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<action-list>
<div data-view-component="true">
<ul aria-label="List heading" id="action-list-b3750789-a1dc-4703-a116-fc3ef101237a" role="list" data-view-component="true" class="ActionListWrap">
<li data-targets="action-list.items" data-view-component="true" class="ActionListItem--danger ActionListItem">
<a id="item-2af4e9bb-6ae2-426e-a6c1-181a697d75aa" href="/" data-view-component="true" class="ActionListContent">
<span data-view-component="true" class="ActionListItem-label">
Danger item
</span>
</a>
</li>
</ul>
</div>
</action-list>
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render(Primer::Alpha::ActionList.new(
aria: { label: "List heading" }
)) do |component|
component.with_item(label: "Danger item", href: "/", scheme: :danger)
end

app/components/primer/alpha/action_list.css

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/* stylelint-disable selector-max-compound-selectors */
/* stylelint-disable selector-max-specificity */
/* stylelint-disable max-nesting-depth */
:root {
--actionListContent-paddingBlock: var(--control-medium-paddingBlock);
}
/* ActionList */
/* stylelint-disable-next-line selector-max-type */
action-list {
display: block;
}
/* stylelint-disable-next-line selector-max-type */
nav-list {
display: block;
}
.ActionListHeader {
margin-bottom: var(--base-size-16);
margin-left: var(--base-size-8);
}
/* <ul> */
.ActionListWrap {
list-style: none;
}
.ActionListWrap--inset,
.ActionListWrap--inset[popover] {
padding: var(--base-size-8);
}
/* list dividers */
.ActionListWrap--divided .ActionListItem-label::before {
position: absolute;
/* stylelint-disable-next-line primer/spacing */
top: calc(-1 * var(--actionListContent-paddingBlock));
display: block;
width: 100%;
height: 1px;
content: '';
/* stylelint-disable-next-line primer/colors */
background: var(--borderColor-muted);
}
/* if descriptionWrap--inline exists, move pseudo divider to wrapper */
:is(.ActionListWrap--divided .ActionListItem-descriptionWrap--inline)::before {
position: absolute;
/* stylelint-disable-next-line primer/spacing */
top: calc(-1 * var(--actionListContent-paddingBlock));
display: block;
width: 100%;
height: var(--borderWidth-thin);
content: '';
/* stylelint-disable-next-line primer/colors */
background: var(--borderColor-muted);
}
/* unset the default label pseudo */
:is(.ActionListWrap--divided .ActionListItem-descriptionWrap--inline) .ActionListItem-label::before {
content: unset;
}
/* hide divider if item is active */
:is(.ActionListWrap--divided .ActionListItem--navActive) .ActionListItem-label::before,:is(.ActionListWrap--divided .ActionListItem--navActive) + .ActionListItem .ActionListItem-label::before {
visibility: hidden;
}
/* hide if item is first of type with label::before, or is the first item after a sectionDivider */
.ActionListItem:first-of-type .ActionListItem-label::before,
.ActionList-sectionDivider + .ActionListItem .ActionListItem-label::before {
visibility: hidden;
}
/* hide if item is first of type with label::before, or is the first item after a sectionDivider */
.ActionListItem:first-of-type .ActionListItem-descriptionWrap--inline::before,
.ActionList-sectionDivider + .ActionListItem .ActionListItem-descriptionWrap--inline::before {
visibility: hidden;
}
/* ActionList::Item */
.ActionListItem {
position: relative;
list-style: none;
background-color: var(--control-transparent-bgColor-rest);
border-radius: var(--borderRadius-medium);
/* state */
}
.ActionListItem:hover,.ActionListItem:active {
cursor: pointer;
}
/* hide dividers */
@media (hover: hover) {
.ActionListItem:hover .ActionListItem-label::before,.ActionListItem:hover + .ActionListItem .ActionListItem-label::before {
