Annotation of loncom/interface/statistics/lonstathelpers.pm, revision 1.76.2.1

1.1       matthew     1: # The LearningOnline Network with CAPA
                      2: #
1.76.2.1! raeburn     3: # $Id: lonstathelpers.pm,v 1.76 2020/08/26 18:13:39 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.'" />'.$rendered_problem.
                     96:         '</div>';
1.1       matthew    97: }
1.2       matthew    98: 
                     99: ####################################################
                    100: ####################################################
                    101: 
                    102: =pod
                    103: 
1.40      matthew   104: =item &get_resources
                    105: 
                    106: =cut
                    107: 
                    108: ####################################################
                    109: ####################################################
                    110: sub get_resources {
1.76.2.1! raeburn   111:     my ($navmap,$sequence) = @_;
        !           112:     my @resources = $navmap->retrieveResources($sequence,
        !           113:                                                sub { shift->is_problem(); },
        !           114:                                                0,0,0);
1.40      matthew   115:     return @resources;
                    116: }
                    117: 
                    118: ####################################################
                    119: ####################################################
                    120: 
                    121: =pod
                    122: 
                    123: =item &problem_selector($AcceptedResponseTypes)
1.2       matthew   124: 
                    125: Input: scalar containing regular expression which matches response
                    126: types to show.  '.' will yield all, '(option|radiobutton)' will match
                    127: all option response and radiobutton problems.
                    128: 
                    129: Returns: A string containing html for a table which lists the sequences
                    130: and their contents.  A radiobutton is provided for each problem.
1.14      matthew   131: Skips 'survey' problems.
1.2       matthew   132: 
                    133: =cut
                    134: 
                    135: ####################################################
                    136: ####################################################
1.40      matthew   137: sub problem_selector {
1.76      raeburn   138:     my ($AcceptedResponseTypes,$sequence_addendum,$symbmode,$all,$prefix,
                    139:         $byres,$include_tools,$smallbox,$onclick) = @_;
1.65      www       140: # all: also make sequences selectable
                    141: # prefix: prefix for all form names
1.76      raeburn   142: # byres: radiobutton shown per resource
                    143: # include_tools: external tools included 
1.65      www       144: # smallbox: use smaller box
                    145: # onclick: javascript to execute when clicked
1.2       matthew   146:     my $Str;
1.65      www       147:     my $jsadd='';
                    148:     if ($onclick) {
1.71      bisitz    149:         $jsadd="onclick='$onclick'";
1.65      www       150:     }
1.66      www       151:     $Str =  &Apache::loncommon::start_scrollbox(($smallbox?'420px':'620px'),
                    152:                                                 ($smallbox?'400px':'600px'),
                    153:                                                 ($smallbox?'60px':'300px')).
1.65      www       154:             &Apache::loncommon::start_data_table();
1.27      matthew   155:     my $rb_count =0;
1.40      matthew   156:     my ($navmap,@sequences) = 
                    157:         &Apache::lonstatistics::selected_sequences_with_assessments('all');
                    158:     return $navmap if (! ref($navmap)); # error
                    159:     foreach my $seq (@sequences) {
1.2       matthew   160:         my $seq_str = '';
1.76.2.1! raeburn   161:         foreach my $res (&get_resources($navmap,$seq)) {
1.76      raeburn   162:             my $title = $res->compTitle;
                    163:             if (! defined($title) || $title eq '') {
                    164:                 ($title) = ($res->src =~ m:/([^/]*)$:);
                    165:             }
                    166:             my $totalresps = 0;
                    167:             if ($byres) {
                    168:                 foreach my $part (@{$res->parts}) {
                    169:                     $totalresps += scalar($res->responseIds($part));
                    170:                 }
                    171:                 my $value = &HTML::Entities::encode($res->symb(),'<>&"');
                    172:                 my $checked;
                    173:                 if ($env{'form.problemchoice'} eq $res->symb()) {
                    174:                     $checked = ' checked="checked"';
                    175:                 }
                    176:                 $seq_str .= &Apache::loncommon::start_data_table_row().
                    177:                             '<td rowspan="'.$totalresps.'" style="vertical-align:middle">'.
                    178:                             '<label><input type="radio" name="symb" value="'.$value.'"'.$checked.' />'.
                    179:                             $title.'</label>';
                    180:                 my $link = $res->link.'?symb='.&escape($res->shown_symb);
                    181:                 $seq_str .= ('&nbsp;'x2).
                    182:                             '<a target="preview" href="'.$link.'">'.&mt('view').'</a></td>';
                    183:             }
                    184:             my %partsseen;
1.40      matthew   185:             foreach my $part (@{$res->parts}) {
1.76.2.1! raeburn   186:                 my @response_ids   = $res->responseIds($part);
        !           187:                 my @response_types = $res->responseType($part);
1.40      matthew   188:                 for (my $i=0;$i<scalar(@response_types);$i++){
                    189:                     my $respid = $response_ids[$i];
                    190:                     my $resptype = $response_types[$i];
1.2       matthew   191:                     if ($resptype =~ m/$AcceptedResponseTypes/) {
1.76      raeburn   192:                         if ($byres) {
                    193:                             unless (exists($partsseen{$part})) {
                    194:                                 my $parttitle = $part;
                    195:                                 if ($part eq '0') {
                    196:                                     $parttitle = '';
                    197:                                 }
                    198:                                 if ($parttitle ne '') {
                    199:                                     $parttitle = ('&nbsp;'x2).&mt('part').':&nbsp;'.$parttitle;
                    200:                                 }
                    201:                                 if (keys(%partsseen)) {
                    202:                                     $seq_str .= &Apache::loncommon::continue_data_table_row();
                    203:                                 }
                    204:                                 unless ($partsseen{$part}) {
                    205:                                     $seq_str .= '<td rowspan="'.scalar(@response_ids).'" style="vertical-align:middle">'.
                    206:                                                 $parttitle.'</td>';
                    207:                                     $partsseen{$part} = scalar(@response_ids);
                    208:                                 }
                    209:                             }
                    210:                             $seq_str .= '<td>'.$resptype;
                    211:                             if (scalar(@response_ids) > 1) {
                    212:                                 $seq_str .= '&nbsp;'.&mt('id').':&nbsp;'.$respid;
                    213:                             }
                    214:                             $seq_str .= '</td>'. &Apache::loncommon::end_data_table_row()."\n";
                    215:                         } else {
                    216:                             my $value = &make_target_id({symb=>$res->symb,
                    217:                                                          part=>$part,
                    218:                                                          respid=>$respid,
                    219:                                                          resptype=>$resptype});
                    220:                             my $checked = '';
                    221:                             if ($env{'form.problemchoice'} eq $value) {
                    222:                                 $checked = ' checked="checked"';
                    223:                             }
                    224:                             $seq_str .= &Apache::loncommon::start_data_table_row().
                    225:                                 ($symbmode?
                    226:                                  '<td><input type="radio" id="'.$prefix.$rb_count.'" name="'.$prefix.'symb" value="'.&HTML::Entities::encode($res->symb,'<>&"').'" '.$checked.' '.
                    227:                                  $jsadd.
                    228:                                  ' /></td>'
                    229:                                  :qq{<td><input type="radio" id="$rb_count" name="problemchoice" value="$value"$checked /></td>}).
                    230:                                 '<td><label for="'.$prefix.$rb_count.'">'.$resptype.'</label></td>'.
                    231:                                 '<td><label for="'.$prefix.$rb_count.'">'.$title.'</label>';
                    232:                             if (scalar(@response_ids) > 1) {
                    233:                                 $seq_str .= &mt('response').' '.$respid;
                    234:                             }
                    235:                             my $link = $res->link.'?symb='.&escape($res->shown_symb);
                    236:                             $seq_str .= ('&nbsp;'x2).
                    237:                                         '<a target="preview" href="'.$link.'">'.&mt('view').'</a>';
                    238:                             $seq_str .= "</td>". &Apache::loncommon::end_data_table_row()."\n";
                    239:                             $rb_count++;
1.2       matthew   240:                         }
                    241:                     }
                    242:                 }
                    243:             }
                    244:         }
                    245:         if ($seq_str ne '') {
1.76      raeburn   246:             if ($byres) {
1.61      www       247:                 $Str .= &Apache::loncommon::start_data_table_header_row().
1.76      raeburn   248:                         '<th colspan="3">'.$seq->compTitle.'</th>'.
                    249:                         &Apache::loncommon::end_data_table_header_row().
                    250:                         $seq_str;
                    251:             } else {
                    252:                 $Str .= &Apache::loncommon::start_data_table_header_row().
                    253:                     '<th colspan="3">'.
                    254:                     ($all?'<input type="radio" id="'.$prefix.'s'.$rb_count.'" name="'.$prefix.'symb" value="'.&HTML::Entities::encode($seq->symb,'<>&').'" '.$jsadd.' />':'').
                    255:                     $seq->compTitle.'</th>'.
                    256:                     &Apache::loncommon::end_data_table_header_row()."\n".$seq_str;
                    257:                 if (defined($sequence_addendum)) {
                    258:                     $Str .= &Apache::loncommon::start_data_table_header_row().
