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title WheelEvent
slug Web/API/WheelEvent
page-type web-api-interface
browser-compat api.WheelEvent

{{APIRef("Pointer Events")}}

The WheelEvent interface represents events that occur due to the user moving a mouse wheel or similar input device.

Note

This is the standard wheel event interface to use. Old versions of browsers implemented the non-standard and non-cross-browser-compatible MouseWheelEvent and {{DOMxRef("MouseScrollEvent")}} interfaces. Use this interface and avoid the non-standard ones.

Don't confuse the wheel event with the {{domxref("Element/scroll_event", "scroll")}} event:

  • A wheel event doesn't necessarily dispatch a scroll event. For example, the element may be unscrollable at all. Zooming actions using the wheel or trackpad also fire wheel events.
  • A scroll event isn't necessarily triggered by a wheel event. Elements can also be scrolled by using the keyboard, dragging a scrollbar, or using JavaScript.
  • Even when the wheel event does trigger scrolling, the delta* values in the wheel event don't necessarily reflect the content's scrolling direction.

{{InheritanceDiagram}}

Constructor

  • {{DOMxRef("WheelEvent.WheelEvent", "WheelEvent()")}}
    • : Creates a WheelEvent object.

Instance properties

This interface inherits properties from its ancestors, {{DOMxRef("MouseEvent")}}, {{DOMxRef("UIEvent")}}, and {{DOMxRef("Event")}}.

  • {{DOMxRef("WheelEvent.deltaX")}} {{ReadOnlyInline}}
    • : Returns a double representing the horizontal scroll amount.
  • {{DOMxRef("WheelEvent.deltaY")}} {{ReadOnlyInline}}
    • : Returns a double representing the vertical scroll amount.
  • {{DOMxRef("WheelEvent.deltaZ")}} {{ReadOnlyInline}}
    • : Returns a double representing the scroll amount for the z-axis.
  • {{DOMxRef("WheelEvent.deltaMode")}} {{ReadOnlyInline}}
    • : Returns an unsigned long representing the unit of the delta* values' scroll amount.
  • {{DOMxRef("WheelEvent.wheelDelta")}} {{ReadOnlyInline}} {{Deprecated_Inline}} {{Non-standard_Inline}}
    • : Returns an integer (32-bit) representing the distance in pixels.
  • {{DOMxRef("WheelEvent.wheelDeltaX")}} {{ReadOnlyInline}} {{Deprecated_Inline}} {{Non-standard_Inline}}
    • : Returns an integer representing the horizontal scroll amount.
  • {{DOMxRef("WheelEvent.wheelDeltaY")}} {{ReadOnlyInline}} {{Deprecated_Inline}} {{Non-standard_Inline}}
    • : Returns an integer representing the vertical scroll amount.

Note

Element: mousewheel event has additional documentation about the deprecated properties wheelDelta, wheelDeltaX, wheelDeltaY.

Instance methods

This interface doesn't define any specific methods, but inherits methods from its ancestors, {{DOMxRef("MouseEvent")}}, {{DOMxRef("UIEvent")}}, and {{DOMxRef("Event")}}.

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

  • {{domxref("Element/wheel_event", "wheel")}} event
  • Interfaces replaced by this one:
    • Gecko's legacy mouse wheel event object: {{DOMxRef("MouseScrollEvent")}}