Radio
Radio buttons allow the user to select one option from a set.
Use radio buttons when the user needs to see all available options. If available options can be collapsed, consider using a dropdown menu because it uses less space.
Radio buttons should have the most commonly used option selected by default.
RadioGroup
RadioGroup
is a helpful wrapper used to group Radio
components that provides an easier API, and proper keyboard accessibility to the group.
To lay out the buttons horizontally, set the row
prop: <RadioGroup row />
.
Standalone radio buttons
Radio
can also be used standalone, without the RadioGroup wrapper.
Label placement
You can change the placement of the label with the FormControlLabel
component's labelPlacement
prop:
Show error
In general, radio buttons should have a value selected by default. If this is not the case, you can display an error if no value is selected when the form is submitted:
Customized radios
Here is an example of customizing the component. You can learn more about this in the overrides documentation page.
<FormControl component="fieldset">
<FormLabel component="legend">Gender</FormLabel>
<RadioGroup defaultValue="female" aria-label="gender" name="customized-radios">
<FormControlLabel value="female" control={<StyledRadio />} label="Female" />
<FormControlLabel value="male" control={<StyledRadio />} label="Male" />
<FormControlLabel value="other" control={<StyledRadio />} label="Other" />
<FormControlLabel
value="disabled"
disabled
control={<StyledRadio />}
label="(Disabled option)"
/>
</RadioGroup>
</FormControl>
useRadioGroup
For advanced customization use cases, a useRadioGroup()
hook is exposed.
It returns the context value of the parent radio group.
The Radio component uses this hook internally.
API
import { useRadioGroup } from '@material-ui/core/RadioGroup';
Returns
value
(Object):
value.name
(String [optional]): The name used to reference the value of the control.value.onChange
(Void [optional]): Callback fired when a radio button is selected.value.value
(Any [optional]): Value of the selected radio button.
Example
<RadioGroup name="use-radio-group" defaultValue="first">
<MyFormControlLabel value="first" label="First" control={<Radio />} />
<MyFormControlLabel value="second" label="Second" control={<Radio />} />
</RadioGroup>
When to use
Accessibility
(WAI-ARIA: https://www.w3.org/TR/wai-aria-practices/#radiobutton)
- All form controls should have labels, and this includes radio buttons, checkboxes, and switches. In most cases, this is done by using the
<label>
element (FormControlLabel). - When a label can't be used, it's necessary to add an attribute directly to the input component.
In this case, you can apply the additional attribute (e.g.
aria-label
,aria-labelledby
,title
) via theinputProps
property.
<RadioButton
value="radioA"
inputProps={{
'aria-label': 'Radio A',
}}
/>