HTML and CSS Reference
In-Depth Information
chapter thirteen
Using Geolocation
FOR MANY YEARS now, devices such as mobile phones have had built-in GPS locators that allow native applica-
tions 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 topic.
In this chapter, you learn how to use the GeoLocation API to request a user's location. You will be modifying the
Locations page so that it highlights the restaurant location that is closest to the user. To do this, you will be using the
GeoLocation API and a small JavaScript library that I have provided. Figure 13-1 shows how your Locations page
will look by the time you complete this chapter.
Map data 2012 © Google
Figure 13-1 Using the GeoLocation API to highlight the nearest restaurant on the Locations page.
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