Handling Dynamic Row Heights in Virtualized Tables
Provide a code example to illustrate the approach for handling dynamic row heights in a virtualized table using TanStack Virtual, ensuring rows with variable content sizes are correctly measured and rendered.
const tableContainerRef = useRef(null);
Creates a React ref to attach to the table container. This ref is used to get the scrollable element for the virtualizer.
const { rows, newInvoiceIds } = useYourDataFetchingLogic();
Fetches the data for the rows in the table and any state or IDs you might need for your logic. Replace 'useYourDataFetchingLogic' with your actual data fetching hook.
const rowVirtualizer = useVirtualizer({
count: rows.length,
estimateSize: () => 33,
getScrollElement: () => tableContainerRef.current,
measureElement: typeof window !== 'undefined' && navigator.userAgent.indexOf('Firefox') === -1 ? (element) => element?.getBoundingClientRect().height : undefined,
overscan: 5,
});
Initializes the row virtualizer with TanStack Virtual. 'estimateSize' provides an initial estimate for row heights. 'measureElement' dynamically measures row heights except in Firefox due to a specific measurement issue.
{rowVirtualizer.getVirtualItems().map((virtualRow) => {
const row = rows[virtualRow.index];
return (
<InvoiceTableRow
row={row}
isNewRow={newInvoiceIds.includes(row.original.invoiceId)}
isSelectedRow={row.getIsSelected()}
key={virtualRow.key}
style={{
top: 0,
left: 0,
width: '100%',
position: 'absolute',
transform: `translateY(${virtualRow.start}px)`,
}}
/>
);
})}
Renders the virtual rows using map over 'getVirtualItems'. Each row is positioned absolutely within the container using a transform that leverages the 'start' value provided by the virtualizer. Ensure each row component like 'InvoiceTableRow' is optimized and renders its children efficiently.