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minstrel/web/src/lib/components/ListContinuation.svelte
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bvandeusenandClaude Opus 5.5 0f9ddbca97
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feat(web): every paged list loads as you scroll; Liked becomes tabs (#5416)
Preference 172: no "Load more" buttons. Eight remained, on Liked (three
sections), the three Search overflow pages, Genres and Years.

- ListContinuation: the one bottom-of-list block. It loads the next page
  ahead of the reader, announces "Loading more…" through aria-live, shows an
  optional end line, and on a failed page shows the error with Try again,
  dropping the sentinel so a dead endpoint isn't re-hit on every scroll.
  Used on all ten paged lists, including the four that already autoloaded.
- A failed next page no longer replaces the list. TanStack sets isError for
  it, so the page-level error branches now apply only to a failed first
  load. Genres and Years did the same with their own loader; a later
  page's failure now keeps the grid.
- Liked: Artists | Albums | Tracks tabs (operator's choice). Stacked, a
  long Artists list loading as you scroll would bury the other two. It
  opens on the first tab that has likes.
- TabStrip: the in-page tab strip, now shared by Liked, Playback errors
  and Requests.
- test-utils/intersectionObserver: a stand-in so tests can scroll to the end.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2026-10-08 16:55:33 -04:00

50 lines
1.8 KiB
Svelte

<script lang="ts">
// The bottom of every paged list (#5416, preference 172): the next page
// loads on its own as the reader nears the end, with no "Load more"
// button. What the button used to give for free is kept here:
//
// - In flight: a "Loading more…" line, announced through aria-live, so the
// list doesn't look finished while it isn't.
// - Finished: an optional quiet end line (`endLabel`).
// - Failed: the error and a Try again button. The sentinel is removed while
// a page has failed, so a dead endpoint isn't re-requested on every scroll.
import InfiniteScrollSentinel from './InfiniteScrollSentinel.svelte';
let {
hasMore,
loading,
failed = false,
onMore,
endLabel
}: {
/** Whether another page exists. */
hasMore: boolean;
/** A next page is in flight. */
loading: boolean;
/** The last next-page fetch failed. */
failed?: boolean;
/** Fetch the next page (TanStack's fetchNextPage, or a page's own loader). */
onMore: () => void;
/** Shown once the list is complete, e.g. "End of history". */
endLabel?: string;
} = $props();
</script>
{#if failed}
<div role="alert" class="flex items-center justify-center gap-2 py-2 text-sm text-error-fg">
Couldn't load more.
<button
type="button"
class="rounded border border-border px-2 py-0.5 text-text-primary hover:bg-surface-hover
focus-visible:outline-solid focus-visible:outline-2 focus-visible:outline-accent"
onclick={onMore}>Try again</button
>
</div>
{:else if hasMore}
<InfiniteScrollSentinel enabled={!loading} onIntersect={onMore} />
{/if}
<p class="py-2 text-center text-sm text-text-secondary empty:hidden" aria-live="polite">
{#if !failed && hasMore && loading}Loading more…{:else if !hasMore && endLabel}{endLabel}{/if}
</p>