Web/API/GlobalEventHandlers/onscroll

The onscroll property of the GlobalEventHandlers mixin is an EventHandler that processes scroll events.

The scroll event fires when the document view or an element has been scrolled, whether by the user, a Web API, or the user agent.

Note: Don't confuse onscroll with onwheel!

onwheel handles general wheel rotation, while onscroll handles scrolling of an object's content.

Syntax

target.onscroll = functionRef

Value

functionRef: A function name, or a function expression. The function receives a UIEvent object as its sole argument.

Only one onscroll handler can be assigned to an object at a time.

For greater flexibility, you can pass a scroll event to the EventTarget.addEventListener() method instead.

Example

This example monitors scrolling on a <textarea>, and logs the element's vertical scroll position accordingly.

HTML

<textarea>1 2 3 4 5 6 7 8 9</textarea>
<p id="log"></p>

CSS

textarea {
  width: 4rem;
  height: 8rem;
  font-size: 3rem;
}

JavaScript

const textarea = document.querySelector('textarea');
const log = document.getElementById('log');

textarea.onscroll = logScroll;

function logScroll(e) {
  log.textContent = `Scroll position: ${e.target.scrollTop}`;
}

Result

Specifications

Specification	Status	Comment
HTML Living StandardThe definition of 'onscroll' in that specification.	Living Standard
Document Object Model (DOM) Level 3 Events SpecificationThe definition of 'onscroll' in that specification.	Obsolete	Initial definition

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`onscroll`	Chrome Full support Yes	Edge Full support ≤18	Firefox Full support Yes	IE ?	Opera ?	Safari ?	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support Yes	Opera Android ?	Safari iOS ?	Samsung Internet Android Full support Yes

Legend

Full support: Full support
Compatibility unknown: Compatibility unknown