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fix: debounce list update announcements to prevent race conditions during rapid filtering #7745

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fix: debounce list update announcements to prevent race conditions during rapid filtering #7745

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737cd3b
fix: debounce list update announcements to prevent race conditions du…
mustafajw07 Apr 10, 2026
b6d17cb
fix: debounce list update announcements in useAnnouncements to preven…
mustafajw07 Apr 10, 2026
81610c9
Merge branch 'main' into feature/7607-A11y
mustafajw07 Apr 10, 2026
ae34e23
Merge branch 'main' into feature/7611-A11y
francinelucca Apr 10, 2026
5fa2176
refactor: update announcement delay to 300ms in useAnnouncements hook
mustafajw07 Apr 11, 2026
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5 changes: 5 additions & 0 deletions .changeset/use-announcements.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
'@primer/react': patch
---

Debounce list update announcements in `useAnnouncements` to prevent race conditions during rapid filtering. This ensures screen readers don't overwhelm users with intermediate states during fast typing.
61 changes: 33 additions & 28 deletions packages/react/src/FilteredActionList/useAnnouncements.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,7 @@ import type {ItemInput} from '../SelectPanel'

// we add a delay so that it does not interrupt default screen reader announcement and queues after it
const delayMs = 500
const debounceMs = 300

const useFirstRender = () => {
const firstRender = useRef(true)
Expand Down Expand Up @@ -105,40 +106,44 @@ export const useAnnouncements = (
function announceListUpdates() {
if (isFirstRender) return // ignore on first render as announceInitialFocus will also announce

liveRegion?.clear() // clear previous announcements
const timeoutId = window.setTimeout(() => {
liveRegion?.clear() // clear previous announcements

if (items.length === 0 && !loading) {
announce(`${message?.title}. ${message?.description}`, {delayMs})
return
}
if (items.length === 0 && !loading) {
announce(`${message?.title}. ${message?.description}`, {delayMs})
return
}
Comment on lines +109 to +115
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Copilot AI Apr 10, 2026

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delayMs is already passed to announce(...) to intentionally delay announcements (see file-level comment). Using the same delayMs as the setTimeout debounce means list updates are delayed twice (timeout + announce delay), likely ~1000ms instead of the previous 500ms. Consider separating debounce timing from the announcement delay (e.g., debounceMs for the outer timeout, and keep delayMs only for announce, or vice-versa).

This issue also appears in the following locations of the same file:

  • line 108
  • line 111
  • line 124

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@francinelucca francinelucca Apr 11, 2026

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I think this makes sense, perhaps we should remove the delay for this function in lieu of the added debounce

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@mustafajw07 mustafajw07 Apr 11, 2026

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Updated the changes in pr, please validate


if (usingRovingTabindex) {
const announcementText = `${items.length} item${items.length > 1 ? 's' : ''} available, ${selectedItems} selected.`

announce(announcementText, {
delayMs,
from: liveRegion ? liveRegion : undefined,
})
} else {
// give @primer/behaviors a moment to update active-descendant
window.requestAnimationFrame(() => {
const activeItem = getItemWithActiveDescendant(listContainerRef, items)
if (!activeItem) return
const {index, text, selected} = activeItem

const announcementText = [
`List updated`,
`Focused item: ${text}`,
`${selected ? 'selected' : 'not selected'}`,
`${index + 1} of ${items.length}`,
].join(', ')
if (usingRovingTabindex) {
const announcementText = `${items.length} item${items.length > 1 ? 's' : ''} available, ${selectedItems} selected.`

announce(announcementText, {
delayMs,
from: liveRegion ? liveRegion : undefined, // announce will create a liveRegion if it doesn't find one
from: liveRegion ? liveRegion : undefined,
})
})
}
} else {
// give @primer/behaviors a moment to update active-descendant
window.requestAnimationFrame(() => {
const activeItem = getItemWithActiveDescendant(listContainerRef, items)
if (!activeItem) return
const {index, text, selected} = activeItem

const announcementText = [
`List updated`,
`Focused item: ${text}`,
`${selected ? 'selected' : 'not selected'}`,
`${index + 1} of ${items.length}`,
].join(', ')

announce(announcementText, {
delayMs,
from: liveRegion ? liveRegion : undefined, // announce will create a liveRegion if it doesn't find one
})
})
}
}, debounceMs)

return () => window.clearTimeout(timeoutId)
},
[
announce,
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