metamask-extension/ui/components/component-library/banner/README.mdx

import { Story, Canvas, ArgsTable } from '@storybook/addon-docs';
import { Banner } from './banner';
import { BannerBase } from '..';

# Banner

The `Banner` component is used for inline notifcations and has different colors based on context's severity.

<Canvas>
  <Story id="components-componentlibrary-banner--default-story" />
</Canvas>

## Props

The `Banner` accepts all props below as well as all [Box](/docs/components-ui-box--default-story#props) component props

<ArgsTable of={Banner} />

The `Banner` accepts all `BannerBase` component props below

<ArgsTable of={BannerBase} />

### Severity

Use the `severity` prop and the `SEVERITIES` object from `./ui/helpers/constants/design-system.js` to change the context of `Banner`.

Optional: `BANNER_SEVERITIES` from `./banner` object can be used instead of `SEVERITIES`.

Possible options:

- `SEVERITIES.INFO` Default
- `SEVERITIES.WARNING`
- `SEVERITIES.DANGER`
- `SEVERITIES.SUCCESS`

<Canvas>
  <Story id="components-componentlibrary-banner--severity" />
</Canvas>

```jsx
import { Banner } from '../../component-library';
import { SEVERITIES } from '../../../helpers/constants/design-system';

<Banner title="Info">
  This is a demo of severity Info.
</Banner>
<Banner severity={SEVERITIES.WARNING} title="Warning">
  This is a demo of severity Warning.
</Banner>
<Banner severity={SEVERITIES.DANGER} title="Danger">
  This is a demo of severity Danger.
</Banner>
<Banner severity={SEVERITIES.SUCCESS} title="Success">
  This is a demo of severity Success.
</Banner>
```

### Title

Use the `title` prop to pass a string that is sentence case no period. Use the `titleProps` prop to pass additional props to the `Text` component.

<Canvas>
  <Story id="components-componentlibrary-banner--title" />
</Canvas>

```jsx
import { Banner } from '../../component-library';

<Banner title="Title is sentence case no period">
  Pass only a string through the title prop
</Banner>;
```

### Children

The `children` is the description area of the `Banner` that can be a text or react node. Description shouldn't repeat title and only 1-3 lines.

<Canvas>
  <Story id="components-componentlibrary-banner--children" />
</Canvas>

```jsx
import { SIZES } from '../../../helpers/constants/design-system';
import { Banner } from '../../component-library';

<Banner>
  {`Description shouldn't repeat title. 1-3 lines. Can contain a `}
  <ButtonLink size={SIZES.AUTO} href="https://metamask.io/" target="_blank">
    hyperlink.
  </ButtonLink>
</Banner>;
```

### Action Button Label, onClick, & Props

Use the `actionButtonLabel` prop to pass text, `actionButtonOnClick` prop to pass an onClick handler, and `actionButtonProps` prop to pass an object of [ButtonLink props](/docs/components-componentlibrary-buttonlink--default-story) for the action

<Canvas>
  <Story id="components-componentlibrary-banner--action-button" />
</Canvas>

```jsx
import { Banner, ICON_NAMES } from '../../component-library';

<Banner
  title="Action prop demo"
  actionButtonLabel="Action"
  actionButtonProps={{
    icon: ICON_NAMES.ARROW_2_RIGHT, // TODO: change to iconName
    iconPositionRight: true,
  }}
  actionButtonOnClick={() => console.log('ButtonLink actionButtonOnClick demo')}
>
  Use actionButtonLabel for action text, actionButtonOnClick for the onClick
  handler, and actionButtonProps to pass any ButtonLink prop types such as
  iconName
</Banner>;
```

### On Close

Use the `onClose` prop to pass a function to the close button. The close button will appear when this prop is used.

Additional props can be passed to the close button with `closeButtonProps`

<Canvas>
  <Story id="components-componentlibrary-banner--on-close" />
</Canvas>

```jsx
import { Banner } from '../../component-library';

<Banner
  title="onClose demo"
  onClose={() => console.log('close button clicked')}
>
  Click the close button icon to hide this notifcation
</Banner>;
```