StackOverFlow-33611012

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  countries: [
     {code:"IN", name: "India"},
     {code: "US", name: "USA"},
     {code: "UK", name: "UK"}
   ],
   selectedCode: "US",
   errors: {
     name: "Validation messge"
   },
   actions: {
     selectionchange(code) {
       this.set('selectedCode', code);
     }
   }

});

application.route.js

import Ember from 'ember';
var Countries = [
   {
       "name": "Afghanistan",
       "code": "AF"
   },
   {
       "name": "Åland Islands",
       "code": "AX"
   },
   {
       "name": "Albania",
       "code": "AL"
   },
   {
       "name": "Algeria",
       "code": "DZ"
   }];
export default Ember.Route.extend({
  model: function () {
  	return Ember.RSVP.hash({
    	countries: Countries
  })
  }
})

application.template.hbs

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

Selected Country Code is: {{selectedCode}}


<select class="left-float" onchange={{action "selectionchange" value="target.value" bubbles=true}} >
  {{#each countries as |country|}}
   <option value="{{country.code}}"  selected={{eq selectedCode country.code}}>{{country.name}}</option>
 {{/each}}
</select>


<br>
<br>

helpers.eq.js

import Ember from 'ember';

export function eq(params) {
  return params[0] === params[1];
}

export default Ember.Helper.helper(eq);

twiddle.json

{
  "version": "0.4.16",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.1.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember-template-compiler.js"
  }
}