求一段js代码，2个listbox的有关问题

2012-04-01

求一段js代码，2个listbox的问题需求是这样的，我现在有两个listbox，1和2，我想点一下1中的任何一个item，然后

求一段js代码，2个listbox的问题
需求是这样的，我现在有两个listbox，1和2 ，我想点一下1中的任何一个item，然后去数据库中去搜col列符合选中的那个值的所有符合条件记

录的某一列（col_ok）列，显示在2中。如果我要点1中的其他值，2中相应的跟着变化。(数据库配合方面可以简单的说一下就ok了，这个我到会)

最好能把关键的步骤都列一下，谢谢了，

[解决办法]
用ajax
[解决办法]
如果不用　ajax 的话
就用　change服务器事件吧
[解决办法]
要求无刷？要是不要求
直接ListBox 属性AutoPostBack= "True "
在后台事件里写就行了
protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
{
根据ListBox1值绑定listbox2
}
[解决办法]
www.asp.net去下
[解决办法]
http://ajax.asp.net/default.aspx?tabid=47
[解决办法]
不是

[解决办法]
理解错了!
那个不行!刷新!

你自己查查 XMLHTTP资料
自己写不用什么框架
[解决办法]
到底要不要刷新？刷的话
直接ListBox 属性AutoPostBack= "True "
在后台事件里写就行了
protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
{
根据ListBox1值绑定listbox2
}
如果要无刷的话用ajax技术把根新数据取到客户端用JS根新listbox2
[解决办法]
楼上总结的很好
[解决办法]
同上上
[解决办法]
同 chy3503319(东北车神)
[解决办法]
参考一下这个

--aspx
<%@ Page language= "c# " Codebehind= "WebForm1.aspx.cs " AutoEventWireup= "false " Inherits= "AjaxTest.WebForm1 " %>
<HTML>
<HEAD>
<title> Ajax实现无刷新三联动下拉框 </title>
<meta content= "Microsoft Visual Studio .NET 7.1 " name= "GENERATOR ">
<meta content= "C# " name= "CODE_LANGUAGE ">
<meta content= "JavaScript " name= "vs_defaultClientScript ">
<meta content= "http://schemas.microsoft.com/intellisense/ie5 " name= "vs_targetSchema ">
<SCRIPT language= "javascript ">
//城市------------------------------
function cityResult()
{
var city=document.getElementById( "DropDownList1 ");
AjaxMethod.GetCityList(city.value,get_city_Result_CallBack);
}

function get_city_Result_CallBack(response)
{
if (response.value != null)
{
//debugger;
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].city;
　　　　　　var id=ds.Tables[0].Rows[i].cityID;
　　　　　　document.all( "DropDownList2 ").options.add(new Option(name,id));
　　　　}
}
}
return
}
//市区----------------------------------------
function areaResult()
{

using System.Data;
using System.Data.SqlClient;
namespace AjaxTest
{
/// <summary>
/// Summary description for AjaxMethod.
/// </summary>
public class AjaxMethod
{

#region GetProvinceList
public static DataSet GetProvinceList()
{
string sql= "select * from province ";
return GetDataSet(sql);
}
#endregion

#region GetCityList
[Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.Read)]
public DataSet GetCityList(int provinceid)
{
string sql= "select * from city where father= "+provinceid;
return GetDataSet(sql);
}
#endregion

#region GetAreaList
[Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.Read)]
public DataSet GetAreaList(int cityid)
{
string sql= "select * from area where father= "+cityid;
return GetDataSet(sql);
}
#endregion

#region GetDataSet
public static DataSet GetDataSet(string sql)
{
string ConnectionString=System.Configuration.ConfigurationSettings.AppSettings[ "ConnectionString "];
SqlDataAdaptersda =new SqlDataAdapter(sql,ConnectionString);
DataSet ds=new DataSet();
sda.Fill(ds);
return ds;
}
#endregion

}
}

[解决办法]
--后台cs
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;
namespace AjaxTest
{
/// <summary>
/// Summary description for WebForm1.
/// </summary>
public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DropDownList DropDownList1;
protected System.Web.UI.WebControls.DropDownList DropDownList2;
protected System.Web.UI.WebControls.TextBox TextBox1;
protected System.Web.UI.WebControls.DropDownList DropDownList3;

private void Page_Load(object sender, System.EventArgs e)
{
Ajax.Utility.RegisterTypeForAjax(typeof(AjaxMethod));
if(!Page.IsPostBack)
{
this.DropDownList1.DataSource=AjaxMethod.GetProvinceList();
this.DropDownList1.DataTextField= "province ";
this.DropDownList1.DataValueField= "provinceID ";
this.DropDownList1.DataBind();

this.DropDownList1.Attributes.Add( "onclick ", "cityResult(); ");
this.DropDownList2.Attributes.Add( "onclick ", "areaResult(); ");
}
}

#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: This call is required by the ASP.NET Web Form Designer.
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion
}
}

[解决办法]
路过
[解决办法]
需引用Ajax.dll

web.config需加上
<httpHandlers>

<add verb= "POST,GET " path= "ajax/*.ashx " type= "Ajax.PageHandlerFactory, Ajax " />
</httpHandlers>
[解决办法]
研究下```

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