primer · TylerJDev · Nov 10, 2025
@@ -361,6 +361,19 @@
     }
   }
 
+  &:has(.TrailingAction[data-show-on-hover='true']),
+  &[data-is-active-descendant] {
+    .TrailingAction {
+      display: none;
+    }
+
+    &:hover .TrailingAction,
+    &:focus-within .TrailingAction,
+    &[data-is-active-descendant] .TrailingAction {
+      display: inherit;
+    }
+  }
+
   /* Make sure that the first visible item isn't a divider */
   &[aria-hidden] + .Divider {
     display: none;
@@ -760,6 +773,8 @@ span wrapping svg or text */
   grid-row: 2/2;
 }
 
+
+
 @keyframes checkmarkIn {
   from {
     clip-path: inset(var(--base-size-16) 0 0 0);

@@ -16,6 +16,8 @@ import VisuallyHidden from '../_VisuallyHidden'
 import classes from './ActionList.module.css'
 import {clsx} from 'clsx'
 import {fixedForwardRef} from '../utils/modern-polymorphic'
+import {useIsMacOS} from '../hooks'
+import {getAccessibleKeybindingHintString} from '../KeybindingHint'
 
 type ActionListSubItemProps = {
   children?: React.ReactNode
@@ -88,13 +90,14 @@ const UnwrappedItem = <As extends React.ElementType = 'li'>(
     <TrailingVisual>{defaultTrailingVisual}</TrailingVisual>
   ) : null
   const trailingVisual = slots.trailingVisual ?? wrappedDefaultTrailingVisual
+  const isMacOS = useIsMacOS()
 
   const {role: listRole, selectionVariant: listSelectionVariant} = React.useContext(ListContext)
   const {selectionVariant: groupSelectionVariant} = React.useContext(GroupContext)
   const inactive = Boolean(inactiveText)
   // TODO change `menuContext` check to ```listRole !== undefined && ['menu', 'listbox'].includes(listRole)```
   // once we have a better way to handle existing usage in dotcom that incorrectly use ActionList.TrailingAction
-  const menuContext = container === 'ActionMenu' || container === 'SelectPanel' || container === 'FilteredActionList'
+  const menuContext = container === 'ActionMenu'
   // TODO: when we change `menuContext` to check `listRole` instead of `container`
   const showInactiveIndicator = inactive && !(listRole !== undefined && ['menu', 'listbox'].includes(listRole))
 
@@ -165,6 +168,16 @@ const UnwrappedItem = <As extends React.ElementType = 'li'>(
   const keyPressHandler = React.useCallback(
     (event: React.KeyboardEvent<HTMLElement>) => {
       if (disabled || inactive || loading) return
+
+      // TODO: Move this logic to `filteredActionList`
+      if (event.key === 'U' || event.key === 'u') {
+        if (event.shiftKey && (isMacOS ? event.metaKey : event.ctrlKey)) {
+          event.preventDefault()
+          alert('Activated Trailing Action')
+          // do some action ...
+        }
+      }
+
       if ([' ', 'Enter'].includes(event.key)) {
         if (event.key === ' ') {
           event.preventDefault() // prevent scrolling on Space
@@ -175,7 +188,7 @@ const UnwrappedItem = <As extends React.ElementType = 'li'>(
         onSelect(event, afterSelect)
       }
     },
-    [onSelect, disabled, loading, inactive, afterSelect],
+    [onSelect, disabled, loading, inactive, afterSelect, isMacOS],
   )
 
   const itemId = useId(id)
@@ -202,9 +215,12 @@ const UnwrappedItem = <As extends React.ElementType = 'li'>(
   // Extract the variant prop value from the description slot component
   const descriptionVariant = slots.description?.props.variant ?? 'inline'
 
+  const shortcut = `Shift+${isMacOS ? 'Meta' : 'Control'}+U`
+  const trailingActionShortcutText = `(press ${getAccessibleKeybindingHintString(shortcut, isMacOS)} for more actions)`
+
   const menuItemProps = {
     onClick: clickHandler,
-    onKeyPress: !buttonSemantics ? keyPressHandler : undefined,
+    onKeyDown: !buttonSemantics ? keyPressHandler : undefined,
     'aria-disabled': disabled ? true : undefined,
     'data-inactive': inactive ? true : undefined,
     'data-loading': loading && !inactive ? true : undefined,
@@ -258,6 +274,7 @@ const UnwrappedItem = <As extends React.ElementType = 'li'>(
         data-inactive={inactiveText ? true : undefined}
         data-has-subitem={slots.subItem ? true : undefined}
         data-has-description={slots.description ? true : false}
+        data-has-trailing-action={slots.trailingAction ? true : undefined}
         className={clsx(classes.ActionListItem, className)}
       >
         <ItemWrapper
@@ -289,6 +306,7 @@ const UnwrappedItem = <As extends React.ElementType = 'li'>(
                 {/* Loading message needs to be in here so it is read with the label */}
                 {/* If the item is inactive, we do not simultaneously announce that it is loading */}
                 {loading === true && !inactive && <VisuallyHidden>Loading</VisuallyHidden>}
+                {slots.trailingAction && <VisuallyHidden>{trailingActionShortcutText}</VisuallyHidden>}
               </span>
               {slots.description}
             </ConditionalWrapper>

