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Browser Detection
Description It can be very useful to detect the visitor's browser.   No. of Views     1389
  Rating     4
Author Najmul Hoda   Posted On     10 Feb 2010
Tags Java Script    

Sample Code   Download Code

Introduction
Before explaining the article, I would like to thank all readers who read my article and voted for it. Your appreciation for my article gives me strength to write more good articles. Hope in future I will get your valuable comments and suggestions. Now I won't waste your time and come back to the topic. I have written this article on ‘Browser Detection’. Sometimes it can be very useful to detect the visitor's browser, and then serve up the appropriate information.
So, sometimes it can be very useful to detect the visitor's browser, and then serve up the appropriate information.
The best way to do this is to make your web pages smart enough to look one way to some browsers and another way to other browsers.
JavaScript includes an object called the Navigator object, that can be used for this purpose.
The Navigator object contains information about the visitor's browser name, version, and more.
The Navigator Object
The JavaScript Navigator object contains all information about the visitor's browser. We are going to look at two properties of the Navigator object:
•    appName - holds the name of the browser
•    appVersion - holds, among other things, the version of the browser
<script type="text/javascript">
var browser=navigator.appName;
var b_version=navigator.appVersion;
var version=parseFloat(b_version);

document.write("Browser name: "+ browser);
document.write("<br />");
document.write("Browser version: "+ version);
</script>

The variable browser in the example above holds the name of the browser, i.e. "Netscape" or "Microsoft Internet Explorer".
The appVersion property in the example above returns a string that contains much more information than just the version number, but for now we are only interested in the version number. To pull the version number out of the string we are using a function called parseFloat(), which pulls the first thing that looks like a decimal number out of a string and returns it.

IMPORTANT! The version number is WRONG in IE 5.0 or later! Microsoft starts the appVersion string with the number 4.0. In IE 5.0 and IE 6.0!!! Why did they do that??? However, JavaScript is the same in IE6, IE5 and IE4, so for most scripts it is ok.
The example below displays a different alert, depending on the visitor's browser:
<script type="text/javascript">
function detectBrowser()
{
var browser=navigator.appName;
var b_version=navigator.appVersion;
var version=parseFloat(b_version);
if ((browser=="Netscape"||browser=="Microsoft Internet Explorer")
  && (version>=4))
  {
  alert("Your browser is good enough!");
  }
else
  {
  alert("It's time to upgrade your browser!");
  }
}
</script>



About Author

About Author He is a team lead, having 8+ years of experience. He loves writing technical article for .Net developers. Najmul Hoda
No Photo
 
Country United States
Company BirlaSoft
Home Page http://www.magixchat.com

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