Add a class to a DIV with javascript

Question

Example HTML:

How can I add the class class_two without replacing

Answer 1

You may use jQuery.

$('#YourElement').addClass('YourClass'); //add

$('#YourElement').removeClass('YourClass'); //remove

$('#YourElement').toggleClass('YourClass'); //toggle

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Or Javascript, if you wish.

document.getElementById('id').classList.add('YourClass'); //add
document.getElementById('id').classList.remove('YourClass'); //remove