Configurable actions

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  
  foo: 123,
  
  'on-click'(selected) {
    this.set('foo', selected);
  },

  actions: {
    didClick() {
      let selected = 'bar';
      
      this.get('on-click').call(this, selected);
    }
  }
  
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({

  actions: {
    updateFoo(val) {
      this.set('foo', val);
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{my-component}}
{{my-component on-click=(action 'updateFoo')}}

{{foo}}

templates.components.my-component.hbs

<p>
  <a {{action 'didClick'}} href='#'>
    Click me
  </a>
</p>
<p>
  The value of foo is {{foo}}.
</p>

twiddle.json

{
  "version": "0.10.6",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.9.0",
    "ember-data": "2.9.0",
    "ember-template-compiler": "2.9.0",
    "ember-testing": "2.9.0"
  },
  "addons": {}
}