Improve handle of network connection errors (fix #203)

src/mibew/js/source/default/server.js

@@ -41,6 +41,8 @@
             // Pause before restarting updater using Server.restartUpdater
             // function (in seconds)
             reconnectPause: 1,
+            // Call on successful response
+            onReceiveResponse: function() {},
             // Call on request timeout
             onTimeout: function() {},
             // Call when transport error was caught
@@ -371,6 +373,8 @@
      * @private
      */
     Mibew.Server.prototype.receiveResponse = function(data, textStatus, jqXHR) {
+        // Call hook on successful request
+        this.options.onReceiveResponse();
         // Do not parse empty responses
         if (data == '') {
             this.updateAfter(this.options.requestsFrequency);

src/mibew/js/source/default/utils.js

@@ -197,7 +197,7 @@
             // Do not open alert if one already opened.
             return;
         }
-        vex.dialog.alert({message: sanitizeMessage(message)});
+        return vex.dialog.alert({message: sanitizeMessage(message)});
     };
 
     /**
@@ -230,4 +230,12 @@
         });
     };
 
+    /**
+     * Close alert.
+     * @param {Object} alert instance.
+     */
+    Mibew.Utils.closeAlert = function(alertInstance) {
+        var res = vex.close(alertInstance.id);
+    };
+
 })(Mibew, jQuery, _, vex, validator);

src/mibew/js/source/users/app.js

@@ -24,6 +24,12 @@
      */
     var badRequestsCount = 0;
 
+    /**
+     * Represent alert object for network problems notification
+     * @type Object
+     */
+     var networkProblemsAlert = null;
+
     /**
      * Increase badRequestsCount and show reconnect message if need.
      * Calls on every bad request.
@@ -32,12 +38,24 @@
         // Increase bad requests count
         badRequestsCount++;
         // Check if there is
-        if (badRequestsCount == 10) {
+        if (!networkProblemsAlert && (badRequestsCount == 10)) {
-            Mibew.Utils.alert(Mibew.Localization.trans('Network problems detected. Please refresh the page.'));
+            networkProblemsAlert = Mibew.Utils.alert(Mibew.Localization.trans('Network problems detected. Please refresh the page.'));
             badRequestsCount = 0;
         }
     };
 
+    /**
+     * Reset badRequestsCount and close reconnect message if need.
+     * Calls on every successful request.
+     */
+    var successfulResponseHandler = function() {
+        badRequestsCount = 0;
+        if (networkProblemsAlert) {
+            Mibew.Utils.closeAlert(networkProblemsAlert);
+        }
+        networkProblemsAlert = null;
+    }
+
     // Create application instance
     var App = new Backbone.Marionette.Application();
 
@@ -61,7 +79,8 @@
             {
                 'interactionType': MibewAPIUsersInteraction,
                 onTimeout: requestErrorHandler,
-                onTransportError: requestErrorHandler
+                onTransportError: requestErrorHandler,
+                onReceiveResponse: successfulResponseHandler,
             },
             options.server
         ));