DDAU

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'DDAU',
  
  actions:{
		appLevelAction: function(value) {
			alert("Application action: " + value);
		}
	}
  
});

application.template.hbs

<div style="border: 1px solid black">
  <h1>Application template</h1>
  <br>
  {{my-post postAction="appLevelAction"}}
  <br>
</div>

my-comment.component.js

import Ember from 'ember';

export default Ember.Component.extend({

  actions: {
  	commentLevelAction: function(value) {
      alert("comment action: " + value);
      this.sendAction("commentAction", value);
		}
  }
});

my-comment.template.hbs

<div style="border: 1px solid black">
  <h1>Comment template</h1>
  {{input value=myValue}}<br>
	<button {{action "commentLevelAction" myValue}}>Click me!</button>

</div>

my-post.component.js

import Ember from 'ember';

export default Ember.Component.extend({

  actions: {
    postlevelAction: function(value) {
      alert("post action: " + value);
      this.sendAction("postAction", value)
    }	    
  }
});

my-post.template.hbs

<div style="border: 1px solid black">
  <h1>Post template</h1>
	{{my-comment commentAction="postlevelAction"}}
  <br>
</div>

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}

twiddle.json

{
  "version": "0.5.3",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.3.1/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.3.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js",
    "fontawesome": "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css"
  }
}