visibility: hidden;
}
.ActionListItem:hover .ActionListItem-descriptionWrap--inline::before,.ActionListItem:hover + .ActionListItem .ActionListItem-descriptionWrap--inline::before {
visibility: hidden;
}
}
/* Make sure that the first visible item isn't a divider */
.ActionListItem[hidden] + .ActionList-sectionDivider {
display: none;
}
/* collapse styles here */
/* first child */
.ActionListItem.ActionListItem--hasSubItem > .ActionListContent {
z-index: 1;
}
@media (hover: hover) {
:is(.ActionListItem.ActionListItem--hasSubItem > .ActionListContent):hover {
background-color: var(--control-transparent-bgColor-hover);
}
}
:is(.ActionListItem.ActionListItem--hasSubItem > .ActionListContent):active {
background-color: var(--control-transparent-bgColor-active);
}
/* only hover li without list as children */
@media (hover: hover) {
:is(.ActionListItem:not(.ActionListItem--hasSubItem),.ActionListItem.ActionListItem--hasSubItem > .ActionListContent):hover {
cursor: pointer;
background-color: var(--control-transparent-bgColor-hover);
}
:is(.ActionListItem:not(.ActionListItem--hasSubItem),.ActionListItem.ActionListItem--hasSubItem > .ActionListContent):hover:not(.ActionListItem--navActive,:focus-visible) {
/* Support for "Windows high contrast mode" */
outline: solid var(--borderWidth-thin) transparent;
outline-offset: calc(-1 * var(--borderWidth-thin));
box-shadow: var(--boxShadow-thin) var(--control-transparent-borderColor-active);
}
}
:is(.ActionListItem:not(.ActionListItem--hasSubItem),.ActionListItem.ActionListItem--hasSubItem > .ActionListContent):active {
background: var(--control-transparent-bgColor-active);
}
:is(.ActionListItem:not(.ActionListItem--hasSubItem),.ActionListItem.ActionListItem--hasSubItem > .ActionListContent):active:not(.ActionListItem--navActive) {
/* Support for "Windows high contrast mode" https:sarahmhigley.com/writing/whcm-quick-tips/ */
outline: solid var(--borderWidth-thin) transparent;
outline-offset: calc(-1 * var(--borderWidth-thin));
box-shadow: var(--boxShadow-thin) var(--control-transparent-borderColor-active);
}
:is(.ActionListItem:not(.ActionListItem--hasSubItem),.ActionListItem.ActionListItem--hasSubItem > .ActionListContent):active .ActionListItem-label::before,:is(.ActionListItem:not(.ActionListItem--hasSubItem),.ActionListItem.ActionListItem--hasSubItem > .ActionListContent):active + .ActionListItem .ActionListItem-label::before {
visibility: hidden;
}
/* Autocomplete [aria-selected] items */
.ActionListItem[aria-selected='true'] {
font-weight: var(--base-text-weight-normal);
background: var(--control-transparent-bgColor-selected);
}
@media (hover: hover) {
.ActionListItem[aria-selected='true']:hover {
background-color: var(--control-transparent-bgColor-hover);
}
}
.ActionListItem[aria-selected='true']::before,.ActionListItem[aria-selected='true'] + .ActionListItem::before {
visibility: hidden;
}
/* blue accent line */
.ActionListItem[aria-selected='true']::after {
position: absolute;
top: calc(50% - 12px);
left: calc(-1 * var(--base-size-4));
width: var(--base-size-4);
height: var(--base-size-24);
content: '';
background: var(--borderColor-accent-emphasis);
border-radius: var(--borderRadius-medium);
}
/* active state [aria-current] */
.ActionListItem.ActionListItem--navActive {
/* provides a visual indication of the current item for Windows high-contrast mode */
outline: 2px solid transparent;
}
.ActionListItem.ActionListItem--navActive:not(.ActionListItem--subItem) .ActionListItem-label {
font-weight: var(--base-text-weight-semibold);
}
.ActionListItem.ActionListItem--navActive:not(.ActionListItem--danger) {
background: var(--control-transparent-bgColor-selected);
}
@media (hover: hover) {
.ActionListItem.ActionListItem--navActive:not(.ActionListItem--danger):hover {
