--- loncom/interface/Attic/lonspreadsheet.pm	2002/11/07 15:37:02	1.135
+++ loncom/interface/Attic/lonspreadsheet.pm	2002/11/21 19:26:34	1.147
@@ -1,5 +1,5 @@
 #
-# $Id: lonspreadsheet.pm,v 1.135 2002/11/07 15:37:02 matthew Exp $
+# $Id: lonspreadsheet.pm,v 1.147 2002/11/21 19:26:34 matthew Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -53,17 +53,18 @@ built-in functions.
 package Apache::lonspreadsheet;
             
 use strict;
+use Apache::Constants qw(:common :http);
+use Apache::lonnet;
+use Apache::lonhtmlcommon;
+use Apache::loncoursedata;
+use Apache::File();
 use Safe;
 use Safe::Hole;
 use Opcode;
-use Apache::lonnet;
-use Apache::Constants qw(:common :http);
 use GDBM_File;
 use HTML::TokeParser;
-use Apache::lonhtmlcommon;
-use Apache::loncoursedata;
-use Apache::File();
 use Spreadsheet::WriteExcel;
+
 #
 # Caches for coursewide information 
 #
@@ -93,7 +94,7 @@ my %spreadsheets;
 my %courserdatas;
 my %userrdatas;
 my %defaultsheets;
-my %updatedata;
+my %rowlabel_cache;
 
 #
 # These global hashes are dependent on user, course and resource, 
@@ -1085,6 +1086,44 @@ sub geterrorlog {
     return ${$sheet->{'safe'}->varglob('errorlog')};    
 }
 
+sub gettitle {
+    my $sheet = shift;
+    if ($sheet->{'sheettype'} eq 'classcalc') {
+        return $sheet->{'coursedesc'};
+    } elsif ($sheet->{'sheettype'} eq 'studentcalc') {
+        return 'Grades for '.$sheet->{'uname'}.'@'.$sheet->{'udom'};
+    } elsif ($sheet->{'sheettype'} eq 'assesscalc') {
+        if (($sheet->{'usymb'} eq '_feedback') ||
+            ($sheet->{'usymb'} eq '_evaluation') ||
+            ($sheet->{'usymb'} eq '_discussion') ||
+            ($sheet->{'usymb'} eq '_tutoring')) {
+            my $title = $sheet->{'usymb'};
+            $title =~ s/^_//;
+            $title = ucfirst($title);
+            return $title;
+        }
+        return if (! defined($sheet->{'mapid'}) || 
+                   $sheet->{'mapid'} !~ /^\d+$/);
+        my $mapid = $sheet->{'mapid'};
+        return if (! defined($sheet->{'resid'}) || 
+                   $sheet->{'resid'} !~ /^\d+$/);
+        my $resid = $sheet->{'resid'};
+        my %course_db;
+        tie(%course_db,'GDBM_File',$sheet->{'coursefilename'}.'.db',
+            &GDBM_READER(),0640);
+        return if (! tied(%course_db));
+        my $key = 'title_'.$mapid.'.'.$resid;
+        my $title = '';
+        if (exists($course_db{$key})) {
+            $title = $course_db{$key};
+        } else {
+            $title = $sheet->{'usymb'};
+        }
+        untie (%course_db);
+        return $title;
+    }
+}
+
 # ----------------------------------------------------- Get value of $f{'A'.$n}
 sub getfa {
     my $sheet = shift;
@@ -1107,6 +1146,22 @@ sub exportdata {
     return @exportarray;
 }
 
+
+
+sub update_student_sheet{
+    my ($sheet,$r,$c) = @_;
+    # Load in the studentcalc sheet
+    &readsheet($sheet,'default_studentcalc');
+    # Determine the structure (contained assessments, etc) of the sheet
+    &updatesheet($sheet);
+    # Load in the cached sheets for this student
+    &cachedssheets($sheet);
+    # Load in the (possibly cached) data from the assessment sheets        
+    &loadstudent($sheet,$r,$c);
+    # Compute the sheet
+    &calcsheet($sheet);
+}
+
 # ========================================================== End of Spreadsheet
 # =============================================================================
 #
@@ -1131,16 +1186,45 @@ sub get_row {
 ########################################################################
 sub sort_indicies {
     my $sheet = shift;
-    #
-    # Sort the rows in some manner
-    #
-    my @sortby=();
     my @sortidx=();
-    for (my $row=1;$row<=$sheet->{'maxrow'};$row++) {
-        push (@sortby, $sheet->{'safe'}->reval('$f{"A'.$row.'"}'));
-        push (@sortidx, $row);
+    #
+    if ($sheet->{'sheettype'} eq 'classcalc') {
+        my @sortby=(undef);
+        # Skip row 0
+        for (my $row=1;$row<=$sheet->{'maxrow'};$row++) {
+            my (undef,$sname,$sdom,$fullname,$section,$id) = 
+                split(':',$sheet->{'rowlabel'}->{$sheet->{'f'}->{'A'.$row}});
+            push (@sortby, lc($fullname));
+            push (@sortidx, $row);
+        }
+        @sortidx = sort { $sortby[$a] cmp $sortby[$b]; } @sortidx;
+    } elsif ($sheet->{'sheettype'} eq 'studentcalc') {
+        my @sortby1=(undef);
+        my @sortby2=(undef);
+        # Skip row 0
+        for (my $row=1;$row<=$sheet->{'maxrow'};$row++) {
+            my (undef,$symb,$uname,$udom,$mapid,$resid,$title) = 
+                split(':',$sheet->{'rowlabel'}->{$sheet->{'f'}->{'A'.$row}});
+            $symb = &Apache::lonnet::unescape($symb);
+            my ($sequence) = ($symb =~ /\/([^\/]*\.sequence)/);
+            if ($sequence eq '') {
+                $sequence = $symb;
+            }
+            push (@sortby1, $sequence);
+            push (@sortby2, $title);
+            push (@sortidx, $row);
+        }
+        @sortidx = sort { $sortby1[$a] cmp $sortby1[$b] || 
+                              $sortby2[$a] cmp $sortby2[$b] } @sortidx;
+    } else {
+        my @sortby=(undef);
+        # Skip row 0
+        for (my $row=1;$row<=$sheet->{'maxrow'};$row++) {
+            push (@sortby, $sheet->{'safe'}->reval('$f{"A'.$row.'"}'));
+            push (@sortidx, $row);
+        }
+        @sortidx = sort { $sortby[$a] cmp $sortby[$b]; } @sortidx;
     }
-    @sortidx=sort { lc($sortby[$a]) cmp lc($sortby[$b]); } @sortidx;
     return @sortidx;
 }
 
