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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<title>You are offline</title>
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<!-- Inline the page's stylesheet. -->
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<style>
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body {
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font-family: helvetica, arial, sans-serif;
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margin: 2em;
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background-color: #111827;
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}
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h1 {
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color: #6366F1;
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}
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p {
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margin-block: 1rem;
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}
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button {
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display: block;
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}
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</style>
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</head>
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<body>
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<h1>You are offline</h1>
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<button type="button">↻ Reload</button>
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<!-- Inline the page's JavaScript file. -->
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<script>
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// Manual reload feature.
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document.querySelector("button").addEventListener("click", () => {
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window.location.reload();
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});
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// Listen to changes in the network state, reload when online.
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// This handles the case when the device is completely offline.
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window.addEventListener('online', () => {
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window.location.reload();
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});
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// Check if the server is responding and reload the page if it is.
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// This handles the case when the device is online, but the server
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// is offline or misbehaving.
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async function checkNetworkAndReload() {
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try {
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const response = await fetch('.');
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// Verify we get a valid response from the server
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if (response.status >= 200 && response.status < 500) {
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window.location.reload();
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return;
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}
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} catch {
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// Unable to connect to the server, ignore.
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}
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window.setTimeout(checkNetworkAndReload, 2500);
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}
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checkNetworkAndReload();
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</script>
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</body>
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</html>
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