An <sp-meter> is a visual representation of a quantity or achievement. The meter's progress is determined by user actions, rather than system actions.
yarn add @spectrum-web-components/meterImport the side-effectful registration of <sp-meter> via:
import '@spectrum-web-components/meter/sp-meter.js';When looking to leverage the Meter base class as a type and/or for extension purposes, do so via:
import { Meter } from '@spectrum-web-components/meter';The meter consists of several key parts:
- A label that describes what is being measured
- A progress track showing the total possible range
- A fill bar indicating the current progress
- A percentage value showing the numeric progress
<sp-meter progress="71">Tasks Completed</sp-meter>The label is the text that describes what is being measured. It can be provided either through the default slot or the label attribute.
<sp-meter progress="15">Course Progress</sp-meter>
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<sp-meter progress="15" label="Course Progress"></sp-meter><sp-meter size="s" progress="25">Tasks Completed</sp-meter><sp-meter size="m" progress="25">Tasks Completed</sp-meter><sp-meter size="l" progress="25">Tasks Completed</sp-meter><sp-meter size="xl" progress="25">Tasks Completed</sp-meter>The meter supports several variants to convey different semantic meanings:
InformativeBy default, the informative variant can be used to represent a neutral or non-semantic value, such as the number of tutorials completed.
<sp-meter progress="50">Storage Space</sp-meter>The positive variant can be used to represent a positive semantic value, such as when there's a lot of space remaining.
Use value variant="positive" to define a positive variant.
<sp-meter variant="positive" progress="50">Storage Space</sp-meter>The notice variant can be used to warn users about a situation that may need to be addressed soon, such as when space remaining is becoming limited.
Use value variant="notice" to define a notice variant.
<sp-meter variant="notice" progress="73">Storage Space</sp-meter>The negative variant can be used to warn users about a critical situation that needs their urgent attention, such as when space remaining is becoming very limited.
Use value variant="negative" to define a negative variant.
<sp-meter variant="negative" progress="92">Storage Space</sp-meter>A meter 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.
<sp-meter side-label progress="68">Side Label</sp-meter>The <sp-meter> element is rendered with role="meter progressbar" to ensure proper semantics for assistive technologies. The current progress value is set as a percentager via the progress attribute and is exposed to assistive technology via aria-valuenow.
<sp-meter progress="71" label="Download Progress">Download Progress</sp-meter>A meter is required to have either a visible text label or a label attribute.
The meter's variants provide semantic meaning through both color and ARIA attributes, ensuring that information is not conveyed through color alone. The progress track and fill maintain sufficient contrast for visibility.