---
layout: ~/layouts/MdxDocLayout.astro
title: "Radio"
description: "A control that allows the user to select one option from a set. Always used within a Radio.Group."
sourceFile: "components/radio"
baseUIComponent: "radio-group"
---

import ComponentExample from "~/components/docs/ComponentExample.astro";
import ComponentSection from "~/components/docs/ComponentSection.astro";
import CodeBlock from "~/components/docs/CodeBlock.astro";
import Heading from "~/components/docs/Heading.astro";
import PropsTable from "~/components/docs/PropsTable.astro";
import {
  RadioBasicDemo,
  RadioDefaultDemo,
  RadioHorizontalDemo,
  RadioDescriptionDemo,
  RadioErrorDemo,
  RadioDisabledDemo,
  RadioControlPositionDemo,
} from "~/components/demos/RadioDemo";

{/* Demo */}

<ComponentSection>
  <ComponentExample
    code={`<Radio.Group legend="Notification preference" defaultValue="email">
  <Radio.Item label="Email" value="email" />
  <Radio.Item label="SMS" value="sms" />
  <Radio.Item label="Push notification" value="push" />
</Radio.Group>`}
  >
    <RadioBasicDemo client:visible />
  </ComponentExample>
</ComponentSection>

{/* Installation */}

<ComponentSection>
  <Heading level={2}>Installation</Heading>
  <Heading level={3}>Barrel</Heading>
  <CodeBlock code={`import { Radio } from "@cloudflare/kumo";`} lang="tsx" />
  <Heading level={3}>Granular</Heading>
  <CodeBlock
    code={`import { Radio } from "@cloudflare/kumo/components/radio";`}
    lang="tsx"
  />
</ComponentSection>

{/* Usage */}

  <ComponentSection>
    <Heading level={2}>Usage</Heading>
    <CodeBlock
      code={`import { Radio } from "@cloudflare/kumo";

export default function Example() {
  return (
    <Radio.Group legend="Choose an option" defaultValue="a">
      <Radio.Item label="Option A" value="a" />
      <Radio.Item label="Option B" value="b" />
    </Radio.Group>
  );
}`}
      lang="tsx"
    />
  </ComponentSection>

{/* Examples */}

  <ComponentSection>
    <Heading level={2}>Examples</Heading>

    <Heading level={3}>Default (Vertical)</Heading>
    <p>
      Radio groups display vertically by default. Each radio has a label
      displayed to its right.
    </p>
    <ComponentExample
      code={`<Radio.Group legend="Account type" defaultValue="personal">

  <Radio.Item label="Personal" value="personal" />
  <Radio.Item label="Business" value="business" />
  <Radio.Item label="Enterprise" value="enterprise" />
</Radio.Group>`}
    >
      <RadioDefaultDemo client:visible />
    </ComponentExample>

    <Heading level={3}>Horizontal</Heading>
    <p>
      Use `orientation="horizontal"` for inline layouts. Items wrap when there isn't enough space.
    </p>
    <ComponentExample
      code={`<Radio.Group legend="Size" orientation="horizontal" defaultValue="md">

  <Radio.Item label="Small" value="sm" />
  <Radio.Item label="Medium" value="md" />
  <Radio.Item label="Large" value="lg" />
</Radio.Group>`}
    >
      <RadioHorizontalDemo client:visible />
    </ComponentExample>

    <Heading level={3}>With Description</Heading>
    <p>
      Add helper text below the radio items using the <code
        class="rounded bg-kumo-control px-1 py-0.5 text-sm">description</code> prop.
    </p>
    <ComponentExample
      code={`<Radio.Group

legend="Shipping method"
description="Choose how you'd like to receive your order"
defaultValue="standard"

>

  <Radio.Item label="Standard (5-7 days)" value="standard" />
  <Radio.Item label="Express (2-3 days)" value="express" />
  <Radio.Item label="Overnight" value="overnight" />
</Radio.Group>`}
    >
      <RadioDescriptionDemo client:visible />
    </ComponentExample>

    <Heading level={3}>With Error</Heading>
    <p>
      Show validation errors at the group level using the <code
        class="rounded bg-kumo-control px-1 py-0.5 text-sm">error</code> prop.
    </p>
    <ComponentExample
      code={`<Radio.Group

legend="Payment method"
error="Please select a payment method to continue"

>

  <Radio.Item label="Credit Card" value="card" variant="error" />
  <Radio.Item label="PayPal" value="paypal" variant="error" />
  <Radio.Item label="Bank Transfer" value="bank" variant="error" />
</Radio.Group>`}
    >
      <RadioErrorDemo client:visible />
    </ComponentExample>

    <Heading level={3}>Disabled</Heading>
    <p>
      Disable the entire group or individual items.
    </p>
    <ComponentExample
      code={`<Radio.Group legend="Disabled group" disabled defaultValue="a">

  <Radio.Item label="Option A" value="a" />
  <Radio.Item label="Option B" value="b" />
</Radio.Group>

<Radio.Group legend="Individual disabled" defaultValue="available">
  <Radio.Item label="Available" value="available" />
  <Radio.Item label="Unavailable" value="unavailable" disabled />
</Radio.Group>`}
    >
      <RadioDisabledDemo client:visible />
    </ComponentExample>

    <Heading level={3}>Control Position</Heading>
    <p>
      Use `controlPosition="end"` to place labels before radio buttons.
    </p>
    <ComponentExample
      code={`<Radio.Group legend="Preferences" controlPosition="end" defaultValue="a">

  <Radio.Item label="Label before radio" value="a" />
  <Radio.Item label="Another option" value="b" />
</Radio.Group>`}
    >
      <RadioControlPositionDemo client:visible />
    </ComponentExample>
  </ComponentSection>

{/* API Reference */}

  <ComponentSection>
    <Heading level={2}>API Reference</Heading>

    <Heading level={3}>Radio.Group</Heading>
    <p>
      Container for radio buttons with legend, description, and error
      support.
    </p>
    <PropsTable component="Radio.Group" />

    <Heading level={3}>Radio.Item</Heading>
    <p>
      Individual radio button within Radio.Group.
    </p>
    <PropsTable component="Radio.Item" />

  </ComponentSection>

{/* Accessibility */}

<ComponentSection>
  <Heading level={2}>Accessibility</Heading>
  <div class="space-y-4 text-sm">
    <div>
      <h3 class="mb-2 font-semibold">Semantic HTML</h3>
      <p class="text-kumo-strong">
        Radio.Group uses semantic
        `<fieldset>`
        and
        `<legend>`
        elements for proper grouping and screen reader announcement.
      </p>
    </div>
    <div>
      <h3 class="mb-2 font-semibold">Keyboard Navigation</h3>
      <p class="text-kumo-strong">
        <kbd class="rounded bg-kumo-control px-1.5 py-0.5">Arrow Up/Down</kbd>
        or
        <kbd class="rounded bg-kumo-control px-1.5 py-0.5">
          Arrow Left/Right
        </kbd>
        moves between options.
        <kbd class="rounded bg-kumo-control px-1.5 py-0.5">Space</kbd> selects
        the focused option.
        <kbd class="rounded bg-kumo-control px-1.5 py-0.5">Tab</kbd> moves focus
        to and from the radio group.
      </p>
    </div>
    <div>
      <h3 class="mb-2 font-semibold">Screen Readers</h3>
      <p class="text-kumo-strong">
        Each radio is announced with its label and selection state. The group
        legend provides context for all options.
      </p>
    </div>
  </div>
</ComponentSection>
