Interface: WheelOptions

Defined in: dom/src/pointer/wheel.ts:1

Properties

onWheel

onWheel: (event) => void;

Defined in: dom/src/pointer/wheel.ts:7

Called for every wheel event that requireFocus lets through. The listener is not passive, so this may call preventDefault() to keep the page from scrolling.

Parameters

Parameter	Type
event	WheelEvent

Returns

void

---

requireFocus?

optional requireFocus?: boolean;

Defined in: dom/src/pointer/wheel.ts:21

Only report events while the focus is inside the element.

A control that reacts to the wheel on hover alone takes the scroll away from the page, so passing over one in a long form silently changes its value. Requiring focus makes that an explicit act.

The check is contains, not an identity test: the element that actually takes focus is usually a descendant, such as a thumb or an <input>, and a caller may have replaced it with markup of their own.

Default

false