@@ -1173,6 +1257,7 @@ sub html_editable_cell {
     if ($value =~ /^\s*$/ ) {
         $value = '<font color="'.$bgcolor.'">#</font>';
     }
+    $formula =~ s/\n/\\n/gs;
     $result .= '<a href="javascript:celledit(\''.
         $name.'\',\''.$formula.'\');">'.$value.'</a>';
     return $result;
@@ -1250,7 +1335,6 @@ END
     # Print out summary/export row
     ####################################
     my ($rowlabel,@rowdata) = &get_row($sheet,'0');
-    my $rowcount = 0;
     $row_html = '<tr><td>'.&format_html_rowlabel($rowlabel).'</td>';
     $num_cols_output = 0;
     foreach my $cell (@rowdata) {
@@ -1275,6 +1359,21 @@ END
     my $rows_output=0;
     foreach my $rownum (@Rows) {
         my ($rowlabel,@rowdata) = &get_row($sheet,$rownum);
+        next if ($rowlabel =~ /^\s*$/);
+        next if (($sheet->{'sheettype'} eq 'assesscalc') && 
+                 (! $ENV{'form.showall'})                &&
+                 ($rowdata[0]->{'value'} =~ /^\s*$/));
+        if (! $ENV{'form.showall'} &&
+            $sheet->{'sheettype'} =~ /^(studentcalc|classcalc)$/) {
+            my $row_is_empty = 1;
+            foreach my $cell (@rowdata) {
+                if ($cell->{'value'} !~  /^\s*$/) {
+                    $row_is_empty = 0;
+                    last;
+                }
+            }
+            next if ($row_is_empty);
+        }
         #
         my $defaultbg='#E0FF';
         #
@@ -1369,6 +1468,7 @@ sub outsheet_csv   {
     my $rows_output=0;
     foreach my $rownum (@Rows) {
         my ($rowlabel,@rowdata) = &get_row($sheet,$rownum);
+        next if ($rowlabel =~ /^\s*$/);
         push (@Values,&format_csv_rowlabel($rowlabel));
         foreach my $cell (@rowdata) {
             push (@Values,'"'.$cell->{'value'}.'"');
@@ -1404,6 +1504,7 @@ sub outsheet_csv   {
 ############################################
 sub outsheet_recursive_excel {
     my ($sheet,$r) = @_;
+    my $c = $r->connection;
     return undef if ($sheet->{'sheettype'} ne 'classcalc');
     my ($workbook,$filename) = &create_excel_spreadsheet($sheet,$r);
     return undef if (! defined($workbook));
@@ -1414,42 +1515,59 @@ sub outsheet_recursive_excel {
     # Figure out who the students are
     my %f=&getformulas($sheet);
     my $count = 0;
-    $r->print("<br />\n");
+    $r->print(<<END);
+<p>
+Compiling Excel Workbook with a worksheet for each student.
+</p><p>
+This operation may take longer than a complete recalculation of the
+spreadsheet. 
+</p><p>
+To abort this operation, hit the stop button on your browser.
+</p><p>
+A link to the spreadsheet will be available at the end of this process.
+</p>
+<p>
+END
     $r->rflush();
-    foreach (keys(%f)) {
-	next if ($_!~/^A(\d+)/ || $1 == 0 || ($f{$_}=~/^[!~-]/));
+    my $starttime = time;
+    foreach my $rownum (&sort_indicies($sheet)) {
         $count++;
-        my ($sname,$sdom) = split(':',$f{$_});
+        my ($sname,$sdom) = split(':',$f{'A'.$rownum});
         my $student_excel_worksheet=$workbook->addworksheet($sname.'@'.$sdom);
         # Create a new spreadsheet
         my $studentsheet = &makenewsheet($sname,$sdom,'studentcalc',undef);
         # Read in the spreadsheet definition
-        &readsheet($studentsheet,'default_studentcalc');
-        # Determine the structure (contained assessments, etc) of the sheet
-        &updatesheet($studentsheet);
-        # Load in the (possibly cached) data from the assessment sheets        
-        &loadrows($studentsheet);
-        # Compute the sheet
-        &calcsheet($studentsheet);
-        &Apache::lonnet::logthis("Sheet value for A0 = ".$sheet->{'values'}->{'A0'});
+        &update_student_sheet($studentsheet,$r,$c);
         # Stuff the sheet into excel
         &export_sheet_as_excel($studentsheet,$student_excel_worksheet);
+        my $totaltime = int((time - $starttime) / $count * $sheet->{'maxrow'});
+        my $timeleft = int((time - $starttime) / $count * ($sheet->{'maxrow'} - $count));
         if ($count % 5 == 0) {
-            $r->print($count.' students completed<br />');
+            $r->print($count.' students completed.'.
+                      '  Time remaining: '.$timeleft.' sec. '.
+                      '  Estimated total time: '.$totaltime." sec <br />\n");
             $r->rflush();
         }
+        if(defined($c) && ($c->aborted())) {
+            last;
+        }
     }
     #
-    $r->print('All students spreadsheets completed<br />');
-    $r->rflush();
-    #
-    # &export_sheet_as_excel fills $worksheet with the data from $sheet
-    &export_sheet_as_excel($sheet,$main_worksheet);
-    #
-    $workbook->close();
-    # Okay, the spreadsheet is taken care of, so give the user a link.
-    $r->print('<br /><br />'.
-              '<a href="'.$filename.'">Your Excel spreadsheet.</a>'."\n");
+    if(! $c->aborted() ) {
+        $r->print('All students spreadsheets completed!<br />');
+        $r->rflush();
+        #
+        # &export_sheet_as_excel fills $worksheet with the data from $sheet
+        &export_sheet_as_excel($sheet,$main_worksheet);
+        #
+        $workbook->close();
+        # Okay, the spreadsheet is taken care of, so give the user a link.
+        $r->print('<br /><br />'.
+                  '<a href="'.$filename.'">Your Excel spreadsheet.</a>'."\n");
+    } else {
+        $workbook->close();  # Not sure how necessary this is.
+        #unlink('/home/httpd'.$filename); # No need to keep this around?
+    }
     return 1;
 }
 
