API REFERENCE

viewportDatasource

Viewport model supplying data for visible row ranges. Implement initialization, range changes, and cleanup.

What does this API do?

Viewport model supplying data for visible row ranges. Implement initialization, range changes, and cleanup.

API for Pro features: Viewport row model

Exact input and result types

typescript

viewportDatasource: ViewportDatasource<GridRow>

Item	Value
JavaScript name	viewportDatasource
HTML attribute	viewport-datasource
Default	undefined
Input type	ViewportDatasource<GridRow>

Usage flow

Set this on a property of the Grid element. Pass arrays, objects, and callbacks through JavaScript, and use new arrays or objects when applying changes.

Read related types

ViewportDatasource
GridRow

Feature explanations and examples

Stream the visible range
This suits price feeds and monitoring views where the total count is known but only visible rows need continuous updates. Adjusting the subscription to the scroll range is essential.