check if css class exist and if yes how many times

Question

I'd like to know if a style class exists and if yes, how many elements have it.

To know if a style class exists, I use:

if ($("*").hasClass('ui-state-active')) {
    alert("class exist : "+nb_checked);
}

But to know how many elements have the class, I can't figure out.

Answer 1

This is a simpler approach:

$('.ui-state-active').length