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---
title: jQuery.event.move
---
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="author" content="">
<meta name="description" content="">
<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.5">
<title>jQuery.event.move</title>
<script>document.documentElement.className = 'js';</script>
<link rel="icon" type="image/png" href="images/favicon.png" />
<link rel="apple-touch-icon" href="/apple-touch-icon.png">
<link rel="stylesheet" type="text/css" href="http://stephen.band/bolt/package/css/bolt-0.9.8.css" />
<link rel="stylesheet" type="text/css" href="http://stephband.info/css/template.min.css" />
<link rel="stylesheet" type="text/css" href="http://stephband.info/css/template.theme.min.css" />
<link rel="stylesheet" type="text/css" href="http://stephband.github.com/css/site.layout.css" />
<link rel="stylesheet" type="text/css" href="http://stephband.github.com/css/docs.classes.css" />
<link rel="stylesheet" type="text/css" href="http://stephband.github.com/css/site.highlight.light.css" />
<link rel="stylesheet" type="text/css" href="css/demo.css" />
</head>
<body>
<header class="site_header" id="page_header">
<div class="site_wrap wrap">
<a class="logo_thumb thumb" href="http://stephband.info" title="stephband" rel="index">
<h1>stephband.info</h1>
</a>
</div>
</header>
<div class="site_wrap wrap">
<h1>jQuery.event.move</h1>
<div class="test_wrap wrap">
<div class="test">
<div class="resize"></div>
<div class="rotate"></div>
</div>
<div class="centre_mark"></div>
<div class="origin_mark"></div>
</div>
<h2>Project</h2>
<ul>
<li>Github: <a href="http://github.com/stephband/jquery.event.move">github.com/stephband/jquery.event.move</a></li>
<li>Issues: <a href="http://github.com/stephband/jquery.event.move/issues">github.com/stephband/jquery.event.move/issues</a></li>
</ul>
<p>*UPDATE 2.0.0*: `move` events are now compatible with jQuery 3.x. In addition, the
underlying implementation is rewritten using vanilla DOM (where before it
was jQuery special events only) – jQuery is no longer a requirement.</p>
<h2 id="what">Move events</h2>
<dl>
<dt>movestart</dt>
<dd>Fired following touchmove or mousemove, when the touch (or mouse) crosses a threshold distance from the position of the mousedown or touchstart.</dd>
<dt>move</dt>
<dd>Fired on every animation frame where a touchmove or mousemove has changed position.</dd>
<dt>moveend</dt>
<dd>Fired following mouseup or touchend, after the last move event, and in the case of touch events when the finger that started the move has been lifted.</dd>
</dl>
<p>Move event objects are augmented with the properties:</p>
<dl>
<dt>e.pageX, e.pageY</dt>
<dd>Current page coordinates of pointer.</dd>
<dt>e.startX, e.startY</dt>
<dd>Page coordinates the pointer had at movestart.</dd>
<dt>e.distX, e.distY</dt>
<dd>Distance the pointer has moved since movestart.</dd>
<dt>e.deltaX, e.deltaY</dt>
<dd>Distance the pointer has moved since last move event.</dd>
<dt>e.velocityX, e.velocityY</dt>
<dd>Velocity in pixels/ms, averaged over the last few events.</dd>
</dl>
<h2 id="how">How to use move events</h2>
<div class="grid-block block">
<div class="grid-1/2 block">
<h3 class="text-4">Native DOM</h3>
{% highlight js %}
var node = document.querySelector('.mydiv');
// A movestart event must be bound
// and explicitly enabled
node.addEventListener('movestart', function(e) {
e.enableMove();
});
node.addEventListener('move', function(e) {
// move .mydiv horizontally
this.style.left = (e.startX + e.distX) + 'px';
})
node.addEventListener('moveend', function() {
// move is complete!
});{% endhighlight %}
<p><code>.enableMove()</code> is a necessary performance optimisation
(that works around the DOM's lack of event inspection).</p>
</div
><div class="grid-1/2 block">
<h3 class="text-4">jQuery</h3>
{% highlight js %}
jQuery('.mydiv')
.on('move', function(e) {
// move .mydiv horizontally
jQuery(this).css({ left: e.startX + e.distX });
})
.on('moveend', function() {
// move is complete!
});{% endhighlight %}
<p>(jQuery's special event system does the work of enabling
move events so there is no need to explicitly bind to
<code>movestart</code>.)</p>
</div>
</div>
<h2 id="why1">Why not just use mouse or touch events?</h2>
<p>Well, yes, you can. But move events abstract away the details that need attention when writing this kind of interaction model with mouse and touch events:</p>
<ul>
<li>Supports mouse and touch devices, exposing the same event API for both</li>
<li>Throttles moves to animation frames, preventing unneccesary calls</li>
<li>Ignores the right mouse button and clicks with modifier keys</li>
<li>Prevents text selection while moving</li>
<!--li>Prevents scrolling of touch interfaces while moving</li-->
<li>Handles multiple touches</li>
<li>Deals with bug (Chrome, possibly all Android) where changedTouches includes touches that have not changed</li>
<li>Handles browser differences where touches in iOS are live objects, where in Android they are static</li>
<li>Does not bork interaction with form inputs inside moveable nodes</li>
<li>Suppresses drag and drop events</li>
</ul>
<p>Move events are intended as 'building blocks' for helping to build interactions.
