--- loncom/interface/statistics/lonproblemanalysis.pm	2003/11/11 22:07:46	1.48
+++ loncom/interface/statistics/lonproblemanalysis.pm	2004/01/19 18:55:10	1.58
@@ -1,6 +1,6 @@
 # The LearningOnline Network with CAPA
 #
-# $Id: lonproblemanalysis.pm,v 1.48 2003/11/11 22:07:46 matthew Exp $
+# $Id: lonproblemanalysis.pm,v 1.58 2004/01/19 18:55:10 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -42,14 +42,19 @@ my $plotcolors = ['#33ff00',
                   '#66ccff', '#ff9999', '#cccc33', '#660000', '#33cc66',
                   ]; 
 
-my @SubmitButtons = ({ name => 'ProblemAnalyis',
+my @SubmitButtons = ({ name => 'PrevProblemAnalysis',
+                       text => 'Previous Problem' },
+                     { name => 'ProblemAnalysis',
                        text => 'Analyze Problem Again' },
+                     { name => 'NextProblemAnalysis',
+                       text => 'Next Problem' },
+                     { name => 'break'},
                      { name => 'ClearCache',
                        text => 'Clear Caches' },
                      { name => 'updatecaches',
                        text => 'Update Student Data' },
                      { name => 'SelectAnother',
-                       text => 'Choose a different resource' },
+                       text => 'Choose a different Problem' },
                      { name => 'ExcelOutput',
                        text => 'Produce Excel Output' });
 
@@ -73,6 +78,19 @@ sub render_resource {
 sub BuildProblemAnalysisPage {
     my ($r,$c)=@_;
     #
+    my %Saveable_Parameters = ('Status' => 'scalar',
+                               'Section' => 'array',
+                               'NumPlots' => 'scalar',
+                               'AnalyzeAs' => 'scalar',
+                               'AnalyzeOver' => 'scalar',
+                               );
+    &Apache::loncommon::store_course_settings('problem_analysis',
+                                              \%Saveable_Parameters);
+    &Apache::loncommon::restore_course_settings('problem_analysis',
+                                                \%Saveable_Parameters);
+    #
+    &Apache::lonstatistics::PrepareClasslist();
+    #
     $r->print('<h2>'.&mt('Option Response Problem Analysis').'</h2>');
     $r->print(&CreateInterface());
     #
@@ -99,34 +117,54 @@ sub BuildProblemAnalysisPage {
     if (exists($ENV{'form.problemchoice'}) && 
         ! exists($ENV{'form.SelectAnother'})) {
         foreach my $button (@SubmitButtons) {
-            $r->print('<input type="submit" name="'.$button->{'name'}.'" '.
-                      'value="'.&mt($button->{'text'}).'" />');
-            $r->print('&nbsp;'x5);
+            if ($button->{'name'} eq 'break') {
+                $r->print("<br />\n");
+            } else {
+                $r->print('<input type="submit" name="'.$button->{'name'}.'" '.
+                          'value="'.&mt($button->{'text'}).'" />');
+                $r->print('&nbsp;'x5);
+            }
         }
-        $r->print('<input type="hidden" name="problemchoice" value="'.
-                  $ENV{'form.problemchoice'}.'" />');
         #
         $r->print('<hr />');
-        #
-        my ($symb,$part,$resid,$resptype) = &get_problem_symb(
-                  &Apache::lonnet::unescape($ENV{'form.problemchoice'}));
         $r->rflush();
         #
-        my $resource = &get_resource_from_symb($symb);
-        if (! defined($resource) || ! defined($resptype)) {
+        # Determine which problem we are to analyze
+        my $current_problem = &get_target_from_id($ENV{'form.problemchoice'});
+        #
+        my ($prev,$curr,$next) = &get_prev_curr_next($current_problem);
+        if (exists($ENV{'form.PrevProblemAnalysis'}) && defined($prev)) {
+            $current_problem = $prev;
+        } elsif (exists($ENV{'form.NextProblemAnalysis'}) && defined($next)) {
+            $current_problem = $next;
+        } else {
+            $current_problem = $curr;
+        }
+        #
+        # Store the current problem choice and send it out in the form
+        $ENV{'form.problemchoice'} = &make_target_id($current_problem);
+        $r->print('<input type="hidden" name="problemchoice" value="'.
+                  $ENV{'form.problemchoice'}.'" />');
+        #
+        if (! defined($current_problem->{'resource'})) {
             $r->print('resource is undefined');
         } else {
+            my $resource = $current_problem->{'resource'};
             $r->print('<h1>'.$resource->{'title'}.'</h1>');
             $r->print('<h3>'.$resource->{'src'}.'</h3>');
             $r->print(&render_resource($resource));
             $r->rflush();
             my %Data = &get_problem_data($resource->{'src'});
-            my $ProblemData = $Data{$part.'.'.$resid};
-            if ($resptype eq 'option') {
-                &OptionResponseAnalysis($r,$resource,$resid,$ProblemData,
+            my $ProblemData = $Data{$current_problem->{'part'}.
+                                    '.'.
+                                    $current_problem->{'respid'}};
+            if ($current_problem->{'resptype'} eq 'option') {
+                &OptionResponseAnalysis($r,$current_problem,
+                                        $ProblemData,
                                         \@Students);
-            } elsif ($resptype eq 'radiobutton') {
-                &RadioResponseAnalysis($r,$resource,$part,$resid,$ProblemData,
+            } elsif ($current_problem->{'resptype'} eq 'radiobutton') {
+                &RadioResponseAnalysis($r,$current_problem,
+                                       $ProblemData,
                                        \@Students);
             } else {
                 $r->print('<h2>This analysis is not supported</h2>');
@@ -142,9 +180,6 @@ sub BuildProblemAnalysisPage {
     }
 }
 
