Refresh the angular scope when events are triggered

I am integrating a web service client into an angular service. This specific client sends out events for certain updates like this:

app.service('AngularClient', function () {
  this.info = null
  this.login = function () {
    client.login(loginInfo).then(function (loggedClient) {
      loggedClient.on('newInfo', function (info) {
        this.info = info
      })
    })
  }
})

A controller utilizes this service and connects it to its $scope:

app.controller('Ctrl', function (AngularClient, $scope) {
   $scope.client = AngularClient
})

However, whenever the 'newInfo' event is triggered, angular does not automatically initiate a digest cycle, preventing me from controlling when the info is updated in the UI. How can I ensure that this happens every time in an angular way?

javascriptangularjsangularjs-serviceangularjs-digest

Answer №1

If you're looking to continue receiving updates for the login event, one way to achieve this is by implementing the following code snippet:

app.service('AngularClient', function () {
  this.info = null
  this.loginCallback = null
  this.login = function () {
    client.login(loginInfo).then(function (loggedClient) {
      loggedClient.on('newInfo', function (info) {
        this.info = info
        if (this.loginCallback) this.loginCallback(info);
      })
    })
  }
})

app.controller('Ctrl', function (AngularClient, $scope) {
   $scope.client = AngularClient
   AngularClient.loginCallback = function(info, err){ // optional error
     $scope.user.property = info.property;
     $scope.$apply();
   }
})

Answer №2

When using custom asynchronous methods in Angular, the framework may not automatically detect when it needs to digest again.

To work around this issue, you can utilize `$scope.$apply()`. However, keep in mind that $scope is not directly accessible within your service. One approach is to wrap the function that is being listened to by an event inside an `$apply()` block within your controller:

$scope.$apply(function () {
    //your code here.
});

For more information on this topic, you can visit this link.

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