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Button API

API reference docs for the React Button component. Learn about the props, CSS, and other APIs of this exported module.

Demos

Import

import Button from '@mui/joy/Button';
// or
import { Button } from '@mui/joy';

Learn about the difference by reading this guide on minimizing bundle size.

Props

NameTypeDefaultDescription
actionfunc
| { current?: { focusVisible: func } }
-

A ref for imperative actions. It currently only supports focusVisible() action.

color'danger'
| 'neutral'
| 'primary'
| 'success'
| 'warning'
| string
'primary'

The color of the component. It supports those theme colors that make sense for this component.

To learn how to add your own colors, check out Themed components—Extend colors.

componentelementType-

The component used for the root node. Either a string to use a HTML element or a component.

disabledboolfalse

If true, the component is disabled.

endDecoratornode-

Element placed after the children.

fullWidthboolfalse

If true, the button will take up the full width of its container.

loadingboolfalse

If true, the loading indicator is shown and the button becomes disabled.

loadingIndicatornode<CircularProgress />

The node should contain an element with role="progressbar" with an accessible name. By default we render a CircularProgress that is labelled by the button itself.

loadingPosition'center'
| 'end'
| 'start'
'center'

The loading indicator can be positioned on the start, end, or the center of the button.

size'sm'
| 'md'
| 'lg'
| string
'md'

The size of the component.

To learn how to add custom sizes to the component, check out Themed components—Extend sizes.

slotProps{ endDecorator?: func
| object, loadingIndicatorCenter?: func
| object, root?: func
| object, startDecorator?: func
| object }
{}

The props used for each slot inside.

slots{ endDecorator?: elementType, loadingIndicatorCenter?: elementType, root?: elementType, startDecorator?: elementType }{}

The components used for each slot inside.

See Slots API below for more details.

startDecoratornode-

Element placed before the children.

sxArray<func
| object
| bool>
| func
| object
-

The system prop that allows defining system overrides as well as additional CSS styles.

See the `sx` page for more details.

variant'outlined'
| 'plain'
| 'soft'
| 'solid'
| string
'solid'

The global variant to use.

To learn how to add your own variants, check out Themed components—Extend variants.

The ref is forwarded to the root element.

Theme default props

You can use JoyButton to change the default props of this component with the theme.

Slots

To learn how to customize the slot, check out the Overriding component structure guide.

Slot nameClass nameDefault componentDescription
root.MuiButton-root'button'The component that renders the root.
startDecorator.MuiButton-startDecorator'span'The component that renders the start decorator.
endDecorator.MuiButton-endDecorator'span'The component that renders the end decorator.
loadingIndicatorCenter.MuiButton-loadingIndicatorCenter'span'The component that renders the loading indicator center.

CSS classes

These class names are useful for styling with CSS. They are applied to the component's slots when specific states are triggered.

Class nameRule nameDescription
.Mui-disabledState class applied to the root element if disabled={true}.
.Mui-focusVisibleState class applied to the ButtonBase root element if the button is keyboard focused.
.MuiButton-colorContextcolorContextClass name applied to the root element when color inversion is triggered.
.MuiButton-colorDangercolorDangerClass name applied to the root element if color="danger".
.MuiButton-colorNeutralcolorNeutralClass name applied to the root element if color="neutral".
.MuiButton-colorPrimarycolorPrimaryClass name applied to the root element if color="primary".
.MuiButton-colorSuccesscolorSuccessClass name applied to the root element if color="success".
.MuiButton-colorWarningcolorWarningClass name applied to the root element if color="warning".
.MuiButton-fullWidthfullWidthClass name applied to the root element if fullWidth={true}.
.MuiButton-loadingloadingClass name applied to the root element if loading={true}.
.MuiButton-sizeLgsizeLgClass name applied to the root element if size="lg".
.MuiButton-sizeMdsizeMdClass name applied to the root element if size="md".
.MuiButton-sizeSmsizeSmClass name applied to the root element if size="sm".
.MuiButton-variantOutlinedvariantOutlinedClass name applied to the root element if variant="outlined".
.MuiButton-variantPlainvariantPlainClass name applied to the root element if variant="plain".
.MuiButton-variantSoftvariantSoftClass name applied to the root element if variant="soft".
.MuiButton-variantSolidvariantSolidClass name applied to the root element if variant="solid".

You can override the style of the component using one of these customization options:

Source code

If you did not find the information in this page, consider having a look at the implementation of the component for more detail.