stackoverflow question#43090234

components.my-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  isBlankSelected: Ember.computed.empty('selectedOption'),
  
  actions: {
    loadFilter(selectedOption) {
      this.set('selectedOption', selectedOption);
    }
  }
});

controllers.application.js

import Ember from 'ember';

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

routes.index.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    return [
      {id:1, description: "Item1"},
      {id:2, description: "Item2"},
      {id:3, description: "Item3"},
      {id:4, description: "Item4"},
      {id:5, description: "Item5"},
      {id:6, description: "Item6"}
      ];
  }
});

templates.application.hbs

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

templates.components.my-component.hbs

<select name="newType" class="parts-select full-width-combo" onchange={{action "loadFilter" value="target.value" }}>
            <option value="" selected={{isBlankSelected}}  hidden >Select </option>
            {{#each model as |item|}}
                <option value="{{item.id}}" selected={{eq selectedOption item.id}}>{{item.description}}</option>
            {{/each}}
 </select>
 
 <br><br>
 Push button below to select item 4 dynamically!<br>
 <button onclick={{action 'loadFilter' 4}}>Select Item with id 4</button>
<br><br>
  Push button below to nullify selection!<br>
 <button onclick={{action 'loadFilter' null}}>Nullify selection</button>

templates.index.hbs

{{my-component model=model}}

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-truth-helpers": "1.3.0"
  }
}