Determine if an element has a CSS class with jQuery

Question

I'm working with jQuery and looking to see if there is an easy way to determine if the element has a specific CSS class associated with it.

I have the id of the element, and the CSS class that I'm looking for. I just need to be able to, in an if statement, do a comparison based on the existence of that class on the element.

Answer 1

Use the hasClass method:

jQueryCollection.hasClass(className);

or

$(selector).hasClass(className);

The argument is (obviously) a string representing the class you are checking, and it returns a boolean (so it doesn't support chaining like most jQuery methods).

Answer 2

from the FAQ

elem = $("#elemid");
if (elem.is (".class")) {
   // whatever
}

or:

elem = $("#elemid");
if (elem.hasClass ("class")) {
   // whatever
}

Answer 3

As for the negation, if you want to know if an element hasn't a class you can simply do as Mark said.

if (!currentPage.parent().hasClass('home')) { do what you want }