这是采用ajax技术,刷新是肯定的,是在我们察觉不到的速度完成.XMLHTTP牺牲页面的方法,我们之所以看不见刷新,是因为所有的工作都是在牺牲页面上进行的,里面"翻江倒海"的"折腾",我们看不见,效率上差些!
Web.Config
<?xml version="1.0"?>
<configuration>
<system.web>
<httpHandlers>
<add verb="POST,GET" path="ajax/*.ashx" type="Ajax.PageHandlerFactory, Ajax" />
<add verb="POST,GET" path="ajaxpro/*.ashx" type="AjaxPro.AjaxHandlerFactory,AjaxPro.2"/>
</httpHandlers>
</system.web>
</configuration>
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="AjaxTest.aspx.cs" Inherits="AjaxTest" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "">
<html xmlns="" >
<head runat="server">
<title>无标题页</title>
</head>
<body>
<script language="javascript" type="text/javascript">
function areaResult()
{
var area=document.getElementById("DropDownList1");
//alert(area.value);
AjaxTest.GetCityList(area.value,get_city_Result_CallBack);
}
function get_city_Result_CallBack(response)
{
if (response.value != null)
{
document.all("DropDownList2").length=0;
var ds = response.value;
if(ds != null && typeof(ds) == "object" && ds.Tables != null)
{
for(var i=0; i<ds.Tables[0].Rows.length; i++)
{
var name=ds.Tables[0].Rows[i].name;
var id=ds.Tables[0].Rows[i].id;
document.all("DropDownList2").options.add(new Option(name,id));
}
//document.all("TextBox1").value="";
}
}
return
}
</script>
<form id="form1" runat="server">
<asp:DropDownList ID="DropDownList1" runat="server">
</asp:DropDownList>
<asp:DropDownList ID="DropDownList2" runat="server">
</asp:DropDownList>
<br />
</form>
</body>
</html>
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using MeetWeb;
public partial class AjaxTest : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
AjaxPro.Utility.RegisterTypeForAjax(typeof(AjaxTest));
if (!Page.IsPostBack)
{
BindData();
}
}
private void BindData()
{
DataSet ds = new DataSet();
String sql = "Select id,name from test";
try
{
ds = GetDataSet(sql, "test");
this.DropDownList1.DataSource = ds.Tables[0];
this.DropDownList1.DataTextField = "name";
this.DropDownList1.DataValueField = "id";
this.DropDownList1.DataBind();
this.DropDownList1.Attributes.Add("onclick", "areaResult();");
}
catch (Exception ex)
{
Response.Write(ex.Message);
}
}
public static DataSet GetDataSet(string sql,string aa)
{
MeetWeb.SqlDataBase a = new MeetWeb.SqlDataBase("server=localhost\\PMSERVER;uid=sa;pwd=sa;database=test");
DataSet ds = new DataSet();
ds=a.CreateSet(sql, aa);
return ds;
}
[AjaxPro.AjaxMethod]
public DataSet GetCityList(int id)
{
string sql = "select name from test where id='" + id + "'";
return GetDataSet(sql,"test");
}
}