The connect event of the SerialPort interface is fired when a port has connected to the device. This event is only fired for ports associated with removable devices such as those connected via USB.

This event bubbles to the instance of Serial that returned this interface.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener("connect", (event) => {});

onconnect = (event) => {};

A generic Event.

This event bubbles to Serial. The event.target property refers to the SerialPort object that bubbles up.

For more information, see Event bubbling.

The Serial.requestPort() method returns a Promise that resolves with a SerialPort chosen by the user.

// Prompt user to choose a serial port
const port = await navigator.serial.requestPort();

port.addEventListener("connect", (event) => {
  // notify that the chosen port is connected
});

The connect event bubbles up to the Serial object where you can listen for any newly-connected ports.

navigator.serial.addEventListener("connect", (event) => {
  // notify that a new port is available
  // use `event.target` to refer to the newly-added port
});

• disconnect event