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    This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

    This feature has been removed from the Web standards. Though some browsers may still support it, it is in the process of being dropped. Do not use it in old or new projects. Pages or Web apps using it may break at any time.

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

    Do not use this interface for wheel events.

    Like MouseWheelEvent, this interface is non-standard and deprecated. It was used in Gecko-based browsers only. Instead use the standard WheelEvent.

    Method overview

    void initMouseScrollEvent(in DOMString typeArg, in boolean canBubbleArg, in boolean cancelableArg, in nsIDOMAbstractView viewArg, in long detailArg, in long screenXArg, in long screenYArg, in long clientXArg, in long clientYArg, in boolean ctrlKeyArg, in boolean altKeyArg, in boolean shiftKeyArg, in boolean metaKeyArg, in unsigned short buttonArg, in nsIDOMEventTarget relatedTargetArg, in long axis);


    Attribute Type Description
    axis long Indicates scroll direction. Read only.


    Delta modes

    Constant Value Description
    HORIZONTAL_AXIS 0x01 The event is caused by horizontal wheel operation.
    VERTICAL_AXIS 0x02 The event is caused by vertical wheel operation.



    See nsIDOMMouseScrollEvent::initMouseScrollEvent().

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
    Basic support Not supported 3.5 (1.9.1) Not supported Not supported Not supported
    Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
    Basic support Not supported 1.0 (1.9.1) Not supported Not supported Not supported

    See also

    Document Tags and Contributors

    Contributors to this page: Sheppy, fscholz, teoli, Masayuki, rpp2119, kscarfone
    Last updated by: fscholz,