JAVASCRIPT

js add class

var element = document.getElementById('element');
element.classList.add('class-1');
element.classList.add('class-2', 'class-3');
element.classList.remove('class-3');

javascript add class

// getting the target element
var myElement = document.querySelector('#myElement');

// example for addding some-class to the element
myElement.classList.add('some-class');

// multiple classes can be added like this
myElement.classList.add('one-class', 'one-more-class');

// example for removing any class from the element
myElement.classList.remove('any-class');

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')
      }
    })
  }
})

addclass javascript

var someElement= document.getElementById("myElement");
    someElement.className += " newclass";//add "newclass" to element (space in front is important)

add class to element javascript

element.classList.add('class');
element.classList.remove('class');

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

const div = document.createElement('div');
div.className = 'foo';

// our starting state: <div class="foo"></div>
console.log(div.outerHTML);

// use the classList API to remove and add classes
div.classList.remove("foo");
div.classList.add("anotherclass");

// <div class="anotherclass"></div>
console.log(div.outerHTML);

// if visible is set remove it, otherwise add it
div.classList.toggle("visible");

// add/remove visible, depending on test conditional, i less than 10
div.classList.toggle("visible", i < 10 );

console.log(div.classList.contains("foo"));

// add or remove multiple classes
div.classList.add("foo", "bar", "baz");
div.classList.remove("foo", "bar", "baz");

// add or remove multiple classes using spread syntax
const cls = ["foo", "bar"];
div.classList.add(...cls);
div.classList.remove(...cls);

// replace class "foo" with class "bar"
div.classList.replace("foo", "bar");

js add class to html

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

javascript add class

<p id="id1">Javascript adds a CSS class to this paragraph.</p>

<script>
  // Get the element with id="id1"
  const element = document.getElementById("id1");
  
  // Add a class
  // METHOD 1
  element.classList.add("quote");
  
  // METHOD 2
  element.className += "box";
</script>

How to add a class to html element js

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

js add class

const element = document.querySelector('.my-element');
element.classList.add('animate__animated', 'animate__bounceOutLeft');

how to add class to new element javascript

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

    exampleElement.classList.add("exampleClass");

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

javascript add method to a class

MyClassName.prototype.methodName = function() {
    console.log("Hi!");
};