在ASP.NET中没有Google地图的自动位置文本框

Question

<script type="text/javascript">
        google.maps.event.addDomListener(window, 'load', function () {
            var places = new google.maps.places.Autocomplete(document.getElementById('txtfromaddress'));
            google.maps.event.addListener(places, 'place_changed', function () {
                var place = places.getPlace();
                var address = place.formatted_address;
                var latitude = place.geometry.location.k;
                var longitude = place.geometry.location.D;
                var mesg = "Address: " + address;
                mesg += "\nLatitude: " + latitude;
                mesg += "\nLongitude: " + longitude;
                alert(mesg);
            });
        });
</script>