geolocation lookup that accepts an error-first callback

geolocation.js

// Asynchronous retrieval of coordinates
function getCoordinates(cb) {
  // Grab geolocation from the navigator
  var geolocation = window.navigator.geolocation;

  // If geolocation exists, start fetching location
  if (geolocation) {
    geolocation.getCurrentPosition(function (position) {
      cb(null, position.coords);
    }, cb);
  } else {
  // Otherwise, callback with an error
    cb(1);
  }
}

z_example.js

$(function () {
  // Grab the output and the geolocation
  var $geoOutput = $('#geoOutput');

  getCoordinates(function (err, coords) {
    // If there was an error, update the text accordingly
    if (err) {
      $geoOutput.text('Geolocation could not be used =(');
    } else {
    // Otherwise, output the coordinates
      $geoOutput.text('Geolocation found!! Lat: ' + coords.latitude + ' Lng: ' + coords.longitude);
    }
  });
});