index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <form>
      <button>Connect with Bluetooth Device</button>
    </form>
    <script>
      function isBleAvailable() {
        if (!navigator.bluetooth) {
          console.log("Web Ble is not available!");
          return false;
        }
        return true;
      }

      function getDeviceInfo() {
        let options = {
          acceptAllDevices: true,
          optionalServices: ["battery_service"],
        };
        console.log("Requesting Ble device info...");
        navigator.bluetooth
          .requestDevice(options)
          .then((device) => {
            console.log("Device Name: ", device.name);
            console.log("Device identify: ", device.id);
          })
          .catch((error) => {
            console.log("Request device error: ", error);
          });
      }

      document.querySelector("form").addEventListener("submit", (event) => {
        event.stopPropagation();
        event.preventDefault();

        if (isBleAvailable()) {
          getDeviceInfo();
        }
      });
    </script>
  </body>
</html>