They track individual fingers or a single mouse, and expose properties on their event objects that are useful for detecting gestures.</p>
<h2 id="why2">What about drag events?</h2>
<p>Move events are designed to compliment drag events, where the two have different meanings: drag events are for transferring data while move events are for making interactive interfaces.
That said, <code>movestart</code>, <code>move</code> and <code>moveend</code> events deliberately echo <code>dragstart</code>, <code>drag</code> and <code>dragend</code> events, with one main difference:
where the <code>drag</code> event fires continuously whether you have moved the pointer or not, the <code>move</code> event fires only after the pointer has been moved, and only on animation frames.</p>
<p>Where both a <code>dragstart</code> and any move event are bound to the same node, drag events are suppressed.</p>
<!--h2 id="where">Where is jquery.event.move being used?</h2>
<p>It's part of my front-end toolkit, <a href="http://stephband.info/bolt">Bolt</a>. It's also used for:</p>
<ul>
<li><a href="http://www.webdoc.com">webdoc.com</a></li>
<li><a href="http://stephband.info/jquery.event.swipe">jquery.event.swipe</a></li>
</ul>
<p>Do let me know at <a href="http://twitter.com/stephband">@stephband</a> if you use it in your project. Cheers!</p-->
</div>
<footer class="site_footer">
<div class="full_wrap wrap">
<div class="bio_col col">
<h3>Who made this?</h3>
<p>I did. I come from Scotland and I live in Lausanne, Switzerland. I make web things at <a href="http://cruncher.ch">Cruncher</a>. I miss Branston Pickle. When I'm not glued to a screen I play music and hike mountains.</p>
</div
><div class="repo_col col">
<h3>More code</h3>
<ul class="repo_index index">
<li><a href="http://stephband.info/bolt">Bolt</a></li>
<li><a href="http://stephband.info/jparallax/">jQuery.parallax</a></li>
<li><a href="http://stephband.info/jquery.event.tap/">jQuery.event.tap</a></li>
<li><a href="http://stephband.info/jquery.event.move/">jQuery.event.move</a></li>
<li><a href="http://stephband.info/jquery.event.swipe/">jQuery.event.swipe</a></li>
</ul>
</div
><div class="social_col col">
<h3>Find me on...</h3>
<ul class="social_index index">
<li><a href="http://twitter.com/stephband">twitter</a></li>
<li><a href="http://github.com/stephband">github</a></li>
<li><a href="http://plus.google.com/114566808430966059989/photos">google+</a></li>
<li><a href="http://www.linkedin.com/profile/view?id=27013870">linkedin</a></li>
</ul>
</div>
</div>
</footer>
<script src="js/jquery-3.1.1.js"></script>
<script src="js/jquery.event.move.js"></script>
<script>
function toDeg(n) { return n * 57.295779513; }
function toRad(n) { return n / 57.295779513; }
// FUNCTIONS
var pi = Math.PI,
pi2 = pi * 2;
// Converts cartesian [x, y] to polar [distance, angle] coordinates,
// downward, anti-clockwise, angle in radians.
function toPolar(cart) {
var x = cart[0],
y = cart[1];
// Detect quadrant and work out vector
if (y === 0) { return x === 0 ? [0, 0] : x > 0 ? [x, 0.5 * pi] : [-x, 1.5 * pi] ; }
if (y < 0) { return x === 0 ? [-y, pi] : [Math.sqrt(x*x + y*y), Math.atan(x/y) + pi] ; }
if (y > 0) { return x === 0 ? [y, 0] : [Math.sqrt(x*x + y*y), (x > 0) ? Math.atan(x/y) : pi2 + Math.atan(x/y)] ; }
}
// Converts [distance, angle] vector to cartesian [x, y] coordinates.
function toCartesian(vect) {
var d = vect[0],
a = vect[1];
// Work out cartesian coordinates
return [ Math.sin(a) * d, Math.cos(a) * d ];
}
// log event objects
function logEvent(e){ window.console && console.log(e.type, e); }
jQuery(document)
//.bind('mousedown mouseup', logEvent)
.ready(function(){
var start;
var box = jQuery('.test');
var resize = jQuery('.resize');
var rotate = jQuery('.rotate');
var centreMark = jQuery('.centre_mark');
var originMark = jQuery('.origin_mark');
// Test setup and teardown with multiple binds and unbinds...