background-color: var(--control-transparent-bgColor-hover);
}
}
.ActionListItem.ActionListItem--navActive:not(.ActionListItem--danger)::before,.ActionListItem.ActionListItem--navActive:not(.ActionListItem--danger) + .ActionListItem::before {
visibility: hidden;
}
/* blue accent line */
.ActionListItem.ActionListItem--navActive:not(.ActionListItem--danger)::after {
position: absolute;
top: calc(50% - 12px);
left: calc(-1 * var(--base-size-8));
width: var(--base-size-4);
height: var(--base-size-24);
content: '';
background: var(--borderColor-accent-emphasis);
border-radius: var(--borderRadius-medium);
}
/* disabled */
:is(:is(.ActionListItem.ActionListItem--disabled,.ActionListItem[aria-disabled='true']) .ActionListContent) .ActionListItem-label,:is(:is(.ActionListItem.ActionListItem--disabled,.ActionListItem[aria-disabled='true']) .ActionListContent) .ActionListItem-description {
color: var(--control-fgColor-disabled);
}
:is(:is(.ActionListItem.ActionListItem--disabled,.ActionListItem[aria-disabled='true']) .ActionListContent) .ActionListItem-visual {
fill: var(--control-fgColor-disabled);
}
@media (hover: hover) {
:is(.ActionListItem.ActionListItem--disabled,.ActionListItem[aria-disabled='true']):hover {
cursor: not-allowed;
background-color: transparent;
}
}
/* variants */
/* danger */
.ActionListItem.ActionListItem--danger .ActionListItem-label {
color: var(--control-danger-fgColor-rest);
}
.ActionListItem.ActionListItem--danger .ActionListItem-visual {
color: var(--control-danger-fgColor-rest);
}
@media (hover: hover) {
.ActionListItem.ActionListItem--danger:hover {
background: var(--control-danger-bgColor-hover);
}
.ActionListItem.ActionListItem--danger:hover .ActionListItem-label,.ActionListItem.ActionListItem--danger:hover .ActionListItem-visual,.ActionListItem.ActionListItem--danger:hover .ActionListItem-description {
color: var(--control-danger-fgColor-hover);
}
}
:is(.ActionListItem.ActionListItem--danger .ActionListContent):active {
background: var(--control-danger-bgColor-active);
}
:is(.ActionListItem.ActionListItem--danger .ActionListContent):active .ActionListItem-label,:is(.ActionListItem.ActionListItem--danger .ActionListContent):active .ActionListItem-visual,:is(.ActionListItem.ActionListItem--danger .ActionListContent):active .ActionListItem-description {
color: var(--control-danger-fgColor-hover);
}
/* button or a href */
.ActionListContent {
position: relative;
display: grid;
width: 100%;
/* stylelint-disable-next-line primer/spacing */
padding-block: var(--actionListContent-paddingBlock);
/* stylelint-disable-next-line primer/spacing */
padding-inline: var(--control-medium-paddingInline-condensed);
color: var(--control-fgColor-rest);
text-align: left;
-webkit-user-select: none;
user-select: none;
background-color: transparent;
border: none;
border-radius: var(--borderRadius-medium);
transition: background 33.333ms linear;
touch-action: manipulation;
-webkit-tap-highlight-color: transparent;
grid-template-rows: min-content;
grid-template-areas: 'leadingAction leadingVisual label trailingVisual trailingAction';
grid-template-columns: min-content min-content minmax(0, auto) min-content min-content;
align-items: start;
/* column-gap persists with empty grid-areas, margin applies only when children exist */
}
.ActionListContent > :not(:last-child) {
/* stylelint-disable-next-line primer/spacing */
margin-right: var(--control-medium-gap);
}
/* state */
.ActionListContent:hover {
-webkit-text-decoration: none;
text-decoration: none;
}
/* disabled */
.ActionListContent[aria-disabled='true'] .ActionListItem-label,.ActionListContent[aria-disabled='true'] .ActionListItem-description {
color: var(--control-fgColor-disabled);
}
