List Test

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  items: "one two three".w(),
  actions: {
    handleSelect(item) {
      alert(item);
    }
  }
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{#list-view items=items onSelect=(action 'handleSelect') as |item selected onSelect|}}
  {{! use a component }}
  {{list-item value=item isSelected=selected onSelect=onSelect}}

  {{! or your own markup }}
  {{!--
  <b {{action onSelect}}>{{item}} {{if selected 'is grate'}}</b>
  --}}
{{/list-view}}

<br>
<br>

helpers.eq.js

import Ember from 'ember';

export function eq(params/*, hash*/) {
  return params[0] === params[1];
}

export default Ember.Helper.helper(eq);

list-item.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  tagName: 'li',
  classNameBindings: ['isSelected'],
  click() {
    let onSelect = this.get('onSelect');
    if (typeof onSelect === 'function') {
      onSelect();
    }
  }
});

list-item.template.hbs

{{value}}

list-view.component.js

import Ember from 'ember';

export default Ember.Component.extend({
  selectedItem: null,
  actions: {
    onSelect(item) {
      let onSelect = this.get('onSelect');
      this.set('selectedItem', item);
      typeof onSelect === 'function' && onSelect(item);
    }
  }
});

list-view.template.hbs

{{#each items as |item|}}
  {{yield item (eq item selectedItem) (action 'onSelect' item)}}
{{/each}}

styles.app.css

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

li {
  cursor: default;
}

.is-selected {
  color: hotpink;
}

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"
  }
}