31 lines
1.2 KiB
JavaScript
31 lines
1.2 KiB
JavaScript
const runChat = async () => {
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const frenId =
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new URLSearchParams(document.location.search).get("fren_id") ??
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document.getElementById("fren_id").value;
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const html = await fetch(`/chat/messages?fren_id=${frenId}`).then((r) =>
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r.text(),
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);
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const { scrollTop, scrollHeight, clientTop } = document.getElementById(
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"chat-container",
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) ?? { scrollTop: 0, scrollHeight: 0, clientTop: 0};
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const scrollTopMax = scrollHeight - clientTop;
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const isAtEdge = scrollTop > (0.92 * scrollTopMax) || scrollTop === 0;
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document.getElementById("messages").innerHTML = html;
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await new Promise((res) => setTimeout(res, 200)); // wait for html to emplace.
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if (!document.getElementById("chat-container")) return;
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const emplacedScrollTopMax = document.getElementById("chat-container").scrollHeight - document.getElementById("chat-container").clientTop;
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if (isAtEdge) {
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document.getElementById("chat-container").scrollTop = scrollTopMax;
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} else {
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// save the position.
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document.getElementById("chat-container").scrollTop = scrollTop;
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}
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};
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setTimeout(() => {
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if (document.location.pathname.startsWith("/chat")) {
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runChat().then(() => setInterval(runChat, 2_500));
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}
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}, 200);
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