New Twiddle

application.template.hbs

{{foo-bar bar=whatever}}

foo-bar.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  foo: false,
  bar: false,
  
  classNameBindings: [':foo-bar', 'foo'],
  
  onRerendered: function() {
		$('body').append('did render!<br/>');
  }.on('didRender'),
  
  actions: {
    toggleFoo: function() {
      this.toggleProperty('foo');
    },
    toggleBar: function() {
      this.toggleProperty('bar');
    }
  }
});

foo-bar.template.hbs

<button {{action "toggleFoo"}}>Touch foo</button>
<button {{action "toggleBar"}}>Touch bar</button>

styles.app.css

.foo-bar {
  padding: 10px;
  border: 3px solid black;
  background-color: purple;
}

.foo-bar.foo {
  background-color: cyan;
}

twiddle.json

{
  "version": "0.4.17",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "1.13.11",
    "ember-data": "1.13.15",
    "ember-template-compiler": "1.13.11"
  }
}