@@ -1482,7 +1600,6 @@ sub create_excel_spreadsheet {
     my $filename = '/prtspool/'.
         $ENV{'user.name'}.'_'.$ENV{'user.domain'}.'_'.
         time.'_'.rand(1000000000).'.xls';
-    #&Apache::lonnet::logthis("spreadsheet:filename = ".$filename);
     my $workbook  = Spreadsheet::WriteExcel->new('/home/httpd'.$filename);
     if (! defined($workbook)) {
         $r->log_error("Error creating excel spreadsheet $filename: $!");
@@ -1505,24 +1622,57 @@ sub create_excel_spreadsheet {
 sub export_sheet_as_excel {
     my $sheet = shift;
     my $worksheet = shift;
+    #
+    my $rows_output = 0;
+    my $cols_output = 0;
+    ####################################
+    #    Write an identifying row      #
+    ####################################
+    my @Headerinfo = ($sheet->{'coursedesc'});
+    my $title = &gettitle($sheet);
+    $cols_output = 0;    
+    if (defined($title)) {
+        $worksheet->write($rows_output++,$cols_output++,$title);
+    }
+    ####################################
+    #   Write the summary/export row   #
+    ####################################
+    my ($rowlabel,@rowdata) = &get_row($sheet,'0');
+    my $label = &format_excel_rowlabel($rowlabel);
+    $cols_output = 0;
+    $worksheet->write($rows_output,$cols_output++,$label);
+    foreach my $cell (@rowdata) {
+        $worksheet->write($rows_output,$cols_output++,$cell->{'value'});
+    }
+    $rows_output+= 2;   # Skip a row, just for fun
     ####################################
     # Prepare to output rows
     ####################################
     my @Rows = &sort_indicies($sheet);
     #
     # Loop through the rows and output them one at a time
-    my $rows_output=0;
     foreach my $rownum (@Rows) {
         my ($rowlabel,@rowdata) = &get_row($sheet,$rownum);
-        my $cols_output = 0;
+        next if ($rowlabel =~ /^[\s]*$/);
+        $cols_output = 0;
         my $label = &format_excel_rowlabel($rowlabel);
+        if ( ! $ENV{'form.showall'} &&
+             $sheet->{'sheettype'} =~ /^(studentcalc|classcalc)$/) {
+            my $row_is_empty = 1;
+            foreach my $cell (@rowdata) {
+                if ($cell->{'value'} !~  /^\s*$/) {
+                    $row_is_empty = 0;
+                    last;
+                }
+            }
+            next if ($row_is_empty);
+        }
         $worksheet->write($rows_output,$cols_output++,$label);
         if (ref($label)) {
             $cols_output = (scalar(@$label));
         }
         foreach my $cell (@rowdata) {
-            $worksheet->write($rows_output,$cols_output++,
-                              $cell->{'value'});
+            $worksheet->write($rows_output,$cols_output++,$cell->{'value'});
         }
         $rows_output++;
     }
@@ -1543,7 +1693,7 @@ sub outsheet_xml   {
 ## Outsheet - calls other outsheet_* functions
 ##
 sub outsheet {
-    my ($r,$sheet)=@_;
+    my ($sheet,$r)=@_;
     if (! exists($ENV{'form.output'})) {
         $ENV{'form.output'} = 'HTML';
     }
@@ -1655,7 +1805,8 @@ sub readsheet {
             if ($fh=Apache::File->new($includedir.'/'.$dfn)) {
                 $sheetxml=join('',<$fh>);
             } else {
-                $sheetxml='<field row="0" col="A">"Error"</field>';
+                # $sheetxml='<field row="0" col="A">"Error"</field>';
+                $sheetxml='<field row="0" col="A"></field>';
             }
             %f=%{&parse_sheet(\$sheetxml)};
         } elsif($fn=~/\/*\.spreadsheet$/) {
@@ -1691,6 +1842,8 @@ sub makenewsheet {
     $sheet->{'udom'}  = $udom;
     $sheet->{'sheettype'} = $stype;
     $sheet->{'usymb'} = $usymb;
+    $sheet->{'mapid'} = $ENV{'form.mapid'};
+    $sheet->{'resid'} = $ENV{'form.resid'};
     $sheet->{'cid'}   = $ENV{'request.course.id'};
     $sheet->{'csec'}  = $Section{$uname.':'.$udom};
     $sheet->{'coursefilename'}   = $ENV{'request.course.fn'};
@@ -1698,7 +1851,7 @@ sub makenewsheet {
     $sheet->{'cdom'}  = $ENV{'course.'.$ENV{'request.course.id'}.'.domain'};
     $sheet->{'chome'} = $ENV{'course.'.$ENV{'request.course.id'}.'.home'};
     $sheet->{'coursedesc'} = $ENV{'course.'.$ENV{'request.course.id'}.
-                                      'description'};
+                                      '.description'};
     $sheet->{'uhome'} = &Apache::lonnet::homeserver($uname,$udom);
     #
     #
@@ -1904,10 +2057,11 @@ sub format_html_rowlabel {
     my ($type,$labeldata) = split(':',$rowlabel,2);
     my $result = '';
     if ($type eq 'symb') {
-        my ($symb,$uname,$udom,$title) = split(':',$labeldata);
+        my ($symb,$uname,$udom,$mapid,$resid,$title) = split(':',$labeldata);
         $symb = &Apache::lonnet::unescape($symb);
         $result = '<a href="/adm/assesscalc?usymb='.$symb.
-            '&uname='.$uname.'&udom='.$udom.'">'.$title.'</a>';
+            '&uname='.$uname.'&udom='.$udom.
+                '&mapid='.$mapid.'&resid='.$resid.'">'.$title.'</a>';
     } elsif ($type eq 'student') {
         my ($sname,$sdom,$fullname,$section,$id) = split(':',$labeldata);
         $result ='<a href="/adm/studentcalc?uname='.$sname.
@@ -1927,7 +2081,7 @@ sub format_csv_rowlabel {
     my ($type,$labeldata) = split(':',$rowlabel,2);
     my $result = '';
     if ($type eq 'symb') {
-        my ($symb,$uname,$udom,$title) = split(':',$labeldata);
+        my ($symb,$uname,$udom,$mapid,$resid,$title) = split(':',$labeldata);
         $symb = &Apache::lonnet::unescape($symb);
         $result = $title;
     } elsif ($type eq 'student') {
@@ -1948,7 +2102,7 @@ sub format_excel_rowlabel {
     my ($type,$labeldata) = split(':',$rowlabel,2);
     my $result = '';
     if ($type eq 'symb') {
-        my ($symb,$uname,$udom,$title) = split(':',$labeldata);
+        my ($symb,$uname,$udom,$mapid,$resid,$title) = split(':',$labeldata);
         $symb = &Apache::lonnet::unescape($symb);
         $result = $title;
     } elsif ($type eq 'student') {
@@ -1975,7 +2129,6 @@ sub updateclasssheet {
     my $chome =$sheet->{'chome'};
     #
     %Section = ();
-
     #
     # Read class list and row labels
     my $classlist = &Apache::loncoursedata::get_classlist();
@@ -1987,6 +2140,7 @@ sub updateclasssheet {
     foreach my $student (keys(%$classlist)) {
         my ($studentDomain,$studentName,$end,$start,$id,$studentSection,
             $fullname,$status)   =   @{$classlist->{$student}};
+        $Section{$studentName.':'.$studentDomain} = $studentSection;
         if ($ENV{'form.Status'} eq $status || $ENV{'form.Status'} eq 'Any') {
             $currentlist{$student}=join(':',('student',$studentName,
                                              $studentDomain,$fullname,
@@ -2034,29 +2188,81 @@ sub updateclasssheet {
 }
 
