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jal-sakitoku.html
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<!DOCTYPE html>
<html>
<head>
<title>JAL先得カレンダー色分け</title>
<script type="text/javascript" src="https://code.jquery.com/jquery-3.6.0.min.js"></script>
<script type="text/javascript">
var DEBUG = false;
$(function(){
const now = new Date();
const $calendars = $("#calendars");
const sample_pairs = [[now.getFullYear(), now.getMonth() + 1]];
while ( sample_pairs.length <= 11 ) {
sample_pairs.push( get_next_ym(...sample_pairs[sample_pairs.length - 1] ) );
}
console.log(sample_pairs);
for ( const [year, month] of sample_pairs ) {
$calendars.append(render_calendar(year, month));
}
});
const LAST_DAY = [undefined, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
function get_lastday(year, month) {
if ( month !== 2 ) {
return LAST_DAY[month];
}
// 2000年の例外 (400) は考慮していない
return year % 4 === 0 ? 29 : 28;
}
function get_next_ym(year, month) {
return month === 12 ? [year + 1, 1] : [year, month + 1];
}
function range(start, end) {
const array = [];
for ( let i = start ; i <= end ; i++ ) {
array.push(i);
}
return array;
}
function get_calendar_matrix(year, month) {
const day1 = new Date(year, month - 1, 1);
const week1 = day1.getDay();
const lastday = get_lastday(year, month);
const month_sequence = range(1, lastday);
if ( week1 > 0 ) {
month_sequence.unshift( ...Array(week1) );
}
const calendar_matrix = [];
while( month_sequence.length > 0 ) {
const current_week = month_sequence.splice(0, 7);
if ( current_week.length < 7 ) {
current_week.push(...Array( 7 - current_week.length ));
}
calendar_matrix.push(current_week);
}
return calendar_matrix;
}
function get_days_after(year, month, day) {
const date = new Date(year, month-1, day);
const now = new Date();
for ( const key of ["Hours", "Minutes", "Seconds", "Milliseconds"] ) {
now["set"+key](0)
}
const diff = date.getTime() - now.getTime();
const diffdate = diff / 1000 / 86400;
return diffdate;
}
function render_calendar(year, month) {
const matrix = get_calendar_matrix(year, month);
const lines = [];
lines.push(`<caption>${year}年${month}月</caption>`);
lines.push(
`<thead><tr>` +
`<th class="sunday">日</th>` +
"月 火 水 木 金".split(/ /).map( w => `<th>${w}</th>`).join("") +
`<th class="saturday">土</th>` +
`</tr></thead>`
);
lines.push(`<tbody>`);
for ( const row of matrix ) {
// 何日前か判定して、色分けする
// 21 28 45 55 75 ~330
// TODO: 休日APIで休日を赤く表示させたい
const row2 = row.map( d => [d, get_days_after(year, month, d)]);
row2.forEach( ar => ar.push(get_jal_days_after(ar[1])) );
lines.push( `<tr>` +
row2.map( ([d, da, jda]) => `<td class="jal_days_after_${jda || "other"} ${da === 0 ? "today" : ""}">${d || "-"}</td>` ).join("") + `</tr>`);
}
lines.push(`</tbody>`);
return `<table id="calendar_${year}_${month}" class="calendar">
${lines.join("\n")}
</table>`;
}
function get_jal_days_after( days_after ) {
if ( days_after < 21 ) {
return undefined;
} else if ( days_after < 28 ) {
return 21;
} else if ( days_after < 45 ) {
return 28;
} else if ( days_after < 55 ) {
return 45;
} else if ( days_after < 75 ) {
return 55;
} else if ( days_after <= 330 ) {
return 75;
} else {
return undefined;
}
}
// https://www.jal.co.jp/dom/sakitoku/index.html?sta=HND&ena=OBO&y=2022&m=1
</script>
<style type="text/css">
.sunday { color: red }
.saturday { color: blue }
table.calendar {
border: 2px solid black;
border-collapse: collapse;
display: inline-table;
margin: 0.5em;
}
table.calendar td,
table.calendar th {
border: 1px solid black;
text-align: center;
width: 2em;
height: 2em;
}
table.calendar td.today {
font-weight: bold;
color: darkorange
}
table.calendar thead tr {
border-bottom: 2px solid black;
background: lightgray;
}
.jal_days_after_21 { background-color: rgb(250, 250, 54) }
.jal_days_after_28 { background-color: rgb(128, 233, 119) }
.jal_days_after_45 { background-color: rgb(154, 227, 240) }
.jal_days_after_55 { background-color: rgb(116, 164, 219) }
.jal_days_after_75 { background-color: rgb(216, 119, 119) }
</style>
</head>
<body>
<p>詳細は<a href="https://www.jal.co.jp/dom/sakitoku/index.html">先得カレンダー</a>を参照。</p>
<p>凡例：
<span class="jal_days_after_21">21日前</span>、
<span class="jal_days_after_28">28日前</span>、
<span class="jal_days_after_45">45日前</span>、
<span class="jal_days_after_55">55日前</span>、
<span class="jal_days_after_75">75日前</span>
</p>
<div id="calendars">
</div>
</body>
</html>