-=pod
-
-Removed code:
 
 #########################################################
 #########################################################
@@ -154,7 +189,9 @@ Removed code:
 #########################################################
 #########################################################
 sub RadioResponseAnalysis {
-    my ($r,$resource,$part,$respid,$ProblemData,$Students) = @_;
+    my ($r,$problem,$ProblemData,$Students) = @_;
+    my ($resource,$respid) = ($problem->{'resource'},
+                                    $problem->{'respid'});
     my $analysis_html;
     my $PerformanceData = 
         &Apache::loncoursedata::get_response_data
@@ -168,14 +205,14 @@ sub RadioResponseAnalysis {
         return;
     }
     if (exists($ENV{'form.ExcelOutput'})) {
-        $analysis_html .= &RR_Excel_output($r,$resource,$PerformanceData,
-                                          $ProblemData);
+        $analysis_html .= &RR_Excel_output($r,$problem->{'resource'},
+                                           $PerformanceData,$ProblemData);
     } elsif ($ENV{'form.AnalyzeOver'} eq 'Tries') {
-        $analysis_html .= &RR_Tries_Analysis($r,$resource,$PerformanceData,
-                                           $ProblemData);
+        $analysis_html .= &RR_Tries_Analysis($r,$problem->{'resource'},
+                                             $PerformanceData,$ProblemData);
     } elsif ($ENV{'form.AnalyzeOver'} eq 'Time') {
-        $analysis_html .= &RR_Time_Analysis($r,$resource,$PerformanceData,
-                                           $ProblemData);
+        $analysis_html .= &RR_Time_Analysis($r,$problem->{'resource'},
+                                            $PerformanceData,$ProblemData);
     } else {
         $analysis_html .= '<h2>'.
            &mt('The analysis you have selected is not supported at this time').
@@ -184,7 +221,6 @@ sub RadioResponseAnalysis {
     $r->print($analysis_html);
 }
 
