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
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | 31 | 17.0 (17.0) | 9.0 [1] | 18 | Not supported |
| Feature | Android | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | (Yes) | 17.0 (17.0) | ? | (Yes) | Not supported |
[1] IE9 supports an old draft of the spec where this value was a long instead of a double.