Follow Techotopia on Twitter

On-line Guides
All Guides
eBook Store
iOS / Android
Linux for Beginners
Office Productivity
Linux Installation
Linux Security
Linux Utilities
Linux Virtualization
Linux Kernel
System/Network Admin
Scripting Languages
Development Tools
Web Development
GUI Toolkits/Desktop
Mail Systems
Eclipse Documentation

How To Guides
General System Admin
Linux Security
Linux Filesystems
Web Servers
Graphics & Desktop
PC Hardware
Problem Solutions
Privacy Policy




The JavaScript FAQ
Prev Home Next

Browser Window Size

Question: How do I get the browser window size?

Answer: To determine the actual size of the browser window, use the following properties:

  • in Netscape Navigator 4:
    window.innerWidth, window.innerHeight
  • in Microsoft Internet Explorer:
    document.body.offsetWidth, document.body.offsetHeight
Note that the code that uses document.body.offsetWidth and document.body.offsetHeight must be executed after the browser has parsed the <BODY> tag.

The following code sets the variables winW and winH to the actual width and height of the browser window, and outputs the width and height values. If the user has an old browser, then winW and winH are set to 630 and 460, respectively.

var winW = 630, winH = 460;

if (parseInt(navigator.appVersion)>3) {
 if (navigator.appName=="Netscape") {
  winW = window.innerWidth;
  winH = window.innerHeight;
 if (navigator.appName.indexOf("Microsoft")!=-1) {
  winW = document.body.offsetWidth;
  winH = document.body.offsetHeight;

 "Window width = "+winW+"<br>"
+"Window height = "+winH

In your browser, this code produces the following output:

Note that if the above code executes within a frame, it will give you the frame's width and height.

To adjust the width and height values taking into accout the scrollbars:

  • in Netscape Navigator: subtract 16 from the width and height
  • in Microsoft Internet Explorer: subtract 20 from the width and height
Thus, the code adjusted for scrollbars might look as follows:
if (parseInt(navigator.appVersion)>3) {
 if (navigator.appName=="Netscape") {
  winW = window.innerWidth-16;
  winH = window.innerHeight-16;
 if (navigator.appName.indexOf("Microsoft")!=-1) {
  winW = document.body.offsetWidth-20;
  winH = document.body.offsetHeight-20;
} Copyright © 1999-2006, Alexei Kourbatov

The JavaScript FAQ
Prev Home Next

  Mirrored with kind permission of Alexei Kourbatov Design by Interspire