modernizr
Version:
Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.
53 lines (45 loc) • 2.06 kB
JavaScript
/*!
{
"name": "Touch Events",
"property": "touchevents",
"caniuse" : "touch",
"tags": ["media", "attribute"],
"notes": [{
"name": "Touch Events spec",
"href": "http://www.w3.org/TR/2013/WD-touch-events-20130124/"
}],
"warnings": [
"Indicates if the browser supports the Touch Events spec, and does not necessarily reflect a touchscreen device"
],
"knownBugs": [
"False-positive on some configurations of Nokia N900",
"False-positive on some BlackBerry 6.0 builds – https://github.com/Modernizr/Modernizr/issues/372#issuecomment-3112695"
]
}
!*/
/* DOC
Indicates if the browser supports the W3C Touch Events API.
This *does not* necessarily reflect a touchscreen device:
* Older touchscreen devices only emulate mouse events
* Modern IE touch devices implement the Pointer Events API instead: use `Modernizr.pointerevents` to detect support for that
* Some browsers & OS setups may enable touch APIs when no touchscreen is connected
* Future browsers may implement other event models for touch interactions
See this article: [You Can't Detect A Touchscreen](http://www.stucox.com/blog/you-cant-detect-a-touchscreen/).
It's recommended to bind both mouse and touch/pointer events simultaneously – see [this HTML5 Rocks tutorial](http://www.html5rocks.com/en/mobile/touchandmouse/).
This test will also return `true` for Firefox 4 Multitouch support.
*/
define(['Modernizr', 'prefixes', 'testStyles'], function( Modernizr, prefixes, testStyles ) {
// Chrome (desktop) used to lie about its support on this, but that has since been rectified: http://crbug.com/36415
Modernizr.addTest('touchevents', function() {
var bool;
if(('ontouchstart' in window) || window.DocumentTouch && document instanceof DocumentTouch) {
bool = true;
} else {
var query = ['@media (',prefixes.join('touch-enabled),('),'heartz',')','{#modernizr{top:9px;position:absolute}}'].join('');
testStyles(query, function( node ) {
bool = node.offsetTop === 9;
});
}
return bool;
});
});