# Radio Group

A set of mutually exclusive options presented as radio buttons.

## Installation

Start from a Svelte 5 application, then install the component package, shared theme, and Bits UI peer:

```bash
pnpm add coss-svelte @coss-svelte/theme bits-ui
```

Import `@coss-svelte/theme/style-coss.css` after Tailwind from the application's global stylesheet.

## Usage

```svelte
<script lang="ts">
import { RadioGroup, RadioGroupItem } from "coss-svelte";
</script>

<RadioGroup value="next">
	<RadioGroupItem value="next">Next.js</RadioGroupItem>
	<RadioGroupItem value="vite">Vite</RadioGroupItem>
	<RadioGroupItem value="astro">Astro</RadioGroupItem>
</RadioGroup>

```

## Anatomy

- `RadioGroup`
- `RadioGroupItem`

## API Reference

### RadioGroup

A set of mutually exclusive options presented as radio buttons.

| Prop | Type | Default | Description |
| --- | --- | --- | --- |
| `bind:value` | `string` | `""` | Current value for the component. Bind with `bind:value` when supported. |
| `label` | `string` | `""` | Accessible label or fallback visible label for the control. |
| `options` | `Option[]` | `[]` | Options rendered by the component's built-in fallback composition. |
| `orientation` | `Orientation` | `"vertical"` | Layout direction for the component. |

**Composition and refs**

- `children: Snippet<[]>`
- `bind:ref: HTMLElement \| null`

Inherits from [Bits UI RadioGroup.Root](https://bits-ui.com/docs/components/radio-group#root).

### RadioGroupItem

Renders one item inside a toolbar group.

**Composition and refs**

- `children: Snippet<[RadioGroupItemSnippetProps]>`
- `bind:ref: HTMLElement \| null`

Inherits from [Bits UI RadioGroup.Item](https://bits-ui.com/docs/components/radio-group#item).

## Implementation Details

| Field | Value |
| --- | --- |
| Status | Stable |
| Foundation | bits |
| Category | Toggle & Choice |
| Particles | 6 |

## Status

Stable for the current coss-svelte surface.

## Agent Notes

- Import Svelte exports directly from `coss-svelte`.
- This is Svelte 5 code: use `class`, lowercase event properties, runes, snippets, and documented `bind:*` contracts. Do not emit JSX, React hooks, `className`, `asChild`, or Base UI imports.
- Prefer this route's example and generated API table over React COSS snippets; COSS React particles are design references only.
- The copy-and-own registry is a preview. Inspect `/r/radio-group.json` for the complete local file and dependency closure.
- Radio Group is stable in the current source catalog.