 # ----------------------------------- Update rows for student and assess sheets
-sub updatestudentassesssheet {
+sub get_student_rowlabels {
     my ($sheet) = @_;
     #
-    my %bighash;
+    my %course_db;
     #
     my $stype = $sheet->{'sheettype'};
     my $uname = $sheet->{'uname'};
     my $udom  = $sheet->{'udom'};
+    #
     $sheet->{'rowlabel'} = {};
-    my $identifier =$sheet->{'coursefilename'}.'_'.$stype.'_'.$uname.'_'.$udom;
-    if  ($updatedata{$identifier}) {
-        %{$sheet->{'rowlabel'}}=split(/___;___/,$updatedata{$identifier});
+    #
+    my $identifier =$sheet->{'coursefilename'}.'_'.$stype;
+    if  ($rowlabel_cache{$identifier}) {
+        %{$sheet->{'rowlabel'}}=split(/___;___/,$rowlabel_cache{$identifier});
     } else {
+        # Get the data and store it in the cache
         # Tie hash
-        tie(%bighash,'GDBM_File',$sheet->{'coursefilename'}.'.db',
+        tie(%course_db,'GDBM_File',$sheet->{'coursefilename'}.'.db',
             &GDBM_READER(),0640);
-        if (! tied(%bighash)) {
+        if (! tied(%course_db)) {
+            return 'Could not access course data';
+        }
+        #
+        my %assesslist;
+        foreach ('Feedback','Evaluation','Tutoring','Discussion') {
+            my $symb = '_'.lc($_);
+            $assesslist{$symb} = join(':',('symb',$symb,$uname,$udom,0,0,$_));
+        }
+        #
+        while (my ($key,$srcf) = each(%course_db)) {
+            next if ($key !~ /^src_(\d+)\.(\d+)$/);
+            my $mapid = $1;
+            my $resid = $2;
+            my $id   = $mapid.'.'.$resid;
+            if ($srcf=~/\.(problem|exam|quiz|assess|survey|form)$/) {
+                my $symb=
+                    &Apache::lonnet::declutter($course_db{'map_id_'.$mapid}).
+                        '___'.$resid.'___'.&Apache::lonnet::declutter($srcf);
+                $assesslist{$symb}='symb:'.&Apache::lonnet::escape($symb).':'
+                    .$uname.':'.$udom.':'.$mapid.':'.$resid.':'.
+                        $course_db{'title_'.$id};
+            }
+        }
+        untie(%course_db);
+        # Store away the data
+        $sheet->{'rowlabel'} = \%assesslist;
+        $rowlabel_cache{$identifier}=join('___;___',%{$sheet->{'rowlabel'}});
+    }
+
+}
+
+sub get_assess_rowlabels {
+    my ($sheet) = @_;
+    #
+    my %course_db;
+    #
+    my $stype = $sheet->{'sheettype'};
+    my $uname = $sheet->{'uname'};
+    my $udom  = $sheet->{'udom'};
+    my $usymb = $sheet->{'usymb'};
+    #
+    $sheet->{'rowlabel'} = {};
+    my $identifier =$sheet->{'coursefilename'}.'_'.$stype.'_'.$usymb;
+    #
+    if  ($rowlabel_cache{$identifier}) {
+        %{$sheet->{'rowlabel'}}=split(/___;___/,$rowlabel_cache{$identifier});
+    } else {
+        # Get the data and store it in the cache
+        # Tie hash
+        tie(%course_db,'GDBM_File',$sheet->{'coursefilename'}.'.db',
+            &GDBM_READER(),0640);
+        if (! tied(%course_db)) {
             return 'Could not access course data';
         }
-        # Get all assessments
         #
-        # parameter_labels is used in the assessment sheets to provide labels
-        # for the parameters.
         my %parameter_labels=
             ('timestamp' => 
                  'parameter:Timestamp of Last Transaction<br>timestamp',
@@ -2066,29 +2272,16 @@ sub updatestudentassesssheet {
                  'parameter:Number of Tutor Responses<br>tutornumber',
              'totalpoints' =>
                  'parameter:Total Points Granted<br>totalpoints');
-        #
-        # assesslist holds the descriptions of all assessments
-        my %assesslist;
-        foreach ('Feedback','Evaluation','Tutoring','Discussion') {
-            my $symb = '_'.lc($_);
-            $assesslist{$symb} = join(':',('symb',$symb,$uname,$udom,$_));
-        }
-        while (($_,undef) = each(%bighash)) {
-            next if ($_!~/^src\_(\d+)\.(\d+)$/);
-            my $mapid=$1;
-            my $resid=$2;
-            my $id=$mapid.'.'.$resid;
-            my $srcf=$bighash{$_};
+        while (my ($key,$srcf) = each(%course_db)) {
+            next if ($key !~ /^src_(\d+)\.(\d+)$/);
+            my $mapid = $1;
+            my $resid = $2;
+            my $id   = $mapid.'.'.$resid;
             if ($srcf=~/\.(problem|exam|quiz|assess|survey|form)$/) {
-                my $symb=
-                    &Apache::lonnet::declutter($bighash{'map_id_'.$mapid}).
-                        '___'.$resid.'___'.&Apache::lonnet::declutter($srcf);
-                $assesslist{$symb}='symb:'.&Apache::lonnet::escape($symb).':'
-                    .$uname.':'.$udom.':'.$bighash{'title_'.$id};
-                next if ($stype ne 'assesscalc');
-                foreach my $key (split(/\,/,
-                                       &Apache::lonnet::metadata($srcf,'keys')
-                                       )) {
+                # Loop through the metadata for this key
+                my @Metadata = split(/,/,
+                                     &Apache::lonnet::metadata($srcf,'keys'));
+                foreach my $key (@Metadata) {
                     next if ($key !~ /^(stores|parameter)_/);
                     my $display=
                         &Apache::lonnet::metadata($srcf,$key.'.display');
@@ -2100,46 +2293,44 @@ sub updatestudentassesssheet {
                     $parameter_labels{$key}='parameter:'.$display;
                 } # end of foreach
             }
-        } # end of foreach (keys(%bighash))
-        untie(%bighash);
-        #
-        # %parameter_labels has a list of storage and parameter displays by 
-        # unikey
-        # %assesslist has a list of all resource, by symb
-        #
-        if ($stype eq 'assesscalc') {
-            $sheet->{'rowlabel'} = \%parameter_labels;
-        } elsif ($stype eq 'studentcalc') {
-            $sheet->{'rowlabel'} = \%assesslist;
-        }
-        $updatedata{$sheet->{'coursefilename'}.'_'.$stype.'_'
-                        .$uname.'_'.$udom}=
-                            join('___;___',%{$sheet->{'rowlabel'}});
-        # Get current from cache
+        }
+        untie(%course_db);
+        # Store away the results
+        $sheet->{'rowlabel'} = \%parameter_labels;
+        $rowlabel_cache{$identifier}=join('___;___',%{$sheet->{'rowlabel'}});
     }
-    # Find discrepancies between the course row table and this
-    #
+        
+}
+
+sub updatestudentassesssheet {
+    my $sheet = shift;
+    if ($sheet->{'sheettype'} eq 'studentcalc') {
+        &get_student_rowlabels($sheet);
+    } else {
+        &get_assess_rowlabels($sheet);
+    }
+    # Determine if any of the information has changed
     my %f=&getformulas($sheet);
     my $changed=0;
     
