DiagramZoomStartEvent

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Updated on Apr 2, 2026

The event arguments for the zoomStart event of the Diagram. This event is triggered before the zoom level changes.

Name	Type	Default	Description
isDefaultPrevented	() => boolean		Checks if the default action of the event has been prevented.
meta?	any		Additional metadata associated with the event.
nativeEvent?	MouseEvent | PointerEvent | TouchEvent | WheelEvent		The native event that triggered the diagram event.
point	Point		The point where the event occurred, in diagram coordinates.
preventDefault	() => void		Prevents the default action of the event.
zoom	number		The Diagram's zoom.