How can I check in JavaScript if a DOM element contains a class?

Question

How can I check in JavaScript if a DOM element contains a class?

I tried the following code, but for some reason it doesn\'t work...

if (document.get         


        

Answer 1

hasClass:

function hasClass(element, className) {
  return (element.className).indexOf(className) > -1;
}

containsClass:

function containsClass(element, className) {
  return Array.from(element.classList).filter(function (cls) {
    return cls.indexOf(className) > -1;
  }).length > 0;
}

codepen demo