     $sheet->{'maxrow'} = 0;
     my %existing=();
     # Now obsolete rows
-    foreach (keys(%f)) {
-        next if ($_!~/^A(\d+)/);
-        if ($1 > $sheet->{'maxrow'}) {
-            $sheet->{'maxrow'} = $1;
-        }
-        my ($usy,$ufn)=split(/__&&&\__/,$f{$_});
+    foreach my $cell (keys(%f)) {
+        my $formula = $f{$cell};
+        next if ($cell !~ /^A(\d+)/);
+        $sheet->{'maxrow'} = $1 if ($1 > $sheet->{'maxrow'});
+        my ($usy,$ufn)=split(/__&&&\__/,$formula);
         $existing{$usy}=1;
         unless ((exists($sheet->{'rowlabel'}->{$usy}) && 
                  (defined($sheet->{'rowlabel'}->{$usy})) || (!$1) ||
-                ($f{$_}=~/^(~~~|---)/))){
+                 ($formula =~ /^(~~~|---)/) )) {
             $f{$_}='!!! Obsolete';
             $changed=1;
         } elsif ($ufn) {
+            # I do not think this works any more
             $sheet->{'rowlabel'}->{$usy}
-                =~s/assesscalc\?usymb\=/assesscalc\?ufn\=$ufn\&usymb\=/;
+                =~s/assesscalc\?usymb\=/assesscalc\?ufn\=$ufn&\usymb\=/;
         }
     }
     # New and unknown keys
@@ -2154,16 +2345,14 @@ sub updatestudentassesssheet {
         $sheet->{'f'} = \%f;
         &setformulas($sheet); 
     }
-    #
-    undef %existing;
 }
 
 # ------------------------------------------------ Load data for one assessment
 
 sub loadstudent{
-    my ($sheet)=@_;
-    my %c=();
-    my %f=&getformulas($sheet);
+    my ($sheet,$r,$c)=@_;
+    my %constants=();
+    my %formulas=&getformulas($sheet);
     $cachedassess=$sheet->{'uname'}.':'.$sheet->{'udom'};
     # Get ALL the student preformance data
     my @tmp = &Apache::lonnet::dump($sheet->{'cid'},
@@ -2176,50 +2365,51 @@ sub loadstudent{
     undef @tmp;
     # 
     my @assessdata=();
-    foreach (keys(%f)) {
-	next if ($_!~/^A(\d+)/);
+    foreach my $cell (keys(%formulas)) {
+        my $value = $formulas{$cell};
+        if(defined($c) && ($c->aborted())) {
+            last;
+        }
+	next if ($cell !~ /^A(\d+)/);
         my $row=$1;
-        next if (($f{$_}=~/^[\!\~\-]/) || ($row==0));
-        my ($usy,$ufn)=split(/__&&&\__/,$f{$_});
+        next if (($value =~ /^[!~-]/) || ($row==0));
+        my ($usy,$ufn)=split(/__&&&\__/,$value);
         @assessdata=&exportsheet($sheet,$sheet->{'uname'},
                                  $sheet->{'udom'},
-                                 'assesscalc',$usy,$ufn);
+                                 'assesscalc',$usy,$ufn,$r);
         my $index=0;
-        foreach ('A','B','C','D','E','F','G','H','I','J','K','L','M',
-                 'N','O','P','Q','R','S','T','U','V','W','X','Y','Z') {
-            if ($assessdata[$index]) {
-                my $col=$_;
+        foreach my $col ('A','B','C','D','E','F','G','H','I','J','K','L','M',
+                         'N','O','P','Q','R','S','T','U','V','W','X','Y','Z') {
+            if (defined($assessdata[$index])) {
                 if ($assessdata[$index]=~/\D/) {
-                    $c{$col.$row}="'".$assessdata[$index]."'";
+                    $constants{$col.$row}="'".$assessdata[$index]."'";
                 } else {
-                    $c{$col.$row}=$assessdata[$index];
-                }
-                unless ($col eq 'A') { 
-                    $f{$col.$row}='import';
+                    $constants{$col.$row}=$assessdata[$index];
                 }
+                $formulas{$col.$row}='import' if ($col ne 'A');
             }
             $index++;
         }
     }
     $cachedassess='';
     undef %cachedstores;
-    $sheet->{'f'} = \%f;
+    $sheet->{'f'} = \%formulas;
     &setformulas($sheet);
-    &setconstants($sheet,\%c);
+    &setconstants($sheet,\%constants);
 }
 