.ActionListContent[aria-disabled='true'] .ActionListItem-visual {
fill: var(--control-fgColor-disabled);
}
@media (hover: hover) {
.ActionListContent[aria-disabled='true']:hover {
cursor: not-allowed;
background-color: transparent;
}
}
/* collapsible item [aria-expanded] */
/* nesting (single level)
target items inside expanded subgroups */
@media screen and (prefers-reduced-motion: no-preference) {
.ActionListContent[aria-expanded] + .ActionList--subGroup {
transition:
opacity 160ms cubic-bezier(0.25, 1, 0.5, 1),
transform 160ms cubic-bezier(0.25, 1, 0.5, 1);
}
}
:is(.ActionListContent[aria-expanded] + .ActionList--subGroup) .ActionListContent {
padding-left: var(--base-size-24);
}
/* has 16px leading visual */
:is(.ActionListContent.ActionListContent--visual16[aria-expanded] + .ActionList--subGroup) .ActionListContent {
padding-left: var(--base-size-32);
}
/* has 20px leading visual */
:is(.ActionListContent.ActionListContent--visual20[aria-expanded] + .ActionList--subGroup) .ActionListContent {
padding-left: var(--base-size-36);
}
/* has 24px leading visual */
:is(.ActionListContent.ActionListContent--visual24[aria-expanded] + .ActionList--subGroup) .ActionListContent {
padding-left: var(--base-size-40);
}
.ActionListContent[aria-expanded='true'] .ActionListItem-collapseIcon {
transition: transform 120ms linear;
transform: scaleY(-1);
}
.ActionListContent[aria-expanded='true'] + .ActionList--subGroup {
height: auto;
overflow: visible;
visibility: visible;
opacity: 1;
transform: translateY(0);
}
.ActionListContent.ActionListContent--hasActiveSubItem[aria-expanded='true'] > .ActionListItem-label {
font-weight: var(--base-text-weight-semibold);
}
.ActionListContent[aria-expanded='false'] .ActionListItem-collapseIcon {
transition: transform 120ms linear;
transform: scaleY(1);
}
.ActionListContent[aria-expanded='false'] + .ActionList--subGroup {
height: 0;
overflow: hidden;
visibility: hidden;
opacity: 0;
transform: translateY(calc(-1 * var(--base-size-16)));
}
/* show active indicator on parent collapse if child is active */
.ActionListContent.ActionListContent--hasActiveSubItem[aria-expanded='false'] {
background: var(--control-transparent-bgColor-selected);
}
.ActionListContent.ActionListContent--hasActiveSubItem[aria-expanded='false'] .ActionListItem-label {
font-weight: var(--base-text-weight-semibold);
}
.ActionListContent.ActionListContent--hasActiveSubItem[aria-expanded='false']::before,.ActionListContent.ActionListContent--hasActiveSubItem[aria-expanded='false'] + .ActionListItem::before {
visibility: hidden;
}
/* blue accent line */
.ActionListContent.ActionListContent--hasActiveSubItem[aria-expanded='false']::after {
position: absolute;
top: calc(50% - 12px);
left: calc(-1 * var(--base-size-8));
width: var(--base-size-4);
height: var(--base-size-24);
content: '';
background: var(--borderColor-accent-emphasis);
border-radius: var(--borderRadius-medium);
}
/*
* checkbox item [aria-checked]
* listbox [aria-selected]
*/
/* multiselect checkmark */
:is(.ActionListContent[aria-checked='true'],.ActionListContent[aria-selected='true']) .ActionListItem-multiSelectCheckmark {
visibility: visible;
opacity: 1;
transition:
visibility 0 linear 0,
opacity 50ms;
}
/* singleselect checkmark */
:is(.ActionListContent[aria-checked='true'],.ActionListContent[aria-selected='true']) .ActionListItem-singleSelectCheckmark {
visibility: visible;
}
/* checkbox */
:is(:is(.ActionListContent[aria-checked='true'],.ActionListContent[aria-selected='true']) .ActionListItem-multiSelectIcon) .ActionListItem-multiSelectIconRect {
fill: var(--control-checked-bgColor-rest);
stroke: var(--control-checked-bgColor-rest);
stroke-width: var(--borderWidth-thin, 1px);
}
