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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 | 1x 10x 17x 17x 17x 11x 4x 14x 14x 14x 2x 12x 12x 12x 2x 12x 1x 1x 1x 2x 4x 12x 12x 10x 10x 9x 9x 9x 9x 9x 9x 9x 8x 16x 8x 7x 7x 7x 7x 1x 1x 1x 6x 6x 5x 4x 4x 4x 4x 3x 1x 1x 1x 2x 2x 1x 1x 1x 1x 1x 4x 4x 6x 1x 1x 1x | // Infinite-scroll for /projects. Fetches server-rendered ProjectCard HTML
// fragments and appends to both the mobile swipe deck and the desktop grid.
// SSR Pagination stays in the DOM as a <noscript> fallback for crawlers.
export type InfiniteScrollState = {
currentPage: number;
totalPages: number;
loading: boolean;
done: boolean;
};
export const FETCH_TRIGGER_MARGIN = "600px"; // how early to prefetch the next page
export function readInitialState(root: HTMLElement): InfiniteScrollState {
return {
currentPage: parseInt(root.dataset.currentPage || "1", 10),
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));
// Fragment endpoint preserves all other filters via the query string.
return `/api/projects-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;
}
if (html.trim()) {
// The fragment response includes a leading <style> for scoped component
// CSS (and in dev, a Vite HMR <script>). Blob-inserting would add those
// as sibling children of the grid — parse and pluck only the card roots.
const parsed = new DOMParser().parseFromString(html, "text/html");
const cards = parsed.querySelectorAll<HTMLElement>(
".flex.flex-col.h-full.bg-background-elevated",
);
for (const grid of grids) {
for (const card of cards) {
grid.appendChild(card.cloneNode(true));
}
}
}
state.currentPage = nextPage;
// Intentionally do NOT update the browser URL. Sharing a URL with ?page=N
// would SSR only that single page's slice (see /projects/index.astro),
// leaving recipients with a partial deck and a counter that lies. Keeping
// the URL at /projects means shared links always load the full infinite
// scroll from the start.
return nextPage >= state.totalPages;
}
export function init() {
const root = document.querySelector<HTMLElement>("[data-infinite-scroll-root]");
if (!root) return;
// Mobile uses CardGrid's internal swipe deck (marked with data-scroll-deck).
// Desktop uses a dedicated marker we add in index.astro.
const mobileGrid = root.querySelector<HTMLElement>("[data-scroll-deck]");
const desktopGrid = document.querySelector<HTMLElement>(
'[data-projects-grid="desktop"]',
);
const sentinel = document.querySelector<HTMLElement>(
"[data-projects-sentinel]",
);
const loadingEl = document.querySelector<HTMLElement>(
"[data-projects-loading]",
);
const endEl = document.querySelector<HTMLElement>("[data-projects-end]");
const ssrPagination = document.querySelectorAll<HTMLElement>(
"[data-ssr-pagination]",
);
if (!sentinel) return;
const grids = [mobileGrid, desktopGrid].filter(
(g): g is HTMLElement => g !== null,
);
if (grids.length === 0) return;
// JS is running — hide SSR page-number pagination. The <noscript> copy
// underneath stays in the DOM for crawlers.
for (const el of ssrPagination) {
el.hidden = true;
}
const state = readInitialState(root);
if (state.currentPage >= state.totalPages) {
state.done = true;
showEndMessage(endEl);
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 {
// IntersectionObserver only fires on transition. If the sentinel is
// still within the trigger zone after we appended cards (common on
// short mobile pages where the horizontal deck doesn't grow the
// document), re-observe so the next page loads too.
observer.unobserve(sentinel);
observer.observe(sentinel);
}
} catch (err) {
console.error("[projects] infinite scroll fetch failed", err);
// Surface SSR pagination again so the user still has a way forward.
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);
}
// Auto-init at module load (entry-point behavior). Guarded so tests can
// import helpers without triggering init() in jsdom.
/* istanbul ignore next -- auto-init guard */
Eif (typeof document !== "undefined") {
Iif (document.readyState === "loading") {
document.addEventListener("DOMContentLoaded", init, { once: true });
} else {
// Only auto-init if the root element exists — prevents jsdom-import-time
// side-effects in tests that haven't built a fixture yet.
Iif (document.querySelector("[data-infinite-scroll-root]")) {
init();
}
}
}
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