 # --------------------------------------------------- Load data for one student
 #
 sub loadcourse {
-    my ($sheet,$r)=@_;
+    my ($sheet,$r,$c)=@_;
     #
-    my %c=();
-    my %f=&getformulas($sheet);
+    my %constants=();
+    my %formulas=&getformulas($sheet);
     #
     my $total=0;
-    foreach (keys(%f)) {
+    foreach (keys(%formulas)) {
 	if ($_=~/^A(\d+)/) {
-	    unless ($f{$_}=~/^[\!\~\-]/) { $total++; }
+	    unless ($formulas{$_}=~/^[\!\~\-]/) { $total++; }
         }
     }
     my $now=0;
@@ -2236,12 +2426,16 @@ sub loadcourse {
 </script>
 ENDPOP
     $r->rflush();
-    foreach (keys(%f)) {
+    foreach (keys(%formulas)) {
+        if(defined($c) && ($c->aborted())) {
+            last;
+        }
 	next if ($_!~/^A(\d+)/);
         my $row=$1;
-        next if (($f{$_}=~/^[\!\~\-]/)  || ($row==0));
-        my ($sname,$sdom) = split(':',$f{$_});
-        my @studentdata=&exportsheet($sheet,$sname,$sdom,'studentcalc');
+        next if (($formulas{$_}=~/^[\!\~\-]/)  || ($row==0));
+        my ($sname,$sdom) = split(':',$formulas{$_});
+        my @studentdata=&exportsheet($sheet,$sname,$sdom,'studentcalc',
+                                     undef,undef,$r);
         undef %userrdatas;
         $now++;
         $r->print('<script>popwin.document.popremain.remaining.value="'.
@@ -2255,20 +2449,20 @@ ENDPOP
             if (defined($studentdata[$index])) {
                 my $col=$_;
                 if ($studentdata[$index]=~/\D/) {
-                    $c{$col.$row}="'".$studentdata[$index]."'";
+                    $constants{$col.$row}="'".$studentdata[$index]."'";
                 } else {
-                    $c{$col.$row}=$studentdata[$index];
+                    $constants{$col.$row}=$studentdata[$index];
                 }
                 unless ($col eq 'A') { 
-                    $f{$col.$row}='import';
+                    $formulas{$col.$row}='import';
                 }
             } 
             $index++;
         }
     }
-    $sheet->{'f'}=\%f;
+    $sheet->{'f'}=\%formulas;
     &setformulas($sheet);
-    &setconstants($sheet,\%c);
+    &setconstants($sheet,\%constants);
     $r->print('<script>popwin.close()</script>');
     $r->rflush(); 
 }
@@ -2276,7 +2470,7 @@ ENDPOP
 # ------------------------------------------------ Load data for one assessment
 #
 sub loadassessment {
-    my ($sheet)=@_;
+    my ($sheet,$r,$c)=@_;
 
     my $uhome = $sheet->{'uhome'};
     my $uname = $sheet->{'uname'};
@@ -2426,8 +2620,7 @@ sub selectbox {
 
 sub updatesheet {
     my ($sheet)=@_;
-    my $stype=$sheet->{'sheettype'};
-    if ($stype eq 'classcalc') {
+    if ($sheet->{'sheettype'} eq 'classcalc') {
 	return &updateclasssheet($sheet);
     } else {
         return &updatestudentassesssheet($sheet);
@@ -2441,13 +2634,14 @@ sub updatesheet {
 
 sub loadrows {
     my ($sheet,$r)=@_;
+    my $c = $r->connection;
     my $stype=$sheet->{'sheettype'};
     if ($stype eq 'classcalc') {
-	&loadcourse($sheet,$r);
+	&loadcourse($sheet,$r,$c);
     } elsif ($stype eq 'studentcalc') {
-        &loadstudent($sheet);
+        &loadstudent($sheet,$r,$c);
     } else {
-        &loadassessment($sheet);
+        &loadassessment($sheet,$r,$c);
     }
 }
 
@@ -2455,7 +2649,11 @@ sub loadrows {
 
 sub checkthis {
     my ($keyname,$time)=@_;
-    return ($time<$expiredates{$keyname});
+    if (! exists($expiredates{$keyname})) {
+        return 0;
+    } else {
+        return ($time<$expiredates{$keyname});
+    }
 }
 
 sub forcedrecalc {
@@ -2488,7 +2686,8 @@ sub forcedrecalc {
 # returns the export row for a spreadsheet.
 #
 sub exportsheet {
-    my ($sheet,$uname,$udom,$stype,$usymb,$fn)=@_;
+    my ($sheet,$uname,$udom,$stype,$usymb,$fn,$r)=@_;
+    my $flag = 0;
     $uname = $uname || $sheet->{'uname'};
     $udom  = $udom  || $sheet->{'udom'};
     $stype = $stype || $sheet->{'sheettype'};
@@ -2542,7 +2741,7 @@ sub exportsheet {
     my ($newsheet)=&makenewsheet($uname,$udom,$stype,$usymb);
     &readsheet($newsheet,$fn);
     &updatesheet($newsheet);
-    &loadrows($newsheet);
+    &loadrows($newsheet,$r);
     &calcsheet($newsheet); 
     @exportarr=&exportdata($newsheet);
     ##
@@ -2557,14 +2756,24 @@ sub exportsheet {
                                        [$key],
                                        $sheet->{'cdom'},$sheet->{'cnum'});
         if ($tmp[0]!~/^error/) {
-            %currentlystored = @tmp;
+            # We only got one key, so we will access it directly.
+            foreach (split('___&___',$tmp[1])) {
+                my ($key,$value) = split('___=___',$_);
+                $key = '' if (! defined($key));
+                $currentlystored{$key} = $value;
+            }
         }
     } else {
         my @tmp = &Apache::lonnet::get('nohist_calculatedsheets_'.
                                        $sheet->{'cid'},[$key],
                                        $sheet->{'udom'},$sheet->{'uname'});
         if ($tmp[0]!~/^error/) {
-            %currentlystored = @tmp;
+            # We only got one key, so we will access it directly.
+            foreach (split('___&___',$tmp[1])) {
+                my ($key,$value) = split('___=___',$_);
+                $key = '' if (! defined($key));
+                $currentlystored{$key} = $value;
+            }
         }
     }
     #
@@ -2583,17 +2792,19 @@ sub exportsheet {
     #
     # Store away the new value
     #
+    my $timekey = $key.'.time';
     if ($stype eq 'studentcalc') {
-        &Apache::lonnet::put('nohist_calculatedsheets',
-                             { $key => $newstore,
-                               $key.time => $now },
-                             $sheet->{'cdom'},$sheet->{'cnum'});
-    } else {
-        &Apache::lonnet::put('nohist_calculatedsheets_'.$sheet->{'cid'},
-                             { $key => $newstore,
-                               $key.time => $now },
-                             $sheet->{'udom'},
-                             $sheet->{'uname'})
+        my $result = &Apache::lonnet::put('nohist_calculatedsheets',
+                                          { $key     => $newstore,
+                                            $timekey => $now },
+                                          $sheet->{'cdom'},
+                                          $sheet->{'cnum'});
+    } else {
+        my $result = &Apache::lonnet::put('nohist_calculatedsheets_'.$sheet->{'cid'},
+                                          { $key     => $newstore,
+                                            $timekey => $now },
+                                          $sheet->{'udom'},
+                                          $sheet->{'uname'});
     }
     return @exportarr;
 }
@@ -2602,13 +2813,13 @@ sub exportsheet {
 #
 # Load previously cached student spreadsheets for this course
 #
-sub expirationdates {
+sub load_spreadsheet_expirationdates {
     undef %expiredates;
     my $cid=$ENV{'request.course.id'};
     my @tmp = &Apache::lonnet::dump('nohist_expirationdates',
                                     $ENV{'course.'.$cid.'.domain'},
                                     $ENV{'course.'.$cid.'.num'});
-    if (lc($tmp[0])!~/^error/){
+    if (lc($tmp[0]) !~ /^error/){
         %expiredates = @tmp;
     }
 }
@@ -2640,18 +2851,21 @@ sub cachedssheets {
     my ($sheet,$uname,$udom) = @_;
     $uname = $uname || $sheet->{'uname'};
     $udom  = $udom  || $sheet->{'udom'};
-    if (! $loadedcaches{$sheet->{'uname'}.'_'.$sheet->{'udom'}}) {
+    if (! $loadedcaches{$uname.'_'.$udom}) {
         my @tmp = &Apache::lonnet::dump('nohist_calculatedsheets',
                                         $sheet->{'udom'},
                                         $sheet->{'uname'});
         if ($tmp[0] !~ /^error/) {
-            my %StupidTempHash = @tmp;
-            while (my ($key,$value) = each %StupidTempHash) {
+            my %TempHash = @tmp;
+            my $count = 0;
+            while (my ($key,$value) = each %TempHash) {
                 $oldsheets{$key} = $value;
+                $count++;
             }
             $loadedcaches{$sheet->{'uname'}.'_'.$sheet->{'udom'}}=1;
         }
     }
+    
 }
 
