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// and appends to both the mobile vertical grid and the desktop grid. SSR
// Pagination on desktop stays in the DOM as a fallback for crawlers / no-JS.
import {
parseCards,
prependPages,
recordPage,
restoreFrom,
trackScroll,
} from "./infinite-scroll-history";
export type InfiniteScrollState = {
/** First page whose cards are in the DOM. */
firstPage: number;
currentPage: number;
totalPages: number;
loading: boolean;
done: boolean;
};
export const FETCH_TRIGGER_MARGIN = "600px";
export function readInitialState(root: HTMLElement): InfiniteScrollState {
const currentPage = parseInt(root.dataset.currentPage || "1", 10);
return {
firstPage: currentPage,
currentPage,
totalPages: parseInt(root.dataset.totalPages || "1", 10),
loading: false,
done: false,
};
}
export function buildNextUrl(page: number): string {
const url = new URL(window.location.href);
url.searchParams.set("page", String(page));
return `/api/pros-fragment${url.search}`;
}
export function showLoading(el: HTMLElement | null, visible: boolean) {
if (el) el.hidden = !visible;
}
export function showEndMessage(el: HTMLElement | null) {
if (el) el.hidden = false;
}
export async function fetchNextPage(
state: InfiniteScrollState,
grids: HTMLElement[],
): Promise<boolean> {
const nextPage = state.currentPage + 1;
const res = await fetch(buildNextUrl(nextPage), {
headers: { Accept: "text/html" },
});
if (!res.ok) {
throw new Error(`fragment fetch failed: ${res.status}`);
}
const html = await res.text();
const totalPagesHeader = res.headers.get("X-Total-Pages");
if (totalPagesHeader) {
state.totalPages = parseInt(totalPagesHeader, 10) || state.totalPages;
}
const cards = parseCards(html);
for (const grid of grids) {
for (const card of cards) {
grid.appendChild(card.cloneNode(true));
}
}
state.currentPage = nextPage;
recordPage(state.firstPage, nextPage);
return nextPage >= state.totalPages;
}
export function init() {
const root = document.querySelector<HTMLElement>(
"[data-pros-infinite-scroll-root]",
);
if (!root || root.dataset.infiniteScrollInitialized) return;
root.dataset.infiniteScrollInitialized = "true";
const mobileGrid = root.querySelector<HTMLElement>(
'[data-pros-grid="mobile"]',
);
const desktopGrid = document.querySelector<HTMLElement>(
'[data-pros-grid="desktop"]',
);
const sentinel = document.querySelector<HTMLElement>("[data-pros-sentinel]");
const loadingEl = document.querySelector<HTMLElement>("[data-pros-loading]");
const endEl = document.querySelector<HTMLElement>("[data-pros-end]");
const ssrPagination = document.querySelectorAll<HTMLElement>(
"[data-pros-ssr-pagination]",
);
if (!sentinel) return;
const grids = [mobileGrid, desktopGrid].filter(
(g): g is HTMLElement => g !== null,
);
if (grids.length === 0) return;
for (const el of ssrPagination) {
el.hidden = true;
}
const state = readInitialState(root);
// Back to an entry left on page N: the server rendered page N alone, so put
// the pages before it back, then return to the saved offset.
const restore = restoreFrom(state.currentPage);
let restored: Promise<void> = Promise.resolve();
if (restore) {
state.firstPage = restore.first;
state.loading = true;
showLoading(loadingEl, true);
restored = prependPages(
restore.first,
state.currentPage - 1,
buildNextUrl,
grids,
)
.then(() => window.scrollTo(0, restore.y ?? 0))
.catch((err) =>
console.error("[pros] restoring earlier pages failed", err),
)
.finally(() => {
state.loading = false;
showLoading(loadingEl, false);
});
}
void restored.then(trackScroll);
// Already on the last page: nothing to load. No end message either; it
// would appear at load and push the content below it (layout shift).
if (state.currentPage >= state.totalPages) {
state.done = true;
return;
}
const observer = new IntersectionObserver(
async (entries) => {
if (state.loading || state.done) return;
if (!entries.some((e) => e.isIntersecting)) return;
state.loading = true;
showLoading(loadingEl, true);
try {
const finished = await fetchNextPage(state, grids);
if (finished) {
state.done = true;
observer.disconnect();
showEndMessage(endEl);
} else {
observer.unobserve(sentinel);
observer.observe(sentinel);
}
} catch (err) {
console.error("[pros] infinite scroll fetch failed", err);
for (const el of ssrPagination) {
el.hidden = false;
}
state.done = true;
observer.disconnect();
} finally {
state.loading = false;
showLoading(loadingEl, false);
}
},
{ rootMargin: FETCH_TRIGGER_MARGIN, threshold: 0 },
);
observer.observe(sentinel);
// Re-check the sentinel once restored pages have pushed it down.
void restored.then(() => {
observer.unobserve(sentinel);
observer.observe(sentinel);
});
}
/* istanbul ignore next -- auto-init guard */
Eif (typeof document !== "undefined") {
Iif (document.readyState === "loading") {
document.addEventListener("DOMContentLoaded", init, { once: true });
} else {
Iif (document.querySelector("[data-pros-infinite-scroll-root]")) {
init();
}
}
// Astro ClientRouter view transitions don't refire DOMContentLoaded.
// Re-init on every page-load so navigating back to /pros rebinds the
// observer. The dataset guard inside init() prevents double-binding when
// the same root persists across transitions.
document.addEventListener("astro:page-load", init);
}
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