"Changes made to the AngularJS $scope are not being reflected in the DOM

Here are the snippets of code I am working with:

The state (abbreviated for simplicity)

.state('foo', {
    url: '/foo',
    templateUrl: 'path/to/template.html',
    controller:'fooCtrl',
})

The controller

controller = function($scope){
    // not the actual code
    $scope.barCount
}

template.html

<div>
    <span>{{ barCount }}</span> // this is updating properly
</div>

Other html partial

<div ng-controller="fooCtrl">
    <span>{{ barCount }}</span> // this is **NOT** updating properly
</div>

I have a scope variable in my controller. The 2-way binding works fine in the template linked to the state along with the controller, but not in the other template where I use ng-controller to bind it.

Could this be a bug? Or am I overlooking something here? Thank you.

Answer №1

When working with AngularJS, it's important to remember that each time you use ng-controller or declare a controller in different views, a new instance of that controller is created. This means that all controllers exist within their own unique scopes.

To efficiently share data between controllers, services are the best option. Services in AngularJS are singletons, meaning they only have one instance throughout the application.

Here's an example:

angular.module('app')

.factory('fooService', [function(){
  var bar = 'Shared Data';
  return {
    getBar: function(){
      return bar;
    }
  };
}])

.controller('FooController', ['fooService', function(fooService){
  this.barCount = fooService.getBar();
}];

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