callback chain

components.list-item.js

import Ember from 'ember';

export default Ember.Component.extend({
  actions: {
    itemSelected(item) {
      console.log("itemSelected", item);
      this.get("itemCallback")(item);
    }
  }
});

components.the-list.js

import Ember from 'ember';

export default Ember.Component.extend({
  actions: {
    itemSelected(item) {
      console.log("list", item);
      this.get("listCallback")(item);
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  actions: {
    topMostCallback(item) {
      console.log("topMostCallback", item);
    }
  }
});

templates.application.hbs

<p>Below, is a component with a child component</p>
{{the-list listCallback=(action "topMostCallback")}}

templates.components.list-item.hbs

<span {{action "itemSelected" "fooItem"}}>
  List Item (click me)
</span>

templates.components.the-list.hbs

<ul>
  {{list-item itemCallback=(action "itemSelected" "fooItem")}}
</ul>

twiddle.json

{
  "version": "0.7.2",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "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/2.4.4/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.4.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.4.4/ember-template-compiler.js"
  }
}