jQuery hasClassName prototypejs function: How to check if element has class with JQuery

To determine if an element has a class register with jQuery you can use the function .hasClass() which is shorter for .hasClassName() in prototypejs

if($('#target').hasClass('foo')){
  // Do something
}

// With Prototype js you would use...

if($('target').hasClassName('foo')){
  // Do something
}