AngularNetworkUtils.js

  app.run(function($window, $rootScope) {
      $rootScope.online = navigator.onLine;

      /**
      Generate event offline when user disconnects from Internet
        $scope.$watch('offline', function(newStatus) { ... });
      **/
      $window.addEventListener("offline", function() {
        $rootScope.$apply(function() {
          $rootScope.online = false;
        });
      }, false);

      /**
      Generate event online when user connects from Internet
        $scope.$watch('online', function(newStatus) { ... });
      **/
      $window.addEventListener("online", function() {
        $rootScope.$apply(function() {
          $rootScope.online = true;
        });
      }, false);
    });