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I read a book calls 'Professional Javascript For Web Developers 2nd edition' and it state that this code can detect browser rendering engine:
<script type="text/javascript">
var client = function(){
var engine = {
ie: 0,
gecko: 0,
webkit: 0,
khtml: 0,
opera: 0,
ver: null
};
return {
engine : engine
};
}();
if(client.engine.ie){
alert("This is internet explorer");
}else if(client.engine.gecko > 1.5){
if(client.engine.ver == "1.8.1"){
alert("This is gecko rendering browser");
}
}else if(client.engine.webkit){
alert("This is web kit");
}else if(client.engine.khtml){
alert("This is khtml");
}else{
alert("none of the above");
}
</script>
but it seems like doesn't work, so how this code work to detect browser rendering engine?Thanks
673
How to detect the user browser ( Safari, Chrome, IE, Firefox and Opera ) using JavaScript ? The browser on which the current page is opening can be checked using JavaScript. The userAgent property of the navigator object is used to return the user-agent header string sent by the browser.
You can use the navigator. appName and navigator. userAgent properties. The userAgent property is more reliable than appName because, for example, Firefox (and some other browsers) may return the string "Netscape" as the value of navigator.
In the browser's toolbar, click on “Help"or the Settings icon. Click the menu option that begins “About” and you'll see what type and version of browser you are using.
If you read the rest of the chapter and download the source
then you can look at client.js:
It still works in IE10 on win7 and Chrome 67 on Win10
It needs a little change to handle IE11 (Trident/) and Edge(Edge/) - see later
var client = 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,
safari: 0,
//specific version
ver: null
};
//platform/device/OS
var system = {
win: false,
mac: false,
x11: false,
//mobile devices
iphone: false,
ipod: false,
nokiaN: false,
winMobile: false,
macMobile: false,
//game systems
wii: false,
ps: false
};
//detect rendering engines/browsers
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);
//figure out if it's 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 {
//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)) { // add Trident/ to test IE11, Edge for Edge
engine.ver = browser.ver = RegExp["$1"];
engine.ie = browser.ie = 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;
default:
system.win = "NT";
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.nokiaN = ua.indexOf("NokiaN") > -1;
system.winMobile = (system.win == "CE");
system.macMobile = (system.iphone || system.ipod);
//gaming systems
system.wii = ua.indexOf("Wii") > -1;
system.ps = /playstation/i.test(ua);
//return it
return {
engine: engine,
browser: browser,
system: system
};
}();
console.log(client.browser,client.engine,client.system)It needs a little change to handle IE11 (Trident/) and Edge(Edge/)
var client = function() {
//rendering engines
var engine = {
ie: 0,
edge: 0,
gecko: 0,
webkit: 0,
khtml: 0,
opera: 0,
//complete version
ver: null
};
//browsers
var browser = {
//browsers
ie: 0,
edge: 0,
firefox: 0,
safari: 0,
konq: 0,
opera: 0,
chrome: 0,
safari: 0,
//specific version
ver: null
};
//platform/device/OS
var system = {
win: false,
mac: false,
x11: false,
//mobile devices
iphone: false,
ipod: false,
nokiaN: false,
winMobile: false,
macMobile: false,
//game systems
wii: false,
ps: false
};
//detect rendering engines/browsers
var ua = navigator.userAgent;
if (window.opera) {
engine.ver = browser.ver = window.opera.version();
engine.opera = browser.opera = parseFloat(engine.ver);
}
else if (/Edge\/([^;]+)/.test(ua)) { // IE11
engine.ver = browser.ver = RegExp["$1"];
engine.edge = browser.edge = 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 (/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 {
//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)) { // IE <= 10
engine.ver = browser.ver = RegExp["$1"];
engine.ie = browser.ie = parseFloat(engine.ver);
} else if (/Trident\/([^;]+)/.test(ua)) { // IE11
engine.ver = RegExp["$1"];
browser.ver = parseFloat(ua.split("rv:")[1]);
engine.ie = parseFloat(browser.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;
default:
system.win = "NT";
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.nokiaN = ua.indexOf("NokiaN") > -1;
system.winMobile = (system.win == "CE");
system.macMobile = (system.iphone || system.ipod);
//gaming systems
system.wii = ua.indexOf("Wii") > -1;
system.ps = /playstation/i.test(ua);
//return it
return {
engine: engine,
browser: browser,
system: system
};
}();
console.log(JSON.stringify({ browser:client.browser,engine:client.engine,system:client.system},null, 2));If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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