link-to active state

controllers.application.js

import Ember from 'ember';

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

router.js

import Ember from 'ember';
import config from './config/environment';

var Router = Ember.Router.extend({
  location: config.locationType
});

Router.map(function() {
  this.route('thing', { path: 'things/:id' });
});

export default Router;

routes.thing.js

import Ember from 'ember';

export default Ember.Route.extend({
  model: function(params) {
  	return { id: params.id, title: 'Thing '+params.id };
  }
});

styles.app.css

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

.active {
	background: yellow;
}

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>

{{my-component id=1}}
{{my-component id=2}}

{{outlet}}
<br>
<br>

templates.components.my-component.hbs

<code>[my-component]</code><br> {{#link-to 'thing' id}}Thing {{id}}{{/link-to}}

{{yield}}

templates.thing.hbs

<br>
<br>
<code>[ThingRoute]</code>
<br>
<br>

{{#link-to 'index'}}Back{{/link-to}}

<p>{{model.title}}</p>

twiddle.json

{
  "version": "0.4.8",
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.8/ember.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/1.13.9/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/1.13.8/ember-template-compiler.js"
  }
}