New Twiddle

components.form-field.js

import Ember from 'ember';

export default Ember.Component.extend({
  emailChanged: Ember.observer('email', function() {
    console.log('changed');
    if (/\s/g.test(this.get('email'))) {
      Ember.run.once(this, 'formatEmail');
    }
  }),

  formatEmail() {
    this.set('email', this.get('email').replace(/\s/g, ''));
  },
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
<br>
{{form-field}}

templates.components.form-field.hbs

  <div class='input-field'>
    {{input id='email' value=email}}
    <label for='email' class={{if email 'active'}}>Email</label>
  </div>

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"
  }
}