Question

Using vanilla javascript or prototype can someone show me how I could run a check to see if a class exists? For example I am adding a class called hideIt with this code :

var overlay = document.getElementById("overlay_modal");
overlay.className += " hideIt";

I also need a script that later can check to see if hideIt exists. I have tried things like :

if (overlay.className == "hideIt")

But that is no good. Any ideas?

Answer 1

Use a regexp. \b will match word boundaries (a space, a newline character, punctuation character or end of string).

var overlay = document.getElementById("overlay_modal");
if (overlay.className.match(/\bhideIt\b/)) 
{
    // frob a widget
}