WheelEvent: deltaMode property

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.

Value

An unsigned long.

Examples

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

console.log(syntheticEvent.deltaMode);

Specifications

Specification
UI Events
# dom-wheelevent-deltamode

Browser compatibility

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See also