stackoverflow question #43226566

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  items: [{title:'title 1'},{title:'title 2'},{title:'title 3'}],
  
  computedProperty: Ember.computed('[email protected]', function(){
    console.log('@computed is triggered due to change of title of one of the items');
    
    return 'computed property is needed to be consumed in order to get triggered';
  }),
  
  actions: {
    decreaseTitle() {
    }
  }
  
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{#each items as |item|}}
        <div class="form-group">
          <label class="col-sm-3 control-label">Judul {{item.no}}</label>
          <div class="col-sm-9 input-group">
            {{input class="form-control" value=item.title placeholder="Tambah judul" type="text"}}
            <span class="input-group-btn">
              <a class="btn btn-default remove_detail" type="button" onclick={{action 'decreaseTitle'}}><i class="fa fa-times"></i></a>
            </span>
          </div>
        </div>
{{/each}}

{{computedProperty}}
<br>
<br>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}