Selected Option

components.test-select.js

import Ember from 'ember';

export default Ember.Component.extend({
  
  init() {
    this._super(...arguments);
    this.set('items', 
            
   Ember.A([
    { name: 'Option 1', value: '1', isSelected: false },  
    { name: 'Option 2', value: '2', isSelected: false }, 
    { name: 'Option 3', value: '3', isSelected: true }, 
    { name: 'Option 4', value: '4', isSelected: false }, 
    { name: 'Option 5', value: '5', isSelected: false }, 
  ])
);
  },
  
  actions: {
    itemClicked(selectedValue) {
      var items = this.get('items');
      console.log('selectedValue:' + selectedValue);
      
      items.setEach('isSelected', false);
      debugger;
      items.findBy('value', selectedValue).set('isSelected', true);
    }
  }
});

controllers.application.js

import Ember from 'ember';

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

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
{{test-select}}
<br>
<br>

templates.components.test-select.hbs

<h3>selected example:</h3>
<select onchange={{action 'itemClicked' value='target.value'}}>
    <option selected disabled value="">Placeholder</option>

    {{#each items as |item|}}
    	<option value={{item.value}} selected={{if item.isSelected "selected"}}>{{item.name}}</option>
    {{/each}}
</select>

<h3>data-selected example:</h3>
<select onchange={{action 'itemClicked' value='target.value'}}>
    <option selected disabled value="">Placeholder</option>

    {{#each items as |item|}}
    	<option value={{item.value}} data-selected={{if item.isSelected "selected"}}>{{item.name}}</option>
    {{/each}}
</select>

twiddle.json

{
  "version": "0.13.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3"
  }
}