How To Add A Class Name - W3Schools

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How TO - Add a Class ❮ Previous Next ❯

Learn how to add a class name to an element with JavaScript.

Add Class Click the button to add a class to me!

Add Class

Step 1) Add HTML:

Add a class name to the div element with id="myDIV" (in this example we use a button to add the class).

Example

<button onclick="myFunction()">Try it</button><div id="myDIV"> This is a DIV element.</div>
Step 2) Add CSS:

Style the specified class name:

Example

.mystyle { width: 100%; padding: 25px; background-color: coral; color: white; font-size: 25px;}
Step 3) Add JavaScript:

Get the <div> element with id="myDIV" and add the "mystyle" class to it:

Example

function myFunction() { var element = document.getElementById("myDIV"); element.classList.add("mystyle");} Try it Yourself »

Tip: Also see How To Toggle A Class.

Tip: Also see How To Remove A Class.

Tip: Learn more about the classList property in our JavaScript Reference.

Tip: Learn more about the className property in our JavaScript Reference.

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