Description
An <sp-progress-circle>
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-circle
Import the side effectful registration of <sp-progress-circle>
via:
import '@spectrum-web-components/progress-circle/sp-progress-circle.js';
When looking to leverage the ProgressCircle
base class as a type and/or for extension purposes, do so via:
import { ProgressCircle } from '@spectrum-web-components/progress-circle';
Variants
Default
An <sp-progress-circle>
is used to visually show the progression of a system operation such as downloading, uploading, processing, etc.
<div
style="width: 250px; height: 150px; display: flex; align-items: center; justify-content: space-around;"
>
<sp-progress-circle
label="A small representation of a somewhat completed action"
progress="71"
size="s"
></sp-progress-circle>
<sp-progress-circle
label="A medium representation of a recently started action"
progress="22"
></sp-progress-circle>
<sp-progress-circle
label="A large representation of an almost completed action"
progress="86"
size="l"
></sp-progress-circle>
</div>
Static
If you display your <sp-progress-cicle>
element over the top of other content, e.g. an image or an alternate background color, it may become appropariate to update the colors with which the circle and loading progress indicator are delivered. To do this, leverage the static
attribute with the value of white
to ensure the content of your page is being delivered accessibly.
<div
style="width: 250px; height: 150px; display: flex; align-items: center; justify-content: space-around; background-color: rgba(0,0,0,0.4);"
>
<sp-progress-circle
label="A small representation of a partially completed action"
progress="42"
static="white"
size="s"
></sp-progress-circle>
<sp-progress-circle
label="A medium representation of a barely started action"
progress="7"
static="white"
></sp-progress-circle>
<sp-progress-circle
label="A large representation of a somewhat completed action"
progress="68"
static="white"
size="l"
></sp-progress-circle>
</div>
Indeterminate
A progress circle 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: 250px; height: 150px; display: flex; align-items: center; justify-content: space-around;"
>
<sp-progress-circle
label="A small representation of an unclear amount of work"
indeterminate
size="s"
></sp-progress-circle>
<sp-progress-circle
label="A medium representation of an unclear amount of work"
indeterminate
></sp-progress-circle>
<sp-progress-circle
label="A large representation of an unclear amount of work"
indeterminate
size="l"
></sp-progress-circle>
</div>
Size
Progress Circles come in 3 sizes: small ([size="s"]
), medium ([size="m"]
, default), or large ([size="l"]
). These are available to fit various contexts. For example, the small loader can be used in place of an icon or in tight spaces, while the large one can be used for full-page loading.
Accessibility
An sp-progress-circle
element will register itself as a role="progressbar"
element in the accessibility tree. Any value applied to the label
attribute will be set as the aria-label
attribute on the host. These two attributes can be used interchangably to ensure that the sp-progress-circle
elements in your UI correctly fulfills its responsibilities to visitors of you site of all abilities.