@@ -53,6 +53,9 @@ const UnwrappedList = <As extends React.ElementType = 'ul'>(
     bindKeys: FocusKeys.ArrowVertical | FocusKeys.HomeAndEnd | FocusKeys.PageUpDown,
     focusOutBehavior:
       listRole === 'menu' || container === 'SelectPanel' || container === 'FilteredActionList' ? 'wrap' : undefined,
+    focusableElementFilter: element => {
+      return !(element.parentElement?.getAttribute('data-component') === 'TrailingAction')
+    },
   })
 
   return (

@@ -26,12 +26,21 @@ export type ActionListTrailingActionProps = ElementProps & {
   label: string
   className?: string
   style?: React.CSSProperties
+  showOnHover?: boolean
 }
 
 export const TrailingAction = forwardRef(
-  ({as = 'button', icon, label, href = null, className, style, loading, ...props}, forwardedRef) => {
+  (
+    {as = 'button', icon, label, href = null, className, style, loading, showOnHover = true, ...props},
+    forwardedRef,
+  ) => {
     return (
-      <span className={clsx(className, classes.TrailingAction)} style={style}>
+      <span
+        className={clsx(className, classes.TrailingAction)}
+        style={style}
+        data-show-on-hover={showOnHover}
+        data-component="TrailingAction"
+      >
         {icon ? (
           <IconButton
             as={as}

@@ -2,7 +2,7 @@
 import {scrollIntoView, FocusKeys} from '@primer/behaviors'
 import type {KeyboardEventHandler, JSX} from 'react'
 import type React from 'react'
-import {useCallback, useEffect, useRef, useState} from 'react'
+import {act, useCallback, useEffect, useRef, useState} from 'react'
 import type {TextInputProps} from '../TextInput'
 import TextInput from '../TextInput'
 import {ActionList} from '../ActionList'
@@ -23,6 +23,7 @@
 import {useAnnouncements} from './useAnnouncements'
 import {clsx} from 'clsx'
 import {useFeatureFlag} from '../FeatureFlags'
+import {useIsMacOS} from '../hooks'
 
 const menuScrollMargins: ScrollIntoViewOptions = {startMargin: 0, endMargin: 8}
 
@@ -93,6 +94,8 @@
   const inputDescriptionTextId = useId()
   const [isInputFocused, setIsInputFocused] = useState(false)
 
+  const isMacOS = useIsMacOS()
+
   const selectAllChecked = items.length > 0 && items.every(item => item.selected)
   const selectAllIndeterminate = !selectAllChecked && items.some(item => item.selected)
 
@@ -152,6 +155,16 @@
 
   const onInputKeyPress: KeyboardEventHandler = useCallback(
     (event: React.KeyboardEvent<HTMLInputElement>) => {
+      if (event.key === 'U' || event.key === 'u') {
+        if (event.shiftKey && (isMacOS ? event.metaKey : event.ctrlKey)) {
+          if (!activeDescendantRef.current?.hasAttribute('data-has-trailing-action')) return
+
+          event.preventDefault()
+          alert('Activated Trailing Action')
+          // do some action ...
+        }
+      }
+
       if (event.key === 'Enter' && activeDescendantRef.current) {
         event.preventDefault()
         event.nativeEvent.stopImmediatePropagation()
@@ -161,7 +174,7 @@
         activeDescendantRef.current.dispatchEvent(activeDescendantEvent)
       }
     },
-    [activeDescendantRef],
+    [activeDescendantRef, isMacOS],
   )
 
   // BEGIN: Todo remove when we remove usingRemoveActiveDescendant
@@ -184,7 +197,10 @@
           bindKeys: FocusKeys.ArrowVertical | FocusKeys.PageUpDown,
           focusOutBehavior: 'wrap',
           focusableElementFilter: element => {
-            return !(element instanceof HTMLInputElement)
+            return (
+              !(element instanceof HTMLInputElement) &&
+              !(element.parentElement?.getAttribute('data-component') === 'TrailingAction')
+            )
           },
           activeDescendantFocus: inputRef,
           onActiveDescendantChanged: (current, previous, directlyActivated) => {
@@ -347,8 +363,8 @@
           color="fg.default"
           value={filterValue}
           onChange={onInputChange}
-          onKeyPress={onInputKeyPress}
-          onKeyDown={usingRemoveActiveDescendant ? onInputKeyDown : () => {}}
+          // onKeyPress={onInputKeyPress}
+          onKeyDown={usingRemoveActiveDescendant ? onInputKeyDown : onInputKeyPress}
           placeholder={placeholderText}
           role="combobox"
           aria-expanded="true"
@@ -398,6 +414,7 @@
     leadingVisual: LeadingVisual,
     trailingText,
     trailingIcon: TrailingIcon,
+    trailingAction,
     onAction,
     children,
     ...rest
@@ -436,6 +453,16 @@
           {TrailingIcon && <TrailingIcon />}
         </ActionList.TrailingVisual>
       ) : null}
+      {trailingAction ? (
+        <ActionList.TrailingAction
+          label={trailingAction.label}
+          icon={trailingAction.icon}
+          {...(trailingAction.as === 'a' && trailingAction.href
+            ? {as: 'a' as const, href: trailingAction.href}
+            : {as: 'button' as const, loading: trailingAction.loading})}
+          onClick={trailingAction.onClick}
+        />
+      ) : null}
     </ActionList.Item>
   )
 }

