journal/schedule.html

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<!DOCTYPE html>
2023-11-09 18:11:16 +00:00
<!--
Copyright (c) 2023 Nikita Osokin.
Redistribution and use in source and binary forms, with or without modification, are permitted
provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this list of
conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of
conditions and the following disclaimer in the documentation and/or other materials provided
with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
-->
<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>