N 个 ASP.net DropDownList 无刷新联动菜单
以下代码绝对可以使用，也可以实现多级菜单。。。。
<script language="javascript">
function load(state)
{
var drp2 = document.getElementById("DropDownList2");
for(var i=0;i<=drp2.options.length-1;i++)
{
drp2.remove(i);
}
var oHttpReq = new ActiveXObject("MSXML2.XMLHTTP"); //发送请求
var oDoc = new ActiveXObject("MSXML2.DOMDocument"); //响应结果
var state=document.getElementById("DropDownList1").value;
oHttpReq.open("post","webform2.aspx?state="+state, false);
oHttpReq.send("");
result = oHttpReq.responseText;
oDoc.loadXML(result);
// items = oDoc.selectNodes("//CITY/Table");
items = oDoc.selectNodes("//address/Table");
for (var item = items.nextNode();item;item = items.nextNode())
{
var city = item.selectSingleNode("//address").nodeTypedValue;
var newOption = document.createElement("OPTION");
newOption.text = city;
newOption.value = city;
drp2.options.add(newOption);
}
}
</script>
============================
webform1.aspx
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
if(!IsPostBack)
{
SqlConnection con = new SqlConnection("packet size=4096;user id=sa;data source=SERVER;persist security info=False;initial catalog=pubs");
SqlDataAdapter da = new SqlDataAdapter("select state from authors group by state",con);
DataSet ds = new DataSet("State");
da.Fill(ds);
this.DropDownList1.DataSource = ds.Tables[0];
this.DropDownList1.DataTextField = "state";
this.DropDownList1.DataValueField = "state";
this.DropDownList1.DataBind();
this.DropDownList1.Attributes.Add("onchange","load()");
//DropDownList1.
}
}
webform2.aspx
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
if(this.Request["state"]!=null)
{
string state = this.Request["state"].ToString();
SqlConnection con = new SqlConnection("packet size=4096;user id=sa;data source=SERVER;persist security info=False;initial catalog=pubs");
SqlDataAdapter da = new SqlDataAdapter("select address from authors where state = '"+state+"'",con);
DataSet ds = new DataSet("address");
da.Fill(ds);
XmlTextWriter writer = new XmlTextWriter(Response.OutputStream, Response.ContentEncoding);
writer.Formatting = Formatting.Indented;
writer.Indentation = 4;
writer.IndentChar = ' ';
ds.WriteXml(writer);
writer.Flush();
Response.End();
writer.Close();
}
}
---------------------------------
仔细看看``其实完全不用在响应多个DROPLIST的时候牺牲 N-1 个页面，因为所有的响应都有一个共性，为什么不可以多传一个值进行判断响应那一个方法呢？？？
var type ="type1";
oHttpReq.open("post","webform2.aspx?state="+state+"&type="+type, false);
string type = this.Request["type"].ToString();
switch(type)
{
case "type1":
.........................................
}
----------------------------------------------
程序需要做几处修改：
1、解决drp2、drp3清楚不完全的问题： drp2.innerText =""; drp3.......................
2、
for (var item = items.nextNode();item;item = items.nextNode())
{
var city = item.nodeTypedValue;
var newOption = document.createElement("OPTION");
newOption.text = city;
newOption.value = city;
drp2.options.add(newOption);
}
3、如果传多个值的问题也是一样``
select t1,t2 from tt
只要多加一个条件就可以解决问题
=======================================================
这个还有很多可以研究的问题``比如刷新后值的问题。。。。。。。。。。。。
Trackback: http://tb.blog.csdn.net/TrackBack.aspx?PostId=548121
程序演示地址：http://www.718.com.cn/other/Example.aspx
在网上看到了一些无刷新的联动控件。下下了测试以后，显示英文和数字可以，但是不可以显示中文，后来把从网上down下来的文件做了一个翻修改，做了一个省市的联动控件。给大家共享一下。可以显示中文了。
<%@ Page language="c#" Codebehind="Example.aspx.cs" AutoEventWireup="false" Inherits="Webs.other.Example" %>
<HTML>
<HEAD>
<title>Example</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
<script>
function load(state){
var drp2 = document.getElementById("DropDownList2");
for (i = drp2.length; i >= 0; i--){
drp2.options.remove(i);
}
var oHttpReq = new ActiveXObject("MSXML2.XMLHTTP");
var oDoc = new ActiveXObject("MSXML2.DOMDocument");
oHttpReq.open("POST", "getData.aspx?state="+state, false);
oHttpReq.send("");
result = oHttpReq.responseText;
oDoc.loadXML(result);
