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ollama - ✅(Solved) Fix app/ui: chat doesn't scroll to the bottom on page refresh or when switching conversations [1 pull requests, 1 participants]

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ollama/ollama#15997•Fetched 2026-05-07 03:31:57
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matteocelanimatteocelani
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Root Cause

  1. On page refresh, the tracking ref is initialized with the current chat ID, so the "did the chat change?" check immediately fails — it thinks you're already on this chat.
  2. The ref gets updated unconditionally on every render, even before messages have actually loaded. So when messages finally arrive and the effect re-runs, it thinks nothing changed because the ref was already set.

Fix Action

Fixed

PR fix notes

PR #16001: app/ui: fix scroll-to-bottom not triggering on page refresh or chat switch

Description (problem / solution / changelog)

The useLayoutEffect that scrolls to the bottom on chat switch has two bugs:

  1. prevChatIdRef is initialized with the current chatId, so on page refresh the 'did chatId change?' check immediately fails and the scroll never fires.

  2. The ref is updated unconditionally on every effect run, even when messages haven't loaded yet (length === 0). When messages arrive and the effect re-runs, the check fails because the ref was already set.

Fix: initialize prevChatIdRef as null and move the ref update inside the scroll branch so it only fires after a successful scroll-to-bottom.

Fixes #15997

Changed files

  • app/ui/app/src/components/Chat.tsx (modified, +2/-2)
RAW_BUFFERClick to expand / collapse

What is the issue?

When you open a long chat via a direct link or refresh the page, the chat stays scrolled to the top instead of jumping to the most recent messages at the bottom. The same can happen intermittently when switching between chats — sometimes the scroll-to-bottom just doesn't fire.

Why it happens The scroll-to-bottom logic tracks the previous chat ID to detect navigation. Two problems:

  1. On page refresh, the tracking ref is initialized with the current chat ID, so the "did the chat change?" check immediately fails — it thinks you're already on this chat.
  2. The ref gets updated unconditionally on every render, even before messages have actually loaded. So when messages finally arrive and the effect re-runs, it thinks nothing changed because the ref was already set.

Expected behavior Opening any existing chat — whether via navigation or page refresh — should always scroll to the most recent messages at the bottom.

Relevant log output

OS

macOS

GPU

Intel, Apple

CPU

Apple

Ollama version

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