-
 sub RR_Excel_output   { 
     my ($r,$PerformanceData,$ProblemData) = @_;
     return '<h1>No!</h1>';
@@ -196,7 +232,8 @@ sub RR_Tries_Analysis {
     my $mintries = 1;
     my $maxtries = $ENV{'form.NumPlots'};
     my ($table,$Foils,$Concepts) = &build_foil_index($ProblemData);
-    if ((@$Concepts < 2) && ($ENV{'form.AnalyzeAs'} ne 'Foils')) {
+    if ((! defined($Concepts)) || ((@$Concepts < 2) && 
+                                   ($ENV{'form.AnalyzeAs'} ne 'Foils'))) {
         $table = '<h3>'.
             &mt('Not enough data for concept analysis.  '.
                 'Performing Foil Analysis').
@@ -205,15 +242,15 @@ sub RR_Tries_Analysis {
     }
     $analysis_html .= $table;
     my @TryData = &RR_tries_data_analysis($r,$PerformanceData);
-    if ($ENV{'form.AnalyzeAs'} eq 'Foils') {
-        $analysis_html = &RR_Tries_Foil_Analysis($mintries,$maxtries,$Foils,
+#    if ($ENV{'form.AnalyzeAs'} eq 'Foils') {
+        $analysis_html .= &RR_Tries_Foil_Analysis($mintries,$maxtries,$Foils,
                                                  \@TryData,$ProblemData);
-    } else {
-        $analysis_html = &RR_Tries_Concept_Analysis($mintries,$maxtries,
-                                                    $Concepts,
-                                                    \@TryData,
-                                                    $ProblemData);
-    }
+#    } else {
+#        $analysis_html = &RR_Tries_Concept_Analysis($mintries,$maxtries,
+#                                                    $Concepts,
+#                                                    \@TryData,
+#                                                    $ProblemData);
+#    }
     return $analysis_html;
 }
 
@@ -243,8 +280,8 @@ sub RR_Tries_Foil_Analysis {
         my @PlotData_Correct; 
         my @PlotData_Incorrect;
         next if ($try > scalar(@{$TryData}));
-        next if (! defined($TryData->[$try-1]));
-        my %DataSet = %{$TryData->[$try-1]};
+        next if (! defined($TryData->[$try]));
+        my %DataSet = %{$TryData->[$try]};
         my $total = 0;
         foreach my $foilid (@$Foils) {
             $total += $DataSet{$foilid};
@@ -275,7 +312,6 @@ sub RR_Tries_Foil_Analysis {
                                                   \@PlotData_Correct,
                                                   \@PlotData_Incorrect);
     }
-    &Apache::lonnet::logthis('plot = '.$html);
     return $html;
 }
 
@@ -298,14 +334,12 @@ sub RR_Time_Concept_Analysis {
 }
 
 
-
 sub get_Radio_problem_data {
     my ($url) = @_;
     my $Answ=&Apache::lonnet::ssi($url,('grade_target' => 'analyze'));
     (my $garbage,$Answ)=split('_HASH_REF__',$Answ,2);
     my %Answer = &Apache::lonnet::str2hash($Answ);
     my %Partdata;
-    &Apache::lonnet::logthis('url = '.$url);
     foreach my $part (@{$Answer{'parts'}}) {
         while (my($key,$value) = each(%Answer)) {
 #            if (ref($value) eq 'ARRAY') {
@@ -331,9 +365,6 @@ sub get_Radio_problem_data {
     return %Partdata;
 }
 
