javascript - After script Geocoder form is empty -

i have 2 fields results, 1 field input: address. after clicking on button, convert() being called.

it checks googleapi longitude , latitude of given address , sets (normally hidden) 2 fields found values.

after form submits, throws out values being set. split moment, before submits takes place, see fields being set right values, , after submit values gone.

its hard explain how know that, because html it's being handled sort of asp-solution, remembers values of field , holds on it. in example, if remove submit button , replace non submit element, after click script works , fields being set.

so why, values of field not being submitted server?

again, values set first, , than, form being sumbitted.

best regards, simon

<script type="text/javascript" src="http://maps.google.com/maps/api/js?key=aizasybw2vzup4f6ykbp-bdoneuedgpfhv8mpfm"></script> <script type="text/javascript"> function convert(){ var geocoder = new google.maps.geocoder(); var address=ftform.address.value;geocoder.geocode( { 'address': address}, function(results, status) { if (status == google.maps.geocoderstatus.ok) { var latitude = results[0].geometry.location.lat(); var longitude = results[0].geometry.location.lng(); ftform.latitude.value = latitude;ftform.longitude.value = longitude;}  });  }  </script>  <form method="post" name="ftform"> lat<input type="text" name="latitude" value=""><br> long<input type="text" name="longitude" value=""><br> <br><br><br><input type="text" name="address" value="norway"> <button onclick="convert();">submit</button></form>