HTML DOM classList Property
Example
Add the "mystyle" class to a <div> element:
document.getElementById("myDIV").classList.add("mystyle");
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More "Try it Yourself" examples below.
Definition and Usage
The classList property returns the class name(s) of an element, as a DOMTokenList object.
This property is useful to add, remove and toggle CSS classes on an element.
The classList property is read-only, however, you can modify it by using the add() and remove() methods.
Cross-browser solution: The classList property is not supported in IE9 and earlier. However, you can use the className property or regular expressions for a cross-browser solution (see "More Examples" on the bottom of this page).
Browser Support
The numbers in the table specify the first browser version that fully supports the property.
| Property | |||||
|---|---|---|---|---|---|
| classList | 8.0 | 10.0 | 3.6 | 5.1 | 11.5 |
Syntax
element.classList
Properties
| Property | Description |
|---|---|
| length | Returns the number of classes in the list. This property is read-only |
Methods
| Method | Description |
|---|---|
| add(class1, class2, ...) | Adds one or more class names to an element. If the specified class already exist, the class will not be added |
| contains(class) |
Returns a Boolean value, indicating whether an element has the
specified class name.
Possible values:
|
| item(index) | Returns the class name with a specified index number from an
element. Index starts at 0. Returns null if the index is out of range |
| remove(class1, class2, ...) | Removes one or more class names from an element. Note: Removing a class that does not exist, does NOT throw an error |
| toggle(class, true|false) | Toggles between a class name for an element. The first parameter removes the specified class from an element, and returns false. If the class does not exist, it is added to the element, and the return value is true. The optional second parameter is a Boolean value that forces the class to be added or removed, regardless of whether or not it already existed. For example: Remove a class: element.classList.toggle("classToRemove", false); Add a class: element.classList.toggle("classToAdd", true); Note: The second parameter is not supported in Internet Explorer or Opera 12 and earlier. |
Technical Details
| Return Value: | A DOMTokenList, containing a list of the class name(s) of an element |
|---|
More Examples
Example
Add multiple classes to a <div> element:
document.getElementById("myDIV").classList.add("mystyle",
"anotherClass", "thirdClass");
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Example
Remove a class from a <div> element:
document.getElementById("myDIV").classList.remove("mystyle");
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Example
Remove multiple classes from a <div> element:
document.getElementById("myDIV").classList.remove("mystyle",
"anotherClass", "thirdClass");
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Example
Toggle between two classes for a <div> element:
document.getElementById("myDIV").classList.toggle("newClassName");
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Example
Get the class name(s) of a <div> element:
<div id="myDIV" class="mystyle
anotherClass thirdClass">I am a DIV element</div>
var x = document.getElementById("myDIV").classList;
The result of x will be:
mystyle
anotherClass thirdClass
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Example
Find out how many class names a <div> element has:
var x = document.getElementById("myDIV").classList.length;
The result of x will be:
3
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Example
Get the first class name (index 0) of a <div> element:
var x = document.getElementById("myDIV").classList.item(0);
The result of x will be:
mystyle
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Example
Find out if an element has a "mystyle" class:
var x = document.getElementById("myDIV").classList.contains("mystyle");
The result of x will be:
true
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Example
Find out if an element has a "mystyle" class. If so, remove another class name:
var x = document.getElementById("myDIV");
if
(x.classList.contains("mystyle")) {
x.classList.remove("anotherClass");
} else {
alert("Could not find it.");
}
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Example
Toggle between classes to create a dropdown button:
// Get the button, and when the user clicks on it, execute myFunction
document.getElementById("myBtn").onclick = function() {myFunction()};
/* myFunction toggles between adding and removing the show class, which
is used to hide and show the dropdown content */
function myFunction() {
document.getElementById("myDropdown").classList.toggle("show");
}
// Close the dropdown if the user clicks outside of it
window.onclick =
function(event) {
if (!event.target.matches('.dropbtn')) {
var dropdowns = document.getElementsByClassName("dropdown-content");
var i;
for (i = 0; i < dropdowns.length; i++) {
var openDropdown = dropdowns[i];
if (openDropdown.classList.contains('show'))
{
openDropdown.classList.remove('show');
}
}
}
}
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Fallback Example: add
A cross-browser solution when using the classList.add() method, for IE9 and earlier:
var x = document.getElementById("myDIV");
if (x.classList) {
x.classList.add("mystyle");
} else {
x.className
= "mystyle"; // For IE9 and earlier
}
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Fallback Example: remove
A cross-browser solution when using the classList.remove() method, for IE9 and earlier:
var x = document.getElementById("myDIV");
if (x.classList) {
x.classList.remove("mystyle");
} else {
x.className = x.className.replace(/\bmystyle/g, ""); // For IE9
and earlier
}
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Fallback Example: contains
A cross-browser solution when using the classList.contains() method, for IE9 and earlier:
var x = document.getElementById("myDIV");
if (x.classList)
{
alert(x.classList.contains("mystyle"));
} else {
alert(/\bmystyle/g.test(x.className)); // For IE9 and earlier
}
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Fallback Example: toggle
A cross-browser solution when using the classList.toggle() method, for IE9:
var x = document.getElementById("myDIV");
if (x.classList) {
x.classList.toggle("mystyle");
} else {
// For IE9
var classes = x.className.split(" ");
var i =
classes.indexOf("mystyle");
if (i >= 0)
classes.splice(i, 1);
else
classes.push("mystyle");
x.className = classes.join(" ");
}
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Related Pages
CSS Tutorial: CSS Selectors
CSS Reference: CSS .class Selector
HTML DOM Reference: HTML DOM className Property
HTML DOM Reference: HTML DOM getElementsByClassName() Method
HTML DOM Reference: HTML DOM Style Object
Element Object
