http://stackoverflow.com/questions/39529258/ember-1-1x-key-press-event-not-responding-to-backspace/39531654

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  actions:{
    keyUpFromApp(value,event){
      console.log('keyup-event in component ',value, ' event ',event);
      return true;
    }
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  actions:{
    keyUpFromApp(value,event){
      console.log('keyup-event ',value, ' event ',event);
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
{{input value="kumkan" key-up="keyUpFromApp"}}
{{my-component }}
<br>
{{outlet}}
<br>
<br>

templates.components.my-component.hbs

{{input value="kumkan" key-up="keyUpFromApp"}}
{{yield}}

twiddle.json

{
  "version": "0.10.5",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "1.12.2",
    "ember-data": "2.8.0",
    "ember-template-compiler": "1.12.2",
    "ember-testing": "1.12.2"
  },
  "addons": {}
}