Draggable Ember Component

components.drag-box.js

import Ember from 'ember';

export default Ember.Component.extend({
  classNames: ['drag-box'],
  attributeBindings: ['draggable'],
  draggable: true,
  x: 0,
  y: 0,
  positionChanged: Ember.observer('x', 'y', function(){
    this.$().css({
      left: `${this.get('x')}px`,
      top: `${this.get('y')}px`,
    });
  }),
  dragStart(e) {
    var x = parseInt(this.$().css('left')) - e.originalEvent.clientX;
    var y = parseInt(this.$().css('top')) - e.originalEvent.clientY;
    e.originalEvent.dataTransfer.setData("position", `${x},${y}`);
  },
  windowDrop(e) {
    var xy = e.dataTransfer.getData("position").split(',');
    this.setProperties({
      x: `${e.originalEvent.clientX + parseInt(xy[0])}`,
      y: `${e.originalEvent.clientY + parseInt(xy[1])}`,
    });
  },
  windowDragOver(e) {
    e.originalEvent.preventDefault();
  },
  didRender() {
    var self = this;
    $(document)
      .on('drop', $.proxy(self.windowDrop, self))
      .on('dragover', $.proxy(self.windowDragOver, self));
  },
  didDestroyElement() {
    $(document)
      .off('drop')
      .off('dragover');
  }
});

controllers.application.js

import Ember from 'ember';

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

styles.app.css

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

h1 {
  position: absolute;
  height: 1.4rem;
  top: 50%;
  margin-top: -.7rem;
  font-size: 1.4rem;
  line-height: 1.4rem;
  width: 100%;
  text-align: center;
}

.drag-box {
  background-color: black;
  border-radius: 3px;
  cursor: move;
  color: white;
  height: 5rem;
  left: 0;
  position: absolute;
  top: 0;
  width: 5rem;
}

.drag-box p {
  font-size: 1rem;
  line-height: 1rem;
  text-align: center;
  margin: -.5rem 0 0 0;
  position: absolute;
  top: 50%;
  width: 100%;
}

templates.application.hbs

<h1>Drag the box!</h1>
{{drag-box}}

templates.components.drag-box.hbs

<p>{{x}},{{y}}</p>

twiddle.json

{
  "version": "0.8.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.5.1",
    "ember-data": "2.5.2",
    "ember-template-compiler": "2.5.1"
  }
}