Geolocation - HTML5 - page 169

$('body').append('<p><a href="http://www.maxmind.com" target="_blank">IP
to Location Service Provided by MaxMind</a></p>');
}
}
function error(msg) {
alert(msg);
}
Discussion
Get the coordinates from getCurrentPosition() and pass them to a printAddress()
function, which uses the Google Maps API to do the reverse geocoding.
The printAddress() function begins by creating a new Google Geocoder object. The
Geocoder object gives us access to the geocode() method, which can take in a variety of
options and return information based on them.
In our case, we're using the google.maps.LatLng() method to create a new Google
LatLng object that is passed into geocode() in order to get the address. The geocode()
method is asynchronous, just like getCurrentPosition() , so we define an inline Java-
Script function to handle the callback.
The callback's response contains two parameters, one for the results and the other for
the status code. If the status is OK , then it's safe to parse the array of GeocoderRe
sults objects stored in the results variable. The results variable is an array since
Geocoder may return more than one entry.
Next, check for a GeocoderResults object in the first position of the array and, if it exists,
append the formatted_address property to the web page's body.
See Also
For more information about reverse geocoding, see http://code.google.com/apis/maps/
documentation/javascript/services.html#ReverseGeocoding .
8.4 Converting an Address into Latitude and Longitude
Problem
You want to turn an address into latitude and longitude coordinates.
Solution
Use the Google Maps JavaScript API V3 to turn an address into latitude and longitude,
as shown in Figure 8-3 . This is called geocoding .