items1 = oDoc.selectNodes("//CITY/Table/Id");
items2 = oDoc.selectNodes("//CITY/Table/shiname");
var itemsLength=items1.length;
for(i=0;i<itemsLength;i++)
//将小类的类名和编号赋予DropDownList2
{
var newOption = document.createElement("OPTION");
newOption.text=items2[i].text;
newOption.value=items1[i].text;
drp2.options.add(newOption);
}
}
window.onload = function(){load('1');}
</script>
</HEAD>
<body MS_POSITIONING="FlowLayout">
<form id="Form1" method="post" runat="server">
<asp:DropDownList id="DropDownList1" runat="server"></asp:DropDownList>
<asp:DropDownList id="DropDownList2" runat="server"></asp:DropDownList>
<asp:TextBox id="TH" runat="server"></asp:TextBox>
<asp:Button id="Button1" runat="server" Text="Button"></asp:Button>
</form>
</body>
</HTML>
cs源文件:
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
namespace Webs.other
{
/// <summary>
/// Example 的摘要说明。
/// </summary>
public class Example : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DropDownList DropDownList1;
protected System.Web.UI.WebControls.TextBox TH;
protected System.Web.UI.WebControls.Button Button1;
protected System.Web.UI.WebControls.DropDownList DropDownList2;
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
if(!this.IsPostBack)
{
// 建立数据源加载第一个DropDownList，也可以默认加载第二个
SqlConnection con = new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings.Get("connStr1"));
SqlDataAdapter da = new SqlDataAdapter("select Id,shengname from Province",con);
DataSet ds = new DataSet();
da.Fill(ds);
this.DropDownList1.DataSource = ds;
this.DropDownList1.DataTextField = "shengname";
this.DropDownList1.DataValueField = "Id";
this.DropDownList1.DataBind();
// 这里是绑定客户端事件，当第一个DropDownList的选项改变时激发下面的事件onchange，这个事件将调用一个客户端方法load()
this.DropDownList1.Attributes.Add("onchange","load(this.options[this.selectedIndex].value)");
}
}
#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN：该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Button1.Click += new System.EventHandler(this.Button1_Click);
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
private void Button1_Click(object sender, System.EventArgs e)
{
TH.Text=this.Request.Form["DropDownList2"].ToString();
}
}
}
getdata源文件
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.Xml;
using System.Configuration;
using System.Text;
namespace Webs.other
{
/// <summary>
/// GetData 的摘要说明。
/// </summary>
public class GetData : System.Web.UI.Page
{
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
//Response.Write(Request["state"]);
int shengNo=int.Parse(Request["state"].ToString());
SqlConnection con = new SqlConnection(System.Configuration.ConfigurationSettings.AppSettings.Get("connStr1"));
SqlDataAdapter da = new SqlDataAdapter("select Id,shiname from City where Shengid='"+shengNo+"'",con);
DataSet ds = new DataSet("CITY");
da.Fill(ds);
XmlTextWriter writer = new XmlTextWriter(Response.OutputStream,Encoding.UTF8);
writer.Formatting = Formatting.Indented;
writer.Indentation = 4;
writer.IndentChar = ' ';
writer.WriteStartDocument();
ds.WriteXml(writer);
writer.Flush();
Response.End();
writer.Close();
}
#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN：该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
}
}
Trackback: http://tb.blog.csdn.net/TrackBack.aspx?PostId=472917
ASP.net DropDownList 无刷新联动！ <SCRIPT language='javascript'>
function load(){
var drp2 = document.getElementById("DropDownList2");
drp2.innerText="";
for(var i = 0;i<=drp2.options.length -1;i++){
drp2.remove(i);
}
var drp3 = document.getElementById("DropDownList3");
for(var i = 0;i<=drp3.options.length -1;i++){
drp3.remove(i);
}
var xmlhttp = new ActiveXObject("MSXML2.XMLHTTP");
var oDoc = new ActiveXObject("MSXML2.DOMDocument");
var state=document.getElementById("DropDownList1").value;
xmlhttp.open("POST", "webform1.aspx?id="+state,false);
xmlhttp.send("");
var res=oDoc.loadXML(xmlhttp.responseText);
