Check if class exists somewhere in parent - vanilla JS

Question

I\'m really struggling to see how to do this. I want to check if a class exsits somewhere in one of the parent elements of an element.

I don\'t want to use any libra

Answer 1

The fiddle

The code

function hasClass(element, className) {
  var regex = new RegExp('\\b' + className + '\\b');
  do {
    if (regex.exec(element.className)) {
      return true;
    }
    element = element.parentNode;
  } while (element);
  return false;
}

OR

function hasClass(element, className) {
  do {
    if (element.classList && element.classList.contains(className)) {
      return true;
    }
    element = element.parentNode;
  } while (element);
  return false;
}