Step one
You can use standard object testing to determine if the browser supports GeoLocation.
<script>
/**
* This function is the callback which is passed the result from the .getCurrentPosition()
* function. The pos argument can contain more information than just the latitude/longitude,
* such as altitude, accuracy and speed information.
*
* @param object pos The result from the getCurrentPosition() call
*/
function myCallback(pos)
{
var myLatitude = pos.latitude;
var myLongitude = pos.longitude;
}
/**
* Test for GeoLocation support and make the call
*/
if (navigator.geolocation) {
navigator.geolocation.getCurrentPosition(myCallback);
} else {
alert("Sorry, your browser doesn't appear to support GeoLocation");
}
</script>
Step two
Once you have tested for it, we can then retrieve the position using the getCurrentPosition() method. You pass this method a callback function which you define. This callback function is given an object (if successful), with various properties:
- latitude
- longitude
- altitude (optional)
- accuracy
- altitudeAccuracy (optional)
- heading (optional)
- speed (optional)
- timestamp
more detail go to
