Escape square brackets when assigning a class name to an element

Question

Does anyone know how to escape the square bracket character when setting a class name with jQuery?

Try the following:

$(\'#txtFirstname\').addClass(\         


        

Answer 1

The introduction of jQuery API page gives the above explanation about this:

To use any of the meta-characters ( such as !"#$%&'()*+,./:;<=>?@[]^`{|}~ ) as a literal part of a name, it must be escaped with with two backslashes: \\.