keyup

components.x-component.js

import Ember from 'ember';

export default Ember.Component.extend({
  attributeBindings: ['tabindex'],
  classNames: ['sortable'],
  tagName: 'div',
});

controllers.application.js

import Ember from 'ember';

const ARROW_UP = 38;
const ARROW_DOWN = 40;
const RETURN = 13;

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  names: ['foo', 'bar', 'baz'],
  
  actions: {
    keyup(idx, item, evt) {
      let names = this.get('names');
      
      if (evt.keyCode === ARROW_UP) {
        if(idx === 0) { return; }
     		let item = names.objectAt(idx);
        names.replace(idx, 1);
        names.replace(idx-1, 0, item);
      } else if (evt.keyCode === ARROW_DOWN) {
        if (idx === names.length -1) { return; }
        let item = names.objectAt(idx);
        names.replace(idx, 1);
        names.replace(idx+1, 0, item);
        Ember.run.scheduleOnce('afterRender', this, 'refocus', idx+1);
      } else if (evt.keyCode === RETURN) {
        console.log('<CR>, time to save our changes');
      }
    }
  },
  
  refocus(idx) {
    let element = Ember.$(`.sortable:nth-of-type(${idx+1})`)[0];
    if(element) {
      element.focus();
    }
    console.log('focus', idx);
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{#each names as |n idx|}}
  {{x-component tabindex=0 name=n keyUp=(action 'keyup' idx n)}}
{{/each}}

<br>
<br>

templates.components.x-component.hbs

- {{name}}
<br>

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"
  }
}