                    259:                         ('<td>&nbsp;</td>'x2).
                    260:                         '<td align="right">'.$sequence_addendum.'</td>'.
                    261:                         &Apache::loncommon::end_data_table_header_row()."\n";
                    262:                 }
1.50      matthew   263:             }
1.2       matthew   264:         }
                    265:     }
1.64      www       266:     $Str .= &Apache::loncommon::end_data_table().&Apache::loncommon::end_scrollbox()."\n";
1.2       matthew   267:     return $Str;
                    268: }
                    269: 
                    270: ####################################################
                    271: ####################################################
                    272: 
                    273: =pod
                    274: 
1.24      matthew   275: =item &MultipleProblemSelector($navmap,$selected,$inputname)
1.21      matthew   276: 
                    277: Generate HTML with checkboxes for problem selection.
                    278: 
                    279: Input: 
                    280: 
                    281: $navmap: a navmap object.  If undef, navmaps will be called to create a
                    282: new object.
                    283: 
                    284: $selected: Scalar, Array, or hash reference of currently selected items.
                    285: 
                    286: $inputname: The name of the form elements to use for the checkboxs.
                    287: 
                    288: Returns: A string containing html for a table which lists the sequences
                    289: and their contents.  A checkbox is provided for each problem.
                    290: 
                    291: =cut
                    292: 
                    293: ####################################################
                    294: ####################################################
                    295: sub MultipleProblemSelector {
1.63      raeburn   296:     my ($navmap,$inputname,$formname,$anoncounter)=@_;
1.46      albertel  297:     my $cid = $env{'request.course.id'};
1.21      matthew   298:     my $Str;
                    299:     # Massage the input as needed.
                    300:     if (! defined($navmap)) {
                    301:         $navmap = Apache::lonnavmaps::navmap->new();
                    302:         if (! defined($navmap)) {
1.56      bisitz    303:             $Str .= '<div class="LC_error">'
                    304:                    .&mt('Error: cannot process course structure')
                    305:                    .'</div>';
1.21      matthew   306:             return $Str;
                    307:         }
                    308:     }
                    309:     my $selected = {map { ($_,1) } (&get_selected_symbs($inputname))};
                    310:     # Header
                    311:     $Str .= <<"END";
1.58      bisitz    312: <script type="text/javascript" language="JavaScript">
1.25      matthew   313:     function checkall(value,seqid) {
1.21      matthew   314:         for (i=0; i<document.forms.$formname.elements.length; i++) {
                    315:             ele = document.forms.$formname.elements[i];
                    316:             if (ele.name == '$inputname') {
1.25      matthew   317:                 if (seqid != null) {
                    318:                     itemid = document.forms.$formname.elements[i].id;
                    319:                     thing = itemid.split(':');
                    320:                     if (thing[0] == seqid) {
                    321:                         document.forms.$formname.elements[i].checked=value;
                    322:                     }
                    323:                 } else {
                    324:                     document.forms.$formname.elements[i].checked=value;
                    325:                 }
1.21      matthew   326:             }
                    327:         }
                    328:     }
                    329: </script>
                    330: END
1.63      raeburn   331:     my $checkanonjs = <<"END";
                    332:  
                    333: <script type="text/javascript" language="JavaScript">
                    334:     function checkanon() {
                    335:         return true;
                    336:     }
                    337: </script>
                    338: 
                    339: END
                    340:     if (ref($anoncounter) eq 'HASH') {
                    341:         if (keys(%{$anoncounter}) > 0) {
1.74      damieng   342:             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");
                    343:             &js_escape(\$anonwarning);
1.63      raeburn   344:             $checkanonjs = <<"END";
                    345: 
                    346: <script type="text/javascript" language="JavaScript">
                    347:     function checkanon() {
                    348:         anoncount = 0;
                    349:         namedcount = 0;
                    350:         for (i=0; i<document.forms.$formname.elements.length; i++) {
                    351:             ele = document.forms.$formname.elements[i];
                    352:             if (ele.name == '$inputname') {
                    353:                 itemid = document.forms.$formname.elements[i].id;
                    354:                 if (document.forms.$formname.elements[i].checked) {
                    355:                     anonid = 'anonymous_'+itemid;
                    356:                     mixid = 'mixed_'+itemid;
                    357:                     anonele = document.getElementById(anonid);
                    358:                     mixele = document.getElementById(mixid);
                    359:                     if (anonele.value > 0) {
                    360:                         if (mixele.value == 'none') {
                    361:                             anoncount ++;
                    362:                         } else {
                    363:                             if (mixele.value == '0') {
                    364:                                 if (mixele.checked) {
                    365:                                     anoncount ++; 
                    366:                                 } else {
                    367:                                     namedcount ++;
                    368:                                 } 
                    369:                             } else {
                    370:                                 namedcount ++;
                    371:                             }
                    372:                         }
                    373:                     } else {
                    374:                         namedcount ++;
                    375:                     }
                    376:                 }
                    377:             }
                    378:         }
                    379:         if (anoncount > 0 && namedcount > 0) {
                    380:             alert("$anonwarning");
                    381:             return false;
                    382:         } 
                    383:     }
                    384: </script>
                    385: 
                    386: END
                    387:         }
                    388:     }
                    389:     $Str .= $checkanonjs.
1.21      matthew   390:         '<a href="javascript:checkall(true)">'.&mt('Select All').'</a>'.
                    391:         ('&nbsp;'x4).
                    392:         '<a href="javascript:checkall(false)">'.&mt('Unselect All').'</a>';
                    393:     $Str .= $/.'<table>'.$/;
                    394:     my $iterator = $navmap->getIterator(undef, undef, undef, 1);
                    395:     my $sequence_string;
1.25      matthew   396:     my $seq_id = 0;
1.46      albertel  397:     my @Accumulator = (&new_accumulator($env{'course.'.$cid.'.description'},
1.21      matthew   398:                                         '',
                    399:                                         '',
1.25      matthew   400:                                         $seq_id++,
1.21      matthew   401:                                         $inputname));
                    402:     my @Sequence_Data;
                    403:     while (my $curRes = $iterator->next()) {
                    404:         if ($curRes == $iterator->END_MAP) {
                    405:             if (ref($Accumulator[-1]) eq 'CODE') {
1.24      matthew   406:                 my $old_accumulator = pop(@Accumulator);
                    407:                 push(@Sequence_Data,&{$old_accumulator}());
1.21      matthew   408:             }
                    409:         } elsif ($curRes == $iterator->BEGIN_MAP) {
                    410:             # Not much to do here.
                    411:         }
                    412:         next if (! ref($curRes));
                    413:         if ($curRes->is_map) {
1.24      matthew   414:             push(@Accumulator,&new_accumulator($curRes->compTitle,
1.21      matthew   415:                                                $curRes->src,
                    416:                                                $curRes->symb,
1.25      matthew   417:                                                $seq_id++,
1.21      matthew   418:                                                $inputname));
                    419:         } elsif ($curRes->is_problem) {
1.63      raeburn   420:             my $anonpart = 0;
                    421:             my $namedpart = 0;
                    422:             my @parts = @{$curRes->parts()};
                    423:             if (ref($anoncounter) eq 'HASH') {
                    424:                 if (keys(%{$anoncounter}) > 0) {
                    425:                     my @parts = @{$curRes->parts()};
                    426:                     my $symb = $curRes->symb();
                    427:                     foreach my $part (@parts) {
                    428:                         if ((exists($anoncounter->{$symb."\0".$part})) ||
                    429:                             $curRes->is_anonsurvey($part)) {
                    430:                             $anonpart ++;
                    431:                         } else {
                    432:                             $namedpart ++ 
                    433:                         }
                    434:                     }
                    435:                 }
                    436:             }
1.21      matthew   437:             if (@Accumulator && $Accumulator[-1] ne '') {
                    438:                 &{$Accumulator[-1]}($curRes,
1.63      raeburn   439:                                     exists($selected->{$curRes->symb}),
                    440:                                     $anonpart,$namedpart);
1.21      matthew   441:             }
                    442:         }
                    443:     }
                    444:     my $course_seq = pop(@Sequence_Data);
                    445:     foreach my $seq ($course_seq,@Sequence_Data) {
                    446:         #my $seq = pop(@Sequence_Data);
                    447:         next if (! defined($seq) || ref($seq) ne 'HASH');
                    448:         $Str.= '<tr><td colspan="2">'.
1.25      matthew   449:             '<b>'.$seq->{'title'}.'</b>'.('&nbsp;'x2).
                    450:             '<a href="javascript:checkall(true,'.$seq->{'id'}.')">'.
                    451:                                   &mt('Select').'</a>'.('&nbsp;'x2).
                    452:             '<a href="javascript:checkall(false,'.$seq->{'id'}.')">'.
                    453:                                   &mt('Unselect').'</a>'.('&nbsp;'x2).
