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Geolocation: Custom Styling

Personalize website styling based on localized user time.

// A list of 24 CSS gradients, one per hour of the day
const grads = [
[
{ color: "00000c", position: 0 },
{ color: "00000c", position: 0 },
],
[
{ color: "020111", position: 85 },
{ color: "191621", position: 100 },
],
[
{ color: "020111", position: 60 },
{ color: "20202c", position: 100 },
],
[
{ color: "020111", position: 10 },
{ color: "3a3a52", position: 100 },
],
[
{ color: "20202c", position: 0 },
{ color: "515175", position: 100 },
],
[
{ color: "40405c", position: 0 },
{ color: "6f71aa", position: 80 },
{ color: "8a76ab", position: 100 },
],
[
{ color: "4a4969", position: 0 },
{ color: "7072ab", position: 50 },
{ color: "cd82a0", position: 100 },
],
[
{ color: "757abf", position: 0 },
{ color: "8583be", position: 60 },
{ color: "eab0d1", position: 100 },
],
[
{ color: "82addb", position: 0 },
{ color: "ebb2b1", position: 100 },
],
[
{ color: "94c5f8", position: 1 },
{ color: "a6e6ff", position: 70 },
{ color: "b1b5ea", position: 100 },
],
[
{ color: "b7eaff", position: 0 },
{ color: "94dfff", position: 100 },
],
[
{ color: "9be2fe", position: 0 },
{ color: "67d1fb", position: 100 },
],
[
{ color: "90dffe", position: 0 },
{ color: "38a3d1", position: 100 },
],
[
{ color: "57c1eb", position: 0 },
{ color: "246fa8", position: 100 },
],
[
{ color: "2d91c2", position: 0 },
{ color: "1e528e", position: 100 },
],
[
{ color: "2473ab", position: 0 },
{ color: "1e528e", position: 70 },
{ color: "5b7983", position: 100 },
],
[
{ color: "1e528e", position: 0 },
{ color: "265889", position: 50 },
{ color: "9da671", position: 100 },
],
[
{ color: "1e528e", position: 0 },
{ color: "728a7c", position: 50 },
{ color: "e9ce5d", position: 100 },
],
[
{ color: "154277", position: 0 },
{ color: "576e71", position: 30 },
{ color: "e1c45e", position: 70 },
{ color: "b26339", position: 100 },
],
[
{ color: "163C52", position: 0 },
{ color: "4F4F47", position: 30 },
{ color: "C5752D", position: 60 },
{ color: "B7490F", position: 80 },
{ color: "2F1107", position: 100 },
],
[
{ color: "071B26", position: 0 },
{ color: "071B26", position: 30 },
{ color: "8A3B12", position: 80 },
{ color: "240E03", position: 100 },
],
[
{ color: "010A10", position: 30 },
{ color: "59230B", position: 80 },
{ color: "2F1107", position: 100 },
],
[
{ color: "090401", position: 50 },
{ color: "4B1D06", position: 100 },
],
[
{ color: "00000c", position: 80 },
{ color: "150800", position: 100 },
],
];
function toCSSGradient(hour) {
var css = "linear-gradient(to bottom, ";
var data = grads[hour];
var len = data.length;
for (var i = 0; i < len; i++) {
var item = data[i];
css += " #" + item.color + " " + item.position + "%";
if (i < len - 1) css += ",";
}
return css + ")";
}
async function handleRequest(request) {
let html_content = "";
let html_style = `
html{width:100vw; height:100vh;}
body{padding:0; margin:0 !important;height:100%;}
#container {
display: flex;
flex-direction:column;
align-items: center;
justify-content: center;
height: 100%;
color:white;
font-family:sans-serif;
}`;
let timeZone = request.cf.timezone;
let localized_date = new Date(
new Date().toLocaleString("en-US", { timeZone })
);
let hour = localized_date.getHours();
let minutes = localized_date.getMinutes();
html_content += "<h1>" + hour + ":" + minutes + "</h1>";
html_content += "<p>" + timeZone + "<br/></p>";
html_style += "body{background:" + toCSSGradient(hour) + ";}";
let html = `
<!DOCTYPE html>
<head>
<title>Geolocation: Customized Design</title>
</head>
<body>
<style> ${html_style}</style>
<div id="container">
${html_content}
</div>
</body>`;
return new Response(html, {
headers: {
"content-type": "text/html;charset=UTF-8",
},
});
}
export default {
fetch(request) {
return handleRequest(request);
},
};