Index Selection

controllers.application.js

import Ember from 'ember';

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

controllers.index.js

export default Ember.Controller.extend({
  selectedIndex : false,

  actions : {
    selected(idx){
      this.set('selectedIndex', idx);
    }
  }
});

helpers.is-equal.js

import Ember from 'ember';

export function isEqual([a, b]) {
  return a === b;
}

export default Ember.Helper.helper(isEqual);

routes.index.js

import Ember from 'ember';

export default Ember.Route.extend({
  
  model(){
  	return ["Mango","Orange","Apple"]
  }
});

styles.app.css

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

.highlight{
	border:1px solid red;
}

templates.application.hbs

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

templates.index.hbs

<h2>This is from Index page</h2>
<ul>
{{#each model as |fruit i|}}
    <li {{action "selected" i}} class="{{if (is-equal i selectedIndex) 'highlight' ''}}" >{{fruit}}</li>
{{/each}}
</ul>

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"
  }
}