Jquery实现自动提示下拉框

1、引入脚本库：
    <script type="text/javascript" src="/Jscripts/jquery-1.3.2.js"></script>

    <script src="/Jscripts/jquery.autocomplete.js" type="text/javascript"></script>
   
2、在Demo.aspx页面中加入如下脚本：
        $(document).ready(function() {
            $.ajax({
                type: "POST",
                contentType: "application/json",
                url: "Demo.aspx/GetDataBind",
                data: "{}",
                dataType: "json",
                success: function(msg) {
                    var datas = eval_r('(' + msg.d + ')');
                    $("#txtName").autocomplete(datas, {
                        max: 12,
                        minChars: 0,
                        140,
                        scrollHeight: 300,
                        matchContains: true,
                        autoFill: false, //自动填充
                        formatItem: function(row, i, max, value) {
                            return row.Key;
                        },
                        formatMatch: function(row, i, max, value) {
                            return row.Key;
                        },
                        formatResult: function(row) {
                            return row.Key;
                        }
                    }).result(function(event, row, formatted) {
                        $("#hidID").val(row.Value);
                    });
                }
            });
        });
3、页面中需要提供txtName、hidID控件：
    <asp:TextBox ID="txtName" runat="server"></asp:TextBox>
  
    <asp:HiddenField ID="hidID" runat="server" />
   
4、Demo.aspx.cs后台代码：

        [WebMethod]
        public static string GetDataBind()
        {
            Dictionary data = new Dictionary();

            IList userinfos = GetByName();
            if (userinfos != null)
            {
                foreach (Employee e in userinfos)
                {
                    data.Add(e.cName + "-" + e.eName, e.Empno);
                }
            }
            DataContractJsonSerializer serializer = new DataContractJsonSerializer(data.GetType());
            using (MemoryStream ms = new MemoryStream())
            {
                serializer.WriteObject(ms, data);
                return System.Text.Encoding.UTF8.GetString(ms.ToArray());
            }
        }