AngularJS using $apply without $scope

Question

I started working with AngularJS and I embraced the convention for writing controllers with this, not with $scope. So my controllers look like this:

myApp.controller("SomeController", function(){
    this.myModel={id:-1, name:"empty"};
});

<div ng-controller="SomeController as ctrl">
    <input type="text" ng-model="ctrl.myModel.name" />
</div>

Now, I changed the myModel object in the controller in a way like this:

this.myModel=someOtherObjectFromAForeignSource;

... and the value inside the input control doesn't change. I read about the $apply function and it's use but since i use the "this" convention, I don't have a $scope variable.

How do I call the $apply method?

Why do you think you need $apply()? Where does that other data come from? - Your input is also set to the name property - does your new object contain that property? — tymeJV
– tymeJV, Commented Dec 19, 2014 at 14:35
Yes, it contains the name property - this new object is coming from a 3rd party control, and angular can't register the change automatically. Anyway, my question is still how to use the $apply method without the use of $scope? — Mateo Velenik
– Mateo Velenik, Commented Dec 19, 2014 at 14:40
Can you post the code where you do this.myModel=someOtherObjectFromAForeignSource;. Because the model should be updated IF you are not using a third party library in your controller (like jQuery). — L105
– L105, Commented Dec 19, 2014 at 14:47
There is apply() method in javascript. consider using that.. — Ved
– Ved, Commented Dec 19, 2014 at 14:48

Brocco · Accepted Answer · 2014-12-19 14:55:37Z

17

You can certainly still use $scope with the controller as syntax with no issue.

In fact that is how you would handle events ($on, $broadcast, $emit) just inject it into your controller:

app.controller('MyCtrl', function($scope){
   //set your properties/methods as you are
   this.message = 'foo';
   this.yell = function(){
     this.message = this.message.toUpperCase() + '!!!';
   };

  var vm = this;
  //and use $apply as needed
  somethingOutsideOfAngular(function(value){
    $scope.$apply(function(){
      vm.message = value;
    });
  });
});

edited Dec 19, 2014 at 14:55

answered Dec 19, 2014 at 14:49

Brocco

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6 Comments

Mateo Velenik Over a year ago

So I still need to inject $scope if I want to use $apply? I tried it like this and it certainly works but I thought there was another way.

Brocco Over a year ago

Meteo, that is correct, because $apply is a method on the $scope object.

Mateo Velenik Over a year ago

It isn't exactly the answer I wanted but OK - do you perhaps know where could I confirm that you really NEED to inject $scope for $apply?

Brocco Over a year ago

The documentation for $apply which states that it is a method upon the Scope object is here docs.angularjs.org/api/ng/type/$rootScope.Scope#$apply And since based upon your need to call $apply the only way to get to it is the actual Scope object by injecting $scope

Yerken Over a year ago

This is certainly a limitatiom of using controllerAs syntax, because you will have to inject and invoke $scope anyway as shown in the answer

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