:is(:is(.ActionListContent[aria-checked='true'],.ActionListContent[aria-selected='true']) .ActionListItem-multiSelectIcon) .ActionListItem-multiSelectCheckmark {
fill: var(--fgColor-onEmphasis);
}
/* multiselect checkmark */
:is(.ActionListContent[aria-checked='false'],.ActionListContent[aria-selected='false']) .ActionListItem-multiSelectCheckmark {
visibility: hidden;
opacity: 0;
transition:
visibility 0 linear 50ms,
opacity 50ms;
}
/* singleselect checkmark */
:is(.ActionListContent[aria-checked='false'],.ActionListContent[aria-selected='false']) .ActionListItem-singleSelectCheckmark {
visibility: hidden;
transition: visibility 0s linear 200ms;
}
/* checkbox */
:is(:is(.ActionListContent[aria-checked='false'],.ActionListContent[aria-selected='false']) .ActionListItem-multiSelectIcon) .ActionListItem-multiSelectIconRect {
fill: var(--bgColor-default);
stroke: var(--control-borderColor-rest);
stroke-width: var(--borderWidth-thin, 1px);
}
:is(.ActionListContent[aria-checked='false'],.ActionListContent[aria-selected='false']) .ActionListItem-multiSelectIconRect {
fill: var(--bgColor-default);
border: var(--borderWidth-thin) solid var(--control-borderColor-rest);
}
/* sizes */
.ActionListContent.ActionListContent--sizeLarge {
--actionListContent-paddingBlock: var(--control-large-paddingBlock);
}
.ActionListContent.ActionListContent--sizeXLarge {
--actionListContent-paddingBlock: var(--control-xlarge-paddingBlock);
}
/* On pointer:coarse (mobile), all list items are large */
@media (pointer: coarse) {
.ActionListContent {
--actionListContent-paddingBlock: var(--control-large-paddingBlock);
}
}
/* if leading/trailing visual, align with first line of content */
.ActionListContent.ActionListContent--blockDescription .ActionListItem-visual {
place-self: start;
}
/* place children on grid */
.ActionListItem-action--leading {
grid-area: leadingAction;
}
.ActionListItem-visual--leading {
grid-area: leadingVisual;
}
.ActionListItem-visual--trailing {
grid-area: trailingVisual;
}
.ActionListItem-action--trailing {
grid-area: trailingAction;
}
/* have leading visual svg filled with chosen color */
/* stylelint-disable-next-line selector-max-type */
.ActionListItem-visual--leading svg {
fill: currentcolor;
}
/* wrapper span
default block */
.ActionListItem-descriptionWrap {
grid-area: label;
display: flex;
flex-direction: column;
gap: var(--base-size-4);
}
.ActionListItem-descriptionWrap .ActionListItem-label {
font-weight: var(--base-text-weight-semibold);
}
/* inline */
.ActionListItem-descriptionWrap--inline {
position: relative;
flex-direction: row;
align-items: baseline;
gap: var(--base-size-8);
}
/* description */
.ActionListItem-description {
font-size: var(--text-body-size-small);
font-weight: var(--base-text-weight-normal);
line-height: var(--text-body-lineHeight-small);
color: var(--fgColor-muted);
}
/* helper for grid alignment with multi-line content
span wrapping svg or text */
.ActionListItem-visual,
.ActionListItem-action {
display: flex;
min-height: var(--control-medium-lineBoxHeight);
color: var(--fgColor-muted);
pointer-events: none;
fill: var(--fgColor-muted);
align-items: center;
}
/* text */
.ActionListItem-label {
position: relative;
font-size: var(--text-body-size-medium);
font-weight: var(--base-text-weight-normal);
line-height: var(--text-body-lineHeight-medium);
color: var(--fgColor-default);
grid-area: label;
}
.ActionListItem-label--truncate {
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
}
/* nested lists (only supports 1 level currently)
target ActionListItem--subItem for padding-left to maintain :active :after state */
.ActionListItem--subItem > .ActionListContent > .ActionListItem-label {
font-size: var(--text-body-size-small);
line-height: var(--text-body-lineHeight-small);
