Demo -Parent-Child-Component-interaction

components.child-a.js

import Ember from 'ember';

export default Ember.Component.extend({
  didInsertElement(){
    this._super(...arguments);
    console.log('didInsertElement in child-a');
  },
  didRender(){
    this._super(...arguments);
    console.log('didRender in child-a');
  },
  actions:{
    changeAppName(){
      console.log('changeAppName in child-a');
      console.log(' child-a '+this.get('appName'));
      this.sendAction('changeAppName');
    }
  }
});

components.parent-letters.js

import Ember from 'ember';

export default Ember.Component.extend({
  didInsertElement(){
    this._super(...arguments);
    console.log('didInsertElement in parent-letters');
  },
  didRender(){
    this._super(...arguments);
    console.log('didRender in parent-letters');
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  actions:{
    changeAppName(){
      console.log('changeAppName in controller ');
      this.set('appName','Kumkan PlayGround');
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{parent-letters appName=appName changeAppName=(action 'changeAppName')}}
<br>
{{outlet}}
<br>
<br>

templates.components.child-a.hbs

<h3>Child</h3>
{{appName}}
<button {{action (action 'changeAppName') }}>ChangeAppName-Chid</button>
{{yield}}

templates.components.parent-letters.hbs

<h2>Parent</h2>
{{appName}}
{{child-a appName=appName changeAppName=changeAppName}}
<button {{action (action changeAppName) }}>ChangeAppName</button>
{{yield}}

twiddle.json

{
  "version": "0.10.4",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.7.0",
    "ember-data": "2.7.0",
    "ember-template-compiler": "2.7.0"
  },
  "addons": {}
}