Is it feasible to maintain a variable as a reference across views while utilizing ng-view?

I am facing a unique challenge: I have a webpage with two tabs that need to utilize ng-view from AngularJS. The twist is that both tabs must share the same variable, similar to referencing a variable in C# using the "ref" keyword.

If you want to see an example of what I mean, please check out the Using object section of this demo: http://plnkr.co/edit/zZfUQN?p=preview

<h3>Using object:</h3>
<div class="example">
  <img class="mainImg" ng-src="{{mainImg.url}}" />
  <p>This is the parent scope with the main image.</p>
  <p>$scope.mainImg.url == {{mainImg.url}}</p>
  <div class="thumbs">
    <p>Thumbs generated with ng-repeat, with ng-click setting <strong>$scope.mainImg.url</strong> (click on them to see what happens):</p>
    <div class="thumbDiv" ng-repeat="img in images">
      <img class="thumb" ng-src="{{img}}" ng-click="mainImg.url = img" />
      <p>This is a child scope generated by ng-repeat.</p>
      <p>$scope.mainImg.url == {{mainImg.url}}</p>
    </div>
  </div>
</div>

In essence, the main page serves as the container and the tabs act as children. The challenge lies in maintaining a shared variable reference between these children to ensure they all use the same value.

-- EDIT

I neglected to mention a crucial point: the reference variable can be modified by one child, and the updated value must be synchronized across other children. Thank you for your assistance,

Karine

Answer №1

To achieve this, you can utilize the $rootScope in AngularJS. Scopes allow for inheritance, meaning that any variables defined in a parent scope can be accessed in child scopes if not overridden.

function MainController($scope, $rootScope) {
    $rootScope.sharedVar = 'Hello';
}

function Child1Controller($scope, $rootScope) {
    //access $rootScope.sharedVar;
}

function Child2Controller($scope, $rootScope) {
    //access $rootScope.sharedVar;
}

UPDATE: Another approach, as suggested by Anthony Chu, is to create a service that can be injected into controllers requiring access to the shared value.

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