google_map_int.js

    var markers = [];
    var geocoder = new google.maps.Geocoder();
    var local_search = new GlocalSearch();
    var default_point = new google.maps.LatLng(53.800651, -4.064941);
    var default_map = {
      zoom: 5,
      center: default_point,
      mapTypeControl: true,
      mapTypeControlOptions: {style: google.maps.MapTypeControlStyle.DROPDOWN_MENU},
      mapTypeId: google.maps.MapTypeId.ROADMAP
    };
    
    $(document).ready(function()
    {
      var map = new google.maps.Map(document.getElementById("map_canvas"), default_map);
      
      $('input[name="postcode"]').blur(function(){
        clear_markers();
        var address = [];
        $('#address_1, #address_2, #address_3, #address_4').each(function(){
          if ($(this).val()!='') address.push($(this).val());
        });
        address.push($(this).val(), 'UK');
        
/*
        geocoder.geocode( { 'address': address.join(', ')}, function(results, status) {
          if (status == google.maps.GeocoderStatus.OK){
            var point = results[0].geometry.location;
            map.setCenter(point);
            map.setZoom(16);
            var marker = new google.maps.Marker({
                map: map, 
                position: point,
                draggable: true
            });
            markers.push(marker);
            update_coords(point);
            google.maps.event.addListener(marker, 'dragend', function() {
              update_coords(marker.get_position());
            });
          } else {
            alert("Geocode was not successful for the following reason: " + status);
          }
        });
*/
        my_geocoder(address, function(point){
          map.setCenter(point);
          map.setZoom(16);
          var marker = new google.maps.Marker({
              map: map, 
              position: point,
              draggable: true
          });
          markers.push(marker);
          update_coords(point);
          google.maps.event.addListener(marker, 'dragend', function() {
            update_coords(marker.get_position());
          });
        });
        
      });      
      

      
    });
    
    function update_coords(point){
      $('#lattitude').val(point.lat());
      $('#longitude').val(point.lng());
    }
    
    function clear_markers(){
      for(var i=0; i<markers.length; i++){
        markers[i].set_map(null);
      }
      markers.length = 0;
    }
    
    function my_geocoder(address, callback_function){
      local_search.setSearchCompleteCallback(null, function(){
        if (local_search.results[0]){    
          var lat = local_search.results[0].lat;
          var lng = local_search.results[0].lng;
          var point = new google.maps.LatLng(lat, lng);
          callback_function(point);
        }
        else{
          alert("Postcode not found!");
        }
      });  
      local_search.execute(address + ", UK");
    }