var geoSearch = new google.maps.Geocoder;
jQuery(document).ready(function() {
var address = FYN_search.postcode;
if(jQuery.type( address ) === "string"){
    var region = 'Austria';
    address = address + ', ' + region;
    geoSearch.geocode({'address':address,'region':region},function(results, status){
        if (status == google.maps.GeocoderStatus.OK) {
            var point = results[0].geometry.location;
            var data={
                action:'filter_search',
                lat:point.lat(),
                lng:point.lng()
            }

            jQuery.post(FYN_search.ajaxurl, data, function(returndata){
                console.log('ajax posting');
                jQuery('#resulit').html(returndata);
            });

        } else {
            alert("Geocode was not successful for the following reason: " + status);
        }
    });
}
});

add_action('wp_ajax_filter_search', 'filter_search_result');

   function filter_search_result(){
           echo 'hello world';
 }