HTML and CSS Reference
In-Depth Information
FIGURE 9.3
Mobile Safari with
a model dialog, blocking the app
from continuing.
The geolocation API exists inside the navigator object and con-
tains only three methods:
•
getCurrentPosition
•
watchPosition
•
clearWatch
The
watchPosition
and
clearWatch
are paired methods. The
watch and clear methods work the same way that
setInterval
and
setTimeout
work.
watchPosition
returns a unique identifi er
that is passed in to
clearWatch
to clear that particular watch.
As I mentioned before, both
getCurrentPosition
and
watchPosition
mirror each other and take the same arguments:
•
success handler
•
error handler
•
geolocation options
Simple usage of the geolocation API would be to pass a suc-
cess handler to the
getCurrentPosition
method:
navigator.geolocation.getCurrentPosition(function (position) {
alert('We found you!');
// now do something with the position data
});
