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An alert displays a short, important message in a way that attracts the user's attention without interrupting the user's task.

Basic alerts

The alert offers four severity levels that set a distinctive icon and color.

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You can use the AlertTitle component to display a formatted title above the content.

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An alert can have an action, such as a close or undo button. It is rendered after the message, at the end of the alert.

If an onClose callback is provided and no action prop is set, a close icon is displayed. The action prop can be used to provide an alternative action, for example using a Button or IconButton.

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You can use a transition component such as Collapse to transition the appearance of the alert.


The icon prop allows you to add an icon to the beginning of the alert component. This will override the default icon for the specified severity.

You can change the default severity to icon mapping with the iconMapping prop. This can be defined globally using theme customization.

Setting the icon prop to false will remove the icon altogether.

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Two additional variants are available โ€“ outlined, and filled:


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When using an outlined alert with the Snackbar component, background content will be visible and bleed through the alert by default. You can prevent this by adding bgcolor: 'background.paper' to thesx prop on the Alert component.


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You can use the Snackbar to display a toast with the Alert.


The color prop will override the default color for the specified severity.

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When the component is dynamically displayed, the content is automatically announced by most screen readers. At this time, screen readers do not inform users of alerts that are present when the page loads.

Using color to add meaning only provides a visual indication, which will not be conveyed to users of assistive technologies such as screen readers. Ensure that information denoted by the color is either obvious from the content itself (for example the visible text), or is included through alternative means, such as additional hidden text.

Actions must have a tab index of 0 so that they can be reached by keyboard-only users.


See the documentation below for a complete reference to all of the props and classes available to the components mentioned here.