-=cut
-
-
 #########################################################
 #########################################################
 ##
@@ -342,10 +373,13 @@ sub get_Radio_problem_data {
 #########################################################
 #########################################################
 sub OptionResponseAnalysis {
-    my ($r,$resource,$resid,$ProblemData,$Students) = @_;
+    my ($r,$problem,$ProblemData,$Students) = @_;
+    my ($resource,$respid) = ($problem->{'resource'},
+                              $problem->{'respid'});
+    # Note: part data is not needed.
     my $PerformanceData = 
         &Apache::loncoursedata::get_response_data
-        ($Students,$resource->{'symb'},$resid);
+        ($Students,$resource->{'symb'},$respid);
     if (! defined($PerformanceData) || 
         ref($PerformanceData) ne 'ARRAY' ) {
         $r->print('<h2>'.
@@ -354,20 +388,20 @@ sub OptionResponseAnalysis {
     }  else {
         $r->rflush();
         if (exists($ENV{'form.ExcelOutput'})) {
-            my $result = &prepare_optionresponse_excel_sheet($r,$resource,
-                                                             $PerformanceData,
-                                                             $ProblemData);
+            my $result = &OR_excel_sheet($r,$resource,
+                                         $PerformanceData,
+                                         $ProblemData);
             $r->print($result);
             $r->rflush();
         } else {
             if ($ENV{'form.AnalyzeOver'} eq 'Tries') {
-                my $analysis_html = &tries_analysis($r,
+                my $analysis_html = &OR_tries_analysis($r,
                                                     $PerformanceData,
                                                     $ProblemData);
                 $r->print($analysis_html);
                 $r->rflush();
             } elsif ($ENV{'form.AnalyzeOver'} eq 'Time') {
-                my $analysis_html = &time_analysis($PerformanceData,
+                my $analysis_html = &OR_time_analysis($PerformanceData,
                                                    $ProblemData);
                 $r->print($analysis_html);
                 $r->rflush();
@@ -386,7 +420,7 @@ sub OptionResponseAnalysis {
 #       Option Response:  Tries Analysis
 #
 #########################################################
-sub tries_analysis {
+sub OR_tries_analysis {
     my ($r,$PerformanceData,$ORdata) = @_;
     my $mintries = 1;
     my $maxtries = $ENV{'form.NumPlots'};
@@ -398,21 +432,21 @@ sub tries_analysis {
             '</h3>'.$table;
         $ENV{'form.AnalyzeAs'} = 'Foils';
     }
-    my %ResponseData = &analyze_option_data_by_tries($r,$PerformanceData,
+    my %ResponseData = &OR_analyze_by_tries($r,$PerformanceData,
                                                      $mintries,$maxtries);
     my $analysis = '';
     if ($ENV{'form.AnalyzeAs'} eq 'Foils') {
-        $analysis = &Tries_Foil_Analysis($mintries,$maxtries,$Foils,
+        $analysis = &OR_Tries_Foil_Analysis($mintries,$maxtries,$Foils,
                                          \%ResponseData,$ORdata);
     } else {
-        $analysis = &Tries_Concept_Analysis($mintries,$maxtries,
+        $analysis = &OR_Tries_Concept_Analysis($mintries,$maxtries,
                                             $Concepts,\%ResponseData,$ORdata);
     }
     $table .= $analysis;
     return $table;
 }
 
-sub Tries_Foil_Analysis {
+sub OR_Tries_Foil_Analysis {
     my ($mintries,$maxtries,$Foils,$respdat,$ORdata) = @_;
     my %ResponseData = %$respdat;
     #
@@ -471,6 +505,7 @@ sub Tries_Foil_Analysis {
         $analysis_html.= '<tr><td>'.$correctgraph.'</td>';
         ##
         ##
+        next if (! defined($Datasets[0]));
         for (my $i=0; $i< scalar(@{$Datasets[0]});$i++) {
             $Datasets[0]->[$i]=0;
         }
@@ -493,7 +528,7 @@ sub Tries_Foil_Analysis {
     return $analysis_html;
 }
 
-sub Tries_Concept_Analysis {
+sub OR_Tries_Concept_Analysis {
     my ($mintries,$maxtries,$Concepts,$respdat,$ORdata) = @_;
     my %ResponseData = %$respdat;
     my $analysis_html = "<table>\n";
@@ -559,7 +594,7 @@ sub Tries_Concept_Analysis {
     return $analysis_html;
 }
 
-sub analyze_option_data_by_tries {
+sub OR_analyze_by_tries {
     my ($r,$PerformanceData,$mintries,$maxtries) = @_;
     my %Trydata;
     $mintries = 1         if (! defined($mintries) || $mintries < 1);
@@ -587,7 +622,7 @@ sub analyze_option_data_by_tries {
 #     Option Response: Time Analysis
 #
 #########################################################
-sub time_analysis {
+sub OR_time_analysis {
     my ($PerformanceData,$ORdata) = @_;
     my ($table,$Foils,$Concepts) = &build_foil_index($ORdata);
     if ((@$Concepts < 2) && ($ENV{'form.AnalyzeAs'} ne 'Foils')) {
@@ -645,10 +680,10 @@ sub time_analysis {
             enddateform   => $enddateform,
         };
         if ($ENV{'form.AnalyzeAs'} eq 'Foils') {
-            $table .= &Foil_Time_Analysis($PerformanceData,$ORdata,$Foils,
+            $table .= &OR_Foil_Time_Analysis($PerformanceData,$ORdata,$Foils,
                                           $interval);
         } else {
-            $table .= &Concept_Time_Analysis($PerformanceData,$ORdata,
+            $table .= &OR_Concept_Time_Analysis($PerformanceData,$ORdata,
                                              $Concepts,$interval);
         }
     }
@@ -656,7 +691,7 @@ sub time_analysis {
     return $table;
 }
 
