location.js

Biscates.Location = (function() {
  var WATCH_ID;
  var POSITION;
  var GEOLOCATION_OPTIONS = {
    enableHighAccuracy: true,
    maximumAge:         600000,
    timeout:            30000   // 30 seconds     
  };
    
  function _initGeolocation() {
    var geo = navigator.geolocation;
    if (typeof geo === 'undefined') {
      // We don't have W3C geolocation. Try Gears.
      if (typeof google !== 'undefined' && google.gears &&
       google.gears.factory.create) {
        geo = google.gears.factory.create('beta.geolocation');
      }    
    }
    
    // If we have a geo object with either of these approaches, proceed
    // as planned. If not, try BlackBerry, and then fall back to Google
    // Ajax API.
    if (typeof geo !== 'undefined') {
      WATCH_ID = geo.watchPosition(
        _positionSucceeded,
        _positionFailed,
        GEOLOCATION_OPTIONS
      );
    } else {
      _positionFailed(null);
    }
  }
  
  function _init() {
    if (!window.Biscates) return;
    _initGeolocation();
  }
  
  $(window).bind('load', _init);
    
  function _positionSucceeded(position) {
    POSITION = position;
    $(window).trigger('positionSucceeded', null);
    
  }
  
  function _positionFailed(error) {
    POSITION = null;
    $(window).trigger('positionFailed', null);
  }
  
  return {    
    // Attempt to geolocate the user.
    getLocation: function() {
      var lat, lng;
      var CL = google.loader.ClientLocation;
      if (POSITION) {
        var coords = POSITION.coords;
        return [coords.latitude, coords.longitude];
      } else if (CL) {
        return [CL.latitude, CL.longitude];
      }
      
      // Fall back to downtown Austin.
      return [30.26800, -97.74283];
    }
  };
})();