Radio Group

Radio Groups contain a set of checkable buttons where only one of the buttons can be checked at a time.

Introduction

index.tsx

'use client';
import * as React from 'react';
import { RadioGroup } from '@base_ui/react/RadioGroup';
import { Radio } from '@base_ui/react/Radio';
import { styled } from '@mui/system';

export default function UnstyledRadioGroupIntroduction() {
  return (
    <RadioGroup.Root name="root" style={{ display: 'flex', gap: 8 }}>
      <RadioItem value="light">
        <Indicator />
        Light
      </RadioItem>
      <RadioItem value="medium">
        <Indicator />
        Medium
      </RadioItem>
      <RadioItem value="heavy">
        <Indicator />
        Heavy
      </RadioItem>
    </RadioGroup.Root>
  );
}

const grey = {
  100: '#E5EAF2',
  200: '#D8E0E9',
  300: '#CBD4E2',
};

const blue = {
  400: '#3399FF',
  600: '#0072E6',
  800: '#004C99',
};

const RadioItem = styled(Radio.Root)`
  display: flex;
  align-items: center;
  padding: 8px 16px;
  border-radius: 4px;
  border: none;
  background-color: ${grey[100]};
  color: black;
  outline: none;
  font-size: 16px;
  cursor: default;

  &:hover {
    background-color: ${grey[100]};
  }

  &:focus-visible {
    outline: 2px solid ${blue[400]};
    outline-offset: 2px;
  }

  &[data-radio='checked'] {
    background-color: ${blue[600]};
    color: white;
  }
`;

const Indicator = styled(Radio.Indicator)`
  border-radius: 50%;
  width: 8px;
  height: 8px;
  margin-right: 8px;
  outline: 1px solid black;

  &[data-radio='checked'] {
    background-color: white;
    border: none;
    outline: none;
  }
`;

Installation

Base UI components are all available as a single package.

npm install @base_ui/react

Once you have the package installed, import the component.

import { RadioGroup } from '@base_ui/react/RadioGroup';
import { Radio } from '@base_ui/react/Radio';

Anatomy

Radio Group is composed of a Root and Radio components:

<RadioGroup.Root /> is a top-level element that wraps the other components.
<Radio.Root /> renders an individual <button> radio item.
<Radio.Indicator /> renders a <span> for providing a visual indicator. You can style this itself and/or place an icon inside.

<RadioGroup.Root>
  <Radio.Root>
    <Radio.Indicator />
  </Radio.Root>
</RadioGroup.Root>

Identifying items

The value prop is required on Radio.Root to identify it in the Radio Group:

<RadioGroup.Root>
  <Radio.Root value="a">
    <Radio.Indicator />
  </Radio.Root>
  <Radio.Root value="b">
    <Radio.Indicator />
  </Radio.Root>
</RadioGroup.Root>

Default value

The defaultValue prop determines the initial value of the component when uncontrolled, linked to the value prop on an individual Radio item:

<RadioGroup.Root defaultValue="a">
  <Radio.Root value="a" />
  <Radio.Root value="b" />
</RadioGroup.Root>

Controlled

The value and onValueChange props contain the value string of the currently selected Radio item in the Radio Group:

const [value, setValue] = React.useState('a');

return (
  <RadioGroup.Root value={value} onValueChange={setValue}>
    <Radio.Root value="a" />
    <Radio.Root value="b" />
  </RadioGroup.Root>
);

Styling

The Radio components have a [data-radio] attribute with values "checked" or "unchecked" to style based on the checked state:

<Radio.Root className="Radio">
  <Radio.Indicator className="RadioIndicator" />
</Radio.Root>

.Radio {
  border: 1px solid black;
}

.RadioIndicator {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1px solid black;
}

.Radio[data-radio='checked'] {
  background: black;
  color: white;
}

.RadioIndicator[data-radio='checked'] {
  background: white;
}

API Reference

RadioGroupRoot

Prop	Type	Default	Description
`className`	`union`		Class names applied to the element or a function that returns them based on the component's state.
`defaultValue`	`any`		The default value of the selected radio button. Use when uncontrolled.
`disabled`	`bool`	`false`	Determines if the radio group is disabled.
`name`	`string`		The name of the radio group submitted with the form data.
`onValueChange`	`func`		Callback fired when the value changes.
`readOnly`	`bool`	`false`	Determines if the radio group is readonly.
`render`	`union`		A function to customize rendering of the component.
`required`	`bool`	`false`	Determines if the radio group is required.
`value`	`any`		The value of the selected radio button. Use when controlled.

RadioRoot

Prop	Type	Default	Description
`value`	`any`		The unique identifying value of the radio in a group.
`className`	`union`		Class names applied to the element or a function that returns them based on the component's state.
`disabled`	`bool`	`false`	Determines if the radio is disabled.
`readOnly`	`bool`	`false`	Determines if the radio is readonly.
`render`	`union`		A function to customize rendering of the component.
`required`	`bool`	`false`	Determines if the radio is required.

RadioIndicator

Prop	Type	Default	Description
`className`	`union`		Class names applied to the element or a function that returns them based on the component's state.
`keepMounted`	`bool`	`true`	Whether the component should be kept mounted when not checked.
`render`	`union`		A function to customize rendering of the component.

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