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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<!-- Required meta tags -->
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<title>Israeli Coast Waves Forecast</title>
<script language="JavaScript">
let currentDate = new Date();
let earliestDate = new Date();
earliestDate.setDate(earliestDate.getDate() - 1);
earliestDate.setHours(12, 0, 0, 0);
latestDate = new Date();
latestDate.setDate(latestDate.getDate() + 2);
latestDate.setHours(12, 0, 0, 0);
function later() {
let newDate = new Date(currentDate);
newDate.setHours(newDate.getHours() + 3);
if (newDate <= latestDate) {
currentDate = newDate;
document.getElementById("earlierButton").disabled = false;
} else {
document.getElementById("laterButton").disabled = true;
}
updateImageSource()
}
function earlier() {
let newDate = new Date(currentDate);
newDate.setHours(newDate.getHours() - 3);
if (newDate > earliestDate) {
currentDate = newDate;
document.getElementById("laterButton").disabled = false;
} else {
document.getElementById("earlierButton").disabled = true;
}
updateImageSource()
}
function getClosestThreeHourTime(hours) {
return 3 * Math.floor(hours / 3);
}
function calcImageName() {
let year = currentDate.getYear() - 100;
let month = currentDate.getMonth() + 1;
let day = currentDate.getDate();
let hour = getClosestThreeHourTime(currentDate.getHours());
if (month < 10) {
month = `0${month}`
}
if (day < 10) {
day = `0${day}`
}
if (hour < 10) {
hour = `0${hour}`
}
return `${year}${month}${day}${hour}`;
}
function calcFolderName() {
let date = new Date();
let year = date.getYear() - 100;
let month = addLeadingZero(date.getMonth() + 1);
let day = addLeadingZero(date.getDate() - 1);
return `${year}${month}${day}1200`;
}
function calcDateLabel() {
let year = currentDate.getYear() - 100;
let month = currentDate.getMonth() + 1;
let day = currentDate.getDate();
let hour = getClosestThreeHourTime(currentDate.getHours());
if (month < 10) {
month = `0${month}`
}
if (day < 10) {
day = `0${day}`
}
if (hour < 10) {
hour = `0${hour}`
}
return `${day}/${month}/${year} ${hour}:00`;
}
function addLeadingZero(number) {
if (number < 10) {
return `0${number}`
} else {
return `${number}`
}
}
function updateImageSource() {
let imageName = calcImageName();
let folderName = calcFolderName();
let dateLabel = calcDateLabel();
let imageSrc = `https://isramar.ocean.org.il/isramar2009/wave_model/wave_maps/swan/${folderName}/israel/${imageName}.wavedir.gif`
document.getElementById("wavesImage").src = imageSrc;
document.getElementById("dateLabel").innerText = dateLabel;
}
function onLoad() {
let imageName = calcImageName();
updateImageSource(imageName)
}
</script>
<style>
img {
max-width: 100%;
height: auto;
}
.buttons-container {
display: flex;
justify-content: space-between;
align-items: baseline;
}
</style>
<!-- Bootstrap -->
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<link rel="stylesheet" href="./style.css">
</head>
<body onload="onLoad()">
<div class="container">
<div class="map-container">
<img id="wavesImage" alt="Missing image" src="a.img">
</div>
<div class="buttons-container">
<button id="earlierButton" type="button" class="btn btn-outline-dark" onclick="earlier()">Previous</button>
<label id="dateLabel">Date</label>
<button id="laterButton" type="button" class="btn btn-outline-dark" onclick="later()">Next</button>
</div>
<div class="copyright">
<br>
© Israel Oceanographic & Limnological Research. All Rights Reserved
</div>
</div>
<!-- Bootstrap requirements -->
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
</body>
</html>