<!DOCTYPE html>
<!--
Copyright (c) 2023 Nikita Osokin.
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provided that the following conditions are met:
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<html>
<head>
<meta charset="utf-8" />
</head>
<body>
<input type=date id="date" />
<input type=button onclick="changeDay()" value="Получить расписание" />
<p></p>
<table id="schedule" border=1>
<tbody>
</tbody>
</table>
<script>
const schedule = document.getElementById("schedule");
function changeDay() {
document.location.assign("?c=" + (new URLSearchParams(document.location.search)).get("c") + "&d=" + (document.getElementById("date").valueAsNumber / 86400000).toString());
}
function uint8ArrayToNum(arr, off) {
let result = 0;
for(var i = 0; i < 8; i++) {
result <<= 8;
result |= arr[off + i];
}
return result;
}
function displayGetError(e) {
let p = document.createElement("p");
p.appendChild(document.createTextNode("Не удалось получить расписание от сервера."));
schedule.before(p);
}
function getSchedule() {
fetch(
"../scheduleGet" + document.location.search,
{
method: "GET"
}
).then(
getData,
displayGetError
);
}
function getData(response) {
if(response.status != 200) {
displayGetError();
return;
}
response.arrayBuffer().then(
displayData,
displayGetError
);
}
function displayData(dataBuffer) {
let data = new Uint8Array(dataBuffer);
let lessonsCount = uint8ArrayToNum(data, 8);
let textDecoder = new TextDecoder();
let currentOff = 16;
for(let i = 0; i < lessonsCount; i++) {
let nRow = document.createElement("tr");
let nCell1 = document.createElement("th");
nCell1.appendChild(document.createTextNode(uint8ArrayToNum(data, currentOff) + 1));
currentOff += 8;
nRow.appendChild(nCell1);
let len = uint8ArrayToNum(data, currentOff);
currentOff += 8;
let nCell2 = document.createElement("th");
nCell2.appendChild(document.createTextNode(textDecoder.decode(data.slice(currentOff, currentOff + len))));
currentOff += len;
nRow.appendChild(nCell2);
len = uint8ArrayToNum(data, currentOff);
currentOff += 8;
let nCell3 = document.createElement("th");
nCell3.appendChild(document.createTextNode(textDecoder.decode(data.slice(currentOff, currentOff + len))));
currentOff += len;
nRow.appendChild(nCell3);
schedule.children[0].appendChild(nRow);
}
}
let day = (new URLSearchParams(document.location.search)).get("d");
if(day != null) {
document.getElementById("date").valueAsNumber = day * 86400000;
}
getSchedule();
</script>
</body>
</html>