CMS Design System

A drawer provides a space for medium to long-form help content — content that's too long or not common enough to warrant being on the page by default.

On large screens it's fixed to the side of the screen, and on smaller screens it overlays the entire screen.

Render the drawer below the toggle button that triggers it. This way the markup remains semantically sound and screen reader friendly.

`<Drawer>`

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Props

React Properties Documentation
Name	Type	Default	Description
`ariaLabel`	`string`		Gives more context to screen readers on the Drawer close button.
`closeButtonText`	`React.ReactNode`
`children`required	`React.ReactNode`
`className`	`string`
`footerBody`	`React.ReactNode`
`footerTitle`	`string`
`hasFocusTrap`	`boolean`		Enables focus trap functionality within Drawer.
`heading`required	`string \| React.ReactNode`		Text for the Drawer heading. Required because the `heading` will be focused on mount.
`headingId`	`string`		A unique `id` to be used on heading element to label multiple instances of Drawer.
`headingLevel`	`'1' \| '2' \| '3' \| '4' \| '5'`	`'3'`	Heading type to override default `<h3>`
`headingRef`	`React.MutableRefObject<any>`		Ref to heading element
`isHeaderSticky`	`boolean`		Enables "sticky" position of Drawer header element.
`isFooterSticky`	`boolean`		Enables "sticky" position of Drawer footer element.
`onCloseClick`required	`(event: React.MouseEvent \| React.KeyboardEvent) => void`

Layout Alternatives

A header and/or footer can have a "sticky" position if the following properties are applied to their respective elements:

isHeaderSticky
isFooterSticky

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Focus Trap

A focus trap can be set on a drawer if the property hasFocusTrap is enabled. A user can escape the focus trap by pressing the ESC key.

`<DrawerToggle>`

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React Properties Documentation
Name	Type	Description
`drawerOpen`required	`boolean`	Determines if Drawer is open or closed. This value is used to re-focus the toggle that opened the drawer when the drawer closes.
`children`required	`React.ReactNode`	DrawerToggle content.
`className`	`string`	Additional classes for the toggle button anchor element.
`inline`	`boolean`	Adds `display: inline` to the DrawerToggle.
`showDrawer`required	`(string) => any`	This function is called with an id that the toggle generates. It can be used in implementing the Drawer for keeping track of which drawer the toggle controls.

`<HelpDrawer>`

This component is an enhanced <Drawer> component, providing the same properties as <Drawer> in addition to Google Analytics properties.

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React Properties Documentation
Name	Type	Default	Description
`analytics`	`boolean`		Analytics events tracking is enabled by default. Set this value to `false` to disable tracking for this component instance.
`analyticsLabelOverride`	`string`		An override for the dynamic content sent to analytics services. By default this content comes from the heading. In cases where this component’s heading may contain sensitive information, use this prop to override what is sent to analytics.

Guidance

When to use

When users need content to remain viewable while also allowing the user to views/interacts with the main page.
When the content is longer than 2 sentences.
When the content needs to be available at a particular point in the process, but doesn't need to be included on the main page.
When the content just needs to be available at the user's discretion, to provide additional details or context.
When users may need additional information to complete the task than can be supplied on the main page without overwhelming the primary content.

When to consider alternatives

When the content is timely/urgent, or critical to the action being taken.
When the content is intended to clarify or call attention to other content on the page.
When the content must be displayed without being initiated by a user action.
When additional information is necessary to the primary information the user is interacting with.

Usage

Link text used to trigger the help drawer should be specific and descriptive.
- Avoid using only "Learn more" to link to help drawer content
- Limit the amount of link text
Drawer content area should include a close button clearly at the top.

Accessibility

Focus should move to the content in the help drawer after the user has opened it.
Drawer should support keyboard navigation.
- Enter and Space to select the highlighted item.
- Tab to move the focus sequentially through the list of focusable items
- Shift + Tab to move the focus sequentially through the list of focusable items in reversed order

Focus Management

The property hasFocusTrap is an available option that will prevent keyboard focus from leaving the confines of the HelpDrawer when enabled.

When the property hasFocusTrap is enabled...

Keyboard focus is trapped within the HelpDrawer component.
Pressing the escape key will close the Drawer.

A focus trap should not be used when it's anticipated that the user will rely on the Drawer as a reference resource for doing something outside of the Drawer. For instance, if the user is completing a form, Drawer may contain a reference guide defining specific requirements.

However, there are times when it makes sense to trap focus within the Drawer. One occassion where it can benefit the user is when the Drawer is anticipated to fill the viewport of a screen, i.e., mobile layout.

Customization

The following Sass variables can be overridden to customize Drawer components:

Variable	Default Core Theme Value
`$drawer__animation-timing`	`0.3s`
`$drawer__background-color`	`$color-white`
`$drawer__border-color`	`$color-border`
`$drawer-close__color`	`$color-black`
`$drawer-header__background-color`	`$color-gray-lightest`
`$drawer-footer__background-color`	`$color-primary-alt-lightest`
`$drawer-toggle__background-color--hover`	`$color-focus-inverse`
`$drawer-toggle__color--hover`	`$color-white`
`$drawer-toggle__background-color--hover--inverse`	`$color-white`
`$drawer-toggle__color--hover--inverse`	`$color-gray-dark`

Future Work

Future design iterations and possible user research to ensure the enhanced help drawer link design isn't confused or mistaken for transitional hyperlinks, glossary terms, or tooltips.

Google Analytics

Google analytics are available via the <HelpDrawer> component.

Analytics event tracking is disabled by default.

Enable event tracking

Import and set the setHelpDrawerSendsAnalytics feature flag to true in your application's entry file:

import { setHelpDrawerSendsAnalytics } from '@cmsgov/<design-system-package>';
setHelpDrawerSendsAnalytics(true);

On application where the page has utag loaded, the data goes to Tealium which allows it to route to Google Analytics or the currently approved data analytics tools.

Disable event tracking

For the analytics prop, pass the value false to the component to disable analytics tracking for a singular component instance

analytics={false}

Override event tracking

A custom heading value can be sent for an analytics event by using the prop analyticsLabelOverride. It is recommended that this value be used to prevent sensitive personal information from being passed to analytics trackers.