gistfile1.js

function updateStatus() {
  window.webkitRequestAnimationFrame(updateStatus);

  var gamepads = navigator.webkitGetGamepads();
  var data = '';

  for (var padindex = 0; padindex < gamepads.length; ++padindex) {
    var pad = gamepads[padindex];
    var i;
    if (!pad) continue;
    data += '<pre>' + pad.index + ": " + pad.id + "<br/>";
    for (i = 0; i < pad.buttons.length; ++i)
      data += "button" + i + ": " + pad.buttons[i] + "<br/>";
    for (i = 0; i < pad.axes.length; ++i)
      data += "axis" + i + ": " + pad.axes[i] + "<br/>";
  }
  document.body.innerHTML = data;
}

window.webkitRequestAnimationFrame(updateStatus);