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Editorial Team
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Asked: 2026-05-12T08:42:54+00:00

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

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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 ‘about’, to the body tag:

<body class="about">

How can I do that?

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1 Answer

  1. Editorial Team

    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
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