--- loncom/interface/slotrequest.pm	2009/11/04 15:37:23	1.106
+++ loncom/interface/slotrequest.pm	2014/02/11 19:11:24	1.119
@@ -1,7 +1,7 @@
 # The LearningOnline Network with CAPA
 # Handler for requesting to have slots added to a students record
 #
-# $Id: slotrequest.pm,v 1.106 2009/11/04 15:37:23 raeburn Exp $
+# $Id: slotrequest.pm,v 1.119 2014/02/11 19:11:24 bisitz Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -137,16 +137,20 @@ sub check_for_reservation {
 	return 'error: Unable to determine current status';
     }    
     my @got;
-    my @sorted_slots = &Apache::loncommon::sorted_slots(\@slots,\%slots);
+    my @sorted_slots = &Apache::loncommon::sorted_slots(\@slots,\%slots,'starttime');
     foreach my $slot_name (@sorted_slots) {
 	next if (!defined($slots{$slot_name}) ||
 		 !ref($slots{$slot_name}));
 	&Apache::lonxml::debug(time." $slot_name ".
 			       $slots{$slot_name}->{'starttime'}." -- ".
-			       $slots{$slot_name}->{'startreserve'});
-	if ($slots{$slot_name}->{'endtime'} > time &&
-	    $slots{$slot_name}->{'startreserve'} < time) {
-	    # between start of reservation times and end of slot
+			       $slots{$slot_name}->{'startreserve'}." -- ".
+                               $slots{$slot_name}->{'endreserve'});
+	if (($slots{$slot_name}->{'endtime'} > time) &&
+	    ($slots{$slot_name}->{'startreserve'} < time) &&
+            ((!$slots{$slot_name}->{'endreserve'}) || 
+             ($slots{$slot_name}->{'endreserve'} > time))) {
+	    # between start of reservation time and end of reservation time
+            # and before end of slot
 	    if ($mode eq 'allslots') {
 		push(@got,$slot_name);
 	    } else {
@@ -335,12 +339,12 @@ sub store_slot_parm {
                        context => $env{'form.context'},
                     );
 
-    &Apache::lonnet::instructor_log('slotreservationslog',\%storehash,
-                                    '',$env{'user.name'},$env{'user.domain'},
-                                    $cnum,$cdom);
-    &Apache::lonnet::instructor_log($cdom.'_'.$cnum.'_slotlog',\%storehash,
-                                    1,$env{'user.name'},$env{'user.domain'},
-                                    $env{'user.name'},$env{'user.domain'});
+    &Apache::lonnet::write_log('course','slotreservationslog',\%storehash,
+                               '',$env{'user.name'},$env{'user.domain'},
+                               $cnum,$cdom);
+    &Apache::lonnet::write_log('course',$cdom.'_'.$cnum.'_slotlog',\%storehash,
+                               1,$env{'user.name'},$env{'user.domain'},
+                               $env{'user.name'},$env{'user.domain'});
 
     return;
 }
@@ -534,10 +538,10 @@ sub release_reservation {
                                action  => 'release',
                                context => $env{'form.context'},
                         );
-            &Apache::lonnet::instructor_log('slotreservationslog',\%storehash,
-                                            1,$uname,$udom,$cnum,$cdom);
-            &Apache::lonnet::instructor_log($cdom.'_'.$cnum.'_slotlog',\%storehash,
-                                            1,$uname,$udom,$uname,$udom);
+            &Apache::lonnet::write_log('slotreservationslog',\%storehash,
+                                       1,$uname,$udom,$cnum,$cdom);
+            &Apache::lonnet::write_log($cdom.'_'.$cnum.'_slotlog',\%storehash,
+                                       1,$uname,$udom,$uname,$udom);
 	}
     }
 
