New Twiddle

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  isFalse: false,
  
  actions: {
  	onSubmit() { alert('SUBMITTED'); }
	}
});

application.template.hbs

<form {{action "onSubmit" on="submit"}}>
	<button type="submit" {{action "c" preventDefault=false}}>
  	OK!
  </button>
  
  <button type="submit" {{action "c" preventDefault=isFalse}}>
  	NOT OK!
  </button>
</form>

twiddle.json

{
  "version": "0.4.17",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}