Nov 28, 2016 · Use element.classList.add to add a class: element.classList.add("my-class"); And element.classList.remove to remove a class: element.classList.remove("my-class"); If you need to support Internet Explorer 9 or lower: Add a space plus the name of your new class to the className property of the element.

Learn how to add a class name to an element with JavaScript. Click the button to add a class to me! Add a class name to the div element with id="myDIV" (in this example we use a button to add the class). This is a DIV element. Style the specified class name: Get the <div> element with id="myDIV" and add the "mystyle" class to it:

You can use any given method to add a class to your element, another way to check for, change or remove them. The className way - Simple way to add a single or multiple classes and remove or change all classes. The classList way - The way to manipulate classes; add, change or remove a single or multiple classes at the same time. They can easily ...

To replace all existing classes with one or more new classes, set the className attribute: (You can use a space-delimited list to apply multiple classes.) To add a class to an element, without removing/affecting existing values, append a space and the new classname, like so:

Jun 26, 2024 · In JavaScript, adding a class name to an element allows you to style or manipulate it via CSS or JavaScript. This can be achieved using different methods. Here, we'll explore two common approaches: using the .className property and the .add() method.

Mar 20, 2025 · Adding a class to an element using JavaScript is a crucial technique for dynamically modifying web applications, particularly in automated testing scenarios. Classes are often used to apply styles, manage states, or trigger specific behaviors in response to user interactions or test conditions.

Sep 17, 2022 · Javascript allows you to add classes to the body of your webpage through document.body or document.getElementById("id"). Classes can either be added directly to an HTML element as an attribute (Ex: <p class="para-class">) or by using JavaScript (which is what we’ll look at in this section).

Jan 29, 2024 · Learn how to add a class to an element in JavaScript using className, classList, toggle and setAttribute method, with examples.

If you want to create a JavaScript function that will add a class to the <div> element, there are some methods of doing it in JavaScript. The className property of the Element interface is used for getting and setting the value of the given element's class attribute. First, put an id on the element to get a reference: </div>

Nov 13, 2021 · Today we are going to work on how to add class to an element using JavaScript. We will explore 4 ways on how to add class to any element in the DOM, including body and html element. Add class using className The most straightforward way of adding a class is using className propery.