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feat(ui): floating back-to-top button on long scrollable pages

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A reusable BackToTop fades in once the active page's <main> is scrolled past ~600px and
smooth-scrolls it back to the top. Rendered once at the App root, portaled to <body> for
viewport-fixed placement (bottom-right, below the chat dock), and re-binds to the live <main> on
navigation (page or channel change) so it works on every scrollable page incl. the channel page.
EN/HU/DE.
This commit is contained in:
npeter83 2026-06-30 05:02:42 +02:00
parent f25d0768a1
commit 6b47b0d357
5 changed files with 53 additions and 3 deletions
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3
frontend/src/App.tsx
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@ -29,6 +29,7 @@ import NavSidebar from "./components/NavSidebar";
import Sidebar from "./components/Sidebar";
import Feed from "./components/Feed";
import ChannelPage from "./components/ChannelPage";
import BackToTop from "./components/BackToTop";
import Channels, { type ChannelStatusFilter, type ChannelsView } from "./components/Channels";
import Playlists from "./components/Playlists";
import Stats from "./components/Stats";
@ -667,6 +668,8 @@ export default function App() {
<ReleaseNotes onClose={() => setNotesOpen(false)} highlight={notesHighlight} />
)}
<ErrorDialog />
{/* Re-binds to the active page's scroll container on navigation (page or channel change). */}
<BackToTop dep={channelView ? `chan:${channelView.id}` : page} />
</div>
);
}

44
frontend/src/components/BackToTop.tsx Normal file
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@ -0,0 +1,44 @@
import { useEffect, useRef, useState } from "react";
import { createPortal } from "react-dom";
import { ArrowUp } from "lucide-react";
import { useTranslation } from "react-i18next";
// A floating "back to top" button that fades in once the current page's scroll container is
// scrolled past a threshold, and smooth-scrolls it back to the top. Every page scrolls inside its
// own <main class="overflow-y-auto"> (the normal pages share App's; the channel page has its own),
// so it targets the live <main> and re-binds whenever `dep` changes (i.e. on navigation). Portaled
// to <body> so its fixed position is viewport-relative regardless of transformed ancestors.
export default function BackToTop({ dep, threshold = 600 }: { dep?: unknown; threshold?: number }) {
const { t } = useTranslation();
const [show, setShow] = useState(false);
const scrollerRef = useRef<HTMLElement | null>(null);
useEffect(() => {
const el = document.querySelector("main");
scrollerRef.current = el;
if (!el) {
setShow(false);
return;
}
const onScroll = () => setShow(el.scrollTop > threshold);
onScroll(); // a freshly-bound page starts at the top → hidden
el.addEventListener("scroll", onScroll, { passive: true });
return () => el.removeEventListener("scroll", onScroll);
}, [dep, threshold]);
const toTop = () => scrollerRef.current?.scrollTo({ top: 0, behavior: "smooth" });
return createPortal(
<button
onClick={toTop}
aria-label={t("common.backToTop")}
title={t("common.backToTop")}
className={`fixed bottom-5 right-5 z-30 inline-flex items-center justify-center w-11 h-11 rounded-full bg-card border border-border text-fg shadow-lg hover:border-accent hover:text-accent transition-all duration-200 ${
show ? "opacity-100 translate-y-0" : "opacity-0 translate-y-3 pointer-events-none"
}`}
>
<ArrowUp className="w-5 h-5" />
</button>,
document.body
);
}

3
frontend/src/i18n/locales/de/common.json
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@ -15,5 +15,6 @@
"accessRequestsMessage": "{{count}} ausstehend — prüfe sie auf der Benutzer-Seite.",
"accessRequestsReview": "Überprüfen",
"demoTitle": "Demo-Konto",
"demoSharedNotice": "Du bist im gemeinsamen Demo-Konto. Alles, was du hier tust — Playlists, ausgeblendete Videos, Einstellungen — ist gemeinsam und kann von anderen Demo-Besuchern gleichzeitig geändert werden."
"demoSharedNotice": "Du bist im gemeinsamen Demo-Konto. Alles, was du hier tust — Playlists, ausgeblendete Videos, Einstellungen — ist gemeinsam und kann von anderen Demo-Besuchern gleichzeitig geändert werden.",
"backToTop": "Nach oben"
}

3
frontend/src/i18n/locales/en/common.json
View file

@ -15,5 +15,6 @@
"accessRequestsMessage": "{{count}} pending — review them on the Users page.",
"accessRequestsReview": "Review",
"demoTitle": "Demo account",
"demoSharedNotice": "You're in the shared demo account. Everything you do here — playlists, hidden videos, settings — is communal and may be changed by other demo visitors at the same time."
"demoSharedNotice": "You're in the shared demo account. Everything you do here — playlists, hidden videos, settings — is communal and may be changed by other demo visitors at the same time.",
"backToTop": "Back to top"
}

3
frontend/src/i18n/locales/hu/common.json
View file

@ -15,5 +15,6 @@
"accessRequestsMessage": "{{count}} függőben — nézd át a Felhasználók oldalon.",
"accessRequestsReview": "Áttekintés",
"demoTitle": "Demo fiók",
"demoSharedNotice": "Egy közös demo fiókban vagy. Minden, amit itt csinálsz — lejátszási listák, elrejtett videók, beállítások — közös, és más demo látogatók egyszerre módosíthatják."
"demoSharedNotice": "Egy közös demo fiókban vagy. Minden, amit itt csinálsz — lejátszási listák, elrejtett videók, beállítások — közös, és más demo látogatók egyszerre módosíthatják.",
"backToTop": "Vissza a tetejére"
}