Angular.js “Controller as …” + $scope.$on

Question

If i\'d like to use the \"Controller as ...\" syntax in Angular, how should I approach things like $scope.$on(...) that i need to put inside the controller?

I get a

Answer 1

Inject $scope and your controller is accessible by whatever you named it

EG:

$stateProvider
  .state('my-state', {
    ...
    controller: 'MyCtrl',
    controllerAs: 'ctrl',
    ...
  });



.controller('MyCtrl', function($scope) {
  var $this = this;
  $scope.$on('ctrl.data', function(new, old) {
    // whatevs
  });
  $timeout(function() {
    $this.data = 'changed';
  }, 1000);
});

Answer 2

As far as I know, you need to inject $scope if you want $scope watchers/methods. ControllerAs is just syntactic sugar to enable to see more clearly the structure of your nested controllers.

Three ideas though which may simplify your code.

1. Use var vm = this, in order to get rid of the bind(this).

   var vm = this;
   vm.whereAmINow = "/";
   
   $scope.$on('$locationChangeStart', function(event) {
       vm.whereAmINow = $location.path();
   });
   
   vm.jumpTo = function(where) {
       $location.path(where);
   }
   

2. The whole whereamINow variable makes sense putting it into the initialization of app aka .run() (before config) since I assume it's a global variable and you don't need to use a $scope watcher/method for it.

3. Another option is to use a factory to make the changes persist, so you simply create a location factory which holds the current active path.

Answer 3

Ok, i think people just do the same, just as in this question:

Replace $scope with "'controller' as" syntax