New Twiddle

components.child-component.js

import Ember from 'ember';
import UpdateMixin from '../mixins/update';

export default Ember.Component.extend({
  
  child_val: '',

  actions:{
    
		childAction(){
			alert( 'childAction called..' );
      
      // some validation and ajax call.
      
      self.set( 'updated_val', self.get( 'child_val' ) );
      
     }
  
  }
  
});

components.dialog-component.js

import Ember from 'ember';

/*********** need to import dynamic mixin here ********/

export default Ember.Component.extend({
 
  //	updateValue action called from it's hbs file
  
});

controllers.application.js

import Ember from 'ember';
import UpdateMixin from '../mixins/update';

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

mixins.update.js

import Ember from 'ember';

export default Ember.Mixin.create({

  updated_val: 'Empty',
  
  actions:{
    updateValue(){
      var self = this;
      alert(self.get('updated_val'));
    }
  }

}); 

styles.app.css

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

.dialog{
	border: solid 1px;
  width: 300px;
  height: 100px;
}

templates.application.hbs

<h1>Trigger action between Parent-to-Child Component</h1>
<br>
<br>
{{outlet}}
<br>
<br>

{{dialog-component}}

<br>

Value Update from child-component: {{ updated_val }}

templates.components.child-component.hbs

{{input value=child_val }} 

templates.components.dialog-component.hbs

<div class='dialog'>
	
  {{ child-component child_val=updated_val}}

  <button {{action 'updateValue'  }}> Update </button>
  
</div>

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"
  }
}