Utilizing Shared Models Across Nested ng-Change Controllers

Within my AngularJS application, I am faced with the challenge of utilizing a value from an input/dropdown field in the second controller when a change event occurs. The structure of my code is as follows:

Code snippet (HTML) ::

<body ng-app="myApp" ng-controller="DropdownCtrl">
   <input type="text" class="form-control" ng-model="dt" ng-change="changeDate(dt)" /> 
   <span class="input-group-btn">
      <button type="button" class="btn btn-default" ng-click="open($event)">
          <i class="glyphicon glyphicon-calendar"></i>
      </button>
   </span>      

    <div class="row"  ng-controller="MainCtrl"> 
      <!-- other code -->
    </div>
</body>

My objective is to access the value from the changeDate(dt) function in the MainCtrl when a change event occurs.

Answer №1

If a parent controller wants to communicate with a child controller, it can achieve this by using the command

$scope.$broadcast('changedValue', dt);

By doing this, the parent controller will broadcast the new value of dt to all child controllers. The child controller can then listen for the change using this code:

$scope.$on('parent-message', function (event, dt) {
    // You can now utilize dt in the child controller for your requirements
});

This technique is particularly useful when working with routeProviders and ng-view.

For further explanation on this topic, take a look at this informative tutorial.

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