ASP.NET输入文本框自动提示功能

<script src="../js/jquery-1.4.2.js" type="text/javascript"></script> 
 
<link href="../js/jquery.autocomplete.css" rel="stylesheet" type="text/css" /> 
 
<script src="../js/jquery.autocomplete.js" type="text/javascript"></script> 

<script type="text/javascript"> 
  $(function(){ 
    $("#<%=txtSfzh.ClientID %>").autocomplete("../services/SearchSyryInfoService.ashx",{ 
      width: 500, 
      max: 20, 
      delay: 5, 
      cacheLength: 1, 
      formatItem: function(data, i, max) { 
        return data.toString(); 
      }, 
      formatResult: function(data) { 
        return data.toString().split(",")[1]; 
      } 
    }).result(function(event, data, formatted) { 
      var array = data.toString().split(","); 
      $("#<%=txtXm.ClientID %>").val(array[0]);//姓名 
      $("#<%=txtSfzh.ClientID %>").val(array[1]);//身份证号 
      $("#<%=txtJtzz.ClientID %>").val(array[2]);//家庭住址 
      $("#<%=txtLxdh.ClientID %>").val(array[3]);//联系电话 
    }); 
  }); 
</script> 

<table cellpadding="0" cellspacing="0" border="1" width="100%"> 
      <tr> 
        <td> 
          <label> 
            身份证号</label> 
        </td> 
        <td> 
          <asp:TextBox runat="server" ID="txtSfzh" /> 
        </td> 
        <td> 
          <label> 
            姓名</label> 
        </td> 
        <td> 
          <asp:TextBox runat="server" ID="txtXm" /> 
        </td> 
      </tr> 
      <tr> 
        <td> 
          <label> 
            家庭地址</label> 
        </td> 
        <td> 
          <asp:TextBox runat="server" ID="txtJtzz" /> 
        </td> 
        <td> 
          <label> 
            联系电话</label> 
        </td> 
        <td> 
          <asp:TextBox runat="server" ID="txtLxdh" /> 
        </td> 
      </tr> 
      <tr align="center"> 
        <td colspan="4"> 
          <asp:Button ID="btnSearch" runat="server" Text="查询" Width="80px" OnClick="btnSearch_Click" />  
          <asp:Button ID="btnReset" runat="server" Text="重置" Width="80px" OnClick="btnReset_Click" /> 
        </td> 
      </tr> 
    </table> 

public void ProcessRequest(HttpContext context) 
  { 
    context.Response.ContentType = "text/plain"; 
 
    if (context.Request.QueryString["q"] != null) 
    { 
      string key = context.Request.QueryString["q"]; 
      if (key.Trim().Length >= 8)//大于等于8位，才去查数据库。这是为了缓解数据库查询的压力，只当输入了8位以上身份证以后才进行数据库检索。 
      { 
        string keyValues = GetKeyValues(key); 
        context.Response.Write(keyValues); 
      } 
    } 
  } 
 
  public bool IsReusable 
  { 
    get 
    { 
      return false; 
    } 
  } 
 
  public static string GetKeyValues(string key) 
  { 
    BLL bll = new BLL(); 
    DataTable dt = bll.GetPersons(key).Tables[0];//通过关键字k（k是前台页面输入的身份证号码）到后台去查询人员信息并返回一个结果集 
    StringBuilder sb = new StringBuilder(); 
    foreach (DataRow dr in dt.Rows) 
    { 
      sb.Append(dr["result"].ToString() + "\n"); 
    } 
    return sb.ToString().Trim(); 
  }