New Twiddle

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  actions: {
    add(x, y) {
      alert('this is done right '+x+ ' ' + y);
    }
  }
});

application.template.hbs

<br><h1>alpha template</h1>
<div>
 <label>X value</label>
 {{input value=xValue}}
 <label>Y</label>
 {{input value=yValue}}
 <input type="button" id ="add-button" value="Add" {{action 'add' xValue yValue}}/>
</div>

twiddle.json

{
  "version": "0.4.11",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.9/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.11/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.9/ember-template-compiler.js"
  }
}