0.1.0 - 2026-09-08

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First public release of JH Grid - a high-performance Canvas-based data grid built for large datasets. Renders millions of rows and columns with near-zero DOM overhead.

Highlights

Performance

• 2D virtual scrolling - only visible cells are ever drawn, smooth even at 1,000,000+ rows
• Rendering synced to your display’s native refresh rate (60Hz/120Hz/144Hz) via requestAnimationFrame + Canvas 2D, not capped at 60fps
• Chunk-based async data loading with prefetch & LRU cache
• HiDPI / Retina display support

Editing & Interaction

• Cell / range selection, drag-fill, row selection (single/multi) with select-all header checkbox
• Double-click to edit, per-column editable/readonly control
• Copy/paste (Ctrl+C/V, TSV format), undo/redo (Ctrl+Z/Y)
• Row drag reorder, row/column CRUD with diff-friendly accessors
• Date / rich-text / image cell types, plus a pluggable CellEditors / CellRenderers registry for custom types
• Declarative column validation (required/pattern/min/max/length/custom) with inline error display
• In-cell action buttons (type: 'button')

Filtering, Sorting & Layout

• Per-column set filter + global quick filter
• Single-column sort
• Multi-level header groups, frozen columns (left/right)
• Column hide/show, resize, auto-fit

Theming & Accessibility

• Fully themeable via a single theme object + --jhg-* CSS custom properties
• ARIA labeling, keyboard-navigable header/row focus, automatic high-contrast (forced-colors) support
• Built-in localization (KO_I18N / JA_I18N / ZH_I18N) with per-key overrides and locale-aware number/date/currency formatting

Other

• getState() / setState() for saving and restoring grid state
• CSV export + print preview
• Zero dependencies

Browser Support

Chrome/Edge 92+, Firefox 90+, Safari 15.4+. No IE, no legacy Edge, no transpilation or polyfills. See docs/browser-support.md.

Installation

npm package coming soon - for now, use the static ES module or CDN build. See the README for both options.

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