 # ===================================================== Calculated sheets cache
@@ -2677,6 +2891,9 @@ sub handler {
               lc($ENV{'form.output'}) eq 'recursive excel')) {
         $ENV{'form.output'} = 'HTML';
     }
+    #
+    # Overload checking
+    #
     # Check this server
     my $loaderror=&Apache::lonnet::overloaderror($r);
     if ($loaderror) { return $loaderror; }
@@ -2684,15 +2901,22 @@ sub handler {
     $loaderror= &Apache::lonnet::overloaderror($r,
                       $ENV{'course.'.$ENV{'request.course.id'}.'.home'});
     if ($loaderror) { return $loaderror; } 
-    
+    #
+    # HTML Header
+    #
     if ($r->header_only) {
         $r->content_type('text/html');
         $r->send_http_header;
         return OK;
     }
+    #
     # Global directory configs
+    #
     $includedir = $r->dir_config('lonIncludes');
     $tmpdir = $r->dir_config('lonDaemons').'/tmp/';
+    #
+    # Roles Checking
+    #
     # Needs to be in a course
     if (! $ENV{'request.course.fn'}) { 
         # Not in a course, or not allowed to modify parms
@@ -2700,17 +2924,27 @@ sub handler {
             $r->uri.":opa:0:0:Cannot modify spreadsheet";
         return HTTP_NOT_ACCEPTABLE; 
     }
+    #
     # Get query string for limited number of parameters
-    &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
-                                            ['uname','udom','usymb','ufn']);
+    #
+    &Apache::loncommon::get_unprocessed_cgi
+        ($ENV{'QUERY_STRING'},['uname','udom','usymb','ufn','mapid','resid']);
+    #
+    # Deal with restricted student permissions 
+    #
     if ($ENV{'request.role'} =~ /^st\./) {
         delete $ENV{'form.unewfield'}   if (exists($ENV{'form.unewfield'}));
         delete $ENV{'form.unewformula'} if (exists($ENV{'form.unewformula'}));
     }
+    #
+    # Clean up symb and spreadsheet filename
+    #
     if (($ENV{'form.usymb'}=~/^\_(\w+)/) && (!$ENV{'form.ufn'})) {
         $ENV{'form.ufn'}='default_'.$1;
     }
+    #
     # Interactive loading of specific sheet?
+    #
     if (($ENV{'form.load'}) && ($ENV{'form.loadthissheet'} ne 'Default')) {
         $ENV{'form.ufn'}=$ENV{'form.loadthissheet'};
     }
@@ -2726,24 +2960,55 @@ sub handler {
         $adom=$ENV{'form.udom'};
     }
     #
-    # Open page
+    # Open page, try to prevent browser cache.
+    #
     $r->content_type('text/html');
     $r->header_out('Cache-control','no-cache');
     $r->header_out('Pragma','no-cache');
     $r->send_http_header;
-    # Screen output
+    #
+    # Header....
+    #
     $r->print('<html><head><title>LON-CAPA Spreadsheet</title>');
+    my $nothing = "''";
+    if ($ENV{'browser.type'} eq 'explorer') {
+        $nothing = "'javascript:void(0);'";
+    }
+
     if ($ENV{'request.role'} !~ /^st\./) {
         $r->print(<<ENDSCRIPT);
 <script language="JavaScript">
 
-    function celledit(cn,cf) {
-        var cnf=prompt(cn,cf);
-        if (cnf!=null) {
-            document.sheet.unewfield.value=cn;
-            document.sheet.unewformula.value=cnf;
-            document.sheet.submit();
+    var editwin;
+
+    function celledit(cellname,cellformula) {
+        var edit_text = '';
+        edit_text +='<html><head><title>Cell Edit Window</title></head><body>';
+        edit_text += '<form name="editwinform">';
+        edit_text += '<center><h3>Cell '+cellname+'</h3>';
+        edit_text += '<textarea name="newformula" cols="40" rows="6"';
+        edit_text += ' wrap="off" >'+cellformula+'</textarea>';
+        edit_text += '</br>';
+        edit_text += '<input type="button" name="accept" value="Accept"';
+        edit_text += ' onClick=\\\'javascript:';
+        edit_text += 'opener.document.sheet.unewfield.value=';
+        edit_text +=     '"'+cellname+'";';
+        edit_text += 'opener.document.sheet.unewformula.value=';
+        edit_text +=     'document.editwinform.newformula.value;';
+        edit_text += 'opener.document.sheet.submit();';
+        edit_text += 'self.close()\\\' />';
+        edit_text += '&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;';
+        edit_text += '<input type="button" name="abort" ';
+        edit_text +=     'value="Discard Changes"';
+        edit_text += ' onClick="javascript:self.close()" />';
+        edit_text += '</center></body></html>';
+
+        if (editwin != null && !(editwin.closed) ) {
+            editwin.close();
         }
+
+        editwin = window.open($nothing,'CellEditWin','height=200,width=350,scrollbars=no,resizeable=yes,alwaysRaised=yes,dependent=yes',true);
+        editwin.document.write(edit_text);
     }
 
