check if class exists code example

Example 1: check if a class exists javascript

const element = document.querySelector("#box");

element.classList.contains("active");

Example 2: if a class exists jquery

if ($(".mydivclass").length){
    // Do something if class exists
} else {
    // Do something if class does not exist
}

Example 3: check if a class exists javascript

<div id="box" class="active"></div>