Component Blur Demo

application.controller.js

import Ember from 'ember';

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

application.template.hbs

<h1>Component Blur Demo</h1>
<br>
<br>
<h2>my-component</h2>
{{my-component}}
<br>
<br>
<h2>other-component</h2>
<p>(also works)</p>
{{other-component}}
<br>
<br>

components.other-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  classNames: ['focus-box'],
  attributeBindings: ['tabindex'],
  'tabindex': 1000,
  
  hasFocus: false,
  
  focusIn() {
    this.set('hasFocus', true);
  },
  
  focusOut() {
	  this.set('hasFocus', false);
  }
  
});

my-component.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  classNames: ['focus-box'],
  attributeBindings: ['tabindex'],
  'tabindex': 1000,
  
  hasFocus: false,
  
  _focuslistener: null,
  _blurlistener: null,
  didInsertElement() {
    this._super();
    this._blurlistener = () => {
      this.set('hasFocus', false);
    };
    this._focuslistener = () => {
      this.set('hasFocus', true);
    };
    this.element.addEventListener('blur', this._blurlistener, true);
    this.element.addEventListener('focus', this._focuslistener, true);
  },
  
  willDestroyElement() {
    this._super();
    this.element.removeEventListener('blur', this._blurlistener, true);
    this.element.removeEventListener('focus', this._focuslistener, true);
    this._focuslistener = null;
    this._blurlistener = null;
  }
});

my-component.template.hbs

<p>
  This component box is {{if hasFocus 'focused' 'blurred'}}.
</p>
<p>
  Click anywhere outside it's box to blur it.
</p>

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
  background: #444;
  color: #f0bf50;
}

.focus-box {
  padding: 1em;
  border: 1px solid #bbb;
  background: #666;
}

.focus-box:focus {
 outline: none; 
}

templates.components.other-component.hbs

<p>
  This component box is {{if hasFocus 'focused' 'blurred'}}.
</p>
<p>
  Click anywhere outside it's box to blur it.
</p>

twiddle.json

{
  "version": "0.6.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "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/2.3.1/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.3.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}