# Notice
Use Notices to communicate prominent messages to the user.
## Table of contents
1. [Design guidelines](#design-guidelines)
2. [Development guidelines](#development-guidelines)
3. [Related components](#related-components)
## Design guidelines
A Notice displays a succinct message. It can also offer the user options, like viewing a published post or updating a setting, and requires a user action to be dismissed.
Use Notices to communicate things that are important but don’t necessarily require action — a user can keep using the product even if they don’t choose to act on a Notice. They are less interruptive than a Modal.
### Anatomy
1. Container (status indicated with color)
2. Icon (optional)
3. Message
4. Dismiss icon (optional)
### Usage
Notices display at the top of the screen, below any toolbars anchored to the top of the page. They’re persistent and non-modal. Since they don’t overlay the content, users can ignore or dismiss them, and choose when to interact with them.
Notices are color-coded to indicate the type of message being communicated:
- **Default** notices have **no background**.
- **Informational** notices are **blue.**
- **Success** notices are **green.**
- **Warning** notices are **yellow\*\***.\*\*
- **Error** notices are **red.**
If an icon is included in the Notice, it should be color-coded to match the Notice state.
**Do**
Do use a Notice when you want to communicate a message of medium importance.
**Don’t**
Don't use a Notice for a message that requires immediate attention and action from the user. Use a Modal for this instead.
**Do**
Do display Notices at the top of the screen, below any toolbars.
**Don’t**
Don't show Notices on top of toolbars.
**Do**
Do use color to indicate the type of message being communicated.
**Don’t**
Don't apply any colors other than those for Warnings, Success, or Errors.
## Development guidelines
### Usage
To display a plain notice, pass `Notice` a string:
```jsx
const MyNotice = () => (
An unknown error occurred.
);
```
For more complex markup, you can pass any JSX element:
```jsx
const MyNotice = () => (
An error occurred: { errorDetails }.
);
```
#### Props
The following props are used to control the behavior of the component.
- `children`: (string) The displayed message of a notice. Also used as the spoken message for assistive technology, unless `spokenMessage` is provided as an alternative message.
- `spokenMessage`: (string) Used to provide a custom spoken message in place of the `children` default.
- `status`: (string) can be `warning` (yellow), `success` (green), `error` (red), or `info`. Defaults to `info`.
- `onRemove`: function called when dismissing the notice
- `politeness`: (string) A politeness level for the notice's spoken message. Should be provided as one of the valid options for [an `aria-live` attribute value](https://www.w3.org/TR/wai-aria-1.1/#aria-live). If not provided, a sensible default is used based on the notice status. Note that this value should be considered a suggestion; assistive technologies may override it based on internal heuristics.
- A value of `'assertive'` is to be used for important, and usually time-sensitive, information. It will interrupt anything else the screen reader is announcing in that moment.
- A value of `'polite'` is to be used for advisory information. It should not interrupt what the screen reader is announcing in that moment (the "speech queue") or interrupt the current task.
- `isDismissible`: (boolean) defaults to true, whether the notice should be dismissible or not
- `actions`: (array) an array of action objects. Each member object should contain a `label` and either a `url` link string or `onClick` callback function. A `className` property can be used to add custom classes to the button styles. The default appearance of the button is inferred based on whether `url` or `onClick` are provided, rendering the button as a link if appropriate. A `noDefaultClasses` property value of `true` will remove all default styling. You can denote a primary button action for a notice by assigning a `isPrimary` value of `true`.
## Related components
- To create a more prominent message that requires action, use a Modal.