Attribute Bindings

components.pretty-color.js

import Ember from 'ember';

export default Ember.Component.extend({
  attributeBindings: ['style',],
  // The classNameBindings values are a ternary operator!
  classNameBindings: ['isBlue:blue:not-blue'], 
  isBlue: false,

  style: Ember.computed('name', function() {
    const color = this.get('color');
    return `color: ${color}`;
  }),
  
  didInsertElement() {
  	this.send('checkColor');
  },
  
  didUpdateAttrs() {
  	this.send('checkColor');
  },
  
  actions: {
		checkColor() {
			if (this.get('color') === 'blue') {
        this.set('isBlue', true);
      }
		}
	}
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  colorValue: 'blue'  // blue by default
});

styles.app.css

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{pretty-color color=colorValue}}
{{outlet}}
<br>
<br>

templates.components.pretty-color.hbs

<h3>Change the color in the controller.  Then check the source to see the class names.</h3>


Pretty Color: {{color}}

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"
  }
}