1.21      matthew   454:             '</td></tr>'.$/;
                    455:         $Str.= $seq->{'html'};
                    456:     }
                    457:     $Str .= '</table>'.$/;
                    458:     return $Str;
                    459: }
                    460: 
                    461: sub new_accumulator {
1.25      matthew   462:     my ($title,$src,$symb,$seq_id,$inputname) = @_;
1.21      matthew   463:     my $target;
1.25      matthew   464:     my $item_id=0;
1.21      matthew   465:     return 
                    466:         sub {
                    467:             if (@_) { 
1.63      raeburn   468:                 my ($res,$checked,$anonpart,$namedpart) = @_;
1.23      matthew   469:                 $target.='<tr><td><label>'.
1.21      matthew   470:                     '<input type="checkbox" name="'.$inputname.'" ';
                    471:                 if ($checked) {
1.56      bisitz    472:                     $target .= 'checked="checked" ';
1.21      matthew   473:                 }
1.63      raeburn   474:                 my $anon_id = $item_id;
1.25      matthew   475:                 $target .= 'id="'.$seq_id.':'.$item_id++.'" ';
1.63      raeburn   476:                 my $esc_symb = &escape($res->symb);
1.21      matthew   477:                 $target.= 
1.63      raeburn   478:                     'value="'.$esc_symb.'" />'.
1.26      matthew   479:                     '&nbsp;'.$res->compTitle.'</label>'.
                    480:                     ('&nbsp;'x2).'<a target="preview" '.
1.55      raeburn   481:                     'href="'.$res->link.'?symb='.
1.56      bisitz    482:                     &escape($res->shown_symb).'">'.&mt('view').'</a>'.
1.63      raeburn   483:                     '<input type="hidden" id="anonymous_'.$seq_id.':'.$anon_id.'" name="hidden_'.$seq_id.':'.$anon_id.'" value="'.$anonpart.'" />';
                    484:                 my $mixed = '<input type="hidden" id="mixed_'.$seq_id.':'.$anon_id.'" value="none" name="mixed_'.$seq_id.':'.$anon_id.'" />';
                    485:                 if ($anonpart) {
                    486:                     if ($namedpart) {
                    487:                         my $checknamed = '';
                    488:                         my $checkedanon = ' checked="checked"';
                    489:                         if ($env{'form.mixed_'.$seq_id.':'.$anon_id} eq $esc_symb) {
                    490:                             $checknamed = $checkedanon;
                    491:                             $checkedanon = '';
                    492:                         }
                    493:                         $mixed = '&nbsp;('.
                    494:     &mt('Both anonymous and named submissions -- display: [_1]Anonymous [_2]Named[_3]',
                    495:     '<span class="LC_nobreak"><label>'.
                    496:     '<input type="radio" name="mixed_'.$seq_id.':'.$anon_id.
                    497:     '" value="0" id="mixed_'.$seq_id.':'.$anon_id.'"'.$checkedanon.' />',
                    498:     '</label></span>'.('&nbsp;'x2).' <span class="LC_nobreak">'.
                    499:     '<label><input type="radio" name="mixed_'.$seq_id.':'.$anon_id.
                    500:     '" value="symb_'.$esc_symb.'" id="named_'.$seq_id.':'.$anon_id.'"'.$checknamed.' />',
                    501:     '</label></span>').')';
                    502:                     } else {
                    503:                         $target .= '&nbsp;'.&mt('(Anonymous Survey)');
                    504:                     }
                    505:                 }
                    506:                 $target.= $mixed.'</td></tr>'.$/;
1.21      matthew   507:             } else { 
                    508:                 if (defined($target)) {
                    509:                     return { title => $title,
                    510:                              symb  => $symb,
                    511:                              src   => $src,
1.25      matthew   512:                              id    => $seq_id,
1.21      matthew   513:                              html  => $target, }; 
                    514:                 }
                    515:                 return undef;
                    516:             }
                    517:         };
                    518: }
                    519: 
                    520: sub get_selected_symbs {
                    521:     my ($inputfield) = @_;
                    522:     my $field = 'form.'.$inputfield;
1.48      matthew   523:     my @symbs = (map {
1.53      www       524:                      &unescape($_);
1.48      matthew   525:                      } &Apache::loncommon::get_env_multiple($field));
                    526:     return @symbs;
1.21      matthew   527: }
                    528: 
                    529: ####################################################
                    530: ####################################################
                    531: 
                    532: =pod
                    533: 
1.2       matthew   534: =item &make_target_id($target)
                    535: 
                    536: Inputs: Hash ref with the following entries:
                    537:     $target->{'symb'}, $target->{'part'}, $target->{'respid'}, 
                    538:     $target->{'resptype'}.
                    539: 
                    540: Returns: A string, suitable for a form parameter, which uniquely identifies
                    541: the problem, part, and response to do statistical analysis on.
                    542: 
                    543: Used by Apache::lonstathelpers::ProblemSelector().
                    544: 
                    545: =cut
                    546: 
                    547: ####################################################
                    548: ####################################################
                    549: sub make_target_id {
                    550:     my ($target) = @_;
1.53      www       551:     my $id = &escape($target->{'symb'}).':'.
                    552:              &escape($target->{'part'}).':'.
                    553:              &escape($target->{'respid'}).':'.
                    554:              &escape($target->{'resptype'});
1.2       matthew   555:     return $id;
                    556: }
                    557: 
                    558: ####################################################
                    559: ####################################################
                    560: 
                    561: =pod
                    562: 
                    563: =item &get_target_from_id($id)
                    564: 
                    565: Inputs: $id, a scalar string from Apache::lonstathelpers::make_target_id().
                    566: 
                    567: Returns: A hash reference, $target, containing the following keys:
                    568:     $target->{'symb'}, $target->{'part'}, $target->{'respid'}, 
                    569:     $target->{'resptype'}.
                    570: 
                    571: =cut
                    572: 
                    573: ####################################################
                    574: ####################################################
                    575: sub get_target_from_id {
                    576:     my ($id) = @_;
1.21      matthew   577:     if (! ref($id)) {
                    578:         my ($symb,$part,$respid,$resptype) = split(':',$id);
1.53      www       579:         return ({ symb     => &unescape($symb),
                    580:                   part     => &unescape($part),
                    581:                   respid   => &unescape($respid),
                    582:                   resptype => &unescape($resptype)});
1.21      matthew   583:     } elsif (ref($id) eq 'ARRAY') {
                    584:         my @Return;
                    585:         foreach my $selected (@$id) {
                    586:             my ($symb,$part,$respid,$resptype) = split(':',$selected);
1.53      www       587:             push(@Return,{ symb     => &unescape($symb),
                    588:                            part     => &unescape($part),
                    589:                            respid   => &unescape($respid),
                    590:                            resptype => &unescape($resptype)});
1.21      matthew   591:         }
                    592:         return \@Return;
                    593:     }
1.2       matthew   594: }
                    595: 
                    596: ####################################################
                    597: ####################################################
                    598: 
                    599: =pod
                    600: 
1.13      matthew   601: =item &get_prev_curr_next($target,$AcceptableResponseTypes,$granularity)
1.2       matthew   602: 
                    603: Determine the problem parts or responses preceeding and following the
                    604: current resource.
                    605: 
                    606: Inputs: $target (see &Apache::lonstathelpers::get_target_from_id())
                    607:   $AcceptableResponseTypes, regular expression matching acceptable
                    608:                             response types,
1.52      albertel  609:   $granularity, either 'part', 'response', 'part_survey', or 'part_task'
1.2       matthew   610: 
                    611: Returns: three hash references, $prev, $curr, $next, which refer to the
                    612: preceeding, current, or following problem parts or responses, depending
                    613: on the value of $granularity.  Values of undef indicate there is no
                    614: previous or next part/response.  A value of undef for all three indicates
                    615: there was no match found to the current part/resource.
