How do I add a class to a given element?

Question

I have an element that already has a class:

Answer 1

You can use the classList.add OR classList.remove method to add/remove a class from a element.

var nameElem = document.getElementById("name")
nameElem.classList.add("anyclss")

The above code will add(and NOT replace) a class "anyclass" to nameElem. Similarly you can use classList.remove() method to remove a class.

nameElem.classList.remove("anyclss")