Web/API/WheelEvent/deltaMode

The WheelEvent.deltaMode read-only property returns an unsigned long representing the unit of the delta values scroll amount. Permitted values are:

Constant	Value	Description
DOM_DELTA_PIXEL	0x00	The delta values are specified in pixels.
DOM_DELTA_LINE	0x01	The delta values are specified in lines.
DOM_DELTA_PAGE	0x02	The delta values are specified in pages.

Syntax

var unit = event.deltaMode;

Example

var syntheticEvent = new WheelEvent("syntheticWheel", {"deltaX": 4, "deltaMode": 0});

console.log(syntheticEvent.deltaMode);

Specifications

Specification	Status	Comment
Document Object Model (DOM) Level 3 Events SpecificationThe definition of 'WheelEvent.deltaMode' in that specification.	Obsolete	Initial definition.

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

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
deltaMode	Chrome Full support 31	Edge Full support 12	Firefox Full support 17	IE Full support 9	Opera Full support 18	Safari Full support 6.1	WebView Android Full support Yes	Chrome Android Full support Yes	Firefox Android Full support 17	Opera Android Full support Yes	Safari iOS No support No	Samsung Internet Android Full support Yes

Legend

Full support  

Full support

No support  

No support

See also

• wheel
• WheelEvent

WheelEvent.deltaMode by Mozilla Contributors is licensed under CC-BY-SA 2.5.