Simple Dropdown

components.my-dropdown.js

import Ember from 'ember';

export default Ember.Component.extend({
  "on-select": 						"someAction",
  emptyText:	 					"Please select an option",
  options: 							null,
  selected: 						null,
  showOptionsContainer: false,
  
  wrappedOptions: Ember.computed('options.[]','selected', function() {
    var _this = this;
    return Ember.A(this.get('options').map(function(item){
      return Ember.Object.create({
        value: item,
        selected: item === _this.get('selected')
      });
    }));
  }),
  
  actions: {
    toggleOptionsContainer: function() {
      this.toggleProperty('showOptionsContainer');
    },
    select: function(option) {
      this.sendAction("on-select", option);
    }
  }
    
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  dropdownOptions: ["Kyle","Tarun"],
  dropdownSelected: null,
  
  actions: {
    selectOption: function(option) {
      console.log("seeting value to", option);
      this.set('dropdownSelected', option);
    }
  }
});

styles.app.css

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

.dropdown {
  border: #eee 1px solid;
  padding: 5px 10px;
}

.optionsContainer {
    border: #eee 1px solid;
}

.optionsContainer > div {
  padding: 5px;
  border-bottom: #eee 1px solid;
}

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{#my-dropdown on-select="selectOption" selected=dropdownSelected emptyText="Select an option" options=dropdownOptions}}
{{/my-dropdown}}
{{outlet}}
<br>
<br>

templates.components.my-dropdown.hbs

<div class="dropdown" {{action "toggleOptionsContainer"}}>{{if selected selected emptyText}}</div>
{{#if showOptionsContainer}}
<div class="optionsContainer">
	{{#each wrappedOptions as |option|}}
  	<div {{action "select" option.value}}>{{if option.selected "(Active)"}}{{option.value}}</div>
  {{/each}}
</div>
{{/if}}

tests.helpers.destroy-app.js

import Ember from 'ember';

export default function destroyApp(application) {
  Ember.run(application, 'destroy');
}

tests.helpers.resolver.js

import Resolver from '../../resolver';
import config from '../../config/environment';

const resolver = Resolver.create();

resolver.namespace = {
  modulePrefix: config.modulePrefix,
  podModulePrefix: config.podModulePrefix
};

export default resolver;

tests.helpers.start-app.js

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

const { run } = Ember;
const assign = Ember.assign || Ember.merge;

export default function startApp(attrs) {
  let application;

  let attributes = assign({rootElement: "#test-root"}, config.APP);
  attributes = assign(attributes, attrs); // use defaults, but you can override;

  run(() => {
    application = Application.create(attributes);
    application.setupForTesting();
    application.injectTestHelpers();
  });

  return application;
}

tests.test-helper.js

import resolver from './helpers/resolver';
import {
  setResolver
} from 'ember-qunit';

setResolver(resolver);

twiddle.json

{
  "version": "0.11.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.11.0",
    "ember-data": "2.11.0",
    "ember-template-compiler": "2.11.0",
    "ember-testing": "2.11.0"
  },
  "addons": {}
}