Coolite自定义验证,VType

Code
Ext.apply(Ext.form.VTypes, {
         repetition: function(val, field) {     //返回true，则验证通过，否则验证失败
             var isValid='';
             Coolite.AjaxMethods.<%=this.ClientID %>.GetHospital(val,{
                success:function(result){
                    alert(result);
                    isValid=result;
                },
                failure:function(errorMsg)
                {
                    Ext.Msg.alert('失败',errorMsg);
                }
             });
             alert(isValid);
             if (isValid=='true')
             {
                return  true;
             }
             else
             {
                return false;
             }
         },
         repetitionText: '当前医院已经存在!'
        })

< ext:Anchor  Horizontal ="95%" >
                 < ext:TextField  runat ="server"  ID ="dataFullName"  FieldLabel ="医院全称"   Vtype ="repetition"  AllowBlank ="false" ></ ext:TextField >
             </ ext:Anchor >

Code
[AjaxMethod]
        public bool GetHospital(string id)
        {
            List<HospitalInfo> listhospitals = HospitalController.Current.GetByWhereClause("FullName like '%" + id + "%'", "");
            if (listhospitals.Count > 0)
            {
                return false;
            }
            else
            {
                return true;
            }
        }

 

功能就是在输入内容的时候，动态的进入后台，验证次数据是否存在