# SegmentedControl

> Single-select segmented control: a compact, pill-shaped row of mutually exclusive options with one visibly selected, as a radiogroup with roving-tabindex arrow-key navigation. The selection indicator slides between options.

- Status: beta
- Group: form
- Page: https://www.digitaltableteur.com/design-system/components/segmented-control
- Contract: https://www.digitaltableteur.com/contracts/v1/SegmentedControl.contract.json

## When to use

SegmentedControl is the single-select counterpart to ButtonGroup: a compact row of mutually exclusive options with one visibly selected, for switching a small closed set of views or modes inline without opening a menu (list/grid, day/week/month). It is controlled; value + onValueChange own the selection. Keep it to 2-5 short segments; if the options do not fit on one line, use Select. Selecting must only change the bound value, never commit or route.

## When not to use

- Do not use it for actions or navigation that commits/routes; use `ButtonGroup` or links. Selecting must only change the bound value.
- Do not overflow it; if the options do not fit on one line, use `Select`.

## Look-alikes

- ButtonGroup: Do not use it for actions or navigation that commits/routes; use `ButtonGroup` or links. Selecting must only change the bound value.
- Select: Do not overflow it; if the options do not fit on one line, use `Select`.

## Props

| Prop | Type | Default | Description | Required |
| --- | --- | --- | --- | --- |
| `items` | `SegmentedControlItem[]` | none | Segments to render, in order. | Yes |
| `value` | `string` | none | Currently selected value (controlled). | Yes |
| `onValueChange` | `(value: string) => void` | none | Called with the new value when a segment is selected. | Yes |
| `size` | `"sm" \| "md" \| "lg"` | `md` | Size token. | No |
| `ariaLabel` | `string` | none | Accessible name for the group (required; announced by screen readers). | Yes |
| `className` | `string` | none | Additional CSS class names. | No |

## Variants

- Available sizes: `sm`, `md`, `lg` (default `md`).

## Invalid combinations

The contract records no invalid combinations.

## Keyboard

| Key | Behaviour |
| --- | --- |
| Tab | Moves focus to the selected segment (roving tabindex) |
| Arrow Left/Up and Right/Down | Move selection to the previous/next enabled segment. |
| Home/End | Select the first/last enabled segment. |

## Rules

Every item under When not to use is a MUST NOT. MUST and SHOULD follow RFC 2119.

| Level | Rule | How it is checked |
| --- | --- | --- |
| MUST | ARIA: Container is role=radiogroup with a required aria-label. | Not yet verified: no evidence record. WCAG 4.1.2. |
| MUST | ARIA: Each segment is role=radio with aria-checked reflecting selection. | Not yet verified: no evidence record. WCAG 4.1.2. |
| MUST | ARIA: Disabled segments are skipped by keyboard navigation. | Not yet verified: no evidence record. WCAG 4.1.2. |
| MUST | Required stories produce no axe violations at the configured severity. | Automated by `npm run test:stories:matrix:ci`. WCAG 2.5.8. |
| MUST | The accessibility tree (role, name, state) matches the committed snapshot for every required story. | Automated by `npm run test:stories:matrix:ci`. WCAG 1.3.1, 4.1.2. |
| MUST | The component remains legible and operable under a real browser forced-colors: active pass. | Automated by `npm run test:stories:hc`. |
| MUST | Every documented keyboard interaction works as specified. | Not yet verified: no evidence record. WCAG 2.1.1, 2.1.2. |
| MUST | A human completed an end-to-end accessibility review of this component. | Manual review, last on 2026-07-12. |

## Install and import

- Install: `npm install @digitaltableteur/react` (version 0.9.1, restricted access on npm).
- Import: `import { SegmentedControl } from "@digitaltableteur/react";`
- Entry point: `@digitaltableteur/react/navigation` exports it too.
- Styles: import `@digitaltableteur/react/style.css` once at the app boundary.
- Also available as the custom element `<dt-segmented-control>`; see the custom elements manifest.

## Links

- Machine-readable contract (Design System Contract 1.0): https://www.digitaltableteur.com/contracts/v1/SegmentedControl.contract.json
- Markdown version of this page: https://www.digitaltableteur.com/design-system/components/segmented-control.md
- Component index as JSON: https://www.digitaltableteur.com/design-system/components.json
- All components: https://www.digitaltableteur.com/design-system/components
- Source: The implementation lives in a private repository. This page, its Markdown twin and the contract are generated from it at build time and are the public source of truth.