Learn how to detect browser in javascript

In this programming tutorial you will learn how to detect the browser in javascript. Browser detection is a very important part of the web development. Sometimes it can be very handy to detect the visitor's browser and then serve the suitable information. Let’s have a look over the javascript code given below. This code will give you the exact browser name and its version, so that's why it is different from source codes available in other websites :)

Browser detection in javascript

<script language="javascript" type="text/javascript">
<!--
var DetectBrowser = {
 init: function () {
  this.browser = this.searchString(this.dataBrowser) || "An unknown browser";
  this.version = this.searchVersion(navigator.userAgent)
   || this.searchVersion(navigator.appVersion)
   || "an unknown version";
  
 },
 searchString: function (data) {
  for (var i=0;i<data.length;i++) {
   var dataString = data[i].string;
   var dataProp = data[i].prop;
   this.versionSearchString = data[i].versionSearch || data[i].identity;
   if (dataString) {
    if (dataString.indexOf(data[i].subString) != -1)
     return data[i].identity;
   }
   else if (dataProp)
    return data[i].identity;
  }
 },
 searchVersion: function (dataString) {
  var index = dataString.indexOf(this.versionSearchString);
  if (index == -1) return;
  return parseFloat(dataString.substring(index+this.versionSearchString.length+1));
 },
 dataBrowser: [
  {
   string: navigator.userAgent,
   subString: "Chrome",
   identity: "Chrome"
  },
  {  string: navigator.userAgent,
   subString: "OmniWeb",
   versionSearch: "OmniWeb/",
   identity: "OmniWeb"
  },
  {
   string: navigator.vendor,
   subString: "Apple",
   identity: "Safari",
   versionSearch: "Version"
  },
  {
   prop: window.opera,
   identity: "Opera"
  },
  {
   string: navigator.vendor,
   subString: "iCab",
   identity: "iCab"
  },
  {
   string: navigator.vendor,
   subString: "KDE",
   identity: "Konqueror"
  },
  {
   string: navigator.userAgent,
   subString: "Firefox",
   identity: "Firefox"
  },
  {
   string: navigator.vendor,
   subString: "Camino",
   identity: "Camino"
  },
  {  // for newer Netscapes (6+)
   string: navigator.userAgent,
   subString: "Netscape",
   identity: "Netscape"
  },
  {
   string: navigator.userAgent,
   subString: "MSIE",
   identity: "Internet Explorer",
   versionSearch: "MSIE"
  },
  {
   string: navigator.userAgent,
   subString: "Gecko",
   identity: "Mozilla",
   versionSearch: "rv"
  },
  {   // for older Netscapes (4-)
   string: navigator.userAgent,
   subString: "Mozilla",
   identity: "Netscape",
   versionSearch: "Mozilla"
  }
 ]
 
};
DetectBrowser.init();
alert("Browser name is "+DetectBrowser.browser);
alert("Browser version is "+DetectBrowser.version);
// -->
</script>

Note:-
The version detect doesn't work in Safari and OmniWeb because these browsers donot include appropriate version information in their identity string.

So that’s it. This is the way to detect browser in javascript.
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