http://stackoverflow.com/questions/43183810/nothing-handled-the-action-addpost-in-ember-js/43184053

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  actions:{
    addPost(){
      //console.log('hi');
      alert(' hi from addPost method');
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<form>
<lable>Enter the post</lable>
{{input type="text" value=title }}
<button {{action 'addPost'}} >post</button>
</form>
<br>
{{outlet}}
<br>
<br>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}