MDL-58926 quiz: Addition of AJAX based quiz timer.

mod/quiz/autosave.ajax.php

@@ -61,4 +61,15 @@
 
 $attemptobj->process_auto_save($timenow);
 $transaction->allow_commit();
-echo 'OK';
+
+// Calculate time remaining.
+$timeleft = $attemptobj->get_time_left_display($timenow);
+
+// Build response, only returning timeleft if quiz in-progress
+// has a time limit.
+$r = new stdClass();
+$r->status = "OK";
+if ($timeleft !== false) {
+    $r->timeleft = $timeleft;
+}
+echo json_encode($r);

mod/quiz/module.js

@@ -58,6 +58,9 @@ M.mod_quiz.timer = {
     // so we can cancel.
     timeoutid: null,
 
+    // Threshold for updating time remaining, in milliseconds.
+    threshold: 3000,
+
     /**
      * @param Y the YUI object
      * @param start, the timer starting time, in seconds.
@@ -130,6 +133,18 @@ M.mod_quiz.timer = {
 
         // Arrange for this method to be called again soon.
         M.mod_quiz.timer.timeoutid = setTimeout(M.mod_quiz.timer.update, 100);
+    },
+
+    // Allow the end time of the quiz to be updated.
+    updateEndTime: function(timeleft) {
+        var newtimeleft = new Date().getTime() + timeleft * 1000;
+
+        // Only update if change is greater than the threshold, so the
+        // time doesn't bounce around unnecessarily.
+        if (Math.abs(newtimeleft - M.mod_quiz.timer.endtime) > M.mod_quiz.timer.threshold) {
+            M.mod_quiz.timer.endtime = newtimeleft;
+            M.mod_quiz.timer.update();
+        }
     }
 };
 

mod/quiz/yui/build/moodle-mod_quiz-autosave/moodle-mod_quiz-autosave-debug.js

@@ -358,13 +358,19 @@ M.mod_quiz.autosave = {
     },
 
     save_done: function(transactionid, response) {
-        if (response.responseText !== 'OK') {
+        var autosavedata = JSON.parse(response.responseText);
+        if (autosavedata.status !== 'OK') {
             // Because IIS is useless, Moodle can't send proper HTTP response
             // codes, so we have to detect failures manually.
             this.save_failed(transactionid, response);
             return;
         }
 
+        if (typeof autosavedata.timeleft !== 'undefined') {
+            Y.log('Updating timer: ' + autosavedata.timeleft + ' seconds remain.', 'debug', 'moodle-mod_quiz-timer');
+            M.mod_quiz.timer.updateEndTime(autosavedata.timeleft);
+        }
+
         Y.log('Save completed.', 'debug', 'moodle-mod_quiz-autosave');
         this.save_transaction = null;
 

mod/quiz/yui/build/moodle-mod_quiz-autosave/moodle-mod_quiz-autosave.js

@@ -350,13 +350,18 @@ M.mod_quiz.autosave = {
     },
 
     save_done: function(transactionid, response) {
-        if (response.responseText !== 'OK') {
+        var autosavedata = JSON.parse(response.responseText);
+        if (autosavedata.status !== 'OK') {
             // Because IIS is useless, Moodle can't send proper HTTP response
             // codes, so we have to detect failures manually.
             this.save_failed(transactionid, response);
             return;
         }
 
+        if (typeof autosavedata.timeleft !== 'undefined') {
+            M.mod_quiz.timer.updateEndTime(autosavedata.timeleft);
+        }
+
         this.save_transaction = null;
 
         if (this.dirty) {

mod/quiz/yui/src/autosave/js/autosave.js

@@ -356,13 +356,19 @@ M.mod_quiz.autosave = {
     },
 
     save_done: function(transactionid, response) {
-        if (response.responseText !== 'OK') {
+        var autosavedata = JSON.parse(response.responseText);
+        if (autosavedata.status !== 'OK') {
             // Because IIS is useless, Moodle can't send proper HTTP response
             // codes, so we have to detect failures manually.
             this.save_failed(transactionid, response);
             return;
         }
 
+        if (typeof autosavedata.timeleft !== 'undefined') {
+            Y.log('Updating timer: ' + autosavedata.timeleft + ' seconds remain.', 'debug', 'moodle-mod_quiz-timer');
+            M.mod_quiz.timer.updateEndTime(autosavedata.timeleft);
+        }
+
         Y.log('Save completed.', 'debug', 'moodle-mod_quiz-autosave');
         this.save_transaction = null;