HTML DOM Element classList

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Example

Add a "myStyle" class to an element:

const list = element.classList;
list.add("myStyle");

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Remove the "myStyle" class from an element:

const list = element.classList;
list.remove("myStyle");

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Toggle "myStyle" on and off:

const list = element.classList;
list.toggle("myStyle");

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More examples below.

Definition and Usage

The classList property returns the CSS classnames of an element.

The classList property returns a DOMTokenList.

Syntax

element.classList

Return Value

Type	Description
Object	A DOMTokenList. A list of the class names of an element.

Note

The classList property is read-only, but you can use the methods listed below, to add, toggle or remove CSS classes from the list:

classList Properties and Methods

Name	Description
add()	Adds one or more tokens to the list
contains()	Returns true if the list contains a class
entries()	Returns an Iterator with key/value pairs from the list
forEach()	Executes a callback function for each token in the list
item()	Returns the token at a specified index
keys()	Returns an Iterator with the keys in the list
length	Returns the number of tokens in the list
remove()	Removes one or more tokens from the list
replace()	Replaces a token in the list
supports()	Returns true if a token is one of an attribute's supported tokens
toggle()	Toggles between tokens in the list
value	Returns the token list as a string
values()	Returns an Iterator with the values in the list

More Examples

Add multiple classes to the an element:

element.classList.add("myStyle", "anotherClass", "thirdClass");

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Remove multiple classes from an element:

element.classList.remove("myStyle", "anotherClass", "thirdClass");

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How many class names the element have:

let numb = element.classList.length;

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Get the class names of the "myDIV" element:

<div id="myDIV" class="myStyle anotherClass thirdClass">
<p>I am myDIV.</p>
</div>

const list = document.getElementById("myDIV").classList;

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Get the first class of an element:

let className = element.classList.item(0);

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Does an an element has a "myStyle" class?

let x = element.classList.contains("myStyle");

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Remove "anotherClass" if an element has a "myStyle" class.

if (element.classList.contains("mystyle")) {
element.classList.remove("anotherClass");
}

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Toggle between classes to create a dropdown button:

document.getElementById("myBtn").onclick = function() {myFunction()};

function myFunction() {
document.getElementById("myDropdown").classList.toggle("show");
}

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Create a sticky navigation bar:

// Get the navbar
const navbar = document.getElementById("navbar");

// Get the offset position of the navbar
const sticky = navbar.offsetTop;

// Add the sticky class to the navbar when you reach its scroll position
// Remove it when you leave the scroll position
function myFunction() {
if (window.pageYOffset >= sticky) {
navbar.classList.add("sticky")
} else {
navbar.classList.remove("sticky");
}
}

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CSS Tutorial: CSS Syntax

CSS Reference: CSS .class Selector