How to add a class to body tag?

Question

I want to add a class to a body tag with jQuery.

For example if the URL is http://www.mywebsite.com/about_us.asp, I want add the first five letters, in this case \'a

Answer 1

This should do it:

var newClass = window.location.href;
newClass = newClass.substring(newClass.lastIndexOf('/')+1, 5);
$('body').addClass(newClass);

The whole "five characters" thing is a little worrisome; that kind of arbitrary cutoff is usually a red flag. I'd recommend catching everything until an _ or .:

newClass = newClass.match(/\/[^\/]+(_|\.)[^\/]+$/);

That pattern should yield the following:

• ../about_us.html : about
• ../something.html : something
• ../has_two_underscores.html : has