component communication

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  messages: [
    {
      text: 'message 1'
    },
    {
      text: 'message 2'
    },
    {
      text: 'message 3'
    },
    {
      text: 'message 4'
    },
    {
      text: 'message 5'
    },
    {
      text: 'message 6'
    },
    {
      text: 'message 7'
    }
  ],
  createMessage(m) {
    this.get('messages').pushObject({text: m});
  },
  removeMessage(m) {
    this.get('messages').removeObject(m);
  }
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{message-list messages=messages removeMessage=(action removeMessage)}}
{{message-composer createMessage=(action createMessage)}}
<br>
<br>

message-composer.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  actions: {
    createMessage() {
      let text = this.get('text') || '';
      this.set('text', '');
      this.get('createMessage')(text);
    }
  }
});

message-composer.template.hbs

{{input value=text}}
<button onclick={{action "createMessage"}}>Create message</button>

message-list.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  tagName: 'ul',
  actions: {
    removeMessage(m) {
      this.get('removeMessage')(m);
    }
  }
});

message-list.template.hbs

{{#each messages as |m|}}
  <li>{{m.text}} <button onclick={{action "removeMessage" m}}>X</button></li>
{{/each}}

twiddle.json

{
  "version": "0.4.17",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}