Difficulty arises in AngularJS Material when attempting to access the same object value using ng-model and ng-change

I'm working with angular-material and facing an issue with an md-switch element. The model of the switch is determined by a value in a JavaScript object. However, I want to avoid directly changing the object value when the user toggles the switch. Instead, I would like to call a function within the object that will handle the value change for me.

In the provided code snippet (or JSFiddle link below), you can observe that the toggle state remains unchanged.

While this example may be simplified, it raises the question of whether such functionality is achievable?

See the sample code below:

HTML

<div class="inset switchdemoBasicUsage" ng-controller="SwitchDemoCtrl" ng-cloak="" ng-app="MyApp">
  <md-switch ng-model="data.state" aria-label="Switch 2" class="md-primary" ng-change="data.change()">
    {{ data.state }}
  </md-switch>
</div>

JS

angular.module('MyApp',['ngMaterial', 'ngMessages', 'material.svgAssetsCache'])
.controller('SwitchDemoCtrl', function($scope) {
  $scope.data = {
    state: true,
    change: function() {
      this.state = !this.state;
    }
  };
});

Here is the JSFiddle link for reference: http://jsfiddle.net/wx8s709z/

Answer №1

The issue does not lie in its lack of change, but rather in the fact that you alter it twice. The initial modification occurs upon clicking, and the subsequent adjustment is made by your function. If you were to comment out the code within the called function, you would observe that everything functions as intended.

ng-change serves as an event notification signaling a change in value, prompting you to execute another function using $scope.data.state exclusively.

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