The ua.js help file

This script source file uses the function xbDetectBrowser to set a number of properties for the navigator and navigator.examined objects.

function F()

This empty function is used to determine ECMAScript capabilities.

function xbDetectBrowser()

This function is partly derivative work on the now dated Practical Browser Sniffer. It works with JavaScript from language version 1.0 browsers. It is executed instantly.

Properties added to the navigator object

navigator.kin

Returns a string resolved by the concatenation navigator.appName + '/' + parseInt(navigator.appVersion). This way the resulting string would be "Microsoft Internet Explorer/4" if Internet Explorer was used. To simplify matters, the script will instead return "MSIE/4". A few examples:

• "MSIE/4" Internet Explorer 4 and later and also Opera spoofing as Internet Explorer
  
• "Netscape/4" Netscape Navigator 4
• "Netscape/5" Browsers belonging to the Gecko family such as Netscape 6 and later, Firefox, SeaMonkey
  
• "Opera/N" Opera browsers (if spoofing is not used) where "N" represents the application version number integer 3, 4, 5, ... 9.

navigator.family

Returns a string, which will be empty if the browser doesn't belong to one of the families listed. The formerly possible values hotjava and aol are removed. Current possible values:

• "gecko" browsers based upon mozilla.org open source code, e.g. Netscape 6+, Firefox, SeaMonkey, Galeon, K-Meleon
• "opera" Opera browsers versions before 7
• "presto" Opera browsers versions 7 and later
• "applewebkit" browsers applying the AppleWebKit, e.g. Safari, OmniWeb
• "ie3" Internet Explorer versions before 4
• "ie4" Internet Explorer versions 4 and later, Netscape Browser 8 when the trident plugin is applied
• "java" java based browsers, e.g. ICEbrowser
• "nnN " where "N" is a Netscape version major integer, usually nn2, nn3 or nn4
• ""

navigator.version

Returns a number, which will be a floating point number from the number part of the navigator.appVersion property, if the browser doesn't belong to one of the families listed or belongs to the "java" family. So, for browsers where navigator.family is other than empty, the property will normally be the rendering engine specific version number as seen in the list:

• "gecko" browsers will return the build date from the navigator.productSub property, such as 20060516.
• "opera" browsers return the normal version number.
• "presto" browsers return the normal version number.
• "applewebkit" browsers return the particular AppleWebKit version number (stripping it off the number past the second dot).
• "ie3" and "ie4" browsers return the normal version number, and Netscape Browser (applying the trident engine) returns the "MSIE" specific number from the user agent string.
• Netscape Navigator browsers return the normal version number.

navigator.rv

Returns a string, which is identical with the release version number if it exists and the navigator.family value is gecko. If not, the property is empty:

• e.g. "1.8.0.4"
• ""

navigator.rversion

Returns a number, which is the release version number in double floating points if the navigator.rv value is other than empty. If not, the property is 0.

• e.g. 1.080004
• 0

navigator.prettyName

Returns a string, usually identical with the first or last word(s) of navigator.userAgent.

navigator.prettyVersion

Returns a string, which is identical with the number put in relation with navigator.prettyName.

navigator.js

Returns a number for the evaluated client-side JavaScript language version up to version 1.3. (Testing beyond that point would necessarily break simpler script engines.)

• 1.3 The script engine is compliant with ECMAScript, edition 1, and has not undefined values for the call and apply methods of functions (and fulfills the 1.2 requirements below).
  
• 1.2 The script engine has not undefined values for navigator.platform and screen and has a way of determining the natural language of the browser or system (and fulfills the 1.1 requirements below).
• 1.1 The script engine has not undefined values for Date.prototype.getTimezoneOffset, navigator.javaEnabled, navigator.mimeTypes and navigator.plugins.
• 1.0 Netscape Navigator 2, Internet Explorer before version 4
  
• 0 unknown version