                    616: 
                    617: The hash references contain the following keys:
                    618:     symb, part, resource
                    619: 
                    620: If $granularity eq 'response', the following ADDITIONAL keys will be present:
                    621:     respid, resptype
                    622: 
                    623: =cut
                    624: 
                    625: ####################################################
                    626: ####################################################
                    627: sub get_prev_curr_next {
                    628:     my ($target,$AcceptableResponseTypes,$granularity) = @_;
                    629:     #
                    630:     # Build an array with the data we need to search through
                    631:     my @Resource;
1.40      matthew   632:     my ($navmap,@sequences) = 
                    633:         &Apache::lonstatistics::selected_sequences_with_assessments('all');
                    634:     return $navmap if (! ref($navmap));
                    635:     foreach my $seq (@sequences) {
                    636:         my @resources = &get_resources($navmap,$seq);
                    637:         foreach my $res (@resources) {
                    638:             foreach my $part (@{$res->parts}) {
1.60      raeburn   639:                 if (($res->is_survey($part) || ($res->is_anonsurvey($part))) && 
                    640:                     ($granularity eq 'part_survey')) {
1.20      matthew   641:                     push (@Resource,
1.40      matthew   642:                           { symb     => $res->symb,
1.20      matthew   643:                             part     => $part,
                    644:                             resource => $res,
                    645:                         } );
1.52      albertel  646: 		} elsif ($res->is_task($part) && ($granularity eq 'part_task')){
                    647:                     push (@Resource,
                    648:                           { symb     => $res->symb,
                    649:                             part     => $part,
                    650:                             resource => $res,
                    651:                         } );
1.13      matthew   652:                 } elsif ($granularity eq 'part') {
1.2       matthew   653:                     push (@Resource,
1.40      matthew   654:                           { symb     => $res->symb,
1.2       matthew   655:                             part     => $part,
                    656:                             resource => $res,
                    657:                         } );
                    658:                 } elsif ($granularity eq 'response') {
1.40      matthew   659:                     my @response_ids   = $res->responseIds($part);
                    660:                     my @response_types = $res->responseType($part);
1.2       matthew   661:                     for (my $i=0;
1.40      matthew   662:                          $i<scalar(@response_ids);
1.2       matthew   663:                          $i++){
1.40      matthew   664:                         my $respid   = $response_ids[$i];
                    665:                         my $resptype = $response_types[$i];
1.2       matthew   666:                         next if ($resptype !~ m/$AcceptableResponseTypes/);
                    667:                         push (@Resource,
1.40      matthew   668:                               { symb     => $res->symb,
1.2       matthew   669:                                 part     => $part,
1.40      matthew   670:                                 respid   => $respid,
                    671:                                 resptype => $resptype,
1.2       matthew   672:                                 resource => $res,
                    673:                                 } );
                    674:                     }
                    675:                 }
                    676:             }
                    677:         }
                    678:     }
                    679:     #
                    680:     # Get the index of the current situation
                    681:     my $curr_idx;
                    682:     for ($curr_idx=0;$curr_idx<$#Resource;$curr_idx++) {
                    683:         my $curr_item = $Resource[$curr_idx];
1.52      albertel  684:         if ($granularity =~ /^(part|part_survey|part_task)$/) {
1.2       matthew   685:             if ($curr_item->{'symb'} eq $target->{'symb'} &&
                    686:                 $curr_item->{'part'} eq $target->{'part'}) {
                    687:                 last;
                    688:             }
                    689:         } elsif ($granularity eq 'response') {
                    690:             if ($curr_item->{'symb'} eq $target->{'symb'} &&
                    691:                 $curr_item->{'part'} eq $target->{'part'} &&
                    692:                 $curr_item->{'respid'} eq $target->{'respid'} &&
                    693:                 $curr_item->{'resptype'} eq $target->{'resptype'}) {
                    694:                 last;
                    695:             }
                    696:         }
                    697:     }
                    698:     my $curr_item = $Resource[$curr_idx];
1.52      albertel  699:     if ($granularity =~ /^(part|part_survey|part_task)$/) {
1.2       matthew   700:         if ($curr_item->{'symb'}     ne $target->{'symb'} ||
                    701:             $curr_item->{'part'}     ne $target->{'part'}) {
                    702:             # bogus symb - return nothing
                    703:             return (undef,undef,undef);
                    704:         }
                    705:     } elsif ($granularity eq 'response') {
                    706:         if ($curr_item->{'symb'}     ne $target->{'symb'} ||
                    707:             $curr_item->{'part'}     ne $target->{'part'} ||
                    708:             $curr_item->{'respid'}   ne $target->{'respid'} ||
                    709:             $curr_item->{'resptype'} ne $target->{'resptype'}){
                    710:             # bogus symb - return nothing
                    711:             return (undef,undef,undef);
                    712:         }
                    713:     }
                    714:     #
                    715:     # Now just pick up the data we need
                    716:     my ($prev,$curr,$next);
                    717:     if ($curr_idx == 0) {
                    718:         $prev = undef;
                    719:         $curr = $Resource[$curr_idx  ];
                    720:         $next = $Resource[$curr_idx+1];
                    721:     } elsif ($curr_idx == $#Resource) {
                    722:         $prev = $Resource[$curr_idx-1];
                    723:         $curr = $Resource[$curr_idx  ];
                    724:         $next = undef;
                    725:     } else {
                    726:         $prev = $Resource[$curr_idx-1];
                    727:         $curr = $Resource[$curr_idx  ];
                    728:         $next = $Resource[$curr_idx+1];
                    729:     }
1.40      matthew   730:     return ($navmap,$prev,$curr,$next);
1.4       matthew   731: }
                    732: 
1.9       matthew   733: 
                    734: #####################################################
                    735: #####################################################
                    736: 
                    737: =pod
                    738: 
                    739: =item GetStudentAnswers($r,$problem,$Students)
                    740: 
                    741: Determines the correct answer for a set of students on a given problem.
                    742: The students answers are stored in the student hashes pointed to by the
                    743: array @$Students under the key 'answer'.
                    744: 
                    745: Inputs: $r
                    746: $problem: hash reference containing the keys 'resource', 'part', and 'respid'.
                    747: $Students: reference to array containing student hashes (need 'username', 
                    748:     'domain').  
                    749: 
                    750: Returns: nothing 
                    751: 
                    752: =cut
                    753: 
                    754: #####################################################
                    755: #####################################################
                    756: sub GetStudentAnswers {
1.12      matthew   757:     my ($r,$problem,$Students,$formname,$inputname) = @_;
1.31      matthew   758:     my %answers;
1.12      matthew   759:     my $status_type;
                    760:     if (defined($formname)) {
                    761:         $status_type = 'inline';
                    762:     } else {
                    763:         $status_type = 'popup';
                    764:     }    
1.9       matthew   765:     my $c = $r->connection();
                    766:     my %Answers;
                    767:     my ($resource,$partid,$respid) = ($problem->{'resource'},
                    768:                                       $problem->{'part'},
                    769:                                       $problem->{'respid'});
                    770:     # Read in the cache (if it exists) before we start timing things.
                    771:     &Apache::lonstathelpers::ensure_proper_cache($resource->{'symb'});
                    772:     # Open progress window
1.68      www       773:     my %prog_state=&Apache::lonhtmlcommon::Create_PrgWin($r,scalar(@$Students));
1.9       matthew   774:     $r->rflush();
                    775:     foreach my $student (@$Students) {
                    776:         last if ($c->aborted());
                    777:         my $sname = $student->{'username'};
                    778:         my $sdom = $student->{'domain'};
1.30      matthew   779:         my $answer = &Apache::lonstathelpers::get_student_answer
1.9       matthew   780:             ($resource,$sname,$sdom,$partid,$respid);
                    781:         &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state,
1.62      bisitz    782:                                                      'last student');
1.31      matthew   783:         $answers{$answer}++;
1.9       matthew   784:         $student->{'answer'} = $answer;
                    785:     }
1.29      matthew   786:     &Apache::lonstathelpers::write_analysis_cache();
1.9       matthew   787:     return if ($c->aborted());
                    788:     $r->rflush();
                    789:     # close progress window
                    790:     &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
1.31      matthew   791:     return \%answers;
1.9       matthew   792: }
1.4       matthew   793: 
                    794: #####################################################
                    795: #####################################################
                    796: 
                    797: =pod
                    798: 
                    799: =item analyze_problem_as_student
                    800: 
1.30      matthew   801: Analyzes a homework problem for a student
1.4       matthew   802: 
                    803: Inputs: $resource: a resource object
                    804:         $sname, $sdom, $partid, $respid
                    805: 
1.30      matthew   806: Returns: the problem analysis hash
1.6       matthew   807: 
1.4       matthew   808: =cut
                    809: 
                    810: #####################################################
                    811: #####################################################
                    812: sub analyze_problem_as_student {
1.30      matthew   813:     my ($resource,$sname,$sdom) = @_;
1.22      matthew   814:     if (ref($resource) ne 'HASH') {
                    815:         my $res = $resource;
                    816:         $resource = { 'src' => $res->src,
                    817:                       'symb' => $res->symb,
                    818:                       'parts' => $res->parts };
                    819:         foreach my $part (@{$resource->{'parts'}}) {
                    820:             $resource->{'partdata'}->{$part}->{'ResponseIds'}=
                    821:                 [$res->responseIds($part)];
                    822:         }
                    823:     }
1.4       matthew   824:     my $url = $resource->{'src'};
                    825:     my $symb = $resource->{'symb'};
1.29      matthew   826:     my $analysis = &get_from_analysis_cache($sname,$sdom,$symb);
                    827:     if (! defined($analysis)) {
1.46      albertel  828:         my $courseid = $env{'request.course.id'};
1.29      matthew   829:         my $Answ=&Apache::lonnet::ssi($url,('grade_target' => 'analyze',
                    830:                                             'grade_domain' => $sdom,
                    831:                                             'grade_username' => $sname,
                    832:                                             'grade_symb' => $symb,
                    833:                                             'grade_courseid' => $courseid));
                    834:         (my $garbage,$analysis)=split(/_HASH_REF__/,$Answ,2);
                    835:         &store_analysis($sname,$sdom,$symb,$analysis);
                    836:     }
                    837:     my %Answer=&Apache::lonnet::str2hash($analysis);
1.6       matthew   838:     #
1.30      matthew   839:     return \%Answer;
                    840: }
                    841: 
                    842: #####################################################
                    843: #####################################################
                    844: 
                    845: =pod
                    846: 
                    847: =item get_student_answer
                    848: 
                    849: Analyzes a homework problem for a particular student and returns the correct 
                    850: answer.  Attempts to put together an answer for problem types 
                    851: that do not natively support it.