     function changesheet(cn) {
@@ -2762,7 +3027,7 @@ sub handler {
 ENDSCRIPT
     }
     $r->print('</head>'.&Apache::loncommon::bodytag('Grades Spreadsheet').
-              '<form action="'.$r->uri.'" name=sheet method=post>');
+              '<form action="'.$r->uri.'" name="sheet" method="post">');
     $r->print(&hiddenfield('uname',$ENV{'form.uname'}).
               &hiddenfield('udom',$ENV{'form.udom'}).
               &hiddenfield('usymb',$ENV{'form.usymb'}).
@@ -2771,17 +3036,42 @@ ENDSCRIPT
     $r->rflush();
     #
     # Full recalc?
+    #
     if ($ENV{'form.forcerecalc'}) {
         $r->print('<h4>Completely Recalculating Sheet ...</h4>');
         undef %spreadsheets;
         undef %courserdatas;
         undef %userrdatas;
         undef %defaultsheets;
-        undef %updatedata;
+        undef %rowlabel_cache;
     }
     # Read new sheet or modified worksheet
     my ($sheet)=&makenewsheet($aname,$adom,$sheettype,$ENV{'form.usymb'});
     #
+    # Check user permissions
+    if (($sheet->{'sheettype'} eq 'classcalc'       ) || 
+        ($sheet->{'uname'}     ne $ENV{'user.name'} ) ||
+        ($sheet->{'udom'}      ne $ENV{'user.domain'})) {
+        unless (&Apache::lonnet::allowed('vgr',$sheet->{'cid'})) {
+            $r->print('<h1>Access Permission Denied</h1>'.
+                      '</form></body></html>');
+            return OK;
+        }
+    }
+    # Print out user information
+    $r->print('<h2>'.$sheet->{'coursedesc'}.'</h2>');
+    if ($sheet->{'sheettype'} ne 'classcalc') {
+        $r->print('<h2>'.&gettitle($sheet).'</h2><p>');
+    }
+    if ($sheet->{'sheettype'} eq 'assesscalc') {
+        $r->print('<b>User:</b> '.$sheet->{'uname'}.
+                  '<br /><b>Domain:</b> '.$sheet->{'udom'}.'<br />');
+    }
+    if ($sheet->{'sheettype'} eq 'studentcalc' || 
+        $sheet->{'sheettype'} eq 'assesscalc') {
+        $r->print('<b>Section/Group:</b>'.$sheet->{'csec'}.'</p>');
+    } 
+    #
     # If a new formula had been entered, go from work copy
     if ($ENV{'form.unewfield'}) {
         $r->print('<h2>Modified Workcopy</h2>');
@@ -2796,43 +3086,23 @@ ENDSCRIPT
     } else {
         &readsheet($sheet,$ENV{'form.ufn'});
     }
-    # Print out user information
-    if ($sheet->{'sheettype'} ne 'classcalc') {
-        $r->print('<p><b>User:</b> '.$sheet->{'uname'}.
-                  '<br><b>Domain:</b> '.$sheet->{'udom'});
-        $r->print('<br><b>Section/Group:</b> '.$sheet->{'csec'});
-        if ($ENV{'form.usymb'}) {
-            $r->print('<br><b>Assessment:</b> <tt>'.
-                      $ENV{'form.usymb'}.'</tt>');
-        }
-    }
-    #
-    # Check user permissions
-    if (($sheet->{'sheettype'} eq 'classcalc'       ) || 
-        ($sheet->{'uname'}     ne $ENV{'user.name'} ) ||
-        ($sheet->{'udom'}      ne $ENV{'user.domain'})) {
-        unless (&Apache::lonnet::allowed('vgr',$sheet->{'cid'})) {
-            $r->print('<h1>Access Permission Denied</h1>'.
-                      '</form></body></html>');
-            return OK;
-        }
-    }
     # Additional options
-    $r->print('<br />'.
-              '<input type="submit" name="forcerecalc" '.
-              'value="Completely Recalculate Sheet"><p>');
     if ($sheet->{'sheettype'} eq 'assesscalc') {
         $r->print('<p><font size=+2>'.
                   '<a href="/adm/studentcalc?'.
                   'uname='.$sheet->{'uname'}.
                   '&udom='.$sheet->{'udom'}.'">'.
-                  'Level up: Student Sheet</a></font><p>');
+                  'Level up: Student Sheet</a></font></p>');
     }
     if (($sheet->{'sheettype'} eq 'studentcalc') && 
         (&Apache::lonnet::allowed('vgr',$sheet->{'cid'}))) {
         $r->print ('<p><font size=+2><a href="/adm/classcalc">'.
-                   'Level up: Course Sheet</a></font><p>');
+                   'Level up: Course Sheet</a></font></p>');
     }
+    # Recalc button
+    $r->print('<br />'.
+              '<input type="submit" name="forcerecalc" '.
+              'value="Completely Recalculate Sheet"></p>');
     # Save dialog
     if (&Apache::lonnet::allowed('opa',$ENV{'request.course.id'})) {
         my $fname=$ENV{'form.ufn'};
@@ -2861,10 +3131,18 @@ ENDSCRIPT
                             &othersheets($sheet,'assesscalc'));
         }
     }
-    # Cached sheets
-    &expirationdates();
-    undef %oldsheets;
-    undef %loadedcaches;
+    #
+    # Set up caching mechanisms
+    #
+    &load_spreadsheet_expirationdates();
+    # Clear out old caches if we have not seen this class before.
+    if (exists($oldsheets{'course'}) &&
+        $oldsheets{'course'} ne $sheet->{'cid'}) {
+        undef %oldsheets;
+        undef %loadedcaches;
+    }
+    $oldsheets{'course'} = $sheet->{'cid'};
+    #
     if ($sheet->{'sheettype'} eq 'classcalc') {
         $r->print("Loading previously calculated student sheets ...\n");
         $r->rflush();
@@ -2904,12 +3182,12 @@ ENDSCRIPT
     }
     #
     # Write the modified worksheet
-    $r->print('<b>Current sheet:</b> '.$sheet->{'filename'}.'<p>');
+    $r->print('<b>Current sheet:</b> '.$sheet->{'filename'}.'</p>');
     &tmpwrite($sheet);
-    if ($sheet->{'sheettype'} eq 'studentcalc') {
-        $r->print('<br>Show rows with empty A column: ');
+    if ($sheet->{'sheettype'} eq 'assesscalc') {
+        $r->print('<p>Show rows with empty A column: ');
     } else {
-        $r->print('<br>Show empty rows: ');
+        $r->print('<p>Show empty rows: ');
     }
     #
     $r->print(&hiddenfield('userselhidden','true').
@@ -2962,7 +3240,7 @@ ENDSCRIPT
 #value='Insert Row Bottom'><br>
 #ENDINSERTBUTTONS
     # Print out sheet
-    &outsheet($r,$sheet);
+    &outsheet($sheet,$r);
     $r->print('</form></body></html>');
     #  Done
     return OK;