For example when I enter an address on the http://www.infoghidromania.com/harta_romania.html website and then press submit, it should extract the GPS coordinates.
That site uses the google maps api. You can use the same API to get the longtitude/lattitude for any location you can find on google maps itself.
Javascript code example:
var geocoder = new google.maps.Geocoder();
geocoder.geocode( { 'address': '<YOUR_SEARCH_STRING_HERE>' }, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
alert("Lang/Lat : " + results[0].geometry.location.lat() + " " +results[0].geometry.location.lng());
} else {
alert('Error: ' + status);
}
});
Working examples:
Using jquery:
$(function(){
$('idOfInputField').val("content");
$('the id of the form').submit();
});
What you are looking for is called "geocoding". Google Maps has an API you can use - you can see the details here
A quick example of how to use it (assuming this is in a file called latLong.php):
<html encoding="utf-8">
<body>
Please enter address to look up:
<form method="get" action="latLong.php">
<input name="address" />
<input type="submit" />
</form>
<?php
$crlf = "<br>";
if (isset($_GET["address"])) {
$addressString = $_GET["address"];
$address = urlencode($addressString);
$googleApi = 'http://maps.googleapis.com/maps/api/geocode/json?address=%s&sensor=false';
$json = file_get_contents(sprintf($googleApi, $address));
$resultObject = json_decode($json);
$location = $resultObject->results[0]->geometry->location;
$lat = $location->lat;
$lng = $location->lng;
echo "Requested address: ".$addressString.$crlf;
echo "Latitude: ".$lat.$crlf;
echo "Longitude: ".$lng.$crlf;
}
?>
</body>
</html>