JAVASCRIPT

addclass js vanilla

  element.classList.add('className');

vanilla javascript add class

document.addEventListener("DOMContentLoaded", function() {
  var faqContainers = document.getElementsByClassName('faq-container')
  var faqToggle = document.getElementsByTagName('body')[0]
  for (var i = 0; i < faqContainers.length; i++) {

    faqContainers[i].addEventListener('click', function() {
      if (faqToggle.classList.contains('faq-display')) {
        faqToggle.classList.remove('faq-display')
      } else {
        faqToggle.classList.add('faq-display')
      }
    })
  }
})

javascript add class to element

const element = document.querySelector('CSS_SELECTOR')

element.classList.add('class-1') // add class-1
element.classList.remove('class-1') // remove class-1
element.classList.toggle('class-1') // add class-1 if the element does not contains the class, remove if not.

how to add a class to an element in javascript

// This is to add a class to any html element after you store it
// in the element variable 

element.classList.add("my-class-name");

// This is to remove a class from the element

element.classlist.remove("my-class-name");

js add class to html

const root = document.getElementsByTagName('html')[0]
root.classList.add('hide-scrollbar')

How to add a class to html element js

element.classList.add("my-class");

add class to new element js

    const exampleElement = document.createElement('div');

    exampleElement.classList.add("exampleClass");

	const container = document.getElementById('container1');
    container.appendChild(exampleElement);