@@ -562,7 +566,11 @@ sub release_reservation {
     if ($mgr eq 'F') {
 	$msg = &mt('Released Reservation for user: [_1]',"$uname:$udom");
     } else {
-	$msg = &mt('Released Reservation: [_1]',$description);
+	$msg = '<span style="font-weight: bold;">'.&mt('Released reservation: [_1]',$description).'</span><br /><br />';
+        my $person = &Apache::loncommon::plainname($env{'user.name'},$env{'user.domain'});
+        my $subject = &mt('Reservation change: [_1]',$description);
+        my $msgbody = &mt('Reservation released by [_1] for [_2].',$person,$description);
+        $msg .= &slot_change_messaging($slot{'reservationmsg'},$subject,$msgbody,'release');
     }
     return (1,$msg);
 }
@@ -629,7 +637,6 @@ sub get_slot {
 	my $description1=&get_description($slot_name,\%slot);
 	%slot=&Apache::lonnet::get_slot($env{'form.slotname'});
 	my $description2=&get_description($env{'form.slotname'},\%slot);
-	$r->print('<p>'.&mt('Already have a reservation: [_1].',$description1).'</p>');
 	if ($slot_name ne $env{'form.slotname'}) {
 	    $r->print(<<STUFF);
 <form method="post" action="/adm/slotrequest">
@@ -638,19 +645,24 @@ sub get_slot {
    <input type="hidden" name="releaseslot" value="$slot_name" />
    <input type="hidden" name="command" value="change" />
 STUFF
-            $r->print('<p>'
-                     .&mt('You can either [_1]Change[_2] your reservation from [_3] to [_4] or'
-                         ,'<input type="submit" name="change" value="'
-                         ,'" />'
-                         ,'<b>'.$description1.'</b>'
-                         ,'<b>'.$description2.'</b>')
-                     .'<br /></p>'
-            );
-	    &return_link($r);
+            $r->print('<p class="LC_error">'.&mt('Reservation currently unchanged').'</p>');
+            if ($slot_name ne '') {
+                $r->print('<p>'.&mt('To complete the transaction you [_1]must confirm[_2] you want to [_3]process the change[_4] to [_5].'
+                         ,'<b>','</b>','<i>','</i>','<b>'.$description2.'</b>')
+                         .'<br />'
+                         .&mt('Or you can choose to [_1]make no change[_2] and continue[_2] with the reservation you already had: [_3].'
+                         ,'<i>','</i>','<b>'.$description1.'</b>')
+                         .'</p><p><span class="LC_nobreak">'
+                         .'<input type="submit" name="change" value="'.&mt('Process the change').'" />' 
+                         .('&nbsp;'x3)
+                         .'<input type="submit" name="nochange" value="'.&mt('Make no change').'" />'
+                         .'</span></p>');
+            }
 	    $r->print(<<STUFF);
 </form>
 STUFF
         } else {
+            $r->print('<p>'.&mt('Already have a reservation: [_1].',$description1).'</p>');
 	    &return_link($r);
 	}
 	return 0;
@@ -667,8 +679,15 @@ STUFF
                      .&mt('An error occurred while attempting to make a reservation. ([_1])',$1)
                      .'</span></p>');
 	} elsif ($reserved > -1) {
-	    $r->print('<p>'.&mt('Success: [_1]',$description).'</p>');
+	    $r->print('<p style="font-weight: bold;">'.&mt('Successfully signed up:  [_1]',$description).'</p>');
 	    $retvalue = 1;
+            my $person = &Apache::loncommon::plainname($env{'user.name'},$env{'user.domain'});
+            my $subject = &mt('Reservation change: [_1]',$description);
+            my $msgbody = &mt('Successful reservation by [_1] for [_2].',$person,$description);
+            my $msg = &slot_change_messaging($slot{'reservationmsg'},$subject,$msgbody,'reserve');
+            if ($msg) {
+                $r->print($msg);
+            }
 	} elsif ($reserved < 0) {
 	    $r->print('<p>'.&mt('Already reserved: [_1]',$description).'</p>');
 	}
@@ -741,6 +760,11 @@ sub allowed_slot {
     if ($slot->{'startreserve'} > time) {
 	return 0;
     }
+    # reserve time ended
+    if (($slot->{'endreserve'}) &&
+        ($slot->{'endreserve'} < time)) {
+        return 0;
+    }    
     &Apache::lonxml::debug("$slot_name reserve good");
 