-sub Foil_Time_Analysis {
+sub OR_Foil_Time_Analysis {
     my ($PerformanceData,$ORdata,$Foils,$interval) = @_;
     my $analysis_html;
     my $foilkey = &build_option_index($ORdata);
@@ -751,7 +786,7 @@ sub Foil_Time_Analysis {
     return $analysis_html;
 }
 
-sub Concept_Time_Analysis {
+sub OR_Concept_Time_Analysis {
     my ($PerformanceData,$ORdata,$Concepts,$interval) = @_;
     my $analysis_html;
     ##
@@ -819,7 +854,7 @@ sub Concept_Time_Analysis {
 ##
 #########################################################
 #########################################################
-sub prepare_optionresponse_excel_sheet {
+sub OR_excel_sheet {
     my ($r,$resource,$PerformanceData,$ORdata) = @_;
     my $response = '';
     my (undef,$Foils,$Concepts) = &build_foil_index($ORdata);
@@ -891,7 +926,7 @@ sub prepare_optionresponse_excel_sheet {
     return $result;
 }
 
-sub build_problem_data_worksheet {
+sub OR_build_problem_data_worksheet {
     my ($worksheet,$format,$Concepts,$ORdata) = @_;
     my $rows_output = 3;
     my $cols_output = 0;
@@ -960,7 +995,7 @@ sub build_problem_data_worksheet {
     return 'okay';
 }
 
-sub build_student_data_worksheet {
+sub OR_build_student_data_worksheet {
     my ($worksheet,$format) = @_;
     my $rows_output = 3;
     my $cols_output = 0;
@@ -986,7 +1021,7 @@ sub build_student_data_worksheet {
     return;
 }
 
