For many years now, devices such as mobile phones have had built-in GPS locators that allow native applications to get the geographic location of the device at any given time. This functionality can now be accessed by your web applications too, using the new GeoLocation API. Although this API is not strictly part of HTML5, it is fun to play around with and so I have included it in this book.
Map data 2012 © Google
Figure 13-1 Using the GeoLocation API to highlight the nearest restaurant on the Locations page.
Getting the User’s Location
The GeoLocation API is remarkably simple to use. Browsers that support geolocation expose a
geolocation interface that has a number of methods (kind of like how you call
getElementById() on the
The main method that you will be using in this chapter is
getCurrentPosition(). This will return a