Import

import Alert from '@mui/material/Alert';
// or
import { Alert } from '@mui/material';

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

Props of the Paper component are also available.

Name	Type	Default	Description
action	node	-	The action to display. It renders after the message, at the end of the alert.
children	node	-	The content of the component.
classes	object	-	Override or extend the styles applied to the component. See CSS classes API below for more details.
closeText	string	‘Close’	Override the default label for the close popup icon button. For localization purposes, you can use the provided translations.
color	‘error’ | ‘info’ | ‘success’ | ‘warning’ | string	-	The color of the component. Unless provided, the value is taken from the severity prop. It supports both default and custom theme colors, which can be added as shown in the palette customization guide.
components	{ CloseButton?: elementType, CloseIcon?: elementType }	{}	The components used for each slot inside.
componentsProps	{ closeButton?: object, closeIcon?: object }	{}	The extra props for the slot components. You can override the existing props or add new ones.
icon	node	-	Override the icon displayed before the children. Unless provided, the icon is mapped to the value of the severity prop. Set to false to remove the icon.
iconMapping	{ error?: node, info?: node, success?: node, warning?: node }	-	The component maps the severity prop to a range of different icons, for instance success to <SuccessOutlined>. If you wish to change this mapping, you can provide your own. Alternatively, you can use the icon prop to override the icon displayed.
onClose	func	-	Callback fired when the component requests to be closed. When provided and no action prop is set, a close icon button is displayed that triggers the callback when clicked. Signature: function(event: React.SyntheticEvent) => void
role	string	‘alert’	The ARIA role attribute of the element.
severity	‘error’ | ‘info’ | ‘success’ | ‘warning’ | string	‘success’	The severity of the alert. This defines the color and icon used.
slotProps	{ closeButton?: func | object, closeIcon?: func | object }	{}	The props used for each slot inside.
slots	{ closeButton?: elementType, closeIcon?: elementType }	{}	The components used for each slot inside.
sx	Array<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	‘filled’ | ‘outlined’ | ‘standard’ | string	‘standard’	The variant to use.

The ref is forwarded to the root element.

Inheritance

While not explicitly documented above, the props of the Paper component are also available in Alert. You can take advantage of this to target nested components.

Theme default props

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

Slot name	Class name	Default component	Description
closeButton	-	IconButton	The component that renders the close button.
closeIcon	-	svg	The component that renders the close icon.

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

Class name	Rule name	Description
.MuiAlert-action	action	Styles applied to the action wrapper element if action is provided.
.MuiAlert-colorError	colorError	Styles applied to the root element if color="error".
.MuiAlert-colorInfo	colorInfo	Styles applied to the root element if color="info".
.MuiAlert-colorSuccess	colorSuccess	Styles applied to the root element if color="success".
.MuiAlert-colorWarning	colorWarning	Styles applied to the root element if color="warning".
.MuiAlert-filled	filled	Styles applied to the root element if variant="filled".
.MuiAlert-filledError	filledError	Styles applied to the root element if variant="filled" and color="error".
.MuiAlert-filledInfo	filledInfo	Styles applied to the root element if variant="filled" and color="info".
.MuiAlert-filledSuccess	filledSuccess	Styles applied to the root element if variant="filled" and color="success".
.MuiAlert-filledWarning	filledWarning	Styles applied to the root element if variant="filled" and color="warning"
.MuiAlert-icon	icon	Styles applied to the icon wrapper element.
.MuiAlert-message	message	Styles applied to the message wrapper element.
.MuiAlert-outlined	outlined	Styles applied to the root element if variant="outlined".
.MuiAlert-outlinedError	outlinedError	Styles applied to the root element if variant="outlined" and color="error".
.MuiAlert-outlinedInfo	outlinedInfo	Styles applied to the root element if variant="outlined" and color="info".
.MuiAlert-outlinedSuccess	outlinedSuccess	Styles applied to the root element if variant="outlined" and color="success".
.MuiAlert-outlinedWarning	outlinedWarning	Styles applied to the root element if variant="outlined" and color="warning".
.MuiAlert-root	root	Styles applied to the root element.
.MuiAlert-standard	standard	Styles applied to the root element if variant="standard".
.MuiAlert-standardError	standardError	Styles applied to the root element if variant="standard" and color="error".
.MuiAlert-standardInfo	standardInfo	Styles applied to the root element if variant="standard" and color="info".
.MuiAlert-standardSuccess	standardSuccess	Styles applied to the root element if variant="standard" and color="success".
.MuiAlert-standardWarning	standardWarning	Styles applied to the root element if variant="standard" and color="warning".

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

• With a global class name.
• With a rule name as part of the component’s styleOverrides property in a custom theme.

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.