jQuery add CSS class

Question

I want to remove a css class before adding a new class to an element. If I know which exact class the element has already, I can remove that by

$('#test').removeClass('current_class').addClass('new_class');

But the problem is that #test does not have always same class. So I would like to remove any css class attached attached to #test before adding before adding a new one. How should I do that? Thanks.

• Christian: It always helps to read the docs - .removeClass()

Answer 1

$('#test').removeClass();

Will remove any class that the item has you can simply add your new class after that like you are doing now

Answer 2

$('#test').attr('class', '').addClass('new_class');

or

$('#test').removeClass().addClass('new_class');

Answer 3

How many different classes do you have?!

You could make a distinct check for each class

var not_allowed = ["class_1", "class_2", "class_3"];
for(i = 0; i < not_allowed.length; i++){
 if($("#test").hasClass(not_allowed[i])) $("#test").removeClass(not_allowed[i])
}
$("#test").addClass("new_class");

Or you could remove all classes at once with .removeClass() without any parameters and then add the new class

$("#test").removeClass().addClass("new_class");

Answer 4

Firstly remove all the classes using jQuery's removeClass() function and then add the classes according to your need.

Code is

$('your class').removeClass();