var naItems = oDoc.selectNodes("//Market/Table/maName");
var idItems = oDoc.selectNodes("//Market/Table/maId");
var item;
var id;
for (item = naItems.nextNode(),id=idItems.nextNode(); item&&id; item = naItems.nextNode(),id=idItems.nextNode()){
var nastr = item.nodeTypedValue;
var idstr = id.nodeTypedValue;
var newOption = document.createElement("OPTION");
newOption.text =nastr;
newOption.value = idstr;
drp2.options.add(newOption);
}
load2();
}
function load2(){
var drp2 = document.getElementById("DropDownList3");
drp2.innerText="";
for(var i = 0;i<=drp2.options.length -1;i++){
drp2.remove(i);
}
var xmlhttp = new ActiveXObject("MSXML2.XMLHTTP");
var oDoc = new ActiveXObject("MSXML2.DOMDocument");
var state=document.getElementById("DropDownList2").value;
xmlhttp.open("POST", "webform3.aspx?id="+state,false);
xmlhttp.send("");
var res=oDoc.loadXML(xmlhttp.responseText);
var naItems = oDoc.selectNodes("//Market/Table/maName");
var idItems = oDoc.selectNodes("//Market/Table/maId");
var item;
var id;
for (item = naItems.nextNode(),id=idItems.nextNode(); item&&id; item = naItems.nextNode(),id=idItems.nextNode()){
var nastr = item.nodeTypedValue;
var idstr = id.nodeTypedValue;
var newOption = document.createElement("OPTION");
newOption.text =nastr;
newOption.value = idstr;
drp2.options.add(newOption);
}
}
</SCRIPT>
</HEAD>
<BODY ms_positioning="GridLayout" onload="load()">
<FORM id="Form1" method="post" runat="server">
<ASP:DROPDOWNLIST id="DropDownList1" runat="server"></ASP:DROPDOWNLIST>
<ASP:DROPDOWNLIST id="DropDownList2" runat="server"></ASP:DROPDOWNLIST>
<ASP:DROPDOWNLIST id="Dropdownlist3" runat="server"></ASP:DROPDOWNLIST>
</FORM>
</BODY>
</HTML>
-----------------------
namespace dropDown
{
/// <summary>
/// WebForm2 的摘要说明。
/// </summary>
public class WebForm2 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DropDownList DropDownList1;
protected System.Web.UI.WebControls.DropDownList Dropdownlist3;
protected System.Web.UI.WebControls.DropDownList DropDownList2;
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
if(!this.IsPostBack)
{
SqlConnection con = new SqlConnection("server=localhost;database=star;uid=sa;pwd=");
SqlDataAdapter da = new SqlDataAdapter("select maId,maName from tabMarket where maCls=0",con);
DataSet ds = new DataSet();
da.Fill(ds,"op");
this.DropDownList1.DataSource=ds.Tables[0];
this.DropDownList1.DataTextField = "maName";
this.DropDownList1.DataValueField = "maId";
this.DropDownList1.DataBind();
this.DropDownList1.Attributes.Add("onchange","load()");
this.DropDownList2.Attributes.Add("onchange","load2()");
}
}
}
}
-----------------------
public class WebForm1 : System.Web.UI.Page
{
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
// Put user code to initialize the page here
//if(this.Request["state"]!=null)
//{
string id =this.Request["id"];
SqlConnection con = new SqlConnection("server=localhost;database=star;uid=sa;pwd=;");
SqlDataAdapter da = new SqlDataAdapter("select maName,maId from tabMarket where maParent=@id and maSt=1 ",con);
da.SelectCommand.Parameters.Add("@id",id);
DataSet ds = new DataSet("Market");
da.Fill(ds);
ds.WriteXml(Response.OutputStream);
Response.Flush ();
Response.End ();
//}
}
}
-----------------------------
public class WebForm3 : System.Web.UI.Page
{
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
string id =Request["id"];
SqlConnection con = new SqlConnection("server=localhost;database=star;uid=sa;pwd=;");
SqlDataAdapter da = new SqlDataAdapter("select maName,maId from tabMarket where maParent=@id and maSt=1",con);
da.SelectCommand.Parameters.Add("@id",id);
DataSet ds = new DataSet("Market");
da.Fill(ds);
ds.WriteXml(Response.OutputStream);
Response.Flush ();
Response.End ();
}
}
------------------
Trackback: http://tb.blog.csdn.net/TrackBack.aspx?PostId=1377536
Trackback: http://tb.blog.csdn.net/TrackBack.aspx?PostId=1378525
