CTP-4114 Fix: Cannot add jQuery after page output! (#39)

Fix warning "Can not add jQuery plugins after starting page output!"
when on course's Default Activity Completion page
(course/defaultcompletion.php).

mod_form.php

@@ -44,17 +44,21 @@ public function definition() {
 
         global $PAGE, $CFG;
 
-        $PAGE->requires->jquery();
-
-        $module = [
-            'name' => 'mod_coursework',
-            'fullpath' => '/mod/coursework/mod_form.js',
-            'requires' => [
-                'node',
-                'ajax',
-            ]];
-
-        $PAGE->requires->js_init_call('M.mod_coursework.init', [], true, $module);
+        // Don't include jQuery when not on this module's settings page, for
+        // example, if on the default activity completion page.  See MDL-78528.
+        if ($PAGE->pagetype === 'mod-coursework-mod') {
+            $PAGE->requires->jquery();
+
+            $module = [
+                'name' => 'mod_coursework',
+                'fullpath' => '/mod/coursework/mod_form.js',
+                'requires' => [
+                    'node',
+                    'ajax',
+                ]];
+
+            $PAGE->requires->js_init_call('M.mod_coursework.init', [], true, $module);
+        }
 
         $this->set_form_attributes();