-sub build_response_data_worksheet {
+sub OR_build_response_data_worksheet {
     my ($worksheet,$format,$PerformanceData,$Foils,$ORdata)=@_;
     my $rows_output = 3;
     my $cols_output = 0;
@@ -1236,16 +1271,24 @@ sub build_foil_index {
                        ten   => 10,);
         my $a1 = lc($a); 
         my $b1 = lc($b);
-        if (exists($Numbers{$a})) {
-            $a1 = $Numbers{$a};
+        if (exists($Numbers{$a1})) {
+            $a = $Numbers{$a1};
+        }
+        if (exists($Numbers{$b1})) {
+            $b = $Numbers{$b1};
         }
-        if (exists($Numbers{$b})) {
-            $b1 = $Numbers{$b};
+        if (($a =~/^\d+$/) && ($b =~/^\d+$/)) {
+            return $a <=> $b;
+        } else {
+            return $a cmp $b;
         }
-        $a1 cmp $b1;
     };
     my @Concepts;
     foreach my $concept (sort $sortfunction (keys(%Concepts))) {
+        if (! defined($Concepts{$concept})) {
+            $Concepts{$concept}=[];
+#            next;
+        }
         push(@Concepts,{ name => $concept,
                         foils => [@{$Concepts{$concept}}]});
         push(@Foils,(@{$Concepts{$concept}}));
@@ -1390,6 +1433,8 @@ sub CreateInterface {
     { # These braces are here to organize the code, not scope it.
         {
             $Str .= '<nobr>'.&mt('Analyze Over ');
+            $Str .= &Apache::loncommon::help_open_topic
+                                                  ('Analysis_Analyze_Over');
             $Str .='<select name="AnalyzeOver" >';
             $Str .= '<option value="Tries" ';
             if (! exists($ENV{'form.AnalyzeOver'}) || 
@@ -1401,10 +1446,13 @@ sub CreateInterface {
             $Str .= '<option value="Time" ';
             $Str .= ' selected ' if ($ENV{'form.AnalyzeOver'} eq 'Time');
             $Str .= '>'.&mt('Time').'</option>';
-            $Str .= '</select></nobr><br />';
+            $Str .= '</select>';
+            $Str .= '</nobr><br />';
         }
         {
             $Str .= '<nobr>'.&mt('Analyze as ');
+            $Str .= &Apache::loncommon::help_open_topic
+                                                  ('Analysis_Analyze_as');
             $Str .='<select name="AnalyzeAs" >';
             $Str .= '<option value="Concepts" ';
             if (! exists($ENV{'form.AnalyzeAs'}) || 
@@ -1420,6 +1468,8 @@ sub CreateInterface {
         }
         {
             $Str .= '<br /><nobr>'.&mt('Number of Plots:');
+            $Str .= &Apache::loncommon::help_open_topic
+                                                  ('Analysis_num_plots');
             $Str .= '<select name="NumPlots">';
             if (! exists($ENV{'form.NumPlots'}) 
                 || $ENV{'form.NumPlots'} < 1 
@@ -1469,19 +1519,25 @@ sub ProblemSelector {
                 for (my $i=0;$i<scalar(@{$partdata->{'ResponseTypes'}});$i++){
                     my $respid = $partdata->{'ResponseIds'}->[$i];
                     my $resptype = $partdata->{'ResponseTypes'}->[$i];
-                    if ($resptype eq 'option' ){
-#                    if ($resptype eq 'option' || $resptype eq 'radiobutton') {
-                        my $value = 
-                            &Apache::lonnet::escape($res->{'symb'}.':'.$part.
-                                                    ':'.$respid.':'.$resptype);
+#                    if ($resptype eq 'option' ){
+                    if ($resptype eq 'option' || $resptype eq 'radiobutton') {
+                        my $value = &make_target_id({symb=>$res->{'symb'},
+                                                     part=>$part,
+                                                     respid=>$respid,
+                                                     resptype=>$resptype});
                         my $checked = '';
                         if ($ENV{'form.problemchoice'} eq $value) {
                             $checked = 'checked ';
                         }
+                        my $title = $res->{'title'};
+                        if (! defined($title) || $title eq '') {
+                            ($title) = ($res->{'src'} =~ m:/([^/]*)$:);
+                        }
                         $seq_str .= '<tr><td>'.
   '<input type="radio" name="problemchoice" value="'.$value.'" '.$checked.'/>'.
-  '</td><td>'.
-  '<a href="'.$res->{'src'}.'">'.$res->{'title'}.'</a> ';
+  '</td><td>'.          
+  $resptype.'</td><td>'.
+  '<a href="'.$res->{'src'}.'">'.$title.'</a> ';
 #  '<a href="'.$res->{'src'}.'">'.$resptype.' '.$res->{'title'}.'</a> ';
                         if ($partdata->{'option'} > 1) {
                             $seq_str .= &mt('response').' '.$respid;
@@ -1492,7 +1548,7 @@ sub ProblemSelector {
             }
         }
         if ($seq_str ne '') {
-            $Str .= '<tr><td>&nbsp</td><td><b>'.$seq->{'title'}.'</b></td>'.
+            $Str .= '<tr><td>&nbsp</td><td colspan="2"><b>'.$seq->{'title'}.'</b></td>'.
                 "</tr>\n".$seq_str;
         }
     }
@@ -1509,9 +1565,11 @@ sub ProblemSelector {
 #########################################################
 sub get_problem_symb {
     my $problemstring = shift();
-    my ($symb,$partid,$resid,$resptype) = 
-        ($problemstring=~ /^(.*):([^:]*):([^:]*):([^:]*)$/);
-    return ($symb,$partid,$resid,$resptype);
+    my ($symb,$partid,$respid,$resptype) = split(':',$problemstring);
+    return ({ symb   => $symb,
+              part   => $partid,
+              respid => $respid,
+              type   => $resptype } );
 }
 
 sub get_resource_from_symb {
@@ -1526,6 +1584,87 @@ sub get_resource_from_symb {
     return undef;
 }
 