}
/* trailing action icon button */
.ActionListItem--withActions {
display: flex;
flex-wrap: nowrap;
align-items: center;
}
.ActionListItem-trailingAction {
border-top-left-radius: 0;
border-bottom-left-radius: 0;
}
/* show trailing action button on hover */
.ActionListItem--trailingActionHover .ActionListItem-trailingAction {
visibility: hidden;
}
:is(.ActionListItem--trailingActionHover:hover,.ActionListItem--trailingActionHover:focus-within) .ActionListItem-trailingAction {
visibility: visible;
}
/* ActionList::Divider */
/* with children */
.ActionList-sectionDivider:not(:empty) {
display: flex;
font-size: var(--text-body-size-small);
font-weight: var(--base-text-weight-semibold);
line-height: var(--text-body-lineHeight-small);
color: var(--fgColor-muted);
flex-direction: column;
/* stylelint-disable-next-line primer/spacing */
padding-inline: var(--actionListContent-paddingBlock);
padding-block: var(--base-size-8);
}
/* no children */
.ActionList-sectionDivider:empty {
display: block;
height: var(--borderWidth-thin);
padding: 0;
/* stylelint-disable-next-line primer/spacing */
margin-block-start: calc(var(--base-size-8) - var(--borderWidth-thin));
margin-block-end: var(--base-size-8);
margin-inline: calc(-1 * var(--base-size-8));
list-style: none;
/* stylelint-disable-next-line primer/colors */
background: var(--borderColor-muted);
border: 0;
}
.ActionList-sectionDivider .ActionList-sectionDivider-title {
font-size: var(--text-body-size-small);
font-weight: var(--base-text-weight-semibold);
color: var(--fgColor-muted);
align-self: flex-start;
}
.ActionList-sectionDivider--filled {
/* stylelint-disable-next-line primer/spacing */
margin-block-start: calc(var(--base-size-8) - var(--borderWidth-thin));
margin-block-end: var(--base-size-8);
margin-inline: calc(-1 * var(--base-size-8));
background: var(--bgColor-muted);
border-top: solid var(--borderWidth-thin) var(--borderColor-muted, var(--color-action-list-item-inline-divider));
border-bottom: solid var(--borderWidth-thin) var(--borderColor-muted, var(--color-action-list-item-inline-divider));
/* if no children, treat as divider */
}
.ActionList-sectionDivider--filled:empty {
height: var(--base-size-8);
box-sizing: border-box;
}
.ActionList-sectionDivider--filled:first-child {
margin-block-start: 0;
}

app/components/primer/alpha/action_list.ts

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import {controller} from '@github/catalyst'
// eslint-disable-next-line custom-elements/no-exports-with-element
export class ActionListTruncationObserver {
resizeObserver = new ResizeObserver(entries => {
for (const entry of entries) {
const action = entry.target
if (action instanceof HTMLElement) {
this.update(action)
}
}
})
constructor(el: HTMLElement) {
this.resizeObserver.observe(el)
}
unobserve(el: HTMLElement) {
this.resizeObserver.unobserve(el)
}
update(el: HTMLElement) {
const items = el.querySelectorAll('li')
for (const item of items) {
const label = item.querySelector('.ActionListItem-label') as HTMLElement
if (!label) continue
const tooltip = item.querySelector('.ActionListItem-truncationTooltip') as HTMLElement
if (!tooltip) continue
const isTruncated = label.scrollWidth > label.clientWidth
if (isTruncated) {
tooltip.style.display = ''
} else {
tooltip.style.display = 'none'
}
}
}
}
@controller
// eslint-disable-next-line custom-elements/expose-class-on-global
export class ActionListElement extends HTMLElement {
#truncationObserver: ActionListTruncationObserver
connectedCallback() {
this.#truncationObserver = new ActionListTruncationObserver(this)
}
disconnectedCallback() {
this.#truncationObserver.unobserve(this)
}
}
declare global {
interface Window {
ActionListElement: typeof ActionListElement
}
}