Gamepad API using navigator.getGamepads()

gamepad-getgamepads.js

var gamepad_count = 0;
function pollGamepads() {
  var gamepads = navigator.getGamepads();
  if (gamepads.length != gamepad_count) {
    gamepad_count = gamepads.length;
    for (var i = 0; i < gamepads.length; i++) {
      console.log("Gamepad %d: %s. %d buttons, %d axes",
        i, gamepads[i].id,
        gamepads[i].buttons.length, gamepads[i].axes.length);
    }
  }
}
setInterval(pollGamepads, 100);