--- loncom/interface/lontrackstudent.pm	2005/02/09 21:21:08	1.13
+++ loncom/interface/lontrackstudent.pm	2006/03/15 19:41:26	1.18
@@ -1,6 +1,6 @@
 # The LearningOnline Network with CAPA
 #
-# $Id: lontrackstudent.pm,v 1.13 2005/02/09 21:21:08 matthew Exp $
+# $Id: lontrackstudent.pm,v 1.18 2006/03/15 19:41:26 albertel Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -45,10 +45,12 @@ package Apache::lontrackstudent;
 use strict;
 use Apache::Constants qw(:common :http);
 use Apache::lonmysql;
-use Apache::lonnet();
+use Apache::lonnet;
 use Apache::lonlocal;
 use Time::HiRes;
 
+my $num_records=500;
+
 sub get_data {
     my ($r,$prog_state,$navmap,$mode) = @_;
     ##
@@ -61,9 +63,9 @@ sub get_data {
     #
     my $max_time = &get_max_time_in_db($r,$prog_state);
     if (defined($max_time)) {
-        $r->print('<h3>'.&mt('Activity data goes to [_1]',
+        $r->print('<h3>'.&mt('Activity data compiled up to [_1]',
                              &Apache::lonlocal::locallocaltime($max_time)).
-                  '</h3>');
+                  '</h3>'.&mt('While data is processed, periodically reload this page for more recent activity').'<br />');
         $r->rflush();
     } else {
         $r->print('<h3>'.&mt('Unable to retrieve any data.  Please reload this page and try again.').'</h3>');
@@ -72,7 +74,7 @@ sub get_data {
     my $query = &build_query($mode);
     ##
     ## Send it along
-    my $home = $ENV{'course.'.$ENV{'request.course.id'}.'.home'};
+    my $home = $env{'course.'.$env{'request.course.id'}.'.home'};
     my $reply=&Apache::lonnet::metadata_query($query,undef,undef,[$home]);
     if (ref($reply) ne 'HASH') {
         $r->print('<h2>'.
@@ -107,15 +109,21 @@ sub get_data {
         ($r,$prog_state,&mt('Parsing results'));
     #
     &output_results($r,$results_file,$navmap,$mode);
+    my ($sname,$sdom) = ($mode=~/^student:(.*):(.*)$/);
+    $r->print(&Apache::loncommon::track_student_link(
+				  'View more activity by this student',
+				  $sname,$sdom,undef,
+				  ($env{'form.start'}+$num_records)));
+
     &Apache::lonhtmlcommon::Update_PrgWin($r,$prog_state,&mt('Finished!'));
     return;
 }
 
 sub table_names {
-    my $cid = $ENV{'request.course.id'};
-    my $domain = $ENV{'course.'.$cid.'.domain'};
-    my $home = $ENV{'course.'.$cid.'.home'};
-    my $course = $ENV{'course.'.$cid.'.num'};
+    my $cid = $env{'request.course.id'};
+    my $domain = $env{'course.'.$cid.'.domain'};
+    my $home = $env{'course.'.$cid.'.home'};
+    my $course = $env{'course.'.$cid.'.num'};
     my $prefix = $course.'_'.$domain.'_';
     #
     my %tables = 
@@ -132,7 +140,7 @@ sub get_max_time_in_db {
     my %table = &table_names();
     my $query = qq{SELECT MAX(time) FROM $table{'activity'} };
     #
-    my $home = $ENV{'course.'.$ENV{'request.course.id'}.'.home'};
+    my $home = $env{'course.'.$env{'request.course.id'}.'.home'};
     my $reply=&Apache::lonnet::metadata_query($query,undef,undef,[$home]);
     if (ref($reply) ne 'HASH') {
         return undef;
@@ -183,11 +191,12 @@ sub get_max_time_in_db {
 
