[Carousel] Hide prev/next navigation arrows when there is nothing left to scroll by Maanvi212006 · Pull Request #1848 · layer5io/sistent

Maanvi212006 · 2026-09-22T04:47:37Z

What this fixes

The Carousel component (used by PerformersSection / "Top Performers") always shows both the left and right navigation arrows, even when the row is fully scrolled to the start or end, or when all items already fit on screen with nothing to scroll. This was flagged as part of catalog UX feedback: the arrows give a false signal that there's more content in a direction where there isn't.

Change

Added canScrollLeft / canScrollRight state, computed from the scroll container's scrollLeft, clientWidth, and scrollWidth.
Arrow visibility is now recalculated on mount, on onScroll, on window resize, and when the item count changes (metrics load asynchronously).
Each arrow is hidden (visibility: hidden) instead of unmounted, so the carousel's layout doesn't shift when an arrow disappears.
Added a small scroll tolerance (1px) to account for fractional scroll positions from scroll-snap-type: x mandatory.
Added missing aria-labels to both buttons.

Only src/custom/Carousel/Carousel.tsx was changed.

screen-capture.8.mp4

This PR fixes #

Signed commits

Yes, I signed my commits.

Summary by CodeRabbit

Bug Fixes
- Carousel navigation buttons are hidden when scrolling further in their direction isn’t available.
- Navigation availability updates after scrolling, resizing, or changes to carousel items, including changes that affect item widths.
- Scroll availability is handled accurately at fractional scroll positions, avoiding incorrect button visibility near the ends of a carousel.
Accessibility
- Carousel navigation buttons now have accessible labels.

Signed-off-by: Maanvi Chetwani <maanvichetwani21@gmail.com>

coderabbitai · 2026-09-22T04:47:49Z

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src/custom/Carousel/Carousel.tsx

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📝 Walkthrough

Walkthrough

The carousel tracks directional scroll availability. It updates this state on scroll, container or child resize, and changes to the item count. Navigation buttons hide when scrolling in their direction is unavailable and have accessible labels.

Changes

Carousel scroll controls

Layer / File(s)	Summary
Scroll tracking and navigation controls `src/custom/Carousel/Carousel.tsx`	The component recalculates directional scroll availability with a one-pixel tolerance. A `ResizeObserver` tracks container and child size changes. Navigation buttons have accessible labels and hide when scrolling in their direction is unavailable.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~10 minutes

Change: Bug fix

Suggested reviewers: katotodan

Merge Risk: ⚪ Minimal · up to 409b0

Directional navigation is updated from the carousel’s scroll metrics without a verified merge-blocking regression.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: hiding Carousel navigation arrows when no scrolling is available in that direction.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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Inline comments:
In `@src/custom/Carousel/Carousel.tsx`:
- Line 37: Update the dependency array for the effect invoking updateScrollState
to depend on items rather than items.length, so content changes with unchanged
item count trigger recalculation. If rendered children can resize after the
effect runs, observe the items or their size-tracking wrapper with
ResizeObserver and invoke updateScrollState on size changes.

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… length Signed-off-by: Maanvi Chetwani <maanvichetwani21@gmail.com>

Katotodan · 2026-09-22T14:00:27Z

@Maanvi212006 can you provide screen recording of before and after?

Katotodan

Look good overall.
Just few points to discuss.

Signed-off-by: Maanvi Chetwani <maanvichetwani21@gmail.com>

leecalcote

Thanks @Maanvi212006, hiding arrows when there is nothing to scroll removes a misleading affordance, and using visibility keeps the layout stable. The tolerance for fractional scrollLeft and the added aria-labels are thoughtful touches. Checks are green and DCO is signed.

Notes:

ResizeObserver is not available in some test environments (jsdom) or older embedded browsers, which would throw on mount. A small guard keeps the component safe (inline suggestion).
When an arrow is hidden with visibility: hidden, it is also removed from the accessibility tree, which is what we want, so that is good.
#1841 also edits the imports in this file, so one of the two will need a quick rebase.

leecalcote · 2026-10-13T16:05:17Z

+
+    updateScrollState();
+
+    const observer = new ResizeObserver(updateScrollState);


A guard keeps this from throwing where ResizeObserver is not defined (for example jsdom without a polyfill):

Suggested change

const observer = new ResizeObserver(updateScrollState);

if (typeof ResizeObserver === 'undefined') return;

const observer = new ResizeObserver(updateScrollState);

[Carousel] Hide prev/next arrows when there is nothing left to scroll

f6cfea3

Signed-off-by: Maanvi Chetwani <maanvichetwani21@gmail.com>

coderabbitai Bot reviewed Sep 22, 2026

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Comment thread src/custom/Carousel/Carousel.tsx

fix: recalc carousel scroll state on items reference change, not just…

b63f82e

… length Signed-off-by: Maanvi Chetwani <maanvichetwani21@gmail.com>

Katotodan reviewed Oct 2, 2026

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Comment thread src/custom/Carousel/Carousel.tsx Outdated

Comment thread src/custom/Carousel/Carousel.tsx Outdated

Maanvi212006 added 2 commits October 3, 2026 12:41

Merge branch 'master' into fix/carousel-hide-arrows-at-ends

1a3746e

Use ResizeObserver and clamp max scroll

409b0bb

Signed-off-by: Maanvi Chetwani <maanvichetwani21@gmail.com>

Maanvi212006 requested a review from Katotodan October 3, 2026 13:28

Merge branch 'master' into fix/carousel-hide-arrows-at-ends

0c50767

leecalcote reviewed Oct 13, 2026

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leecalcote merged commit 168c663 into layer5io:master Oct 13, 2026
6 checks passed

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[Carousel] Hide prev/next navigation arrows when there is nothing left to scroll - #1848

[Carousel] Hide prev/next navigation arrows when there is nothing left to scroll#1848
leecalcote merged 5 commits into
layer5io:masterfrom
Maanvi212006:fix/carousel-hide-arrows-at-ends

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		updateScrollState();

		const observer = new ResizeObserver(updateScrollState);

	const observer = new ResizeObserver(updateScrollState);
	if (typeof ResizeObserver === 'undefined') return;
	const observer = new ResizeObserver(updateScrollState);

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Maanvi212006 commented Sep 22, 2026 •

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