CODEWITHSUNDEEP
phpjavascriptjquerygoogle-maps-api-3
Souza
Souza

Reputation: 1143

Geolocation with google geolocation api

So, i have this website and i need to geolocate the position of the visitor.

I saw this code at google code :

<script type="text/javascript" src="gears_init.js"></script>
<script type="text/javascript">
var geo = google.gears.factory.create('beta.geolocation');

function updatePosition(position) {
  alert('Current lat/lon is: ' + position.latitude + ',' + position.longitude);
}

function handleError(positionError) {
  alert('Attempt to get location failed: ' + positionError.message);
}

geo.getCurrentPosition(updatePosition, handleError);
</script>

Seems pretty much what i need but i must know if the visitor is near City X or if it's closer to City Y

Any way i can do this?

Upvotes: 1

Views: 1440

Answers (2)

R Ghosh
R Ghosh

Reputation: 612

Once you grab a latitude longitude pair for your visitor, to find which city they are closest to, you may want to implement a search of haversine distance combined with lat long of all cities. You can find lat long info for most cities from geonames: http://download.geonames.org/export/dump/ and more info on haversine distance is here: http://rosettacode.org/wiki/Haversine_formula

Upvotes: 0

Marcelo Zabani
Marcelo Zabani

Reputation: 2289

After you find the user's position, you need to do a reverse geolocation (see here). Then you can use the "city" field of the returned result to see where google puts this user.
If you would take a suggestion, you can also implement visitor's geolocation through HTML5's navigator.geolocation object, and with this you will also serve visitors that use other browsers that don't have google gears installed.

Upvotes: 2

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