Hypertable

A full-featured data table mark. Drop any dimensions and measures onto the Columns tile on the Marks card and every field becomes a table column, bound to the worksheet so it travels with it.

Shared viz-extension techniques (reading encodings, live updates, the configure gear, selection → dashboard actions) live globally in reference/viz-extensions.md. This file covers only what's specific to Hypertable.

A data table is the one viz where internal vertical scrolling is correct, the pane never scrolls (toolbar, header, and totals footer stay fixed); only the row area scrolls, and it's row-virtualized so tens of thousands of rows stay smooth.

#Everything it does

• Multi-column sort, click a header to cycle desc → asc → off; Shift-click to add columns to the sort (priority numbers show the order).
• Search, instant substring filter across visible columns, with a live "N of M rows" count.
• Columns, drag to reorder, drag the right edge to resize, and a Columns popover to show/hide any field (and reset order).
• Per-type formatting, numbers right-aligned with tabular figures, abbreviation + decimals (configurable); dates and text left-aligned; long text truncates with a hover tooltip.
• In-cell visuals, data bars and/or heat background on measure cells (share of the column's range), configurable.
• Totals footer, sticky bottom row with sum / avg / min / max / count per measure (recomputes over the filtered view).
• Frozen first column (optional), zebra striping, gridlines, and compact / comfortable density.
• Row selection → dashboard actions, click to select (Ctrl/Cmd to toggle, Shift for a range); the matching worksheet marks are selected so filter/highlight actions fire.
• CSV export of the current (filtered + sorted) view.
• Safety cap at 50,000 rows with an on-screen note (never silently truncates).

#Encodings (Marks card)

For row selection to filter the dashboard, include at least one dimension (it identifies the marks). A measures-only table still renders; it just can't push a selection.

#Configure (the ⚙ gear, top-right)

Density, measure-cell style (plain / bars / heat / both), striping, gridlines, freeze first column, search box, decimals, abbreviate large numbers, totals row + aggregation, and the dashboard-interaction toggle. All persisted in the workbook.

#Run it locally

From the repo root: python scripts/kitserve.py (serves every extension on 8765). It answers on both IPv4 and IPv6 and resolves lib/ to _shared/lib; a plain python -m http.server does neither, which is what makes a local extension load as a blank or errored zone.

In Tableau, on a worksheet’s Marks card → mark-type dropdown → Add Extension… → Access Local Extensions → hypertable/manifest.local.trex. Drag a few fields onto Columns (try Sample - Superstore: Order ID, Customer Name, Category, Sales, Profit, Order Date).

Reload after .html/.js/.css edits (right-click → Reload). For any .trex change, remove and re-add the extension.

#Get it

Hypertable ships in the Extension Kit ($59). See it live on the demo gallery.