     my $userallowed=0;
@@ -818,7 +842,7 @@ sub show_choices {
     my ($r,$symb,$formname)=@_;
 
     my ($cnum,$cdom)=&get_course();
-    my %slots=&Apache::lonnet::dump('slots',$cdom,$cnum);
+    my %slots = &Apache::lonnet::get_course_slots($cnum,$cdom);
     my $consumed_uniqueperiods = &get_consumed_uniqueperiods(\%slots);
     if (ref($consumed_uniqueperiods) eq 'HASH') {
         if (&Apache::lonnet::error(%$consumed_uniqueperiods)) {
@@ -847,17 +871,18 @@ sub show_choices {
 		      (keys(%slots)))  {
 
 	&Apache::lonxml::debug("Checking Slot $slot");
-	next if (!&allowed_slot($slot,$slots{$slot},undef,\%slots,
+	next if (!&allowed_slot($slot,$slots{$slot},$symb,\%slots,
 				$consumed_uniqueperiods));
 
         push(@available,$slot);
     }
     if (!@available) {
-        $output = &mt('No available times.');
+        $output = '<div class="LC_info">'.&mt('No available times.');
         if ($env{'form.command'} ne 'manageresv') {
             $output .= ' <a href="/adm/flip?postdata=return:">'.
                        &mt('Return to last resource').'</a>';
         }
+        $output .= '</div>';
         $r->print($output);
         return;
     }
@@ -1034,7 +1059,8 @@ sub show_table {
     my $available;
     if ($mgr eq 'F') {
     # FIXME: This line should be deleted once Slots uses breadcrumbs
-    $r->print(&Apache::loncommon::help_open_topic('Slot About', 'Help on slots'));
+    $r->print('<br />'.&Apache::loncommon::help_open_topic(
+        'Slot About', &mt('Help on slots')));
 
 	$r->print('<div>');
 	$r->print('<form method="post" action="/adm/slotrequest">
@@ -1050,11 +1076,11 @@ sub show_table {
     }
 
     if (!keys(%slots)) {
-        if ($crstype eq 'Community') {
-            $r->print('<div>'.&mt('No slots have been created in this community.').'</div>');
-        } else {
-            $r->print('<div>'.&mt('No slots have been created in this course.').'</div>');
-        }
+        $r->print(
+            '<p class="LC_info">'
+           .&mt('No slots have been created in this '.lc($crstype).'.')
+           .'</p>'
+        );
         return;
     }
     
