React table pinned summary and total rows

▶ Try it live: open a Mantine starter in StackBlitz — compose pinnedSummaryRows. Other UI kits →

▶ See it working: pinned summaries and group totals in Mantine — host-owned totals stick above and below the list, and they are not data rows. The same page exists for MUI, Chakra, antd, Radix, Base UI, shadcn and Tailwind.

These are not lifted data rows. You pass separate objects (pinnedRows: { top, bottom }) that never enter sort, filter, grouping, pagination or selection. Cells still run through the ordinary column pipeline — formatters, sparklines, spanning — and the rows stick above or below the scroll window, including on grouped and tree tables where lift-a-data-row pinning stays refused.

import { DataTable } from "@adapttable/mantine";
import { pinnedSummaryRows } from "@adapttable/mantine/pinned-summary-rows";

const totals = { id: "totals", name: "Team total", budget: 128_000 };

<DataTable
  data={rows}
  columns={columns}
  rowKey={(row) => row.id}
  features={[
    pinnedSummaryRows({
      top: [totals],
      bottom: [{ id: "grand", name: "Grand total", budget: 128_000 }],
    }),
  ]}
/>;

The objects are host data. Nothing is written to the URL or a Saved View — a shared link does not have to invent totals the next load cannot recompute. They are not exported, selected, edited, reordered, or given pin / row-action menus.

Desktop rows use data-adapttable-part="pinned-summary-top" / "pinned-summary-bottom" and aria-label from pinnedSummaryRow. Keyboard cell navigation reaches them. Mobile cards keep the same order and announcement; a card list has no sticky chrome.

Identities are namespaced (adapttable:pinned-summary:top:0) so they never collide with a data-row id.

Totals computed from rows — summaryRow and group aggregates — are on the aggregation page. Lift a real person with rowPinning. Stick a total that is not in the dataset with this factory.

Labels: pinnedSummaryRow, pinnedSummaryTop, pinnedSummaryBottom.

Headless, from @adapttable/core: PinnedRows is the { top, bottom } shape and PinnedSummaryEntry one resolved row; resolvePinnedRows, pinnedSummaryEntries and allPinnedSummaryEntries flatten them into keyed entries. pinnedSummaryRowId(side, index) builds the namespaced id, isPinnedSummaryRowId(id) and pinnedSummarySideFromId(id) read it back, and pinnedSummaryPart(side) names the row’s part (PINNED_SUMMARY_TOP_PART / PINNED_SUMMARY_BOTTOM_PART). The id and part helpers are also on @adapttable/react/adapter.