 sub build_query {
     my ($mode) = @_;
-    my $cid = $ENV{'request.course.id'};
-    my $domain = $ENV{'course.'.$cid.'.domain'};
-    my $home = $ENV{'course.'.$cid.'.home'};
-    my $course = $ENV{'course.'.$cid.'.num'};
+    my $cid = $env{'request.course.id'};
+    my $domain = $env{'course.'.$cid.'.domain'};
+    my $home = $env{'course.'.$cid.'.home'};
+    my $course = $env{'course.'.$cid.'.num'};
     my $prefix = $course.'_'.$domain.'_';
+    my $start = ($env{'form.start'}+0);
     #
     my %table = &table_names();
     #
@@ -200,7 +209,7 @@ sub build_query {
             LEFT JOIN $table{'student'}  AS C ON C.student_id=A.student_id 
             LEFT JOIN $table{'machine'}  AS E ON E.machine_id=A.machine_id
             ORDER BY A.time DESC
-            LIMIT 500
+            LIMIT $start, $num_records
         };
     } elsif ($mode =~ /^student:(.*):(.*)$/) {
         my $student = $1.':'.$2;
@@ -212,7 +221,7 @@ sub build_query {
                 LEFT JOIN $table{'machine'}  AS E ON E.machine_id=A.machine_id
                 WHERE C.student='$student'
                 ORDER BY A.time DESC
-                LIMIT 500
+                LIMIT $start, $num_records
             };
     }
     $query =~ s|$/||g;
@@ -227,7 +236,7 @@ sub output_results {
     ##
     if (! -s $results_file) {
         # results file is empty, just let them know there is no data
-        $r->print('<h2>'.&mt('No data was returned for your request').'</h2>');
+        $r->print('<h2>'.&mt('So far, no data has been returned for your request').'</h2>');
         return;
     }
     if (! open(ACTIVITYDATA,$results_file)) {
@@ -262,7 +271,7 @@ sub output_results {
             '<th align="left">'.&mt('Data').'</th>'.
             '</tr>'.$/;
     }
-    my $count = -1;
+    my $count = $env{'form.start'}-1;
     $r->rflush();
     ##
     ##
@@ -336,7 +345,7 @@ sub output_results {
 	$values = &display_values($action,$values);
         #
         # Build the row for output
-        my $tablerow = qq{<tr class="$class">};
+        my $tablerow = qq{<tr class="$class"><td>}.($count+1).qq{</td>};
         if ($src =~ m|^/adm/|) {
             $tablerow .= 
                 '<td valign="top"><nobr>'.$title.'</nobr></td>';
@@ -357,7 +366,7 @@ sub output_results {
             '</tr>';
         $r->print($tablerow.$/);
     }
-    $r->print('</table>'.$/) if (! $count % 50);
+    $r->print('</table>'.$/);### if (! $count % 50);
     close(ACTIVITYDATA);
     return;
 }
@@ -394,10 +403,10 @@ sub display_values {
 ###################################################################
 sub request_data_update {
     my $command = 'prepare activity log';
-    my $cid = $ENV{'request.course.id'};
-    my $domain = $ENV{'course.'.$cid.'.domain'};
-    my $home = $ENV{'course.'.$cid.'.home'};
-    my $course = $ENV{'course.'.$cid.'.num'};
+    my $cid = $env{'request.course.id'};
+    my $domain = $env{'course.'.$cid.'.domain'};
+    my $home = $env{'course.'.$cid.'.home'};
+    my $course = $env{'course.'.$cid.'.num'};
 #    &Apache::lonnet::logthis($command.' '.$course.' '.$domain.' '.$home);
     my $result = &Apache::lonnet::metadata_query($command,$course,$domain,
                                                  [$home]);
@@ -463,18 +472,18 @@ sub handler {
     $loaderror=
         &Apache::lonnet::overloaderror
         ($r,
-         $ENV{'course.'.$ENV{'request.course.id'}.'.home'});
+         $env{'course.'.$env{'request.course.id'}.'.home'});
     if ($loaderror) { return $loaderror; }
     #
     # Check for access
-    if (! &Apache::lonnet::allowed('vsa',$ENV{'request.course.id'})) {
-        $ENV{'user.error.msg'}=
+    if (! &Apache::lonnet::allowed('vsa',$env{'request.course.id'})) {
+        $env{'user.error.msg'}=
             $r->uri.":vsa:0:0:Cannot student activity for complete course";
         if (! 
             &Apache::lonnet::allowed('vsa',
-                                     $ENV{'request.course.id'}.'/'.
-                                     $ENV{'request.course.sec'})) {
-            $ENV{'user.error.msg'}=
+                                     $env{'request.course.id'}.'/'.
+                                     $env{'request.course.sec'})) {
+            $env{'user.error.msg'}=
                 $r->uri.":vsa:0:0:Cannot view student activity with given role";
             return HTTP_NOT_ACCEPTABLE;
         }
@@ -488,7 +497,7 @@ sub handler {
     #
     # Extract form elements from query string
     &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
-                                            ['selected_student']);
+                                            ['selected_student','start']);
     #
     # We will almost always need this...
     my $navmap = Apache::lonnavmaps::navmap->new();
@@ -501,10 +510,7 @@ sub handler {
                                             bug=>'instructor interface'});
     #
     # Give the LON-CAPA page header
-    $r->print('<html><head>'.&styles.'<title>'.
-              &mt('Student Activity').
-              "</title></head>\n".
-              &Apache::loncommon::bodytag('Student Activity').
+    $r->print(&Apache::loncommon::start_page('Student Activity',&styles()).
               &Apache::lonhtmlcommon::breadcrumbs(undef,'Student Activity'));
     $r->rflush();
     #
@@ -525,20 +531,20 @@ sub handler {
     #
     my $result = &request_data_update();
     #
-    if (exists($ENV{'form.selected_student'})) {
+    if (exists($env{'form.selected_student'})) {
         # For now, just show all the data, in the future allow selection of
         # a student
-        my ($sname,$sdom) = split(':',$ENV{'form.selected_student'});
+        my ($sname,$sdom) = split(':',$env{'form.selected_student'});
         if ($sname =~ /^\w*$/ && $sdom =~ /^\w*$/) {
             $r->print('<h2>'.
                       &mt('Recent activity of [_1]@[_2]',$sname,$sdom).
                       '</h2>');
             $r->print('<p>'.&mt(<<END).'</p>');
 Compiling student activity data can take a long time.
-It may be necessary to reload this page to get the most current information.
+Your request continues to be processed while results are displayed.
 END
             &get_data($r,\%prog_state,$navmap,
-                      'student:'.$ENV{'form.selected_student'});
+                      'student:'.$env{'form.selected_student'});
         } else {
             $r->print('<h2>'.&mt('Unable to process for [_1]@[_2]',
                                  $sname,$sdom).'</h2>');
@@ -552,7 +558,7 @@ END
     &Apache::lonhtmlcommon::Close_PrgWin($r,\%prog_state);
     #
     $r->print("</form>\n");
-    $r->print("</body>\n</html>\n");
+    $r->print(&Apache::loncommon::end_page());
     $r->rflush();
     #
     return OK;