@@ -1081,6 +1107,8 @@ sub show_table {
 	     'starttime'       => 'Start time',
 	     'endtime'         => 'End Time',
              'startreserve'    => 'Time students can start reserving',
+             'endreserve'      => 'Time students can no longer reserve',
+             'reservationmsg'  => 'Message triggered by reservation',
 	     'secret'          => 'Secret Word',
 	     'space'           => '# of students/max',
 	     'ip'              => 'IP or DNS restrictions',
@@ -1092,11 +1120,12 @@ sub show_table {
 	     'proctor'         => 'List of proctors');
     if ($crstype eq 'Community') {
         $show_fields{'startreserve'} = &mt('Time members can start reserving');
+        $show_fields{'endreserve'} = &mt('Time members can no longer reserve');
         $show_fields{'scheduled'} = &mt('Scheduled Members');
     }
     my @show_order=('name','description','type','starttime','endtime',
-		    'startreserve','secret','space','ip','symb',
-		    'allowedsections','allowedusers','uniqueperiod',
+		    'startreserve','endreserve','reservationmsg','secret','space',
+		    'ip','symb','allowedsections','allowedusers','uniqueperiod',
 		    'scheduled','proctor');
     my @show = 
 	(exists($env{'form.show'})) ? &Apache::loncommon::get_env_multiple('form.show')
@@ -1169,11 +1198,11 @@ sub show_table {
 						    6,\%stu_display_fields,
 						    \@stu_display_order).'
            </td>
-           <td valign="top">'.&Apache::loncommon::select_form($when,'when',%when_fields).
+           <td valign="top">'.&Apache::loncommon::select_form($when,'when',\%when_fields).
           '</td>
            <td valign="top">'.&Apache::loncommon::select_form($name_filter_type,
 						 'name_filter_type',
-						 %name_filter_type_fields).
+						 \%name_filter_type_fields).
 	      '<br />'.
 	      &Apache::lonhtmlcommon::textbox('name_filter_value',
 					      $env{'form.name_filter_value'},
@@ -1182,11 +1211,11 @@ sub show_table {
            <td valign="top">
             <table>
               <tr>
-                <td rowspan="2">Deleted slots:</td>
-                <td><label>'.$show_radio.'Show</label></td>
+                <td rowspan="2">'.&mt('Deleted slots:').'</td>
+                <td><label>'.$show_radio.&mt('Show').'</label></td>
               </tr>
               <tr>
-                <td><label>'.$hide_radio.'Hide</label></td>
+                <td><label>'.$hide_radio.&mt('Hide').'</label></td>
               </tr>
             </table>
 	  </td>
@@ -1207,7 +1236,7 @@ sub show_table {
 
     my %name_cache;
     my $slotsort = sub {
-	if ($env{'form.order'}=~/^(type|description|endtime|startreserve|ip|symb|allowedsections|allowedusers)$/) {
+	if ($env{'form.order'}=~/^(type|description|endtime|startreserve|endreserve|ip|symb|allowedsections|allowedusers|reservationmsg)$/) {
 	    if (lc($slots{$a}->{$env{'form.order'}})
 		ne lc($slots{$b}->{$env{'form.order'}})) {
 		return (lc($slots{$a}->{$env{'form.order'}}) 
@@ -1244,12 +1273,15 @@ sub show_table {
 	if ($tmp =~ /^error: /) { undef(%consumed); }
     }
 
+    my %msgops = &slot_reservationmsg_options();
+
     foreach my $slot (sort $slotsort (keys(%slots)))  {
 	if (!&to_show($slot,$slots{$slot},$when,
 		      $env{'form.deleted'},$name_filter)) { next; }
+        my $reservemsg;
 	if (defined($slots{$slot}->{'type'})
-	    && $slots{$slot}->{'type'} ne 'schedulable_student') {
-	    #next;
+	    && $slots{$slot}->{'type'} eq 'schedulable_student') {
+	    $reservemsg = $msgops{$slots{$slot}->{'reservationmsg'}};
 	}
 	my $description=&get_description($slot,$slots{$slot});
 	my ($id_count,$ids);
@@ -1286,6 +1318,8 @@ sub show_table {
 		 &Apache::lonlocal::locallocaltime($slots{$slot}->{'endtime'}):'');
 	my $start_reserve=($slots{$slot}->{'startreserve'}?
 			   &Apache::lonlocal::locallocaltime($slots{$slot}->{'startreserve'}):'');
+        my $end_reserve=($slots{$slot}->{'endreserve'}?
+                         &Apache::lonlocal::locallocaltime($slots{$slot}->{'endreserve'}):'');
 	