box
//.on('movestart move moveend', logEvent)
//.off('movestart')
//.off('move')
//.off('moveend')
//.bind('movestart move moveend', logEvent)
.on('movestart', function(e){
// Only listen to one finger
if (e.targetTouches && e.targetTouches.length > 1) {
e.preventDefault();
return;
}
if (e.target == e.currentTarget) {
start = {
x: parseInt(box.css('left')),
y: parseInt(box.css('top'))
};
}
})
.on('move', function(e){
if (e.target == e.currentTarget) {
// Test object
box.css({
left: start.x + e.distX,
top: start.y + e.distY
});
// Guides
originMark.css({
left: start.x + e.distX,
top: start.y + e.distY
});
centreMark.css({
left: start.x + e.distX + box.width()/2,
top: start.y + e.distY + box.height()/2
});
}
});
var rotation = 0;
(function(){
var start, rotatedOrigin, distX, distY;
resize
.on('movestart', function(e){
var polarOrigin;
start = {
left: parseInt(box.css('left')),
top: parseInt(box.css('top')),
width: box.width(),
height: box.height()
};
})
.on('move', function(e){
var polarDelta = toPolar([e.distX, e.distY]),
normalisedDelta, originDelta, width, height;
// Comments are useless. I can't describe what's going
// on here without a pencil and paper. Sorry, but basically,
// we're undoing the rotate transform to work out where
// the rotated origin lies.
polarDelta[1] += toRad(rotation);
normalisedDelta = toCartesian(polarDelta);
width = start.width + normalisedDelta[0];
height = start.height + normalisedDelta[1];
width = width >= 0 ? width : 0;
height = height >= 0 ? height : 0;
originDelta = [
e.distX/2 - (width === 0 ? -start.width/2 : normalisedDelta[0]/2),
e.distY/2 - (height === 0 ? -start.height/2 : normalisedDelta[1]/2)
];
box.css({
left: start.left + originDelta[0],
top: start.top + originDelta[1],
width: width,
height: height
});
// Guides
originMark.css({
left: start.left + originDelta[0],
top: start.top + originDelta[1]
});
centreMark.css({
left: start.left + originDelta[0] + width/2,
top: start.top + originDelta[1] + height/2
})
});
})();
(function(){
var centre, startRotate, startAngle, positionParent, offset;
rotate
.on('movestart', function(e){
positionParent = box.parent();
offset = positionParent.offset();
centre = {
x: parseInt(box.css('left')) + box.width()/2,
y: parseInt(box.css('top')) + box.height()/2
};
startRotate = rotation;
startAngle = toPolar([e.pageX - offset.left - centre.x, e.pageY - offset.top - centre.y])[1];
// Guides
originMark.css({
left: box.css('left'),
top: box.css('top')
});
centreMark.css({
left: centre.x,
top: centre.y
});
})
.on('move', function(e){
var nowAngle = toPolar([e.pageX - offset.left - centre.x, e.pageY - offset.top - centre.y])[1],
deltaRotate = nowAngle - startAngle,
transform;
rotation = parseInt(startRotate - toDeg(deltaRotate));
transform = 'rotate(' + rotation + 'deg)';
box.css({
transform: transform,
WebkitTransform: transform,
MozTransform: transform
});
});
})();
// Test properties
(function(){
// Test for correct deltaX and deltaY values
var distX = 0, distY = 0, pageX = 0, pageY = 0, startX = 0, startY = 0;
box
.on('movestart', function(e) {
startX = e.startX;
startY = e.startY;
distX = e.distX;
distY = e.distY;
pageX = e.pageX;
pageY = e.pageY;
console.log('movestart e.startX:', e.startX, 'e.distX:', e.distX, 'e.pageX:', e.pageX);
console.log('movestart e.startY:', e.startY, 'e.distY:', e.distY, 'e.pageY:', e.pageY);
})
.on('move movend', function(e){
// All these statements should be true
console.assert(e.startX === startX, 'e.startX property not correct. Expected:', startX, 'Actual:', e.startX);
console.assert(e.startY === startY, 'e.startY property not correct. Expected:', startY, 'Actual:', e.startY);
console.assert(e.deltaX === e.distX - distX, 'e.deltaX property not correct. e.startX:', e.startX, 'e.distX:', e.distX, 'e.deltaX:', e.deltaX, 'e.pageX:', e.pageX);
console.assert(e.deltaY === e.distY - distY, 'e.deltaY property not correct. e.startY:', e.startY, 'e.distY:', e.distY, 'e.deltaY:', e.deltaY, 'e.pageY:', e.pageY);
console.assert(e.deltaX === e.pageX - pageX, 'e.pageX property not correct. e.startX:', e.startX, 'e.distX:', e.distX, 'e.deltaX:', e.deltaX, 'e.pageX:', e.pageX);
console.assert(e.deltaY === e.pageY - pageY, 'e.pageY property not correct. e.startY:', e.startY, 'e.distY:', e.distY, 'e.deltaY:', e.deltaY, 'e.pageY:', e.pageY);
distY = e.distY;
distX = e.distX;
pageX = e.pageX;
pageY = e.pageY;
});
})();
});
</script>
</body>
</html>