The gamepadconnected event is fired when the browser detects that a gamepad has been connected or the first time a button/axis of the gamepad is used.

The event will not fire if disallowed by the document's gamepad Permissions Policy.

This event is not cancelable and does not bubble.

To be informed when a gamepad is connected, you can add a handler to the window using addEventListener(), like this:

window.addEventListener("gamepadconnected", (event) => {
  // All buttons and axes values can be accessed through
  const gamepad = event.gamepad;
});

Alternatively, you can use the window.ongamepadconnected event handler property to establish a handler for the gamepadconnected event:

window.ongamepadconnected = (event) => {
  // All buttons and axes values can be accessed through
  const gamepad = event.gamepad;
};

• gamepaddisconnected
• Using Gamepad API