 	my $unique;
 	if (ref($slots{$slot}{'uniqueperiod'})) {
@@ -1393,6 +1427,12 @@ LOGLINK
 	if (exists($show{'startreserve'})) {
 	    $colspan++;$r->print("<td>$start_reserve</td>\n");
 	}
+        if (exists($show{'endreserve'})) {
+            $colspan++;$r->print("<td>$end_reserve</td>\n");
+        }
+        if (exists($show{'reservationmsg'})) {
+            $colspan++;$r->print("<td>$reservemsg</td>\n");
+        }
 	if (exists($show{'secret'})) {
 	    $colspan++;$r->print("<td>$slots{$slot}{'secret'}</td>\n");
 	}
@@ -1528,6 +1568,8 @@ sub manage_reservations {
                 } elsif ($slot_status == $resource->RESERVABLE) {
                     $msg=&mt('Reservation needed');
                     $get_choices = 1;
+                } elsif ($slot_status == $resource->RESERVABLE_LATER) {
+                    $msg=&mt('Reservation needed: will be reservable later.');
                 } elsif ($slot_status == $resource->NOTRESERVABLE) {
                     $msg=&mt('Reservation needed: none available.');
                 } elsif ($slot_status == $resource->UNKNOWN) {
@@ -2008,7 +2050,7 @@ sub get_resource_title {
                 $maptitle = $maptitles->{$mapurl};
             } else {
                 if ($mapurl eq $env{'course.'.$env{'request.course.id'}.'.url'}) {
-                    $maptitle=&mt('Main Course Documents');
+                    $maptitle=&mt('Main Content');
                 } else {
                     $maptitle=&Apache::lonnet::gettitle($mapurl);
                 }
@@ -2119,11 +2161,47 @@ sub display_filter {
     return $output;
 }
 
+sub slot_change_messaging {
+    my ($setting,$subject,$msg,$action) = @_;
+    my $user = $env{'user.name'};
+    my $domain = $env{'user.domain'};
+    my ($message_status,$comment_status);
+    if ($setting eq 'only_student'
+        || $setting eq 'student_and_user_notes_screen') {
+        $message_status =
+            &Apache::lonmsg::user_normal_msg($user,$domain,$subject,$msg);
+        $message_status = '<li>'.&mt('Sent to you: [_1]',
+                                    $message_status).' </li>';
+    }
+    if ($setting eq 'student_and_user_notes_screen') {
+        $comment_status =
+            &Apache::lonmsg::store_instructor_comment($subject.'<br />'.
+                                                      $msg,$user,$domain);
+        $comment_status = '<li>'.&mt('Entry added to course record (viewable by instructor): [_1]',
+                                    $comment_status).'</li>';
+    }
+    if ($message_status || $comment_status) {
+        my $msgtitle;
+        if ($action eq 'reserve') {
+            $msgtitle = &mt('Status of messages about saved reservation');
+        } elsif ($action eq 'release') {
+            $msgtitle = &mt('Status of messages about dropped reservation');
+        } elsif ($action eq 'nochange') {
+            $msgtitle = &mt('Status of messages about unchanged existing reservation');
+        }
+        return '<span class="LC_info">'.$msgtitle.'</span>'
+               .'<ul>'
+               .$message_status
+               .$comment_status
+               .'</ul><hr />';
+    }
+}
+
 sub upload_start {
     my ($r)=@_;    
     $r->print(
         &Apache::grades::checkforfile_js()
-       .'<h3>'.&mt('Specify a file containing the slot definitions.').'</h3>'
+       .'<h2>'.&mt('Upload a file containing the slot definitions').'</h2>'
        .'<form method="post" enctype="multipart/form-data"'
        .' action="/adm/slotrequest" name="slotupload">'
        .'<input type="hidden" name="command" value="csvuploadmap" />'
@@ -2157,16 +2235,40 @@ sub csvuploadmap_header {
 
