New Twiddle

components.some-filter.js

import Ember from 'ember';

export default Ember.Component.extend({
  class: 'some-filter',
  classNameBindings: ['selected'],
  
  selected: Ember.computed('selectedFilter', function () {
    const label = this.get('label')
    const selectedFilter = this.get('selectedFilter')
    return label === selectedFilter
  }),
  
  click () {
    this.onSelect(this.get('label'))
  }
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  controllerSelectedFilter: 'B',
  
  content: Ember.computed('controllerSelectedFilter', function () {
    switch (this.get('controllerSelectedFilter')) {
      case 'A': return 'is for Apple'
      case 'B': return 'is for Banana'
      case 'C': return 'is for Carrot'
    }
  }),
  
  actions: {
    select (label) {
      this.set('controllerSelectedFilter', label)
    }
  }
});

routes.my-other-route.js

import Ember from 'ember';

export default Ember.Route.extend({
});

routes.my-route.js

import Ember from 'ember';

export default Ember.Route.extend({
});

routes.my-super-route.js

import Ember from 'ember';

export default Ember.Route.extend({
});

styles.app.css

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

.selected {
  border-bottom: 2px solid green;
}

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
<div>
<span>
{{some-filter label='A' selectedFilter=controllerSelectedFilter onSelect=(action 'select')}}
{{some-filter label='B' selectedFilter=controllerSelectedFilter onSelect=(action 'select')}}
{{some-filter label='C' selectedFilter=controllerSelectedFilter onSelect=(action 'select')}}
</span>
<span>
	{{content}}
</span>
</div>
<br>
<br>

templates.components.some-filter.hbs

{{label}}

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"
  }
}