再談 N 個 ASP.net DropDownList 無重新整理聯動菜單,犧牲N-1個ASPX來實現自動更新機制,避免重新整理的閃動!!
以下代碼絕對可以使用,也可以實現多級菜單。。。。
<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"); //發送請求
var oDoc = new ActiveXObject("MSXML2.DOMDocument"); //響應結果
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)
{
// 在此處放置使用者代碼以初始化頁面
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)
{
// 在此處放置使用者代碼以初始化頁面
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();
}
}
---------------------------------
仔細看看``其實完全不用在響應多個DROPLIST的時候犧牲 N-1 個頁面,因為所有的響應都有一個共性,為什麼不可以多傳一個值進行判斷響應那一個方法呢???
var type ="type1";
oHttpReq.open("post","webform2.aspx?state="+state+"&type="+type, false);
string type = this.Request["type"].ToString();
switch(type)
{
case "type1":
.........................................
}
----------------------------------------------
程式需要做幾處修改:
1、解決drp2、drp3清楚不完全的問題: 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、如果傳多個值的問題也是一樣``
select t1,t2 from tt
只要多加一個條件就可以解決問題
=======================================================
這個還有很多可以研究的問題``比如重新整理後值的問題。。。。。。。。。。。。
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程式示範地址:http://www.718.com.cn/other/Example.aspx
在網上看到了一些無重新整理的聯動控制項。下下了測試以後,顯示英文和數字可以,但是不可以顯示中文,後來把從網上down下來的檔案做了一個翻修改,做了一個省市的聯動控制項。給大家共用一下。可以顯示中文了。
<%@ 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++)
//將小類的類名和編號賦予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源檔案:
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 的摘要說明。
/// </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)
{
// 在此處放置使用者代碼以初始化頁面
if(!this.IsPostBack)
{
// 建立資料來源載入第一個DropDownList,也可以預設載入第二個
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();
// 這裡是綁定用戶端事件,當第一個DropDownList的選項改變時激發下面的事件onchange,這個事件將調用一個用戶端方法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:該調用是 ASP.NET Web Form設計器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// 設計器支援所需的方法 - 不要使用代碼編輯器修改
/// 此方法的內容。
/// </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源檔案
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 的摘要說明。
/// </summary>
public class GetData : System.Web.UI.Page
{
private void Page_Load(object sender, System.EventArgs e)
{
// 在此處放置使用者代碼以初始化頁面
//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:該調用是 ASP.NET Web Form設計器所必需的。
//
InitializeComponent();
base.OnInit(e);
}
/// <summary>
/// 設計器支援所需的方法 - 不要使用代碼編輯器修改
/// 此方法的內容。
/// </summary>
private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
}
}
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ASP.net DropDownList 無重新整理聯動! <TITLE>WebForm2</TITLE>
<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 的摘要說明。
/// </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)
{
// 在此處放置使用者代碼以初始化頁面
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)
{
// 在此處放置使用者代碼以初始化頁面
// 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)
{
// 在此處放置使用者代碼以初始化頁面
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 ();
}
}
------------------
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