onMove

onMove is a generic event name used in software libraries to denote the moment or period when an input device or graphical element changes position. It is not a standardized protocol; rather, it is a convention adopted by multiple UI frameworks and toolkits to provide a callback or listener that responds to movement.

Usage commonly appears in interactive interfaces such as drag-and-drop, panning maps, or motion effects. In web development, libraries may expose an onMove-like callback to a component, while the underlying platform provides equivalent events such as pointermove, mousemove, or touchmove, depending on the input modality. In desktop or mobile frameworks, similar callbacks can occur during gesture tracking or animation updates.

Event data associated with an onMove handler typically includes coordinates of the pointer, such as x and y, and may also provide deltas since the last event, a timestamp, velocity, or position relative to a target element or the initial drag origin. The exact structure depends on the library or framework.

Variability is common: the signature, firing frequency, and semantics of onMove differ across implementations. Some invoke the handler continuously as movement occurs; others may throttle or debounce updates or trigger only after crossing thresholds. Accessibility considerations emphasize providing alternative input methods and ensuring that movement-based interactions remain operable without a pointing device.

See also: pointermove, mousemove, touchmove, drag events.