JI-1059 Add request queue events

Add dialog texts

h5p.classes.php

@@ -3483,6 +3483,10 @@ class H5PCore {
       'connectionLost' => $this->h5pF->t('Connection lost. Results will be stored and sent when you regain connection.'),
       'connectionReestablished' => $this->h5pF->t('Connection reestablished.'),
       'resubmitScores' => $this->h5pF->t('Attempting to submit stored results.'),
+      'offlineDialogHeader' => $this->h5pF->t('Your connection to the server was lost'),
+      'offlineDialogBody' => $this->h5pF->t('We were unable to send information about your completion of this task. Please check your internet connection.'),
+      'offlineDialogRetryMessage' => $this->h5pF->t('Retrying in :num....'),
+      'offlineDialogRetryButtonLabel' => $this->h5pF->t('Retry now'),
     );
   }
 }

js/h5p.js

@@ -66,6 +66,21 @@ H5P.init = function (target) {
     H5P.$body = H5P.jQuery(document.body);
   }
 
+  H5P.offlineRequestQueue = new H5P.RequestQueue();
+  // We could handle previously failed requests here, instead we throw them away
+  // TODO: Add dialog
+  H5P.offlineRequestQueue.clear();
+  H5P.offlineRequestQueue.on('requestQueued', function () {
+  });
+
+  H5P.offlineRequestQueue.on('processingQueue', function () {
+  });
+
+  H5P.offlineRequestQueue.on('queueEmptied', function () {
+  });
+
+
+
   // Determine if we can use full screen
   if (H5P.fullscreenSupported === undefined) {
     /**
@@ -214,9 +229,6 @@ H5P.init = function (target) {
       }
     });
 
-    // Handle requests that failed while the user was offline
-    H5P.offlineRequestQueue.resumeQueue();
-
     // Listen for xAPI events.
     H5P.on(instance, 'xAPI', H5P.xAPICompletedListener);
 

js/request-queue.js

@@ -3,19 +3,18 @@
  *
  * @type {RequestQueue}
  */
-H5P.RequestQueue = (function ($) {
+H5P.RequestQueue = (function ($, EventDispatcher) {
   /**
    * A queue for requests, will be automatically processed when regaining connection
    *
-   * @param {string} itemName Name that requests will be stored as in local storage
-   * @param {string} eventName Name of event that will be triggered when a new item is added to the queue
+   * @param {boolean} [options.showToast] Disable showing toast when losing or regaining connection
    * @constructor
    */
-  const RequestQueue = function (itemName, eventName) {
+  const RequestQueue = function (options) {
+    EventDispatcher.call(this);
     this.processingQueue = false;
 
-    this.itemName = itemName;
-    this.eventName = eventName;
+    this.showToast = options.showToast;
 
     // Initialize listener for when requests are added to queue
     window.addEventListener('offline', this.updateOnlineStatus.bind(this));
@@ -46,7 +45,7 @@ H5P.RequestQueue = (function ($) {
 
     window.localStorage.setItem(this.itemName, JSON.stringify(storedStatements));
 
-    H5P.externalDispatcher.trigger(this.eventName);
+    this.trigger('requestQueued', storedStatements);
     return true;
   };
 
@@ -84,21 +83,23 @@ H5P.RequestQueue = (function ($) {
 
   /**
    * Start processing of requests queue
+   *
+   * @return {boolean} Returns false if it was not possible to resume processing queue
    */
   RequestQueue.prototype.resumeQueue = function () {
     // Not supported
     if (!H5PIntegration || !window.navigator || !window.localStorage) {
-      return;
+      return false;
     }
 
     // Already processing
     if (this.processingQueue) {
-      return;
+      return false;
     }
 
     // Application is offline, re-send when we detect a connection
     if (!window.navigator.onLine) {
-      return;
+      return false;
     }
 
     // We're online, attempt to send queued requests
@@ -110,7 +111,7 @@ H5P.RequestQueue = (function ($) {
 
     // No items left in queue
     if (!queueLength) {
-      return;
+      return true;
     }
 
     // Make sure requests are not changed while they're being handled
@@ -118,6 +119,7 @@ H5P.RequestQueue = (function ($) {
 
     // Process queue in original order
     this.processQueue(queue);
+    return true
   };
 
   /**
@@ -130,6 +132,8 @@ H5P.RequestQueue = (function ($) {
       return;
     }
 
+    this.trigger('processingQueue');
+
     // Make sure the requests are processed in a FIFO order
     const request = queue.shift();
 
@@ -151,6 +155,11 @@ H5P.RequestQueue = (function ($) {
     }
   };
 
+  /**
+   * An item in the queue was processed
+   *
+   * @param {Array} queue Queue that was processed
+   */
   RequestQueue.prototype.onQueuedRequestProcessed = function (queue) {
     if (queue.length) {
       this.processQueue(queue);
@@ -167,7 +176,11 @@ H5P.RequestQueue = (function ($) {
     const requestQueue = this.getStoredRequests();
     if (requestQueue.length) {
       this.resumeQueue();
+      return;
     }
+
+    // Run empty queue callback
+    this.trigger('queueEmptied');
   };
 
   /**
@@ -207,10 +220,10 @@ H5P.RequestQueue = (function ($) {
       this.resumeQueue();
     }
 
+    if (this.showToast) {
       this.displayToastMessage(message);
+    }
   };
 
   return RequestQueue;
-})(H5P.jQuery);
-
-H5P.offlineRequestQueue = new H5P.RequestQueue('requestQueue', 'requestQueued');
+})(H5P.jQuery, H5P.EventDispatcher);