HTML5 : Geolocation with Fallback

gistfile1.js

// geo-location shim

// currentely only serves lat/long
// depends on jQuery

;(function(geolocation){

  if (geolocation) return;
  
  var cache;
  
  geolocation = window.navigator.geolocation = {};
  geolocation.getCurrentPosition = function(callback){
    
    if (cache) callback(cache);
    
    $.getScript('//www.google.com/jsapi',function(){
      
      cache = {
        coords : {
          "latitude": google.loader.ClientLocation.latitude, 
          "longitude": google.loader.ClientLocation.longitude
        }
      };
      
      callback(cache);
    });
    
  };
  
  geolocation.watchPosition = geolocation.getCurrentPosition;

})(navigator.geolocation);



// usage
navigator.geolocation.watchPosition(function(pos){
  console.log("I'm located at ",pos.coords.latitude,' and ',pos.coords.longitude);
});