Actions

components.child-item.js

import Ember from 'ember';

export default Ember.Component.extend({
  
  actions: {
    speak() {
      this.sendAction('hello', 'Barney');
    }
  }
});

components.middle-item.js

import Ember from 'ember';

export default Ember.Component.extend({
});

components.parent-item.js

import Ember from 'ember';

export default Ember.Component.extend({
  
  actions: {
    hello (name) {
      alert('Hello ' + name);
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{parent-item}}
{{outlet}}
<br>
<br>

templates.components.child-item.hbs

Child
<br>
<button {{action "speak"}}>Say hello to Barney</button>
<br>
<button {{action hello "Fred"}}>Say hello to Fred</button>
<br>
<button onclick={{action hello "Rupert"}}>Say hello to Rupert</button>

templates.components.middle-item.hbs

Middle

{{child-item
  hello=hello}}

templates.components.parent-item.hbs

Parent

{{middle-item 
  hello=(action "hello")}}

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"
  }
}