WheelEvent deltaZ Property

Return whether the user scrolls in or out (along the z-axis):

function myFunction(event) {
var z = event.deltaZ;
}

Description

The deltaZ property returns a positive value when scrolling in, and a negative value when scrolling out, otherwise 0.

Note: Most mouse devices do not have the ability to scroll along the z-axis, and will always return 0.

Note: This property is read-only.

event.deltaZ

Return Value:	A Double, indicating the scrolling direction of the mouse wheel

event.deltaZ is a DOM Level 4 (2015) feature.

It is supported in all modern browsers:


Chrome	Edge	Firefox	Safari	Opera
Yes	Yes	Yes	Yes	Yes

event.deltaZ is not supported in Internet Explorer 11 (or earlier).