# SnackBar with action no longer auto-dismisses

> SnackBars with an action button now default to not auto-dismissing unless manually dismissed by the user.




:::important
These breaking change docs are accurate, as of the release
under which they are published. Over time, the
workarounds described here might become inaccurate.
We don't, in general, keep these breaking change docs up
to date as of each release.

The [breaking change index file](/release/breaking-changes)
lists the docs created for each release.
:::


## Summary

The default behavior of a [`SnackBar`][] with an action has changed.
Previously, a `SnackBar` with an action wouldn't
auto-dismiss if talkback was enabled.
Now, all `SnackBar` widgets with an action default to
a non-dismissible state until the user interacts with the action button.

## Context

A `SnackBar` with an action button is now treated as
a more persistent notification that requires user interaction.
This change improves accessibility and user experience by ensuring that
critical notifications remain on the screen until they are acknowledged.

## Description of change

This change aligns with the Material 3 design specification for
the `SnackBar` component:

* Old behavior: A `SnackBar` with an action button would auto-dismiss after a
  duration unless talkback was enabled.
* New behavior: A `SnackBar` with an action button won't auto-dismiss;
  it remains on screen until dismissed by the user.

To override this behavior, an optional `persist` property has
been added to `SnackBar`.
When `persist` is `true`, the `SnackBar` won't auto-dismiss and
remains on screen until manually dismissed by the user.
When `false`, the `SnackBar` auto-dismisses after its standard duration,
regardless of the presence of an action.
When `null`, the `SnackBar` follows the default behavior,
which won't auto-dismiss if an action is present.

## Migration guide

To restore the old auto-dismiss behavior for a SnackBar with an action, set
`persist` to `false`.

Code before migration:

```dart
ScaffoldMessenger.of(context).showSnackBar(
  SnackBar(
    content: const Text('This is a snackbar with an action.'),
    action: SnackBarAction(
      label: 'Action',
      onPressed: () {
        // Perform some action
      },
    ),
  ),
);
```

Code after migration:

```dart highlightLines=4
ScaffoldMessenger.of(context).showSnackBar(
  SnackBar(
    content: const Text('This is a snackbar with an action.'),
    persist: false, // Add this line to restore auto-dismiss behavior
    action: SnackBarAction(
      label: 'Action',
      onPressed: () {
        // Perform some action
      },
    ),
  ),
);
```

## Timeline

Landed in version: 3.37.0-0.0.pre
In stable release: 3.38

## References

API documentation:

* [`SnackBar`][]

Relevant PRs:

* [SnackBar with action no longer auto-dismisses][]

[`SnackBar`]: https://api.flutter.dev/flutter/material/SnackBar-class.html

[SnackBar with action no longer auto-dismisses]: https://github.com/flutter/flutter/pull/173084