The wonders of AngularJS: understanding promises and the power of nested

Here's the scenario I'm dealing with:

Consider having two nested controllers structured like this:

Controller1
   Controller2

In Controller1, there is a field

someDataService.getMyUser().then(function(user){      
   $scope.user = user;
}

This field retrieves data from an external server asynchronously. Everything seems fine so far. However, how can I handle the following situation:

I require the use of

var userName = $scope.$parent.user.userName 

in Controller2 immediately when it initiates. How do I ensure that the second controller waits for the promise in the first controller to be resolved before assigning the value to var userName? Otherwise, $scope.$parent would return as undefined)

Answer №1

Have you considered creating a function like $scope.$parent.get_user() instead of continuously calling $scope.$parent.user.userName? This function could then call someDataServive.getMyUser() and return a promise.

Alternatively, would it be preferable to inject someDataService into Controller2 and directly call the getMyUser() function from there?

Answer №2

While it's not ideal to have a dependency in this manner, there is a workaround that can be used. By utilizing $broadcast, you can trigger the initialization code of Controller2 directly from Controller1 when the object is loaded.

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