                    852: 
                    853: Inputs: $resource: a resource object (from navmaps or hash from loncoursedata)
                    854:         $sname, $sdom, $partid, $respid
                    855: 
                    856: Returns: $answer
                    857: 
                    858: If $partid and $respid are specified, $answer is simply a scalar containing
                    859: the correct answer for the response.
                    860: 
                    861: If $partid or $respid are undefined, $answer will be a hash reference with
                    862: keys $partid.'.'.$respid.'.answer'.
                    863: 
                    864: =cut
                    865: 
                    866: #####################################################
                    867: #####################################################
                    868: sub get_student_answer {
                    869:     my ($resource,$sname,$sdom,$partid,$respid) = @_;
                    870:     #
                    871:     if (ref($resource) ne 'HASH') {
                    872:         my $res = $resource;
                    873:         $resource = { 'src' => $res->src,
                    874:                       'symb' => $res->symb,
                    875:                       'parts' => $res->parts };
                    876:         foreach my $part (@{$resource->{'parts'}}) {
                    877:             $resource->{'partdata'}->{$part}->{'ResponseIds'}=
                    878:                 [$res->responseIds($part)];
                    879:         }
                    880:     }
                    881:     #
                    882:     my $analysis = 
                    883:         &analyze_problem_as_student($resource,$sname,$sdom);
1.29      matthew   884:     my $answer;
1.8       matthew   885:     foreach my $partid (@{$resource->{'parts'}}) {
1.6       matthew   886:         my $partdata = $resource->{'partdata'}->{$partid};
                    887:         foreach my $respid (@{$partdata->{'ResponseIds'}}) {
                    888:             my $prefix = $partid.'.'.$respid;
                    889:             my $key = $prefix.'.answer';
1.30      matthew   890:             $answer->{$partid}->{$respid} = 
                    891:                 &get_answer($prefix,$key,%$analysis);
1.6       matthew   892:         }
1.8       matthew   893:     }
1.30      matthew   894:     my $returnvalue;
1.8       matthew   895:     if (! defined($partid)) {
                    896:         $returnvalue = $answer;
                    897:     } elsif (! defined($respid)) {
                    898:         $returnvalue = $answer->{$partid};
1.6       matthew   899:     } else {
1.8       matthew   900:         $returnvalue = $answer->{$partid}->{$respid};
1.6       matthew   901:     }
                    902:     return $returnvalue;
                    903: }
                    904: 
                    905: sub get_answer {
                    906:     my ($prefix,$key,%Answer) = @_;
                    907:     my $returnvalue;
1.4       matthew   908:     if (exists($Answer{$key})) {
1.54      albertel  909: 	if (ref($Answer{$key}) eq 'HASH') {
                    910: 	    my $which = 'INTERNAL';
                    911: 	    if (!exists($Answer{$key}{$which})) {
                    912: 		$which = (sort(keys(%{ $Answer{$key} })))[0];
                    913: 	    }
                    914: 	    my $student_answer = $Answer{$key}{$which}[0][0];
                    915: 	    $returnvalue = $student_answer; 
                    916: 	} else {
                    917: 	    &Apache::lonnet::logthis("error analyzing problem. got a answer of type ".ref($Answer{$key}));
                    918: 	}
1.4       matthew   919:     } else {
                    920:         if (exists($Answer{$prefix.'.shown'})) {
                    921:             # The response has foils
                    922:             my %values;
                    923:             while (my ($k,$v) = each(%Answer)) {
                    924:                 next if ($k !~ /^$prefix\.foil\.(value|area)\.(.*)$/);
                    925:                 my $foilname = $2;
                    926:                 $values{$foilname}=$v;
                    927:             }
                    928:             foreach my $foil (@{$Answer{$prefix.'.shown'}}) {
                    929:                 if (ref($values{$foil}) eq 'ARRAY') {
1.10      albertel  930:                     $returnvalue.=&HTML::Entities::encode($foil,'<>&"').'='.
                    931:                         join(',',map {&HTML::Entities::encode($_,'<>&"')} @{$values{$foil}}).'&';
1.4       matthew   932:                 } else {
1.10      albertel  933:                     $returnvalue.=&HTML::Entities::encode($foil,'<>&"').'='.
                    934:                         &HTML::Entities::encode($values{$foil},'<>&"').'&';
1.4       matthew   935:                 }
                    936:             }
                    937:             $returnvalue =~ s/ /\%20/g;
                    938:             chop ($returnvalue);
                    939:         }
                    940:     }
                    941:     return $returnvalue;
                    942: }
1.8       matthew   943: 
                    944: #####################################################
                    945: #####################################################
                    946: 
                    947: =pod
                    948: 
                    949: =item Caching routines
                    950: 
                    951: =over 4
                    952: 
1.29      matthew   953: =item &load_analysis_cache($symb)
1.8       matthew   954: 
                    955: Loads the cache for the given symb into memory from disk.  
                    956: Requires the cache filename be set.  
                    957: Only should be called by &ensure_proper_cache.
                    958: 
                    959: =cut
                    960: 
                    961: #####################################################
                    962: #####################################################
                    963: {
                    964:     my $cache_filename = undef;
                    965:     my $current_symb = undef;
                    966:     my %cache;
                    967: 
1.29      matthew   968: sub load_analysis_cache {
1.8       matthew   969:     my ($symb) = @_;
                    970:     return if (! defined($cache_filename));
                    971:     if (! defined($current_symb) || $current_symb ne $symb) {
                    972:         undef(%cache);
                    973:         my $storedstring;
                    974:         my %cache_db;
                    975:         if (tie(%cache_db,'GDBM_File',$cache_filename,&GDBM_READER(),0640)) {
1.53      www       976:             $storedstring = $cache_db{&escape($symb)};
1.8       matthew   977:             untie(%cache_db);
                    978:         }
                    979:         if (defined($storedstring)) {
                    980:             %cache = %{thaw($storedstring)};
                    981:         }
                    982:     }
                    983:     return;
                    984: }
                    985: 
                    986: #####################################################
                    987: #####################################################
                    988: 
                    989: =pod
                    990: 
1.29      matthew   991: =item &get_from_analysis_cache($sname,$sdom,$symb,$partid,$respid)
1.8       matthew   992: 
                    993: Returns the appropriate data from the cache, or undef if no data exists.
                    994: 
                    995: =cut
                    996: 
                    997: #####################################################
                    998: #####################################################
1.29      matthew   999: sub get_from_analysis_cache {
                   1000:     my ($sname,$sdom,$symb) = @_;
1.8       matthew  1001:     &ensure_proper_cache($symb);
                   1002:     my $returnvalue;
1.29      matthew  1003:     if (exists($cache{$sname.':'.$sdom})) {
                   1004:         $returnvalue = $cache{$sname.':'.$sdom};
1.8       matthew  1005:     } else {
                   1006:         $returnvalue = undef;
                   1007:     }
                   1008:     return $returnvalue;
                   1009: }
                   1010: 
                   1011: #####################################################
                   1012: #####################################################
                   1013: 
                   1014: =pod
                   1015: 
1.29      matthew  1016: =item &write_analysis_cache($symb)
1.8       matthew  1017: 
                   1018: Writes the in memory cache to disk so that it can be read in with
1.29      matthew  1019: &load_analysis_cache($symb).
1.8       matthew  1020: 
                   1021: =cut
                   1022: 
                   1023: #####################################################
                   1024: #####################################################
1.29      matthew  1025: sub write_analysis_cache {
1.8       matthew  1026:     return if (! defined($current_symb) || ! defined($cache_filename));
                   1027:     my %cache_db;
1.53      www      1028:     my $key = &escape($current_symb);
1.8       matthew  1029:     if (tie(%cache_db,'GDBM_File',$cache_filename,&GDBM_WRCREAT(),0640)) {
                   1030:         my $storestring = freeze(\%cache);
                   1031:         $cache_db{$key}=$storestring;
                   1032:         $cache_db{$key.'.time'}=time;
                   1033:         untie(%cache_db);
                   1034:     }
                   1035:     undef(%cache);
                   1036:     undef($current_symb);
                   1037:     undef($cache_filename);
                   1038:     return;
                   1039: }
                   1040: 
                   1041: #####################################################
                   1042: #####################################################
                   1043: 
                   1044: =pod
                   1045: 
                   1046: =item &ensure_proper_cache($symb)
                   1047: 
                   1048: Called to make sure we have the proper cache set up.  This is called
1.29      matthew  1049: prior to every analysis lookup.
1.8       matthew  1050: 
                   1051: =cut
                   1052: 
                   1053: #####################################################
                   1054: #####################################################
                   1055: sub ensure_proper_cache {
                   1056:     my ($symb) = @_;
1.46      albertel 1057:     my $cid = $env{'request.course.id'};
1.67      foxr     1058:     my $new_filename = LONCAPA::tempdir() .