     my $checked=(($env{'form.noFirstLine'})?' checked="checked"':'');
     my $ignore=&mt('Ignore First Line');
-	my $help_field = &Apache::loncommon::help_open_topic('Slot SelectingField');
+    my $buttontext = &mt('Reverse Association');
+
+    $r->print(
+        '<form method="post" enctype="multipart/form-data" action="/adm/slotrequest" name="slotupload">'
+       .'<h2>'.&mt('Identify fields in uploaded list').'</h2>'
+       .'<div class="LC_columnSection">'
+       .&Apache::loncommon::help_open_topic(
+            'Slot About',&mt('Help on slots'))
+       .' '.&Apache::loncommon::help_open_topic(
+            'Slot SelectingField',&mt('Help on selecting Fields'))
+       ."</div>\n"
+       .'<p class="LC_info">'
+       .&mt('Total number of records found in file: [_1]','<b>'.$distotal.'</b>')
+       ."</p>\n"
+    );
+    if ($distotal == 0) {
+        $r->print('<p class="LC_warning">'.&mt('None found').'</p>');
+    }
+    $r->print(
+        '<p>'
+       .&mt('Enter as many fields as you can.').'<br />'
+       .&mt('The system will inform you and bring you back to this page,[_1]if the data selected is insufficient to create the slots.','<br />')
+       .'</p>'
+    );
+    $r->print(
+        '<div class="LC_left_float">'
+       .'<fieldset><legend>'.&mt('Functions').'</legend>'
+       .'<label><input type="checkbox" name="noFirstLine"'.$checked.' />'.$ignore.'</label>'
+       .' <input type="button" value="'.$buttontext
+           .'" onclick="javascript:this.form.associate.value=\'Reverse Association\';submit(this.form);" />'
+       .'</fieldset></div><br clear="all" />'
+    );
 
     $r->print(<<ENDPICK);
-<form method="post" enctype="multipart/form-data" action="/adm/slotrequest" name="slotupload">
-<h3>Identify fields $help_field</h3>	
-Total number of records found in file: $distotal <hr />
-Enter as many fields as you can. The system will inform you and bring you back
-to this page if the data selected is insufficient to create the slots.<hr />
-<input type="button" value="Reverse Association" onclick="javascript:this.form.associate.value='Reverse Association';submit(this.form);" />
-<label><input type="checkbox" name="noFirstLine"$checked />$ignore</label>
 <input type="hidden" name="associate"  value="" />
 <input type="hidden" name="datatoken"  value="$datatoken" />
 <input type="hidden" name="fileupload" value="$env{'form.fileupload'}" />
@@ -2174,9 +2276,10 @@ to this page if the data selected is ins
 <input type="hidden" name="upfile_associate" 
                                        value="$env{'form.upfile_associate'}" />
 <input type="hidden" name="command"    value="csvuploadassign" />
-<hr />
 <script type="text/javascript" language="Javascript">
+// <![CDATA[
 $javascript
+// ]]>
 </script>
 ENDPICK
     return '';
@@ -2187,7 +2290,6 @@ sub csvuploadmap_footer {
     my ($request,$i,$keyfields) =@_;
     my $buttontext = &mt('Create Slots');
     $request->print(<<ENDPICK);
-</table>
 <input type="hidden" name="nfields" value="$i" />
 <input type="hidden" name="keyfields" value="$keyfields" />
 <input type="button" onclick="javascript:verify(this.form)" value="$buttontext" /><br />
@@ -2289,6 +2391,8 @@ sub csvupload_fields {
 	    ['starttime','Start Time of slot'],
 	    ['endtime','End Time of slot'],
 	    ['startreserve','Reservation Start Time'],
+            ['endreserve','Reservation End Time'],
+            ['reservationmsg','Message when reservation changed'],
 	    ['ip','IP or DNS restriction'],
 	    ['proctor','List of proctor ids'],
 	    ['description','Slot Description'],
@@ -2370,6 +2474,30 @@ sub csv_upload_assign {
 	    next;
 	}
 
