touchend event properties
JavascriptJqueryTouchMobile SafariTouch EventJavascript Problem Overview
If I catch all touchend events from mobile devices with:
$(document.body).bind('touchend', function (e) {
var touch = e.touches[0]; // doesnt work
...
I need to get the touch.screenX, touch.screenY, touch.clientX and touch.clientX from the e paramter. All the examples I've seen suggest that e.touches will be a collection, and you can get at the touch details with e.touches[0]
. In my tests on an ipad, e.touches
is always undefined. I'm not using any jquery plugins.
Also tried e.targetTouches, which is also undefined.
Can anyone help?
Javascript Solutions
Solution 1 - Javascript
Actually, released touches will be found in the changedTouches array, ie:
e.changedTouches[0].pageX // get the end x page coordinate for a released touch
I think this is slightly more reliable than going through the originalEvent property.
You can read more on changedTouches here: http://www.w3.org/TR/touch-events/#changedtouches-of-a-touchevent
Solution 2 - Javascript
The touches property is an TouchList object. You can see the TouchList class reference here.
If you monitor its length property with this example code on #log div:
$('#element').bind('touchstart', function(event)
{
$('#log').append(event.originalEvent.touches.length+'<br/>');
});
$('#element').bind('touchmove', function(event)
{
$('#log').append(event.originalEvent.touches.length+'<br/>');
});
$('#element').bind('touchend', function(event)
{
$('#log').append(event.originalEvent.touches.length+'<br/>');
});
you will obtain 1 while executing touchstart and touchmove, an 0 when executing touchend. That is why you obtain undefined from e.touches[0]
.