1.29      matthew  1059:         'problemanalysis_'.$cid.'_analysis_cache.db';
1.8       matthew  1060:     if (! defined($cache_filename) ||
                   1061:         $cache_filename ne $new_filename ||
                   1062:         ! defined($current_symb)   ||
                   1063:         $current_symb ne $symb) {
                   1064:         $cache_filename = $new_filename;
                   1065:         # Notice: $current_symb is not set to $symb until after the cache is
1.29      matthew  1066:         # loaded.  This is what tells &load_analysis_cache to load in a new
1.8       matthew  1067:         # symb cache.
1.29      matthew  1068:         &load_analysis_cache($symb);
1.8       matthew  1069:         $current_symb = $symb;
                   1070:     }
                   1071: }
                   1072: 
                   1073: #####################################################
                   1074: #####################################################
                   1075: 
                   1076: =pod
                   1077: 
1.29      matthew  1078: =item &store_analysis($sname,$sdom,$symb,$partid,$respid,$dataset)
1.8       matthew  1079: 
1.29      matthew  1080: Stores the analysis data in the in memory cache.
1.8       matthew  1081: 
                   1082: =cut
                   1083: 
                   1084: #####################################################
                   1085: #####################################################
1.29      matthew  1086: sub store_analysis {
                   1087:     my ($sname,$sdom,$symb,$dataset) = @_;
1.8       matthew  1088:     return if ($symb ne $current_symb);
1.29      matthew  1089:     $cache{$sname.':'.$sdom}=$dataset;
1.8       matthew  1090:     return;
                   1091: }
                   1092: 
                   1093: }
                   1094: #####################################################
                   1095: #####################################################
                   1096: 
                   1097: =pod
                   1098: 
                   1099: =back
                   1100: 
                   1101: =cut
                   1102: 
                   1103: #####################################################
                   1104: #####################################################
1.4       matthew  1105: 
                   1106: ##
                   1107: ## The following is copied from datecalc1.pl, part of the 
                   1108: ## Spreadsheet::WriteExcel CPAN module.
                   1109: ##
                   1110: ##
                   1111: ######################################################################
                   1112: #
                   1113: # Demonstration of writing date/time cells to Excel spreadsheets,
                   1114: # using UNIX/Perl time as source of date/time.
                   1115: #
                   1116: # Copyright 2000, Andrew Benham, adsb@bigfoot.com
                   1117: #
                   1118: ######################################################################
                   1119: #
                   1120: # UNIX/Perl time is the time since the Epoch (00:00:00 GMT, 1 Jan 1970)
                   1121: # measured in seconds.
                   1122: #
                   1123: # An Excel file can use exactly one of two different date/time systems.
                   1124: # In these systems, a floating point number represents the number of days
                   1125: # (and fractional parts of the day) since a start point. The floating point
                   1126: # number is referred to as a 'serial'.
                   1127: # The two systems ('1900' and '1904') use different starting points:
                   1128: #  '1900'; '1.00' is 1 Jan 1900 BUT 1900 is erroneously regarded as
                   1129: #          a leap year - see:
                   1130: #            http://support.microsoft.com/support/kb/articles/Q181/3/70.asp
                   1131: #          for the excuse^H^H^H^H^H^Hreason.
                   1132: #  '1904'; '1.00' is 2 Jan 1904.
                   1133: #
                   1134: # The '1904' system is the default for Apple Macs. Windows versions of
                   1135: # Excel have the option to use the '1904' system.
                   1136: #
                   1137: # Note that Visual Basic's "DateSerial" function does NOT erroneously
                   1138: # regard 1900 as a leap year, and thus its serials do not agree with
                   1139: # the 1900 serials of Excel for dates before 1 Mar 1900.
                   1140: #
                   1141: # Note that StarOffice (at least at version 5.2) does NOT erroneously
                   1142: # regard 1900 as a leap year, and thus its serials do not agree with
                   1143: # the 1900 serials of Excel for dates before 1 Mar 1900.
                   1144: #
                   1145: ######################################################################
                   1146: #
                   1147: # Calculation description
                   1148: # =======================
                   1149: #
                   1150: # 1900 system
                   1151: # -----------
                   1152: # Unix time is '0' at 00:00:00 GMT 1 Jan 1970, i.e. 70 years after 1 Jan 1900.
                   1153: # Of those 70 years, 17 (1904,08,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68)
                   1154: # were leap years with an extra day.
                   1155: # Thus there were 17 + 70*365 days = 25567 days between 1 Jan 1900 and
                   1156: # 1 Jan 1970.
                   1157: # In the 1900 system, '1' is 1 Jan 1900, but as 1900 was not a leap year
                   1158: # 1 Jan 1900 should really be '2', so 1 Jan 1970 is '25569'.
                   1159: #
                   1160: # 1904 system
                   1161: # -----------
                   1162: # Unix time is '0' at 00:00:00 GMT 1 Jan 1970, i.e. 66 years after 1 Jan 1904.
                   1163: # Of those 66 years, 17 (1904,08,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68)
                   1164: # were leap years with an extra day.
                   1165: # Thus there were 17 + 66*365 days = 24107 days between 1 Jan 1904 and
                   1166: # 1 Jan 1970.
                   1167: # In the 1904 system, 2 Jan 1904 being '1', 1 Jan 1970 is '24107'.
                   1168: #
                   1169: ######################################################################
                   1170: #
                   1171: # Copyright (c) 2000, Andrew Benham.
                   1172: # This program is free software. It may be used, redistributed and/or
                   1173: # modified under the same terms as Perl itself.
                   1174: #
                   1175: # Andrew Benham, adsb@bigfoot.com
                   1176: # London, United Kingdom
                   1177: # 11 Nov 2000
                   1178: #
                   1179: ######################################################################
                   1180: #-----------------------------------------------------------
                   1181: # calc_serial()
                   1182: #
                   1183: # Called with (up to) 2 parameters.
                   1184: #   1.  Unix timestamp.  If omitted, uses current time.
                   1185: #   2.  GMT flag. Set to '1' to return serial in GMT.
                   1186: #       If omitted, returns serial in appropriate timezone.
                   1187: #
                   1188: # Returns date/time serial according to $DATE_SYSTEM selected
                   1189: #-----------------------------------------------------------
                   1190: sub calc_serial {
                   1191:     # Use 1900 date system on all platforms other than Apple Mac (for which
                   1192:     # use 1904 date system).
                   1193:     my $DATE_SYSTEM = ($^O eq 'MacOS') ? 1 : 0;
                   1194:     my $time = (defined $_[0]) ? $_[0] : time();
                   1195:     my $gmtflag = (defined $_[1]) ? $_[1] : 0;
                   1196:     #
                   1197:     # Divide timestamp by number of seconds in a day.
                   1198:     # This gives a date serial with '0' on 1 Jan 1970.
                   1199:     my $serial = $time / 86400;
                   1200:     #
                   1201:     # Adjust the date serial by the offset appropriate to the
                   1202:     # currently selected system (1900/1904).
                   1203:     if ($DATE_SYSTEM == 0) {        # use 1900 system
                   1204:         $serial += 25569;
                   1205:     } else {                        # use 1904 system
                   1206:         $serial += 24107;
                   1207:     }
                   1208:     #
                   1209:     unless ($gmtflag) {
                   1210:         # Now have a 'raw' serial with the right offset. But this
                   1211:         # gives a serial in GMT, which is false unless the timezone
                   1212:         # is GMT. We need to adjust the serial by the appropriate
                   1213:         # timezone offset.
                   1214:         # Calculate the appropriate timezone offset by seeing what
                   1215:         # the differences between localtime and gmtime for the given
                   1216:         # time are.
                   1217:         #    
                   1218:         my @gmtime = gmtime($time);
                   1219:         my @ltime  = localtime($time);
                   1220:         #
                   1221:         # For the first 7 elements of the two arrays, adjust the
                   1222:         # date serial where the elements differ.
                   1223:         for (0 .. 6) {
                   1224:             my $diff = $ltime[$_] - $gmtime[$_];
                   1225:             if ($diff) {
                   1226:                 $serial += _adjustment($diff,$_);
                   1227:             }
                   1228:         }
                   1229:     }
                   1230:     #
                   1231:     # Perpetuate the error that 1900 was a leap year by decrementing
                   1232:     # the serial if we're using the 1900 system and the date is prior to
                   1233:     # 1 Mar 1900. This has the effect of making serial value '60'
                   1234:     # 29 Feb 1900.
                   1235:     #
                   1236:     # This fix only has any effect if UNIX/Perl time on the platform
                   1237:     # can represent 1900. Many can't.
                   1238:     #
                   1239:     unless ($DATE_SYSTEM) {
                   1240:         $serial-- if ($serial < 61);    # '61' is 1 Mar 1900
                   1241:     }
                   1242:     return $serial;
                   1243: }
                   1244: 
                   1245: sub _adjustment {
                   1246:     # Based on the difference in the localtime/gmtime array elements
                   1247:     # number, return the adjustment required to the serial.
                   1248:     #
                   1249:     # We only look at some elements of the localtime/gmtime arrays:
                   1250:     #    seconds    unlikely to be different as all known timezones
                   1251:     #               have an offset of integral multiples of 15 minutes,
                   1252:     #               but it's easy to do.
