Stackoverflow-33767477

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  package: {isChecked: false},
  actions: {
  checkboxAlert(){ 
    return confirm('are you sure?');
  }
  }
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
Value of checkbox: {{package.isChecked}}
<p>
  <label>{{input type="checkbox" click=(action 'checkboxAlert' )  checked=package.isChecked }}Change</label>
</p>
<br>
<br>

twiddle.json

{
  "version": "0.4.16",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.1.0",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.1.0/ember-data.js",
    "ember-template-compiler": "2.1.0"
  }
}