+        if ($entries{$fields{'endreserve'}}) {
+            $slot{'endreserve'}=
+                &UnixDate($entries{$fields{'endreserve'}},"%s");
+        }
+        if (defined($slot{'endreserve'})
+            && $slot{'endreserve'} > $slot{'starttime'}) {
+            push(@errors,"$name not created -- Slot's reservation end time is after the slot's start time.");
+            next;
+        }
+
+        if ($slot{'type'} eq 'schedulable_student') {
+            if ($entries{$fields{'reservationmsg'}}) {
+                 if (($entries{$fields{'reservationmsg'}} eq 'only_student') ||
+                     ($entries{$fields{'reservationmsg'}} eq 'student_and_user_notes_screen')) {
+                      $slot{'reservationmsg'}=$entries{$fields{'reservationmsg'}};
+                 } else {
+                      unless (($entries{$fields{'reservationmsg'}} eq 'none') ||
+                              ($entries{$fields{'reservationmsg'}} eq '')) {
+                          push(@errors,"$name -- Slot's reservationmsg setting ignored - not one of: 'only_student', 'student_and_user_notes_screen', 'none' or ''");
+                      }
+                 }
+            }
+        }
+
 	foreach my $key ('ip','proctor','description','maxspace',
 			 'secret','symb') {
 	    if ($entries{$fields{$key}}) {
@@ -2394,6 +2522,9 @@ sub csv_upload_assign {
 	$r->rflush();
 	$countdone++;
     }
+    if ($countdone) {
+        &Apache::lonnet::devalidate_slots_cache($cname,$cdom); 
+    }
     $r->print('<p>'.&mt('Created [quant,_1,slot]',$countdone)."\n".'</p>');
     foreach my $error (@errors) {
 	$r->print('<p><span class="LC_warning">'.$error.'</span></p>'."\n");
@@ -2419,6 +2550,15 @@ sub slot_command_titles {
     return %titles;
 }
 
+sub slot_reservationmsg_options {
+    my %options = &Apache::lonlocal::texthash (
+                        only_student  => 'Sent to student',
+        student_and_user_notes_screen => 'Sent to student and added to user notes',
+                                 none => 'None sent and no record in user notes',
+    );
+    return %options;
+}
+
 sub handler {
     my $r=shift;
 
@@ -2478,8 +2618,9 @@ sub handler {
             if (ref($brcrum) eq 'ARRAY') {
                 push(@{$brcrum},{href=>"/adm/slotrequest?command=$env{'form.command'}",text=>$crumb_titles{$env{'form.command'}}});
             }
-            
         }
+    } else {
+        $brcrum =[];
     }
     &start_page($r,$title,$brcrum);
 
@@ -2548,7 +2689,26 @@ sub handler {
 	} elsif ($env{'form.command'} eq 'get') {
 	    &get_slot($r,$symb);
 	} elsif ($env{'form.command'} eq 'change') {
-	    if (&get_slot($r,$symb,$env{'form.releaseslot'},1)) {
+            if ($env{'form.nochange'}) {
+                my $slot_name = $env{'form.releaseslot'};
+                my @slots = &check_for_reservation($symb,'allslots');
+                my $msg;
+                if (($slot_name ne '') && (grep(/^\Q$slot_name\E/,@slots))) { 
+                     my %slot=&Apache::lonnet::get_slot($env{'form.releaseslot'});
+                     my $description=&get_description($slot_name,\%slot);
+                     $msg = '<span style="font-weight: bold;">'.
+                            &mt('Unchanged reservation: [_1]',$description).'</span><br /><br />';
+                     my $person = 
+                         &Apache::loncommon::plainname($env{'user.name'},$env{'user.domain'});
+                     my $subject = &mt('Reservation unchanged: [_1]',$description);
+                     my $msgbody = &mt('No change to existing registration by [_1] for [_2].',$person,$description);
+                     $msg .= &slot_change_messaging($slot{'reservationmsg'},$subject,$msgbody,'nochange');
+                } else {
+                    $msg = '<span class="LC_warning">'.&mt('Reservation no longer reported as available.').'</span>';
+                }
+                $r->print($msg);
+                &return_link($r);
+	    } elsif (&get_slot($r,$symb,$env{'form.releaseslot'},1)) {
 		&release_slot($r,$symb,$env{'form.releaseslot'});
 	    }
 	} else {