                   1253:     #    minutes    will be different for timezone offsets which are
                   1254:     #               not an exact number of hours.
                   1255:     #    hours      very likely to be different.
                   1256:     #    weekday    will differ when localtime/gmtime difference
                   1257:     #               straddles midnight.
                   1258:     #
                   1259:     # Assume that difference between localtime and gmtime is less than
                   1260:     # 5 days, then don't have to do maths for day of month, month number,
                   1261:     # year number, etc...
                   1262:     #
                   1263:     my ($delta,$element) = @_;
                   1264:     my $adjust = 0;
                   1265:     #
                   1266:     if ($element == 0) {            # Seconds
                   1267:         $adjust = $delta/86400;         # 60 * 60 * 24
                   1268:     } elsif ($element == 1) {       # Minutes
                   1269:         $adjust = $delta/1440;          # 60 * 24
                   1270:     } elsif ($element == 2) {       # Hours
                   1271:         $adjust = $delta/24;            # 24
                   1272:     } elsif ($element == 6) {       # Day of week number
                   1273:         # Catch difference straddling Sat/Sun in either direction
                   1274:         $delta += 7 if ($delta < -4);
                   1275:         $delta -= 7 if ($delta > 4);
                   1276:         #    
                   1277:         $adjust = $delta;
                   1278:     }
                   1279:     return $adjust;
                   1280: }
                   1281: 
                   1282: ###########################################################
                   1283: ###########################################################
                   1284: 
                   1285: =pod
                   1286: 
                   1287: =item get_problem_data
                   1288: 
                   1289: Returns a data structure describing the problem.
                   1290: 
                   1291: Inputs: $url
                   1292: 
                   1293: Returns: %Partdata
                   1294: 
                   1295: =cut
                   1296: 
                   1297: ## note: we must force each foil and option to not begin or end with
                   1298: ##       spaces as they are stored without such data.
                   1299: ##
                   1300: ###########################################################
                   1301: ###########################################################
                   1302: sub get_problem_data {
                   1303:     my ($url) = @_;
                   1304:     my $Answ=&Apache::lonnet::ssi($url,('grade_target' => 'analyze'));
                   1305:     (my $garbage,$Answ)=split(/_HASH_REF__/,$Answ,2);
                   1306:     my %Answer;
                   1307:     %Answer=&Apache::lonnet::str2hash($Answ);
                   1308:     my %Partdata;
                   1309:     foreach my $part (@{$Answer{'parts'}}) {
                   1310:         while (my($key,$value) = each(%Answer)) {
                   1311:             #
                   1312:             # Logging code:
1.7       matthew  1313:             if (0) {
1.4       matthew  1314:                 &Apache::lonnet::logthis($part.' got key "'.$key.'"');
                   1315:                 if (ref($value) eq 'ARRAY') {
                   1316:                     &Apache::lonnet::logthis('    @'.join(',',@$value));
                   1317:                 } else {
                   1318:                     &Apache::lonnet::logthis('    '.$value);
                   1319:                 }
                   1320:             }
                   1321:             # End of logging code
1.51      albertel 1322:             next if ($key !~ /^\Q$part\E/);
                   1323:             $key =~ s/^\Q$part\E\.//;
1.4       matthew  1324:             if (ref($value) eq 'ARRAY') {
                   1325:                 if ($key eq 'options') {
                   1326:                     $Partdata{$part}->{'_Options'}=$value;
                   1327:                 } elsif ($key eq 'concepts') {
                   1328:                     $Partdata{$part}->{'_Concepts'}=$value;
1.28      matthew  1329:                 } elsif ($key eq 'items') {
                   1330:                     $Partdata{$part}->{'_Items'}=$value;
1.4       matthew  1331:                 } elsif ($key =~ /^concept\.(.*)$/) {
                   1332:                     my $concept = $1;
                   1333:                     foreach my $foil (@$value) {
                   1334:                         $Partdata{$part}->{'_Foils'}->{$foil}->{'_Concept'}=
                   1335:                                                                       $concept;
                   1336:                     }
1.32      matthew  1337:                 } elsif ($key =~ /^(unit|incorrect|answer|ans_low|ans_high|str_type)$/) {
1.4       matthew  1338:                     $Partdata{$part}->{$key}=$value;
                   1339:                 }
                   1340:             } else {
                   1341:                 if ($key=~ /^foil\.text\.(.*)$/) {
                   1342:                     my $foil = $1;
                   1343:                     $Partdata{$part}->{'_Foils'}->{$foil}->{'name'}=$foil;
                   1344:                     $value =~ s/(\s*$|^\s*)//g;
                   1345:                     $Partdata{$part}->{'_Foils'}->{$foil}->{'text'}=$value;
                   1346:                 } elsif ($key =~ /^foil\.value\.(.*)$/) {
                   1347:                     my $foil = $1;
                   1348:                     $Partdata{$part}->{'_Foils'}->{$foil}->{'value'}=$value;
1.28      matthew  1349:                 } elsif ($key eq 'answercomputed') {
                   1350:                     $Partdata{$part}->{'answercomputed'} = $value;
1.4       matthew  1351:                 }
                   1352:             }
                   1353:         }
                   1354:     }
1.28      matthew  1355:     # Further debugging code
                   1356:     if (0) {
                   1357:         &Apache::lonnet::logthis('lonstathelpers::get_problem_data');
                   1358:         &log_hash_ref(\%Partdata);
                   1359:     }
1.4       matthew  1360:     return %Partdata;
1.5       matthew  1361: }
                   1362: 
1.28      matthew  1363: sub log_array_ref {
                   1364:     my ($arrayref,$prefix) = @_;
                   1365:     return if (ref($arrayref) ne 'ARRAY');
                   1366:     if (! defined($prefix)) { $prefix = ''; };
                   1367:     foreach my $v (@$arrayref) {
                   1368:         if (ref($v) eq 'ARRAY') {
                   1369:             &log_array_ref($v,$prefix.'  ');
                   1370:         } elsif (ref($v) eq 'HASH') {
                   1371:             &log_hash_ref($v,$prefix.'  ');
                   1372:         } else {
                   1373:             &Apache::lonnet::logthis($prefix.'"'.$v.'"');
                   1374:         }
                   1375:     }
                   1376: }
                   1377: 
                   1378: sub log_hash_ref {
                   1379:     my ($hashref,$prefix) = @_;
                   1380:     return if (ref($hashref) ne 'HASH');
                   1381:     if (! defined($prefix)) { $prefix = ''; };
                   1382:     while (my ($k,$v) = each(%$hashref)) {
                   1383:         if (ref($v) eq 'ARRAY') {
                   1384:             &Apache::lonnet::logthis($prefix.'"'.$k.'" = array');
                   1385:             &log_array_ref($v,$prefix.'  ');
                   1386:         } elsif (ref($v) eq 'HASH') {
                   1387:             &Apache::lonnet::logthis($prefix.'"'.$k.'" = hash');
                   1388:             &log_hash_ref($v,$prefix.'  ');
                   1389:         } else {
                   1390:             &Apache::lonnet::logthis($prefix.'"'.$k.'" => "'.$v.'"');
                   1391:         }
                   1392:     }
                   1393: }
1.5       matthew  1394: ####################################################
                   1395: ####################################################
                   1396: 
                   1397: =pod
                   1398: 
                   1399: =item &limit_by_time()
                   1400: 
                   1401: =cut
                   1402: 
                   1403: ####################################################
                   1404: ####################################################
                   1405: sub limit_by_time_form {
                   1406:     my $Starttime_form = '';
                   1407:     my $starttime = &Apache::lonhtmlcommon::get_date_from_form
                   1408:         ('limitby_startdate');
                   1409:     my $endtime = &Apache::lonhtmlcommon::get_date_from_form
                   1410:         ('limitby_enddate');
                   1411:     if (! defined($endtime)) {
                   1412:         $endtime = time;
                   1413:     }
                   1414:     if (! defined($starttime)) {
                   1415:         $starttime = $endtime - 60*60*24*7;
                   1416:     }
                   1417:     my $state;
                   1418:     if (&limit_by_time()) {
                   1419:         $state = '';
                   1420:     } else {
                   1421:         $state = 'disabled';
                   1422:     }
                   1423:     my $startdateform = &Apache::lonhtmlcommon::date_setter
                   1424:         ('Statistics','limitby_startdate',$starttime,undef,undef,$state);
                   1425:     my $enddateform = &Apache::lonhtmlcommon::date_setter
                   1426:         ('Statistics','limitby_enddate',$endtime,undef,undef,$state);
                   1427:     my $Str;
1.58      bisitz   1428:     $Str .= '<script type="text/javascript" language="JavaScript">';
1.5       matthew  1429:     $Str .= 'function toggle_limitby_activity(state) {';
                   1430:     $Str .= '    if (state) {';
                   1431:     $Str .= '        limitby_startdate_enable();';
                   1432:     $Str .= '        limitby_enddate_enable();';
                   1433:     $Str .= '    } else {';
                   1434:     $Str .= '        limitby_startdate_disable();';
                   1435:     $Str .= '        limitby_enddate_disable();';
                   1436:     $Str .= '    }';    
                   1437:     $Str .= '}';
                   1438:     $Str .= '</script>';
                   1439:     $Str .= '<fieldset>';
                   1440:     my $timecheckbox = '<input type="checkbox" name="limit_by_time" ';
                   1441:     if (&limit_by_time()) {
1.72      bisitz   1442:         $timecheckbox .= 'checked="checked" ';
1.5       matthew  1443:     } 
1.72      bisitz   1444:     $timecheckbox .= 'onchange="javascript:toggle_limitby_activity(this.checked);" ';
1.5       matthew  1445:     $timecheckbox .= ' />';
1.49      albertel 1446:     $Str .= '<legend><label>'.&mt('[_1] Limit by time',$timecheckbox).'</label></legend>';
1.5       matthew  1447:     $Str .= &mt('Start Time: [_1]',$startdateform).'<br />';
                   1448:     $Str .= &mt('&nbsp;End Time: [_1]',$enddateform).'<br />';
                   1449:     $Str .= '</fieldset>';
                   1450:     return $Str;
                   1451: }
                   1452: 
                   1453: sub limit_by_time {
1.46      albertel 1454:     if (exists($env{'form.limit_by_time'}) &&
                   1455:         $env{'form.limit_by_time'} ne '' ) {
1.5       matthew  1456:         return 1;
                   1457:     } else {
                   1458:         return 0;
                   1459:     }
                   1460: }
                   1461: 
                   1462: sub get_time_limits {
                   1463:     my $starttime = &Apache::lonhtmlcommon::get_date_from_form
                   1464:         ('limitby_startdate');
                   1465:     my $endtime = &Apache::lonhtmlcommon::get_date_from_form
                   1466:         ('limitby_enddate');
                   1467:     return ($starttime,$endtime);
1.11      matthew  1468: }
                   1469: 
1.2       matthew  1470: ####################################################
                   1471: ####################################################
                   1472: 
                   1473: =pod
                   1474: 
1.12      matthew  1475: =item &manage_caches
                   1476: 
                   1477: Inputs: $r, apache request object
                   1478: 
                   1479: Returns: An array of scalars containing html for buttons.
