I have a webtextbox and webdropdown controls on a page and when I set a text value in the controls using javascript the custom validation see a empty controls as empty.

This is the java code I'm using

 google.maps.event.addDomListener(window, 'load', function () {
             var places = new google.maps.places.Autocomplete(document.getElementById('TextBox1'));
             google.maps.event.addListener(places, 'place_changed', function () {
                 var place = places.getPlace();
                 var address = place.formatted_address;
                 var latitude = place.geometry.location.lat();
                 var longitude = place.geometry.location.lng();
                 var mesg = "Address: " + address;
                 var addsplit = address.split(",");
                 var StatCity = addsplit[2];
                 var City = addsplit[1].trim();
                 var address = addsplit[0];
                 var Zip = addsplit[2].substring(4, 10).trim();

                 mesg += "\nLatitude: " + latitude;
                 mesg += "\nLongitude: " + longitude;
                 mesg += "\nAddess: " + addsplit[0];
                 mesg += "\nCity: " + addsplit[1];
                 mesg += "\nState: " + StatCity.substring(0,3);
                 mesg += "\nZip 3: " + addsplit[2].substring(4, 10);
                 alert(mesg);
                 var citytext = document.getElementById('PropertyCity');
                 citytext.value = City;
                 var index = 22
                 var Addresstext = document.getElementById('PropertyAddress');
                 Addresstext.value = address;

                 var zipcode = document.getElementById('PropertyZip');
                 zipcode.value = Zip;


                 var Statetext = $find('<%=PropertyState.ClientID%>');
                 var item = "Test"
                 
                 for (var i = 0; i < Statetext.get_items().getLenght() ; i++) {
                     alert(item);
                     item = Statetext.getItems().getitem(i).get_text();
                     alert(item);
                     if (item == addsplit[2].substring(0, 3).trim()) {
                         Statetext.get_items().getItem(i).select();
                     }
                 }
                 alert(item);

What am I doing wrong?