jQuery - get the index of a element with a certain class

Question

I have a list like this one:

 .... 
 .... 
 .... 
 .... 
         


        

Answer 1

With the .index() :

$('li.active').index()

Working example here:

http://jsfiddle.net/EcZZL/

Edit - added link to the api for .index() per Nick's advice