The wheel event fires when the user rotates a wheel button on a pointing device (typically a mouse).

This event replaces the non-standard deprecated mousewheel event.

Bubbles Yes
Cancelable Yes
Interface WheelEvent
Event handler property onwheel

Note: Don't confuse the wheel event with the scroll event. The default action of a wheel event is implementation-specific, and doesn't necessarily dispatch a scroll event. Even when it does, the delta* values in the wheel event don't necessarily reflect the content's scrolling direction. Therefore, do not rely on the wheel event's delta* properties to get the scrolling direction. Instead, detect value changes of scrollLeft and scrollTop in the scroll event.

Examples

Scaling an element via the wheel

This example shows how to scale an element using the mouse (or other pointing device) wheel.

<div>Scale me with your mouse wheel.</div>
body {
  min-height: 100vh;
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

div {
  width: 105px;
  height: 105px;
  background: #cdf;
  padding: 5px;
}
function zoom(event) {
  event.preventDefault();

  scale += event.deltaY * -0.01;

  // Restrict scale
  scale = Math.min(Math.max(.125, scale), 4);

  // Apply scale transform
  el.style.transform = `scale(${scale})`;
}

let scale = 1;
const el = document.querySelector('div');
el.onwheel = zoom;

addEventListener equivalent

The event handler can also be set up using the addEventListener() method:

el.addEventListener('wheel', zoom);

Specifications

Specification Status Comment
UI Events
The definition of 'wheel' in that specification.
Working Draft  

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
wheel eventChrome Full support 61Edge Full support YesFirefox Full support YesIE Full support YesOpera Full support 48Safari Full support YesWebView Android Full support 61Chrome Android Full support 61Edge Mobile Full support YesFirefox Android Full support YesOpera Android Full support 45Safari iOS Full support YesSamsung Internet Android ?

Legend

Full support  
Full support
Compatibility unknown  
Compatibility unknown

See also