# Row numbers

> Add a spreadsheet-style row-number column that follows sorting and filtering and is announced by screen readers.

`rowNumbers` adds a leading column that numbers the rows 1, 2, 3…, as in a spreadsheet. The numbers are positions in the current view, not ids, so they follow sorting and filtering.

Sort any column: the rows move and the numbers stay in order.

Example: Row numbers (row-numbers.svelte)

```svelte
<script lang="ts">
  import { Grid, type ColumnDef } from 'bo-grid';
  import { quotes } from './data';

  const columns: ColumnDef[] = [
    { type: 'text', key: 'symbol', header: 'Symbol', width: 100 },
    { type: 'text', key: 'name', header: 'Company', width: 150 },
    { type: 'price', key: 'price', header: 'Price', width: 96 },
    { type: 'percent', key: 'change', header: 'Chg %', width: 96 },
    { type: 'text', key: 'sector', header: 'Sector', flex: 1 },
  ];

  let rows = $state(quotes());
</script>

<!-- The numbers follow the view: sort a column and they stay 1, 2, 3… -->
<Grid {rows} {columns} rowNumbers height={280} />
```

data.ts:

```ts
// Small, fixed data for the docs' examples: every example reads the same
// symbols, so a reader compares features, not datasets.
// A type, not an interface: it then fits GridRow's index signature.
export type Quote = {
  id: number;
  symbol: string;
  name: string;
  sector: string;
  price: number;
  change: number;
  volume: number;
};

const BASE: Omit<Quote, 'id'>[] = [
  { symbol: 'VNM', name: 'Vinamilk', sector: 'Consumer', price: 68.5, change: 1.2, volume: 1_204_000 },
  { symbol: 'FPT', name: 'FPT Corp', sector: 'Technology', price: 132, change: -0.4, volume: 860_500 },
  { symbol: 'HPG', name: 'Hoa Phat', sector: 'Materials', price: 27.35, change: 0.74, volume: 3_412_900 },
  { symbol: 'VCB', name: 'Vietcombank', sector: 'Financials', price: 91.5, change: 0.55, volume: 1_986_200 },
  { symbol: 'MWG', name: 'Mobile World', sector: 'Consumer', price: 51.4, change: -1.1, volume: 2_250_400 },
  { symbol: 'SSI', name: 'SSI Securities', sector: 'Financials', price: 33.3, change: -0.45, volume: 4_104_700 },
  { symbol: 'VIC', name: 'Vingroup', sector: 'Real estate', price: 44.15, change: -0.11, volume: 1_530_100 },
  { symbol: 'GAS', name: 'PV Gas', sector: 'Energy', price: 71.8, change: 0.3, volume: 645_800 },
  { symbol: 'MSN', name: 'Masan', sector: 'Consumer', price: 76.2, change: 2.05, volume: 1_120_300 },
  { symbol: 'TCB', name: 'Techcombank', sector: 'Financials', price: 23.9, change: 0.84, volume: 5_870_000 },
  { symbol: 'VHM', name: 'Vinhomes', sector: 'Real estate', price: 41.6, change: -0.72, volume: 2_904_600 },
  { symbol: 'POW', name: 'PV Power', sector: 'Energy', price: 12.25, change: 1.66, volume: 6_315_200 },
];

/** A fresh copy of the quotes, so one example's edits never reach another. */
export function quotes(): Quote[] {
  return BASE.map((q, i) => ({ id: i + 1, ...q }));
}
```

## Turning it on

```svelte
<Grid {rows} {columns} rowNumbers height={480} />
```

- Data rows are numbered; group header rows get no number.
- The column stays in place when the grid scrolls sideways, and it is sized to the widest number.
- Its cells are row headers, so a screen reader announces the row's number with each cell. The column's header reads "Row", the `rowNumber` entry in [`labels`](https://bonguynvan.github.io/bo-grid/docs/localization/).

## Reference

- `rowNumbers`: `boolean` (default `false`) — A leading row-number column (1, 2, 3… in view order; data rows only), as in a spreadsheet. Its cells are row headers, so screen readers announce the number with each row.
- `labels`: `Partial<GridLabels>` (default `{}`) — Override any string the grid renders itself (menus, filter editor, pager, aria labels). Merged over English defaults — pass only what changes. Interpolated entries are functions so translations can reorder the parts. Resolved per grid.

  ```svelte
  <Grid {rows} {columns} height={480} labels={{ noRows: 'Không có dữ liệu', sortAscending: 'Tăng dần' }} />
  ```

---
Page: https://bonguynvan.github.io/bo-grid/docs/row-numbers/ · All pages: https://bonguynvan.github.io/bo-grid/llms.txt