leaflet/src/core/Browser.js

JavaScript library for mobile-friendly interactive maps

/*
 * L.Browser handles different browser and feature detections for internal Leaflet use.
 */

(function () {

	var ua = navigator.userAgent.toLowerCase(),
	    doc = document.documentElement,

	    ie = 'ActiveXObject' in window,

	    webkit    = ua.indexOf('webkit') !== -1,
	    phantomjs = ua.indexOf('phantom') !== -1,
	    android23 = ua.search('android [23]') !== -1,
	    chrome    = ua.indexOf('chrome') !== -1,
	    gecko     = ua.indexOf('gecko') !== -1  && !webkit && !window.opera && !ie,

	    mobile = typeof orientation !== 'undefined' || ua.indexOf('mobile') !== -1,
	    msPointer = !window.PointerEvent && window.MSPointerEvent,
	    pointer = (window.PointerEvent && navigator.pointerEnabled) || msPointer,

	    ie3d = ie && ('transition' in doc.style),
	    webkit3d = ('WebKitCSSMatrix' in window) && ('m11' in new window.WebKitCSSMatrix()) && !android23,
	    gecko3d = 'MozPerspective' in doc.style,
	    opera12 = 'OTransition' in doc.style;

	var touch = !window.L_NO_TOUCH && !phantomjs && (pointer || 'ontouchstart' in window ||
			(window.DocumentTouch && document instanceof window.DocumentTouch));

	L.Browser = {
		ie: ie,
		ielt9: ie && !document.addEventListener,
		webkit: webkit,
		gecko: gecko,
		android: ua.indexOf('android') !== -1,
		android23: android23,
		chrome: chrome,
		safari: !chrome && ua.indexOf('safari') !== -1,

		ie3d: ie3d,
		webkit3d: webkit3d,
		gecko3d: gecko3d,
		opera12: opera12,
		any3d: !window.L_DISABLE_3D && (ie3d || webkit3d || gecko3d) && !opera12 && !phantomjs,

		mobile: mobile,
		mobileWebkit: mobile && webkit,
		mobileWebkit3d: mobile && webkit3d,
		mobileOpera: mobile && window.opera,
		mobileGecko: mobile && gecko,

		touch: !!touch,
		msPointer: !!msPointer,
		pointer: !!pointer,

		retina: (window.devicePixelRatio || (window.screen.deviceXDPI / window.screen.logicalXDPI)) > 1
	};

}());