1513:         (exists($env{'form.prevenrollstatus'}) &&
                   1514:             $env{'form.prevenrollstatus'} ne $statuskey)
1.16      matthew  1515:         ) {
1.23      matthew  1516:         if (defined($update_message)) {
                   1517:             $r->print($update_message);
                   1518:         }
1.40      matthew  1519:         if (0) {
                   1520:             &Apache::lonnet::logthis('Updating mysql student data caches');
                   1521:         }
1.36      matthew  1522:         &gather_full_student_data($r,$formname,$inputname);
1.12      matthew  1523:     }
                   1524:     #
1.16      matthew  1525:     my @Buttons = 
                   1526:         ('<input type="submit" name="ClearCache" '.
                   1527:              'value="'.&mt('Clear Caches').'" />',
                   1528:          '<input type="submit" name="updatecaches" '.
1.17      matthew  1529:              'value="'.&mt('Update Caches').'" />'.
                   1530:          &Apache::loncommon::help_open_topic('Statistics_Cache'),
1.16      matthew  1531:          '<input type="hidden" name="prevsection" value="'.$sectionkey.'" />',
                   1532:          '<input type="hidden" name="prevenrollstatus" value="'.$statuskey.'" />'
                   1533:          );
                   1534:     #
1.46      albertel 1535:     if (! exists($env{'form.firstrun'})) {
1.12      matthew  1536:         $r->print('<input type="hidden" name="firstrun" value="yes" />');
                   1537:     } else {
                   1538:         $r->print('<input type="hidden" name="firstrun" value="no" />');
                   1539:     }
                   1540:     #
                   1541:     return @Buttons;
                   1542: }
                   1543: 
1.36      matthew  1544: sub gather_full_student_data {
                   1545:     my ($r,$formname,$inputname) = @_;
                   1546:     my $status_type;
                   1547:     if (defined($formname)) {
                   1548:         $status_type = 'inline';
                   1549:     } else {
                   1550:         $status_type = 'popup';
                   1551:     }
                   1552:     my $c = $r->connection();
                   1553:     #
                   1554:     &Apache::loncoursedata::clear_internal_caches();
                   1555:     #
                   1556:     my @Students = @Apache::lonstatistics::Students;
                   1557:     #
                   1558:     # Open the progress window
1.68      www      1559:     my %prog_state=&Apache::lonhtmlcommon::Create_PrgWin($r,scalar(@Students));
1.36      matthew  1560:     #
                   1561:     while (my $student = shift @Students) {
                   1562:         return if ($c->aborted());
                   1563:         my $status = &Apache::loncoursedata::ensure_current_full_data
                   1564:             ($student->{'username'},$student->{'domain'},
1.46      albertel 1565:              $env{'request.course.id'});
1.36      matthew  1566:         &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state,
                   1567:                                                  &mt('last student'));
                   1568:     }
                   1569:     &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
                   1570:     $r->rflush();
                   1571:     return;
                   1572: }
1.12      matthew  1573: 
1.38      matthew  1574: ####################################################
                   1575: ####################################################
                   1576: 
                   1577: =pod
                   1578: 
                   1579: =item &submission_report_form
                   1580: 
                   1581: Input: The originating reportSelected value for the current stats page.
                   1582: 
                   1583: Output: Scalar containing HTML with needed form elements and a link to 
                   1584: the student submission reports page.
                   1585: 
                   1586: =cut
                   1587: 
                   1588: ####################################################
                   1589: ####################################################
                   1590: sub submission_report_form {
                   1591:     my ($original_report) = @_;
                   1592:     # Note: In the link below we change the reportSelected value.  If
                   1593:     # the user hits the 'back' button on the browser after getting their
                   1594:     # student submissions report, this value may still be around.  So we
                   1595:     # output a script block to set it properly.  If the $original_report
                   1596:     # value is unset, you are just asking for trouble.
                   1597:     if (! defined($original_report)) {
                   1598:         &Apache::lonnet::logthis
                   1599:             ('someone called lonstathelpers::submission_report_form without '.
                   1600:              ' enough input.');
                   1601:     }
                   1602:     my $html = $/.
1.58      bisitz   1603:         '<script type="text/javascript" language="JavaScript">'.
1.38      matthew  1604:         "document.Statistics.reportSelected.value='$original_report';".
                   1605:         '</script>'.
                   1606:         '<input type="hidden" name="correctans" value="true" />'.
                   1607:         '<input type="hidden" name="prob_status" value="true" />'.
                   1608:         '<input type="hidden" name="all_sub" value="true" />';
                   1609:     my $output_selector = $/.'<select name="output">'.$/;
                   1610:     foreach ('HTML','Excel','CSV') {
                   1611:         $output_selector .= '    <option value="'.lc($_).'"';
1.46      albertel 1612:         if ($env{'form.output'} eq lc($_)) {
1.38      matthew  1613:             $output_selector .= ' selected ';
                   1614:         }
                   1615:         $output_selector .='>'.&mt($_).'</option>'.$/;
                   1616:     } 
                   1617:     $output_selector .= '</select>'.$/;
                   1618:     my $link = '<a href="javascript:'.
                   1619:        q{document.Statistics.reportSelected.value='student_submission_reports';}.
                   1620:        'document.Statistics.submit();">';
                   1621:     $html.= &mt('View data as [_1] [_2]go[_3]',$output_selector,
                   1622:                 $link,'</a>').$/;
                   1623:     return $html
                   1624: }
1.12      matthew  1625: 
                   1626: ####################################################
                   1627: ####################################################
                   1628: 
                   1629: =pod
                   1630: 
1.2       matthew  1631: =back
                   1632: 
                   1633: =cut
                   1634: 
                   1635: ####################################################
                   1636: ####################################################
1.1       matthew  1637: 
                   1638: 1;
                   1639: 
                   1640: __END__

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