data-tables

Data Tables Are Where SaaS Products Are Won or Lost

Enterprise SaaS lives and dies by its data tables. The rules are non-negotiable.

Alignment Rules

Content Type	Alignment
Text	Left-align
Numbers	Right-align
Headers	Match content alignment
Data columns	Never center-align

Use monospace or tabular typography for numbers so "$1,111.11" doesn't visually outweigh "$999.99."

Pagination vs. Infinite Scroll

Pagination beats infinite scroll for SaaS data tables — always.

Nielsen Norman Group's research explains why: infinite scroll creates a "lack of landmarks." Users can't remember where items were. With pagination, users remember "it was on page 3, near the top."

Pogo-sticking — clicking into a record, then going back — is especially destructive with infinite scroll because users are often returned to the top of the list.

Pagination rules:

• Keep pages at 10–20 items
• Store pagination state in the URL
• Show total item count
• Preserve filters and sorting across pages

Two Table Types

Shopify Polaris makes a critical distinction:

DataTable (Static Comparison)

For showing values across categories with summary rows and fixed columns. Read-only comparison view.

IndexTable (Actionable Resource List)

For orders, customers, products — with row selection, bulk actions, and navigation to detail pages.

Build both patterns. The choice depends on whether users need to act on the data or compare it.

Column Defaults

Invest heavily in choosing which columns appear by default. Most users never customize.

Rules:

• Allow users to show, hide, reorder, and resize columns
• Always provide a prominent "Reset to defaults" button
• Good defaults mean most users never need to customize

Bulk Actions

Show a toolbar when one or more rows are selected.

Placement options:

• Replace the header row
• Float at the bottom of the viewport

Selection options:

• Support both "select all on this page" and "select all across all pages" as separate options
• On mobile screens below 490px, hide bulk actions unless essential — convert tables to card layouts instead

Examples

Working implementations in examples/:

• examples/responsive-data-table.md — Alignment CSS, URL-based pagination, bulk selection, and table-to-card mobile conversion

Review Checklist

When reviewing or building data tables:

• Text is left-aligned, numbers are right-aligned
• Headers match their content alignment
• No center-aligned data columns
• Numbers use monospace or tabular typography
• Pagination used instead of infinite scroll
• Pages contain 10–20 items
• Pagination state stored in the URL
• Total item count displayed
• Filters and sorting preserved across pages
• Column defaults carefully chosen
• Users can show/hide/reorder/resize columns
• "Reset to defaults" button is prominent
• Bulk action toolbar appears on row selection
• "Select all on this page" and "select all across all pages" are separate options