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

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
deltaY
31
12
17
9
IE9 supports an old draft of the spec where this value was a long instead of a double.
18
8
≤37
31
17
18
8
2.0

See also

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https://developer.mozilla.org/en-US/docs/Web/API/WheelEvent/deltaY