Language References

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Retrieves a string equivalent to the HTTP user-agent request header.

HTML	N/A
Script	[ sUserAgent = ] navigator.userAgent

sUserAgent

String specifying a valid HTTP user agent.

The property is read-only with a browser-specific default value.

The following script detects the current user's browser and displays its appName and userAgent attributes in an alert box.

<script language="JavaScript">
<!--
function getBrowser ( ) {
   var browser = navigator.appName;
   browser += "\n" + navigator.userAgent;
   alert ( browser );
}
//-->
</script>

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This attribute can be used to determine the user's operating system, for example, if using a Windows NT operating system was a requirement for the script. A variable "isNT" checks to see if the string "NT" is found in the string returned by userAgent; if not, the variable is set to -1. Other scripts can then refer to the variable as needed.

<script language="JavaScript">
var isNT = navigator.userAgent.indexOf ( "NT" );
if ( isNT > 1 )
  ... code for WinNT
else
  ... code for others
</script>

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