---
filename: /packages/material-ui-lab/src/Alert/Alert.js
---

<!--- This documentation is automatically generated, do not try to edit it. -->

# Alert API

<p class="description">The API documentation of the Alert React component. Learn more about the props and the CSS customization points.</p>

## Import

```js
import Alert from '@material-ui/lab/Alert';
// or
import { Alert } from '@material-ui/lab';
```

You can learn more about the difference by [reading this guide](/guides/minimizing-bundle-size/).



## Component name

The `MuiAlert` name can be used for providing [default props](/customization/globals/#default-props) or [style overrides](/customization/globals/#css) at the theme level.

## Props

| Name | Type | Default | Description |
|:-----|:-----|:--------|:------------|
| <span class="prop-name">action</span> | <span class="prop-type">node</span> |  | The action to display. It renders after the message, at the end of the alert. |
| <span class="prop-name">children</span> | <span class="prop-type">node</span> |  | The content of the component. |
| <span class="prop-name">classes</span> | <span class="prop-type">object</span> |  | Override or extend the styles applied to the component. See [CSS API](#css) below for more details. |
| <span class="prop-name">closeText</span> | <span class="prop-type">string</span> | <span class="prop-default">'Close'</span> | Override the default label for the *close popup* icon button.<br>For localization purposes, you can use the provided [translations](/guides/localization/). |
| <span class="prop-name">color</span> | <span class="prop-type">'error'<br>&#124;&nbsp;'info'<br>&#124;&nbsp;'success'<br>&#124;&nbsp;'warning'</span> |  | The main color for the alert. Unless provided, the value is taken from the `severity` prop. |
| <span class="prop-name">icon</span> | <span class="prop-type">node</span> |  | Override the icon displayed before the children. Unless provided, the icon is mapped to the value of the `severity` prop. |
| <span class="prop-name">iconMapping</span> | <span class="prop-type">{ error?: node, info?: node, success?: node, warning?: node }</span> |  | 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. |
| <span class="prop-name">onClose</span> | <span class="prop-type">func</span> |  | 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.<br><br>**Signature:**<br>`function(event: object) => void`<br>*event:* The event source of the callback. |
| <span class="prop-name">role</span> | <span class="prop-type">string</span> | <span class="prop-default">'alert'</span> | The ARIA role attribute of the element. |
| <span class="prop-name">severity</span> | <span class="prop-type">'error'<br>&#124;&nbsp;'info'<br>&#124;&nbsp;'success'<br>&#124;&nbsp;'warning'</span> | <span class="prop-default">'success'</span> | The severity of the alert. This defines the color and icon used. |
| <span class="prop-name">variant</span> | <span class="prop-type">'filled'<br>&#124;&nbsp;'outlined'<br>&#124;&nbsp;'standard'</span> | <span class="prop-default">'standard'</span> | The variant to use. |

The `ref` is forwarded to the root element.

Any other props supplied will be provided to the root element ([Paper](/api/paper/)).

## CSS

| Rule name | Global class | Description |
|:-----|:-------------|:------------|
| <span class="prop-name">root</span> | <span class="prop-name">.MuiAlert-root</span> | Styles applied to the root element.
| <span class="prop-name">standardSuccess</span> | <span class="prop-name">.MuiAlert-standardSuccess</span> | Styles applied to the root element if `variant="standard"` and `color="success"`.
| <span class="prop-name">standardInfo</span> | <span class="prop-name">.MuiAlert-standardInfo</span> | Styles applied to the root element if `variant="standard"` and `color="info"`.
| <span class="prop-name">standardWarning</span> | <span class="prop-name">.MuiAlert-standardWarning</span> | Styles applied to the root element if `variant="standard"` and `color="warning"`.
| <span class="prop-name">standardError</span> | <span class="prop-name">.MuiAlert-standardError</span> | Styles applied to the root element if `variant="standard"` and `color="error"`.
| <span class="prop-name">outlinedSuccess</span> | <span class="prop-name">.MuiAlert-outlinedSuccess</span> | Styles applied to the root element if `variant="outlined"` and `color="success"`.
| <span class="prop-name">outlinedInfo</span> | <span class="prop-name">.MuiAlert-outlinedInfo</span> | Styles applied to the root element if `variant="outlined"` and `color="info"`.
| <span class="prop-name">outlinedWarning</span> | <span class="prop-name">.MuiAlert-outlinedWarning</span> | Styles applied to the root element if `variant="outlined"` and `color="warning"`.
| <span class="prop-name">outlinedError</span> | <span class="prop-name">.MuiAlert-outlinedError</span> | Styles applied to the root element if `variant="outlined"` and `color="error"`.
| <span class="prop-name">filledSuccess</span> | <span class="prop-name">.MuiAlert-filledSuccess</span> | Styles applied to the root element if `variant="filled"` and `color="success"`.
| <span class="prop-name">filledInfo</span> | <span class="prop-name">.MuiAlert-filledInfo</span> | Styles applied to the root element if `variant="filled"` and `color="info"`.
| <span class="prop-name">filledWarning</span> | <span class="prop-name">.MuiAlert-filledWarning</span> | Styles applied to the root element if `variant="filled"` and `color="warning"`.
| <span class="prop-name">filledError</span> | <span class="prop-name">.MuiAlert-filledError</span> | Styles applied to the root element if `variant="filled"` and `color="error"`.
| <span class="prop-name">icon</span> | <span class="prop-name">.MuiAlert-icon</span> | Styles applied to the icon wrapper element.
| <span class="prop-name">message</span> | <span class="prop-name">.MuiAlert-message</span> | Styles applied to the message wrapper element.
| <span class="prop-name">action</span> | <span class="prop-name">.MuiAlert-action</span> | Styles applied to the action wrapper element if `action` is provided.

You can override the style of the component thanks to one of these customization points:

- With a rule name of the [`classes` object prop](/customization/components/#overriding-styles-with-classes).
- With a [global class name](/customization/components/#overriding-styles-with-global-class-names).
- With a theme and an [`overrides` property](/customization/globals/#css).

If that's not sufficient, you can check the [implementation of the component](https://github.com/mui-org/material-ui/blob/master/packages/material-ui-lab/src/Alert/Alert.js) for more detail.

## Inheritance

The props of the [Paper](/api/paper/) component are also available.
You can take advantage of this behavior to [target nested components](/guides/api/#spread).

## Demos

- [Alert](/components/alert/)