Side Panel

Anatomy

1. Tooltip (Required if using Expand/Collapse Button): Tooltip used to provide additional visual affordance for the Expand/Collapse Button.
2. Expand/Collapse Button (Optional): Icon only Tertiary Button variant used to open or close the Side Panel.
3. Container: Rectangular container that houses the contents of the Side Panel. The container spans the full height of the viewport and are flush to the left or right edge of the screen.

Usage Guidance

• Side Panels can either push and resize content as it expands within a page or float over page content. See the Expandable pattern (coming soon!) for more detailed information on horizontal animation.
• When the content of the Side Panel exceeds the height of the viewport, overflow behavior such as a scrollbar is introduced. Refer to the Overflow pattern for more information.
• Consider the behavior of Side Panels at different responsive breakpoints and in different use cases. In use cases where the Side Panel is used to edit content within the page, keeping the Side Panel open and resizing the page content may be ideal. For use cases where a Side Panel is not required to remain open, enabling a Side Panel to automatically collapse when it reaches smaller screen sizes will prevent the panel from taking up too much of the screen until the user wants to take action on it.
• When using the Expand/Collapse Button within the Side Panel, use a Tooltip to provide additional affordance that the icon is interactive and to improve accessibility for the Side Panel. When the Side Panel is expanded, tooltip text reads "Collapse" and collapsed, the tooltip reads "Expand."

When to Use

Although the elements within a Side Panel are highly configurable to support various use cases, they are commonly used in the following ways:

Local Page Navigation

• Provides users with a way to navigate within an area of your product.
• Typically tied to the main content region.
• Often collapsible but not closable, meaning the Panel remains on the page and cannot be dismissed.

Editing and Displaying Additional Information

• Ideal for editing specific content within the page or displaying additional information that supports the main content area.
• Can be temporary, meaning the Panel may disappear when the associated content on the main page is no longer in focus.

Panel Overlays

• When Panels open over an overlay, the user cannot interact with the main page. The overlay helps users focus attention on the contents of the Panel, making it ideal for higher-level navigation and editing or displaying additional information while minimizing distractions.
• A Side Panel that opens over an overlay has a close Button but not a collapse. Activating the Button closes the Panel and the Overlay so the user can return focus to the main page.

Do's and Don'ts

Examples

Basic Example

SidePanel is composed of three parts:

• The panel container
• An accessible name (either on a visible element or hidden)
• A toggle button to control the expand / collapse states

Bidirectional support is built into SidePanel. As seen in the example below, CSS Flexbox flips the page layout and the panel's contents. SidePanel also has logic to flip the position and direction of the ToggleButton as well as the direction of the expand / collapse animation. If you're using CSS Flexbox for layouts and using the provided components, you shouldn't have to provide any custom logic or styling for bidirecitonal support.

Hidden Name

SidePanel should always have an accessible label. Often this is the heading element with an id attribute. However, as seen in the example below, you can apply a hidden attribute to your label if you do not want it to be visible.

Alternate Variant

SidePanel has one variant, alternate, which you can supply as a top-level prop. Default depth of alternate variant is 5, if alternate SidePanel has an overlay behavior the depth 6 should be used (this case is covered in the Examples section).

External Control

Sometimes you'll want to control SidePanel's' expand / collapse behavior from outside the component. In that case, you can use the controlProps supplied by the useSidePanel hook.

Right Origin

By default, SidePanel uses a left origin. This sets the ToggleButton's position and direction as well as the direction of the animation. But you can set SidePanel's origin to "right" to flip these. As with the left-origin panel, all right-origin styles have bidirecitonal support.

Always Open

If you do not need SidePanel's' expand / collapse behavior, you can simply omit the controlProps and ToggleButton.

The majority of SidePanel's logic and funcitonality lives in this container component. Most of this functionality has been described in the examples above, but there a couple specific callbacks worth mentioning here.

onExpandedChange

The onExpandedChange callback is called when the boolean expanded state is updated. This is a handy way to hook into these updates to trigger side-effects. Below is an example:

onStateTransition

While onExpandedChange works well for discrete boolean state changes, there may be occasions where you also need transition states. In these situations, onStateTransition is a better fit. This callback it called on all state transitions and returns the current transtion state. This can be one of four SidePanelTransitionStates, expanding, expanded, collapsing, and collapsed. Below is an example:

Component API

Hooks

useSidePanel

import {useSidePanel} from '@workday/canvas-kit-preview-react/side-panel';

const {expanded, setExpanded, panelProps, labelProps, controlProps} = useSidePanel({
  initialExpanded: false,
  panelId: 'custom-panel-id',
  labelId: 'custom-label-id',
});

Specifications

Accessibility Guidelines

• Each Panel requires a unique, human-readable accessible name to allow a screen reader user to perceive and understand how the Panel sits within the context of your page.
• Consider using visually hidden live region announcements to help a screen reader user understand if the Panel is expanded or collapsed when the toggle control is pressed.
• Supplement interactive non-text based icons with custom tooltips to reveal their labels both on mouse hover and keyboard focus.
• All text content must have a minimum contrast ratio of 4.5:1 with its background colour.
• Important non-text content (including individual states) must have a minimum contrast ratio of 3:1 with their adjacent background.