WheelEvent.deltaY

The WheelEvent.deltaY read-only property is a double representing the vertical scroll amount in the WheelEvent.deltaMode unit.

Syntax

var dY = event.deltaY;

Example

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

console.log(syntheticEvent.deltaY);

Specifications

Specification	Status	Comment
Document Object Model (DOM) Level 3 Events Specification The definition of 'WheelEvent.deltaY' in that specification.	Working Draft	Initial definition.

Browser compatibility

[1] IE9 supports an old draft of the spec where this value was a long instead of a double.

See also

• wheel
• WheelEvent