@spectrum-web-components/progress-bar v0.42.2
Description
An <sp-progress-bar>
shows the progression of a system operation such as downloading, uploading, processing, etc. in a visual way. It can represent determinate or indeterminate progress.
Usage
yarn add @spectrum-web-components/progress-bar
Import the side effectful registration of <sp-progress-bar>
via:
import '@spectrum-web-components/progress-bar/sp-progress-bar.js';
When looking to leverage the ProgressBar
base class as a type and/or for extension purposes, do so via:
import { ProgressBar } from '@spectrum-web-components/progress-bar';
Sizes
<div
style="width: 240px; height: 160px; display: flex; flex-direction: column; align-items: center; justify-content: space-around;"
>
<sp-progress-bar
size="s"
label="Loaded a little"
progress="22"
></sp-progress-bar>
</div>
<div
style="width: 240px; height: 160px; display: flex; flex-direction: column; align-items: center; justify-content: space-around;"
>
<sp-progress-bar
size="m"
label="Loaded a little"
progress="22"
></sp-progress-bar>
</div>
<div
style="width: 240px; height: 160px; display: flex; flex-direction: column; align-items: center; justify-content: space-around;"
>
<sp-progress-bar
size="l"
label="Loaded a little"
progress="22"
></sp-progress-bar>
</div>
<div
style="width: 240px; height: 160px; display: flex; flex-direction: column; align-items: center; justify-content: space-around;"
>
<sp-progress-bar
size="xl"
label="Loaded a little"
progress="22"
></sp-progress-bar>
</div>
Variants
Over background
When a progress bar needs to be placed on top of a colored background, use the over background progres bar as signified by [over-background]
. This progress bar uses a white opaque color no matter the background. Make sure the background offers enough contrast for the loader to be legible.
<div
style="width: 240px; height: 160px; display: flex; flex-direction: column; align-items: center; justify-content: space-around; background-color: var(--spectrum-transparent-black-400);"
>
<sp-progress-bar
label="Loaded a large amount"
progress="77"
over-background
></sp-progress-bar>
</div>
Indeterminate
A progress bar can be either determinate or indeterminate as signified by [indeterminate]
. By default, loaders are determinate. Use a determinate loader when progress can be calculated against a specific goal (e.g., downloading a file of a known size). Use an indeterminate loader when progress is happening but the time or effort to completion can’t be determined (e.g., attempting to reconnect to a server).
<div
style="width: 240px; height: 160px; display: flex; flex-direction: column; align-items: center; justify-content: space-around;"
>
<sp-progress-bar
aria-label="Loaded an unclear amount"
indeterminate
></sp-progress-bar>
</div>
The above sp-progress-bar
also leverages the aria-label
attribute in place of the label
attribute in ensure that the element is labelled correctly without that label appearing visibly in the UI.
Side Label
A progress bar can be delivered with its labeling displayed above its visual indicator or to either side. Use the boolean [side-label]
attribute to define where this content should appear.
<div
style="width: 240px; height: 160px; display: flex; flex-direction: column; align-items: center; justify-content: space-around;"
>
<sp-progress-bar
side-label
indeterminate
label="Label Beside"
></sp-progress-bar>
</div>
Accessibility
An sp-progress-bar
element will register itself as a role="progressbar"
element in the accessibility tree. Any value applied to the label
attribute will be used both to visibly label the element and to set the aria-label
attribute on the host. In cases where a visible label is not desired, be sure to include an aria-label
attribute manually to ensure that the sp-progress-bar
correctly fulfills its responsibilities to visitors of you site of all abilities.
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