Client Detection

Here is an object for client (browser/system) detection.

var clientInfo = function () {
	//rendering engines
	var engine = {
		ie: 0,
		gecko: 0,
		webkit: 0,
		khtml: 0,
		opera: 0,
		//complete version
		ver: null
	};
	//browsers
	var browser = {
		//browsers
		ie: 0,
		firefox: 0,
		safari: 0,
		konq: 0,
		opera: 0,
		chrome: 0,
		edge: 0,
		//specific version
		ver: null
	};
	//platform/device/OS
	var system = {
		win: false,
		mac: false,
		x11: false,
		//mobile devices
		iphone: false,
		ipod: false,
		ipad: false,
		ios: false,
		android: false,
		nokiaN: false,
		winMobile: false,
		//game systems
		wii: false,
		ps: false,
		xbox: false
	};
	//detect rendering engines/browsers
	var ua = navigator.userAgent;
	if (window.opera) {
		engine.ver = browser.ver = window.opera.version();
		engine.opera = parseFloat(engine.ver);
	} else if (/AppleWebKit\/(\S+)/.test(ua)) {
		engine.ver = RegExp["$1"];
		engine.webkit = parseFloat(engine.ver);
		//figure out if it’s Chrome or Safari
		if (/Edge\/(\S+)/.test(ua)) {
			browser.ver = RegExp["$1"];
			browser.edge = parseFloat(browser.ver);
		} else if (/Chrome\/(\S+)/.test(ua) || /CriOS\/(\S+)/.test(ua)) {
			browser.ver = RegExp["$1"];
			browser.chrome = parseFloat(browser.ver);
		} else if (/Version\/(\S+)/.test(ua)) {
			browser.ver = RegExp["$1"];
			browser.safari = parseFloat(browser.ver);
		} else {
			//approximate version
			var safariVersion = 1;
			if (engine.webkit < 100) {
				safariVersion = 1;
			} else if (engine.webkit < 312) {
				safariVersion = 1.2;
			} else if (engine.webkit < 412) {
				safariVersion = 1.3;
			} else {
				safariVersion = 2;
			}
			browser.safari = browser.ver = safariVersion;
		}
	} else if (/KHTML\/(\S+)/.test(ua) || /Konqueror\/([^;]+)/.test(ua)) {
		engine.ver = browser.ver = RegExp["$1"];
		engine.khtml = browser.konq = parseFloat(engine.ver);
	} else if (/rv:([^\)]+)\) Gecko\/\d{8}/.test(ua)) {
		engine.ver = RegExp["$1"];
		engine.gecko = parseFloat(engine.ver);
		//determine if it’s Firefox
		if (/Firefox\/(\S+)/.test(ua)) {
			browser.ver = RegExp["$1"];
			browser.firefox = parseFloat(browser.ver);
		}
	} else if (/MSIE ([^;]+)/.test(ua)) {
		engine.ver = browser.ver = RegExp["$1"];
		engine.ie = parseFloat(engine.ver);
	} else if (/rv:([^\)]+)\) like Gecko/.test(ua)) {
		engine.ver = browser.ver = RegExp["$1"];
		engine.ie = engine.gecko = parseFloat(engine.ver);
	}
	//detect browsers
	browser.ie = engine.ie;
	browser.opera = engine.opera;
	//detect platform
	var p = navigator.platform;
	system.win = p.indexOf("Win") == 0;
	system.mac = p.indexOf("Mac") == 0;
	system.x11 = (p == "X11") || (p.indexOf("Linux") == 0);
	//detect windows operating systems
	if (system.win) {
		if (/Win(?:dows )?([^do]{2})\s?(\d+\.\d+)?/.test(ua)) {
			if (RegExp["$1"] == "NT") {
				switch (RegExp["$2"]) {
					case "5.0":
						system.win = "2000";
						break;
					case "5.1":
						system.win = "XP";
						break;
					case "6.0":
						system.win = "Vista";
						break;
					case "6.1":
						system.win = "7";
						break;
					case "6.2":
						system.win = "8";
						break;
					case "6.3":
						system.win = "8.1";
						break;
					default:
						system.win = RegExp["$2"];
						break;
				}
			} else if (RegExp["$1"] == "9x") {
				system.win = "ME";
			} else {
				system.win = RegExp["$1"];
			}
		}
	}
	//mobile devices
	system.iphone = ua.indexOf("iPhone") > -1;
	system.ipod = ua.indexOf("iPod") > -1;
	system.ipad = ua.indexOf("iPad") > -1;
	system.nokiaN = ua.indexOf("NokiaN") > -1;
	//windows mobile
	if (system.win == "CE") {
		system.winMobile = system.win;
	} else if (system.win == "Ph") {
		if (/Windows Phone OS (\d+.\d+)/.test(ua)) {;
			system.win = "Phone";
			system.winMobile = parseFloat(RegExp["$1"]);
		}
	}
	//determine iOS version
	if ((p.indexOf("iPhone") == 0 || system.mac) && ua.indexOf("Mobile") > -1) {
		if (/CPU (?:iPhone )?OS (\d+_\d+)/.test(ua)) {
			system.ios = parseFloat(RegExp.$1.replace("_", "."));
		} else {
			system.ios = 2; //can’t really detect - so guess
		}
	}
	//determine Android version
	if (/Android (\d+\.\d+)/.test(ua)) {
		system.android = parseFloat(RegExp.$1);
	}
	//gaming systems
	system.wii = /wii/i.test(ua);
	system.ps = /playstation/i.test(ua);
	system.xbox = /xbox/i.test(ua);
	//return it
	return {
		engine: engine,
		browser: browser,
		system: system
	};
}();