Fix #405 New feature to allow better control of "set all" status values.

allows the ability to only set unselected items.

lang/en/attendance.php

@@ -440,8 +440,8 @@ $string['sessiontype'] = 'Type';
 $string['sessiontypeshort'] = 'Type';
 $string['sessionupdated'] = 'Session successfully updated';
 $string['set_by_student'] = 'Self-recorded';
-$string['setallstatuses'] = 'Set status for all users';
+$string['setallstatuses'] = 'Set status for';
-$string['setallstatusesto'] = 'Set status for all users to «{$a}»';
+$string['setallstatusesto'] = 'Set status to «{$a}»';
 $string['setperiod'] = 'Specified time in minutes to release IP';
 $string['settings'] = 'Settings';
 $string['setunmarked'] = 'Automatically set when not marked';

renderer.php

@@ -663,7 +663,12 @@ class mod_attendance_renderer extends plugin_renderer_base {
             $PAGE->requires->js_amd_inline("
                 require(['jquery'], function($) {
                     $('#radiocheckstatus".$st->id."').click(function(e) {
+                        if (e.shiftKey) {
                             $('#attendancetakeform').find('.st".$st->id."').prop('checked', true);
+                        }
+                        else {
+                            $('#attendancetakeform').find('input:indeterminate.st".$st->id."').prop('checked', true);
+                        }
                     });
                 });");
         }
@@ -729,7 +734,12 @@ class mod_attendance_renderer extends plugin_renderer_base {
             $PAGE->requires->js_amd_inline("
                  require(['jquery'], function($) {
                      $('#checkstatus".$st->id."').click(function(e) {
+                         if (e.shiftKey) {
+                             $('#attendancetakeform').find('input:indeterminate.st".$st->id."').prop('checked', true);
+                         }
+                         else {
                              $('#attendancetakeform').find('.st".$st->id."').prop('checked', true);
+                         }
                          e.preventDefault();
                      });
                  });");