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              <link href='https://fonts.googleapis.com/css?family=Asap:400,700' rel='stylesheet' type='text/css'>
<link href='https://fonts.googleapis.com/css?family=Signika+Negative:300,400,700' rel='stylesheet' type='text/css'>
<h1>Draggable autoScroll</h1>
<p>As of version 0.12.0, Draggable has auto-scrolling capabilities! Add <code>autoScroll:1</code> to the config object for normal-speed scrolling, or <code>autoScroll:2</code> would be twice as fast, etc. When your mouse moves within 40px of the edge of a scrollable container, it will start scrolling. The closer you get to the edge, the faster it will scroll. Try it out below...</p>
<div class="wrapper">
<div id="container">
		<div class="box" id="box1">Drag me</div>
<div class="controls">
					<li class="controlsTitle">Options</li>
						<label><input type="checkbox" name="snap" id="snap" value="1" /> Snap end position to grid</label>
						<label><input type="checkbox" name="liveSnap" id="liveSnap" value="1" /> Live snap</label>
              body {
  font-family: Signika Negative, Asap, sans-serif;
  color: #ccc;

h1 {
  font-weight: 400;
  color: white;

p {
  font-size: 18px;
  font-weight: 300;

.wrapper {

#container {

.box {
	background-color: #91e600;
	text-align: center;
	font-family: Signika Negative, Avenir, Arial, sans-serif;
  font-size: 18px;
	width: 196px;
	height: 100px;
	line-height: 100px;
	color: black;
	position: absolute;
	-webkit-border-radius: 10px;
	-moz-border-radius: 10px;
	border-radius: 10px;

.controls {
	background-color: #222;
	border: 1px solid #555;
	color: #bbb;
	font-size: 18px;
  margin: 20px 0;
.controls ul {
	list-style: none;
	padding: 0;
	margin: 0;
.controls li {
	display: inline-block;
	padding: 8px 0 8px 10px;
.controls input {
  cursor: pointer;
.controls .controlsTitle {
  border-right:1px solid #555; 
See https://greensock.com/gsap-1-16 for details. 
This demo uses ThrowPropsPlugin which is a membership benefit of Club GreenSock, https://greensock.com/club/
var $snap = $("#snap"),
  $liveSnap = $("#liveSnap"),
	$container = $("#container"),
	gridWidth = 74,
	gridHeight = 50,
	gridRows = 28,
	gridColumns = 40,
	i, x, y;

//loop through and create the grid (a div for each cell). Feel free to tweak the variables above
for (i = 0; i < gridRows * gridColumns; i++) {
	y = Math.floor(i / gridColumns) * gridHeight;
	x = (i * gridWidth) % (gridColumns * gridWidth);
	$("<div/>").css({position:"absolute", border:"1px solid #454545", width:gridWidth-1, height:gridHeight-1, top:y, left:x}).prependTo($container);

//set the container's size to match the grid, and ensure that the box widths/heights reflect the variables above
TweenLite.set($container, {height: gridRows * gridHeight + 1, width: gridColumns * gridWidth + 1});
TweenLite.set(".box", {width:150, height:100, lineHeight:"100px"});

//the update() function is what creates the Draggable according to the options selected (snapping).
function update() {
  var snap = $snap.prop("checked"),
      liveSnap = $liveSnap.prop("checked");
	Draggable.create(".box", {
    //if the element gets thrown outside the wrapper, scroll accordingly to center it. 
    onRelease: function() {
      this.tween.progress(1); //put the element at the END of where it's thrown so we can calculate bounds accordingly
      var wrapper = document.querySelector(".wrapper"),
          tBounds = this.target.getBoundingClientRect(),
          wBounds = wrapper.getBoundingClientRect(),
          wCenter = wBounds.left + (wBounds.width / 2),
          tCenter = tBounds.left + (tBounds.width / 2),
          scroll = {};
      if (tBounds.right > wBounds.right || tBounds.left < wBounds.left) {
        scroll.x = wrapper.scrollLeft + (tCenter - wCenter);
      if (tBounds.bottom > wBounds.bottom || tBounds.top < wBounds.top) {
        wCenter = wBounds.top + (wBounds.height / 2);
        tCenter = tBounds.top + (tBounds.height / 2);
        scroll.y = wrapper.scrollTop + (tCenter - wCenter);
      TweenMax.to(wrapper, this.tween.duration(), {scrollTo:scroll});
      this.tween.progress(0); //now return the element to where it was thrown from.
			x: function(endValue) {
				return (snap || liveSnap) ? Math.round(endValue / gridWidth) * gridWidth : endValue;
			y: function(endValue) {
				return (snap || liveSnap) ? Math.round(endValue / gridHeight) * gridHeight : endValue;

//when the user toggles one of the "snap" modes, make the necessary updates...
$snap.on("change", applySnap);
$liveSnap.on("change", applySnap);

function applySnap() {
	if ($snap.prop("checked") || $liveSnap.prop("checked")) {
		$(".box").each(function(index, element) {
			TweenLite.to(element, 0.5, {
				x:Math.round(element._gsTransform.x / gridWidth) * gridWidth,
				y:Math.round(element._gsTransform.y / gridHeight) * gridHeight,

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