+sub get_prev_curr_next {
+    my ($target) = @_;
+    #
+    # Build an array with the data we need to search through
+    my @Resource;
+    foreach my $seq (&Apache::lonstatistics::Sequences_with_Assess()) {
+        foreach my $res (@{$seq->{'contents'}}) {
+            next if ($res->{'type'} ne 'assessment');
+            foreach my $part (@{$res->{'parts'}}) {
+                my $partdata = $res->{'partdata'}->{$part};
+                for (my $i=0;$i<scalar(@{$partdata->{'ResponseTypes'}});$i++){
+                    my $respid = $partdata->{'ResponseIds'}->[$i];
+                    my $resptype = $partdata->{'ResponseTypes'}->[$i];
+                    next if ($resptype ne 'option' && 
+                             $resptype ne 'radiobutton');
+                    push (@Resource,
+                            { symb     => $res->{symb},
+                              part     => $part,
+                              respid   => $partdata->{'ResponseIds'}->[$i],
+                              resource => $res,
+                              resptype => $resptype
+                            } );
+                }
+            }
+        }
+    }
+    #
+    #
+    # Get the index of the current situation
+    my $curr_idx;
+    for ($curr_idx=0;$curr_idx<$#Resource;$curr_idx++) {
+        my $curr_item = $Resource[$curr_idx];
+        last if ($curr_item->{'symb'} eq $target->{'symb'} &&
+                 $curr_item->{'part'} eq $target->{'part'} &&
+                 $curr_item->{'respid'} eq $target->{'respid'} &&
+                 $curr_item->{'resptype'} eq $target->{'resptype'});
+    }
+    my $curr_item = $Resource[$curr_idx];
+    if ($curr_item->{'symb'}     ne $target->{'symb'} ||
+        $curr_item->{'part'}     ne $target->{'part'} ||
+        $curr_item->{'respid'}   ne $target->{'respid'} ||
+        $curr_item->{'resptype'} ne $target->{'resptype'}){
+        # bogus symb - return nothing
+        return (undef,undef,undef);
+    }
+    #
+    # Now just pick up the data we need
+    my ($prev,$curr,$next);
+    if ($curr_idx == 0) {
+        $prev = undef;
+        $curr = $Resource[$curr_idx  ];
+        $next = $Resource[$curr_idx+1];
+    } elsif ($curr_idx == $#Resource) {
+        $prev = $Resource[$curr_idx-1];
+        $curr = $Resource[$curr_idx  ];
+        $next = undef;
+    } else {
+        $prev = $Resource[$curr_idx-1];
+        $curr = $Resource[$curr_idx  ];
+        $next = $Resource[$curr_idx+1];
+    }
+    return ($prev,$curr,$next);
+}
+
+sub make_target_id {
+    my ($target) = @_;
+    my $id = &Apache::lonnet::escape($target->{'symb'}).':'.
+             &Apache::lonnet::escape($target->{'part'}).':'.
+             &Apache::lonnet::escape($target->{'respid'}).':'.
+             &Apache::lonnet::escape($target->{'resptype'});
+    return $id;
+}
+
+sub get_target_from_id {
+    my ($id) = @_;
+    my ($symb,$part,$respid,$resptype) = split(':',$id);
+    return ({ symb    =>&Apache::lonnet::unescape($symb),
+             part     =>&Apache::lonnet::unescape($part),
+             respid   =>&Apache::lonnet::unescape($respid),
+             resptype =>&Apache::lonnet::unescape($resptype)});
+}
 
 #########################################################
 #########################################################
@@ -1578,6 +1717,7 @@ sub Process_OR_Row {
     my @Foilsubs   = split('&',$submission);
     for (my $j=0;$j<=$#Foilgrades;$j++) {
         my ($foilid,$correct)  = split('=',$Foilgrades[$j]);
+        $foilid = &Apache::lonnet::unescape($foilid);
         my (undef,$submission) = split('=',$Foilsubs[$j]);
         if ($correct) {
             $RowData{$foilid}->{'_correct'}++;