Question

How to add class name to HTML element without removing the existing class names in JavaScript

Answer 1

<div class="container" id="divid"></div>

const element = document.getElementById("divid");

console.log(element.className);

element.classList.add("new_classname");

console.log(element.className);


    
    
/*
run:

container"
"container new_classname"

*/

 

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