HTML DOM Element getElementsByClassName()
Examples
Change the text of the first list item with class="child":
const list = document.getElementsByClassName("example")[0];
list.getElementsByClassName("child")[0].innerHTML = "Milk";
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Number of elements with class="child" in "myDIV":
const element = document.getElementById("myDIV");
const nodes = element.getElementsByClassName("child");
let number = nodes.length;
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Change the size of the second element with class="child":
const element = document.getElementById("myDIV");
element.getElementsByClassName("child")[1].style.fontSize = 24px";
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More examples below.
Definition and Usage
The getElementsByClassName() method returns a collection of
child elements with a given class name.
The getElementsByClassName() method returns a
NodeList object.
NodeList
A NodeList is an array-like collection (list) of nodes.
The nodes in the list can be accessed by index. The index starts at 0.
The length Poperty returns the number of nodes in the list.
Syntax
element.getElementsByClassName(classname)
Parameters
| Parameter | Description |
| classname | Required. The class name of the child elements. Separate multiple names with spaces ("child color"). |
Return Value
| Type | Description |
| NodeList | The elements' child elements with the given class name. The elements are sorted as they appear in the source code. |
More Examples
Change the size of the first element with "child" and "color" classes inside the second element with class="example":
const elements = document.getElementsByClassName("example")[1];
elements.getElementsByClassName("child color")[0].style.fontSize = "24px";
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Change the color of all elements in "myDIV" with class="child":
const element = document.getElementById("myDIV");
const nodes = element.getElementsByClassName("child");
for (let i = 0; i < nodes.length; i++) {
nodes[i].style.color = "red";
}
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Browser Support
element.getElementsByClassName() is a DOM Level 1 (1998) feature.
It is fully supported in all browsers:
| Chrome | IE | Edge | Firefox | Safari | Opera |
| Yes | 9-11 | Yes | Yes | Yes | Yes |
