who_need_help/priv/static/offline.html

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <meta name="theme-color" content="#047b68" />
    <meta name="color-scheme" content="light dark" />
    <title>Offline · Who Need Help</title>
    <style>
      :root {
        color-scheme: light dark;
        font-family:
          Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
          "Segoe UI", sans-serif;
        background: #f7f8f7;
        color: #1c1d20;
      }

      body {
        display: grid;
        min-height: 100vh;
        margin: 0;
        place-items: center;
      }

      main {
        width: min(31rem, calc(100% - 3rem));
        text-align: center;
      }

      img {
        width: 5rem;
        height: 5rem;
      }

      h1 {
        margin: 1.5rem 0 0.75rem;
        font-size: clamp(2rem, 8vw, 3.5rem);
        line-height: 1;
      }

      p {
        margin: 0 auto;
        color: #61636a;
        font-size: 1.0625rem;
        line-height: 1.6;
      }

      button {
        margin-top: 1.75rem;
        border: 0;
        border-radius: 0.5rem;
        padding: 0.8rem 1.15rem;
        background: #a53a16;
        color: #fff;
        font: inherit;
        font-weight: 700;
        cursor: pointer;
      }

      button:focus-visible {
        outline: 3px solid #047b68;
        outline-offset: 3px;
      }

      .translations {
        margin-top: 1.25rem;
        font-size: 0.875rem;
      }

      .connection-status {
        min-height: 1.5rem;
        margin-top: 1rem;
        font-size: 0.875rem;
      }

      @media (prefers-color-scheme: dark) {
        :root {
          background: #151618;
          color: #f5f5f4;
        }

        p {
          color: #b9bbc1;
        }
      }
    </style>
  </head>
  <body>
    <main aria-labelledby="offline-title">
      <img src="/images/logo.svg" alt="" width="80" height="80" />
      <h1 id="offline-title">You're offline</h1>
      <p>
        Reconnect to view current requests, messages, maps, and live locations.
        We do not save private pages on this device.
      </p>
      <p
        id="connection-status"
        class="connection-status"
        role="status"
        aria-live="polite"
      >
        Waiting for a connection…
      </p>
      <form method="get">
        <button type="submit">Try again</button>
      </form>
      <p class="translations">
        Немає з’єднання · Нет соединения
      </p>
    </main>
    <script>
      (() => {
        const status = document.getElementById("connection-status")
        let retryTimer
        let checking = false

        const scheduleRetry = delay => {
          window.clearTimeout(retryTimer)
          retryTimer = window.setTimeout(checkConnection, delay)
        }

        const setStatus = message => {
          if (status) status.textContent = message
        }

        const checkConnection = async () => {
          if (checking) return

          checking = true
          setStatus("Checking the connection…")

          try {
            const response = await fetch("/healthz/ready", {
              cache: "no-store",
              headers: {accept: "application/json"}
            })

            if (response.ok) {
              setStatus("Connection restored. Reloading…")
              window.location.reload()
              return
            }
          } catch (_error) {
            // The next scheduled attempt handles temporary network failures.
          }

          checking = false
          setStatus("Still offline. We will keep trying.")
          scheduleRetry(3_000)
        }

        window.addEventListener("online", checkConnection)
        document.addEventListener("visibilitychange", () => {
          if (document.visibilityState === "visible") checkConnection()
        })

        scheduleRetry(navigator.onLine ? 0 : 3_000)
      })()
    </script>
  </body>
</html>