                   1480: 
                   1481: =cut
                   1482: 
                   1483: ####################################################
                   1484: ####################################################
                   1485: sub manage_caches {
1.23      matthew  1486:     my ($r,$formname,$inputname,$update_message) = @_;
1.12      matthew  1487:     &Apache::loncoursedata::clear_internal_caches();
1.16      matthew  1488:     my $sectionkey = 
                   1489:         join(',',
                   1490:              map {
1.53      www      1491:                      &escape($_);
1.44      matthew  1492:                  } sort(&Apache::lonstatistics::get_selected_sections())
1.16      matthew  1493:              );
                   1494:     my $statuskey = $Apache::lonstatistics::enrollment_status;
1.46      albertel 1495:     if (exists($env{'form.ClearCache'}) || 
                   1496:         exists($env{'form.updatecaches'}) || 
                   1497:         (exists($env{'form.firstrun'}) && $env{'form.firstrun'} ne 'no') ||
                   1498:         (exists($env{'form.prevsection'}) &&
                   1499:             $env{'form.prevsection'} ne $sectionkey) ||
                   1500:         (exists($env{'form.prevenrollstatus'}) &&
                   1501:             $env{'form.prevenrollstatus'} ne $statuskey)
1.16      matthew  1502:         ) {
1.23      matthew  1503:         if (defined($update_message)) {
                   1504:             $r->print($update_message);
                   1505:         }
1.40      matthew  1506:         if (0) {
                   1507:             &Apache::lonnet::logthis('Updating mysql student data caches');
                   1508:         }
1.36      matthew  1509:         &gather_full_student_data($r,$formname,$inputname);
1.12      matthew  1510:     }
                   1511:     #
1.16      matthew  1512:     my @Buttons = 
                   1513:         ('<input type="submit" name="ClearCache" '.
                   1514:              'value="'.&mt('Clear Caches').'" />',
                   1515:          '<input type="submit" name="updatecaches" '.
1.17      matthew  1516:              'value="'.&mt('Update Caches').'" />'.
                   1517:          &Apache::loncommon::help_open_topic('Statistics_Cache'),
1.16      matthew  1518:          '<input type="hidden" name="prevsection" value="'.$sectionkey.'" />',
                   1519:          '<input type="hidden" name="prevenrollstatus" value="'.$statuskey.'" />'
                   1520:          );
                   1521:     #
1.46      albertel 1522:     if (! exists($env{'form.firstrun'})) {
1.12      matthew  1523:         $r->print('<input type="hidden" name="firstrun" value="yes" />');
                   1524:     } else {
                   1525:         $r->print('<input type="hidden" name="firstrun" value="no" />');
                   1526:     }
                   1527:     #
                   1528:     return @Buttons;
                   1529: }
                   1530: 
1.36      matthew  1531: sub gather_full_student_data {
                   1532:     my ($r,$formname,$inputname) = @_;
                   1533:     my $status_type;
                   1534:     if (defined($formname)) {
                   1535:         $status_type = 'inline';
                   1536:     } else {
                   1537:         $status_type = 'popup';
                   1538:     }
                   1539:     my $c = $r->connection();
                   1540:     #
                   1541:     &Apache::loncoursedata::clear_internal_caches();
                   1542:     #
                   1543:     my @Students = @Apache::lonstatistics::Students;
                   1544:     #
                   1545:     # Open the progress window
1.68      www      1546:     my %prog_state=&Apache::lonhtmlcommon::Create_PrgWin($r,scalar(@Students));
1.36      matthew  1547:     #
                   1548:     while (my $student = shift @Students) {
                   1549:         return if ($c->aborted());
                   1550:         my $status = &Apache::loncoursedata::ensure_current_full_data
                   1551:             ($student->{'username'},$student->{'domain'},
1.46      albertel 1552:              $env{'request.course.id'});
1.36      matthew  1553:         &Apache::lonhtmlcommon::Increment_PrgWin($r,\%prog_state,
                   1554:                                                  &mt('last student'));
                   1555:     }
                   1556:     &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
                   1557:     $r->rflush();
                   1558:     return;
                   1559: }
1.12      matthew  1560: 
1.38      matthew  1561: ####################################################
                   1562: ####################################################
                   1563: 
                   1564: =pod
                   1565: 
                   1566: =item &submission_report_form
                   1567: 
                   1568: Input: The originating reportSelected value for the current stats page.
                   1569: 
                   1570: Output: Scalar containing HTML with needed form elements and a link to 
                   1571: the student submission reports page.
                   1572: 
                   1573: =cut
                   1574: 
                   1575: ####################################################
                   1576: ####################################################
                   1577: sub submission_report_form {
                   1578:     my ($original_report) = @_;
                   1579:     # Note: In the link below we change the reportSelected value.  If
                   1580:     # the user hits the 'back' button on the browser after getting their
                   1581:     # student submissions report, this value may still be around.  So we
                   1582:     # output a script block to set it properly.  If the $original_report
                   1583:     # value is unset, you are just asking for trouble.
                   1584:     if (! defined($original_report)) {
                   1585:         &Apache::lonnet::logthis
                   1586:             ('someone called lonstathelpers::submission_report_form without '.
                   1587:              ' enough input.');
                   1588:     }
                   1589:     my $html = $/.
1.58      bisitz   1590:         '<script type="text/javascript" language="JavaScript">'.
1.38      matthew  1591:         "document.Statistics.reportSelected.value='$original_report';".
                   1592:         '</script>'.
                   1593:         '<input type="hidden" name="correctans" value="true" />'.
                   1594:         '<input type="hidden" name="prob_status" value="true" />'.
                   1595:         '<input type="hidden" name="all_sub" value="true" />';
                   1596:     my $output_selector = $/.'<select name="output">'.$/;
                   1597:     foreach ('HTML','Excel','CSV') {
                   1598:         $output_selector .= '    <option value="'.lc($_).'"';
1.46      albertel 1599:         if ($env{'form.output'} eq lc($_)) {
1.38      matthew  1600:             $output_selector .= ' selected ';
                   1601:         }
                   1602:         $output_selector .='>'.&mt($_).'</option>'.$/;
                   1603:     } 
                   1604:     $output_selector .= '</select>'.$/;
                   1605:     my $link = '<a href="javascript:'.
                   1606:        q{document.Statistics.reportSelected.value='student_submission_reports';}.
                   1607:        'document.Statistics.submit();">';
                   1608:     $html.= &mt('View data as [_1] [_2]go[_3]',$output_selector,
                   1609:                 $link,'</a>').$/;
                   1610:     return $html
                   1611: }
1.12      matthew  1612: 
                   1613: ####################################################
                   1614: ####################################################
                   1615: 
                   1616: =pod
                   1617: 
1.2       matthew  1618: =back
                   1619: 
                   1620: =cut
                   1621: 
                   1622: ####################################################
                   1623: ####################################################
1.1       matthew  1624: 
                   1625: 1;
                   1626: 
                   1627: __END__

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