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Included review availability: This review used your included allowance. Your plan provides up to 8 included reviews per hour; 7 remain after this review. 📝 WalkthroughWalkthroughThe virtualizer subtracts ChangesLast-item scroll alignment
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Change: Bug fix · Severity of issue fixed: Medium Suggested reviewers: Merge Risk: ⚪ Minimal · up to The change fixes end-aligned scrolling to the last item when paddingEnd is set. No actionable merge-blocking risk remains after normal checks. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@packages/virtual-core/tests/index.test.ts`:
- Line 4008: Update the mock scrollHeight in the scrollToIndex lane-max test to
400 so getMaxScrollOffset() yields the documented 200px maximum offset while
preserving the existing clientHeight and assertions.
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piecyk
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piecyk
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Thanks, this is the right shape: keeping the DOM max from #1105 and only subtracting paddingEnd.
Two things before merge:
- The "#1263: shorter lane" test fails on this branch. Its mock has
scrollHeight: 200withclientHeight: 200, sogetMaxScrollOffset()is 0, while the comment and the assertion assume a 400px lane-max. SetscrollHeight: 400and it passes. Please run the full suite locally before pushing. - Run prettier on the test file and rebase onto main.
I'll close #1263 in favour of this one.
…Index(last) end-align Fixes TanStack#1257: when paddingEnd > 0, scrollToIndex(last, { align: 'end' }) was returning the raw DOM max scroll (scrollHeight - clientHeight), which equals (content + paddingEnd - clientHeight) and overshoots the rendered end of the last item by exactly paddingEnd pixels. The fix subtracts paddingEnd from getMaxScrollOffset(), which equals (content - clientHeight) — the correct virtual max offset that keeps the last item flush with the bottom of the viewport. Also preserves TanStack#1001: getMaxScrollOffset() still absorbs DOM extras (borders, padding, unmeasured items) that aren't in our measurements, so multi-lane layouts where the last item lives in a shorter lane still scroll to the lane-max rather than leaving the item above the viewport. Closes TanStack#1263
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dikshit-n
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dikshit-n
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Thanks for the thorough review!
I have addressed your feedback:
- Test fix: Updated scrollHeight to 400 in the shorter lane test so getMaxScrollOffset() returns the documented 200px maximum offset while preserving existing clientHeight and assertions.
- Formatting: Ran prettier on the test file.
- Rebase: Rebased onto latest main.
Will push the fix shortly and re-request your review.
…xScrollOffset() yields 200px
🦋 Changeset detectedLatest commit: 49b397d The changes in this PR will be included in the next version bump. This PR includes changesets to release 9 packages
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@piecyk I have pushed the fix. Updated |
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Summary
Fixes
scrollToIndex(last, { align: 'end' })so it scrolls to the virtual max offset (content end) rather than the raw DOM max scroll offset (content + paddingEnd) whenpaddingEnd > 0.Problem
When
paddingEndis set on a virtualizer,getOffsetForIndex(last, 'end')returnedgetMaxScrollOffset()=scrollHeight - clientHeight. SincescrollHeightincludespaddingEnd, the returned offset overshot the rendered end of the last item by exactlypaddingEndpixels. This madescrollToIndex(count - 1, { align: 'end' })scroll past the last item.Solution
Subtract
paddingEndfromgetMaxScrollOffset():This gives
(content - clientHeight)— the correct virtual max offset that keeps the last item flush with the bottom of the viewport.Why getMaxScrollOffset() and not getTotalSize()?
Using
getMaxScrollOffset()directly (rather thangetTotalSize() - paddingEnd - getSize()) preserves the lane-max behavior added in #1105 (#1001). In multi-lane layouts where the last item lives in a shorter lane,getMaxScrollOffset()still absorbs DOM extras (borders, padding, unmeasured dynamic items) that aren't in our measurements. Targetingitem.endwould regress #1001 by scrolling the last item above the viewport top.Changes
paddingEndfromgetMaxScrollOffset()for last-item end alignmentuseVirtualizer({paddingEnd: 800})creates overscroll issue withscrollToIndex(last)#1257 (paddingEnd overshoot) and fix(virtual-core): scrollToIndex(last) overshoots when paddingEnd > 0 #1263 (lane-max preservation)@tanstack/virtual-coreTesting
All new tests pass. Existing tests (including the #1258 clamped-growth suite) are unaffected.
Closes #1263
Closes #1257
Summary by CodeRabbit