HTML and CSS Reference
In-Depth Information
The success callback is passed a
position
object that contains a
coordinates
object and
a timestamp. The
coordinates
object contains the following:
•
latitude
, which is specified in decimal degrees
•
longitude
, which is specified in decimal degrees
•
altitude
, which is specified in meters above the ellipsoid
•
accuracy
, which is specified in meters
•
altitudeAccuracy
, which is specified in meters
•
heading
, which is the direction of travel specified in degrees
•
speed
, which is specified in meters per second
Of those seven, only three are guaranteed to be there:
latitude
,
longitude
, and
accuracy
.
For the solution, take the
latitude
and
longitude
and append them to the body of the
web page using jQuery:
function printLatLong(lat, long) {
$('body').append('<p>Lat: ' + lat + '</p>');
$('body').append('<p>Long: ' + long + '</p>');
}
See Also
The W3C Geolocation specification at
http://dev.w3.org/geo/api/spec-source.html
.
8.2 Getting Basic Geolocation Data with a Fallback
Problem
You want to determine a user's Internet location when that user's browser does not
support the HTML5 Geolocation API natively.
Solution
Perform an IP-to-location lookup as a fallback. It's certainly not as accurate as latitude
and longitude coordinates, but it's far better than not having any location data at all.
Google versus MaxMind
Google offers the
google.loader.ClientLocation
object in its Google Maps API v3
library, but it does not work for many US IP addresses.
The MaxMind GeoIP JavaScript Web Service seems more accurate and up-to-date.
Also, it's free as long as you link back to the
http://www.maxmind.com
website. Alter-
natively, MaxMind offers a JavaScript attribution-free license that can be purchased
for $250/year.
