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anchorTo: 'end' loses the end when the scroll element shrinks

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Seit 07.10.2026.

  • #1298 von @langleyd — offen

Bewertung

Schwierigkeit
3/5
Geschätzter Aufwand
1-2 Tage
Anfängerfreundlichkeit
68/100
Issue-Typ
Bug
Klarheit
Klar beschrieben
Aktivitätsstatus
Aktiv
Tech-Stack
typescript
Bereich
frontend

Rechercherichtung

Start in packages/virtual-core where anchorTo: 'end' scroll adjustments and the resize handling live, and compare how an item growing is compensated versus how scroll-element size changes are handled. Reproduce using the chat e2e page in packages/react-virtual/e2e/app/chat/main.tsx on branch langleyd/virtual:fix/end-anchor-scroll-element-resize, which has a control that shrinks the container. Done means an end-pinned viewport stays pinned after the container shrinks, verified by the existing e2e suite plus a new case for container resize.

Vom Indexierungsmodell aus dem Issue-Text verfasst.

Beschreibung

Describe the bug

With anchorTo: 'end', a viewport pinned to the end stays pinned when the last item grows, but not when the scroll element itself gets shorter, for example when the window is resized or the app changes the element's height. The browser keeps scrollTop, so the newest items end up below the fold by the amount the element shrank.

In a chat application this be an element being displayed on the page(say a banner above or below the scroll element) that causes the scroll element to shrink. The effect being the users losing the their place and not seeing the most recent message.

Your minimal, reproducible example

The chat e2e page on langleyd/virtual, branch fix/end-anchor-scroll-element-resize, has a control that shrinks the scroll container: packages/react-virtual/e2e/app/chat/main.tsx.

Steps to reproduce
  1. Render an end-anchored list and scroll to the end.
  2. Reduce the scroll element's height, or resize the window when it is sized from the viewport.
  3. The last items are now below the fold.
Expected behavior

An end-pinned viewport stays pinned to the end, as it does when an item grows.

How often does this bug happen?

Every time

Screenshots or Videos
Currently

https://github.com/user-attachments/assets/d420fad5-7bef-426e-9d10-f72125c80fbf

Expected

https://github.com/user-attachments/assets/58152695-83aa-4da8-9e49-12c422de0499

Platform

any browser. Seen in Chrome on macOS.

tanstack-virtual version

3.17.11

TypeScript version

No response

Additional context

No response

Terms & Code of Conduct
  • I agree to follow this project's Code of Conduct
  • I understand that if my bug cannot be reliable reproduced in a debuggable environment, it will probably not be fixed and this issue may even be closed.
Vorherrschende Sprache
TypeScript
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Ø Merge
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Gemergte PRs (30 T.)
31

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Erste Schritte

  1. Lesen Sie das ganze Issue und danach den Beitragsleitfaden des Projekts.
  2. Schreiben Sie ins Issue, dass Sie es übernehmen — das erspart doppelte Arbeit.
  3. Forken Sie das Repository und arbeiten Sie in einem Branch.
  4. Öffnen Sie einen Pull Request, der die Issue-Nummer nennt.

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