State Panel

State panels replace a content region when there is nothing to show or the intended content cannot be rendered. Use an Alert instead when the surrounding interface remains usable and the message is supplementary.

Empty States

Use the default empty variant for a valid absence of content. Explain what is missing and, when useful, place the next step in the actions slot.

Variants

The variant communicates why the content region was replaced. empty is the default for a valid absence of content. Use info for explanatory states, success for a completed outcome, warning when the person should review something, and error when the intended content failed. Each variant sets the semantic colour and fallback icon.

Icons

Set icon to a name registered through the Icon registry when a state needs a more specific glyph. For fully custom rendered content, including an inline SVG, use the icon slot; the slot takes precedence over the icon property. Use hide-icon when the heading and message are sufficient without one.

Sizes

Use the default size for ordinary panels and slide-outs. sm provides a compact replacement state for smaller regions, while lg suits a prominent content region. The size scales the icon, type, spacing, details, copy controls, and default-sized action buttons together.

Error States and Details

Use the error variant when the panel replaces content that failed to load or render. Technical information belongs in the details slot, while the default slot stays safe and useful for the person using the interface. Set copyable to add a compact copy button inside the details area. Its icon changes to a check after success, the result is announced, and failures remain visibly explained.

Scrolling Details

Large diagnostic output scrolls once it reaches the details area's maximum height. The copy control remains inset within the scrolling content, so a native scrollbar only affects its alignment when one is present.

Use announce="polite" for an asynchronous state change that can wait and announce="assertive" only for an urgent failure. Static states should keep the default announce="off" value.

API

Slots

Name	Description
title	Custom heading content. Takes precedence over the heading property.
icon	Custom icon. The component supplies a variant icon by default.
(default)	State description or other primary content.
details	Optional content inside the collapsible details region.
actions	Optional buttons or links.

Attributes & Properties

Name	Description
announce	Type PkStatePanelAnnouncement Default off
copiedLabel copied-label	Type string Default Details copied.
copyable	Type boolean Default false
copyErrorLabel copy-error-label	Type string Default Copy failed. Select the details and copy them manually.
copyLabel copy-label	Type string Default Copy details
detailsLabel details-label	Type string Default Details
detailsOpen details-open	Type boolean Default false
heading	Type string
headingLevel heading-level	Type PkStatePanelHeadingLevel Default 2
hideIcon hide-icon	Type boolean Default false
icon	Registered icon name. A custom icon slot takes precedence. Type string
size	Overall density, including typography, icons, spacing, details, and actions. Type PkStatePanelSize Default default
variant	Semantic colour and fallback icon for the replacement state. Type PkStatePanelVariant Default empty

Methods

Name	Description
copyDetails()	Copy the plain text assigned to the details slot.

Events

Name	Description
pk-copy	Emitted when the details are copied successfully.
pk-copy-error	Emitted when the details cannot be copied.

CSS Custom Properties

Name	Description
--pk-state-panel-accent	Variant accent colour.
--pk-state-panel-body-color	Primary content colour.
--pk-state-panel-content-width	Maximum content width.
--pk-state-panel-details-max-height	Maximum height of diagnostic details.
--pk-state-panel-icon-background	Icon container background.
--pk-state-panel-icon-radius	Icon container radius.
--pk-state-panel-icon-shell-size	Icon container width and height.
--pk-state-panel-icon-size	Icon width and height.
--pk-state-panel-min-height	Minimum component height.
--pk-state-panel-padding	Component padding.
--pk-state-panel-title-color	Heading colour.
--pk-state-panel-title-size	Heading font size.

CSS Parts

Name	Description	CSS selector
actions	Actions wrapper.	::part(actions)
base	Centered state container.	::part(base)
body	Default content wrapper.	::part(body)
copy-button	Copy-details button.	::part(copy-button)
copy-status	Copy result status.	::part(copy-status)
details	Collapsible details element.	::part(details)
details-content	Details content wrapper.	::part(details-content)
details-summary	Details disclosure label.	::part(details-summary)
icon	Icon wrapper.	::part(icon)
icon-shell	Icon background container.	::part(icon-shell)
title	State heading.	::part(title)

Dependencies

This component registers the following elements when it loads.

Name	Description
pk-copy-button	Compact copy-details action.
pk-icon	—