@@ -51,6 +51,37 @@ export interface FilteredActionListItemProps {
    */
   trailingVisual?: React.ElementType | React.ReactNode
 
+  /**
+   * An action positioned after the `Item` text. This is a button or link that appears at the end of the item.
+   * Only available for items in SelectPanel (not available in ActionMenu or other contexts with menu/listbox roles).
+   */
+  trailingAction?: {
+    /**
+     * The label for the action button. Used as aria-label if icon is provided, or as button text if no icon.
+     */
+    label: string
+    /**
+     * Optional icon to display in the action button.
+     */
+    icon?: React.ElementType
+    /**
+     * The element type to render. Defaults to 'button'.
+     */
+    as?: 'button' | 'a'
+    /**
+     * The href for the action when rendered as a link (as='a').
+     */
+    href?: string
+    /**
+     * Whether the action is in a loading state. Only available for button elements.
+     */
+    loading?: boolean
+    /**
+     * onClick handler for the action.
+     */
+    onClick?: (event: React.MouseEvent<HTMLElement>) => void
+  }
+
   /**
    * Style variations associated with various `Item` types.
    *

@@ -4,7 +4,7 @@ import {Button} from '../Button'
 import type {ItemInput} from '../FilteredActionList'
 import {SelectPanel} from './SelectPanel'
 import type {OverlayProps} from '../Overlay'
-import {TriangleDownIcon} from '@primer/octicons-react'
+import {TriangleDownIcon, PencilIcon, TrashIcon} from '@primer/octicons-react'
 import {ActionList} from '../ActionList'
 import FormControl from '../FormControl'
 import {Stack} from '../Stack'
@@ -583,3 +583,83 @@ export const RenderMoreOnScroll = () => {
     </form>
   )
 }
+
+export const WithTrailingActions = () => {
+  const itemsWithTrailingActions = [
+    {
+      leadingVisual: getColorCircle('#a2eeef'),
+      text: 'enhancement',
+      id: 1,
+      trailingAction: {
+        label: 'Edit enhancement',
+        icon: PencilIcon,
+        onClick: (e: React.MouseEvent<HTMLElement>) => {
+          e.stopPropagation()
+          alert('Edit enhancement clicked!')
+        },
+      },
+    },
+    {
+      leadingVisual: getColorCircle('#d73a4a'),
+      text: 'bug',
+      id: 2,
+    },
+    {
+      leadingVisual: getColorCircle('#0cf478'),
+      text: 'good first issue',
+      id: 3,
+      trailingAction: {
+        label: 'Remove label',
+        icon: TrashIcon,
+        onClick: (e: React.MouseEvent<HTMLElement>) => {
+          e.stopPropagation()
+          alert('Remove label clicked!')
+        },
+      },
+    },
+    {
+      leadingVisual: getColorCircle('#ffd78e'),
+      text: 'design',
+      id: 4,
+      trailingAction: {
+        label: 'More info',
+        as: 'button' as const,
+        onClick: (e: React.MouseEvent<HTMLElement>) => {
+          e.stopPropagation()
+          alert('More info clicked!')
+        },
+      },
+    },
+  ]
+
+  const [selected, setSelected] = useState<ItemInput[]>([itemsWithTrailingActions[0]])
+  const [filter, setFilter] = useState('')
+  const filteredItems = itemsWithTrailingActions.filter(item =>
+    item.text.toLowerCase().startsWith(filter.toLowerCase()),
+  )
+
+  const [open, setOpen] = useState(false)
+
+  return (
+    <FormControl>
+      <FormControl.Label>Labels with trailing actions</FormControl.Label>
+      <SelectPanel
+        title="Select labels"
+        placeholder="Select labels"
+        renderAnchor={({children, ...anchorProps}) => (
+          <Button trailingAction={TriangleDownIcon} {...anchorProps}>
+            {children}
+          </Button>
+        )}
+        open={open}
+        onOpenChange={setOpen}
+        items={filteredItems}
+        selected={selected}
+        onSelectedChange={setSelected}
+        onFilterChange={setFilter}
+        overlayProps={{width: 'medium'}}
+        message={filteredItems.length === 0 ? NoResultsMessage(filter) : undefined}
+      />
+    </FormControl>
+  )
+}