className only changing every other class

Question

I\'m performing a small text with JavaScript with the getElementsByClassName() and I am getting some unwanted results. I would like the script to change each CS

Answer 1

By assigning a value to .className you overwrite every class on that element. What you might want to take a look at is the .classList attribute.

Remove a class:

blockSet[0].classList.remove('block-default');

Add the new class:

blockSet[0].classList.add('block-selected');

A good point to start with, when your trying to do stuff, jQuery usually did for you, is http://youmightnotneedjquery.com/