Banner
Banners surface important information and feedback to the user about a task, action, or state.
Anatomy
- Icon: Supplementary visual indicator used to distinguish between error and alert Banners.
- Label: Total count of all errors and/or alerts on a page.
- Action Text (Conditional): Link text that indicates the Banner is actionable. Activating the link opens a list of all errors and alerts on a page. Action text is only available in the full Banner variant and has a default value of View All.
- Container: Colored container that houses the error or alert icon, message, and action text. The container can be full or sticky, in which the Banner is to be displayed along the right edge of the page.
Usage Guidance
Banners consist of errors and alerts:
- Typically appearing in response to user action, errors prevent the user from moving forward in their process until the error is corrected. Common error triggers include failing to enter a value for required fields, entering values in a form that are incompatible, or when user input is not understood.
- Alerts convey information the user should be aware of to help prevent a future error, but allow the user to proceed without addressing the alert.
When to Use
- Use Banners to notify users of missteps that happen within a workflow and describe how the user can take appropriate action to resolve them.
- Banners should bring a user’s attention to problems or mistakes either before they happen, or before the user can move on.
When to Use Something Else
- Ideally, a design won’t create a scenario that causes the need for a Banner. If you can avoid these scenarios by mentioning information that will help in hint text, or by simplifying your design, always do so.
Do's and Don'ts
Examples
Basic Example
Use the children of Banner.Label
to set the main text for the Banner
.
Action Text
Use the children of Banner.ActionText
to customize the action text contained in the Banner
. The
text has default value of View All
.
Error Type
Set the hasError
prop of the Banner
to designate the severity of the message presented in the
banner. This will change the defualt icon to exclamationCircleIcon
.
Sticky
Set the isSticky
prop of the Banner
to display it along the right edge of the page. When true,
the Banner.ActionText
will be hidden. Some basic styles will be applied, but you will still need
to manually set the css position
value.
You can use keyframes to animate the Banner
in.
RefForwarding
Banner
supports ref forwarding. It will forward ref to its underlying button element.
Right-to-Left (RTL)
Banner supports right-to-left languages when specified in the CanvasProvider theme.
Themed Banners
Banners use the useThemedPalette
hook for themeing. By default, your alert theme is used. main
will be used for the background, dark
for the hover background, and contrast
for the text.
If you set the hasError
prop, the banner will use your error theme.
Component API
Banner
Usage
Banner
is a container component rendered as a <button>
element that is responsible for creating
a BannerModel
and sharing it with its subcomponents using React context.
<BannerisSticky={true}hasError={true} id:'custom-banner-id'onClick={() => console.log('clicked banner')}>{/* Child components */}</Banner>
Alternatively, you may pass in a model using the hoisted model pattern.
const model = useBannerModel({isSticky: true,hasError: true,id: 'custom-banner-id',});return (<Banner onClick={() => console.log('clicked banner')} model={model}>{/* Child components */}</Banner>);
Props
Undocumented props are spread to the underlying <button>
element.
Name | Type | Default | Description |
---|
If you're using the hoisted model pattern, follow this table instead (refer to the Model
section for more information about BannerModel
):
Name | Type | Default | Description |
---|---|---|---|
model * | BannerModel |
Banner.Icon
Usage
Banner.Icon
is a styled <SystemIcon>
. The icon defaults to exclamationTriangleIcon or
exclamationCircleIcon when the model's hasError is true.
<Banner.Icon />
Props
You can override the default icon if needed.
Undocumented props are spread to the underlying <SystemIcon>
element.
Name | Type | Default | Description |
---|---|---|---|
icon | CanvasSystemIcon | undefined | `exclamationTriangleIcon` or `exclamationCircleIcon` when hasError is true | Icon to show next to label |
Banner.Label
Usage
Banner.Label
is a styled <Flex>
. This component will get an id that will be used for the
aria-describedby on the top level <button>
.
<Banner.Label>3 Warnings</Banner.Label>
Props
The children prop will be used as the Primary text of the Banner.
Undocumented props are spread to the underlying <Flex>
element.
Name | Type | Default | Description |
---|---|---|---|
children * | ReactNode | The text of the Banner. |
Banner.ActionText
Usage
Banner.ActionText
is a styled <Box>
. This component will get an id that will be used for the
aria-labelledby on the top level <button>
. This component will be visually hidden when the model's
isSticky
prop is set to true.
<Banner.ActionText>Custom call to action</Banner.ActionText>
Props
The children prop will be used as the 'call to action' text of the Banner.
Undocumented props are spread to the underlying <Box>
element.
Name | Type | Default | Description |
---|---|---|---|
children | ReactNode | 'View All' | The text of the Banner action. |
Model
If Banner
was stripped of all its markup, attributes, and styling, what would remain is the
model. The model is an
object that holds the state
, i.e. a description of the current snapshot in time of the component.
By default, Banner
will create a model and share it internally with its subcomponents using React
context. You may subscribe to BannerContext
if you wish to create a custom subcomponent for your
implementation. Here's a simple example.
import * as React from 'react';import {Banner, BannerModelContext} from '@workday/canvas-kit-react/banner';const CustomText = (props: React.HTMLAttributes<HTMLSpanElement>) => {const model = React.useContext(BannerModelContext);return <span {...props}>{model.state.hasError ? 'Error:' : 'Warning:'}</span>;};export const CustomBanner = () => {return (<Banner><CustomText />{/* Other subcomponents */}</Banner>);};
Alternatively, if you need direct access to the model's state
outside of the Banner
component,
you may configure your own model with useBannerModel
and pass it to Banner
via a pattern called
hoisting the model.
const model = useBannerModel({isError: true,});<Banner model={model}>{/* Child components */}</Banner>;
Config
useBannerModel
accepts a configuration object with the following properties and returns a
BannerModel
with a state
property.
Name | Type | Default | Description |
---|
Accessibility Guidelines
- Avoid using color alone to differentiate between errors and alerts. Instead, use icons or text that says “Error” or “Alert.”
- If both icons and visible text are used to differentiate between errors and alerts, the icons are considered redundant and should not provide any alternative text for screen readers.
- When possible, error and alert states should provide information on how to fix issues or hints on fixing formatting.
Content Guidelines
- When writing error or alert messages, refer to the Errors and Alerts section of the Content Style Guide.
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FAQ Section