Detect client info

client.js

//Source code on [Professional JavaScript for Web Developers]

var client = (function() {

	var engine = {
		//Graphic Engine
		ie: 0,
		gecko: 0,
		webkit: 0,
		khtml: 0,
		opera: 0,

		//Detailed version
		ver: null
	};
	var browser = {
		ie: 0,
		firefox: 0,
		konq: 0,
		opera: 0,
		chrome: 0,
		safari: 0,

		//Detailed version
		ver: null
	};

	//Platform, Device and OS
	var system =  {
		win: false,
		mac: false,
		x11: false,

		//Mobile device
		iphone: false,
		ipod: false,
		nokiaN: false,
		winMobile: false,
		macMobile: false,

		//Game system
		wii: false,
		ps: false
	};


	//Detect graphic engine and browser
	var ua = navigator.userAgent;
	if (window.opera) {
		engine.ver = browser.ver = window.opera.version();
		engine.opera = browser.opera = parseFloat(engine.ver);
	} else if (/AppleWebKit\/(\S+)/.test(ua)) {
		engine.ver = RegExp["$1"];
		engine.webkit = parseFloat(engine.ver);

		//Confirm whether Chrome or Safari
		if (/Chrome\/(\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 {
			//Get a 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);

		//Confirm 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 = browser.ie = parseFloat(engine.ver);
	}

	//Detect browser
	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 OS
	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;
					default:
						system.win = "NT";
						break;
				}
			} else if (RegExp["$1"] == "9x") {
				system.win = "ME";
			} else {
				system.win = RegExp["$1"];
			}
		}
	}

	//Mobile device
	system.iphone = ua.indexOf("iPhone") > -1;
	system.ipod = ua.indexOf("iPod") > -1;
	system.nokiaN = ua.indexOf("nokiaN") > -1;
	system.winMobile = (system.win == "CE");
	system.macMobile = (system.iphone || system.ipod);

	//Game system
	system.wii = ua.indexOf("Wii") > -1;
	system.ps = /playstation/i.test(ua);

	//Return all these objects
	return {
		engine: engine,
		browser: browser,
		system: system
	};

})();