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.NET中实现无刷新客户端联动下拉菜单 (无刷新)(一)

2009-01-16 13:35 525 查看

<%@ Page language="c#" Codebehind="WebForm1.aspx.cs" AutoEventWireup="false" Inherits="CustomManager.company.WebForm1" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>WebForm1</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">
<LINK href="../css/style.css" type="text/css" rel="stylesheet">
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<asp:dropdownlist id="DropDownList1" style="Z-INDEX: 101; LEFT: 40px; POSITION: absolute; TOP: 168px"
runat="server"></asp:dropdownlist>


<asp:label id="Label1" style="display:none;" runat="server">Label</asp:label>

<asp:DropDownList id="DropDownList2" style="Z-INDEX: 104; LEFT: 40px; POSITION: absolute; TOP: 264px"
runat="server"></asp:DropDownList></form>
<script LANGUAGE="javascript">
//将隐藏的字符串取出来，然后分割到一个数组中去
var str = document.getElementById("Label1").innerText;
arr=str.split(",");
a=arr.length
ar=new Array()
for (i=0;i<a;i++){
ar[i]=arr[i].split("-");
}
onecount=ar.length;

//此处实现联动
function ld() {
document.Form1.DropDownList2.length=0
lid=Form1.DropDownList1.value;
for (i=0;i<onecount;i++) {
if (ar[i][0] == lid) {
document.Form1.DropDownList2.options.add(new Option(ar[i][2], ar[i][1]));
}
}
}

function showMsg()
{
alert(document.Form1.DropDownList1.value);
alert(document.Form1.DropDownList2.value);
}

</script>
</body>
</HTML>

以下是WebForm1.aspx.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 CustomManager.company
{
/// <summary>
/// WebForm1 的摘要说明。
/// </summary>
public class WebForm1 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DropDownList DropDownList1;
protected System.Web.UI.WebControls.Label Label1;
protected System.Web.UI.WebControls.DropDownList DropDownList2;
static protected DataTable tb1;

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(!Page.IsPostBack)
{

}

//给DropDownList1设置onchange事件
DropDownList1.Attributes.Add("onchange","ld();");
string strConn,strSql;
System.Data.SqlClient.SqlDataAdapter da;

//从数据库中取出一级栏目，绑定到 DropDownList1
strConn = "server=localhost;database=custom;uid=custom;pwd=a;";
strSql = "select * from custom.bigcalling;";
da = new System.Data.SqlClient.SqlDataAdapter(strSql,strConn);
DataTable tb3 = new DataTable();
da.Fill(tb3);

DropDownList1.DataSource = tb3;
DropDownList1.DataTextField = "BIGCALLNAME";
DropDownList1.DataValueField= "BIGCALLID";
DropDownList1.DataBind();

//取出二级栏目数据，存放到一个DataTable()中
strSql = "select * from custom.smallcalling;";
da = new System.Data.SqlClient.SqlDataAdapter(strSql,strConn);
tb1 = new DataTable();
da.Fill(tb1);

//以下就是将一级和二级菜单的内容，分别以"-"和","隔开
//然后存放到 Label1中,这样客户端就可以通过脚本取得所需要的数据了
Label1.Text = "";

foreach(DataRow row in tb1.Rows)
{
Label1.Text = Label1.Text + row["BIGCALLID"] + "-" +row["SMALLCALLID"] + "-"+row["SMALLCALLNAME"] + ",";

}

}

#region Web 窗体设计器生成的代码
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

}
}

实例二:javascrip实现

<script language="javascript">

</script>

<body MS_POSITIONING="GridLayout" onload="init();">
<form id="Form1" method="post" runat="server">
<asp:dropdownlist id="province" Runat="server"></asp:dropdownlist><asp:dropdownlist id="city" Runat="server"></asp:dropdownlist></SELECT><asp:button id="Button1" style="Z-INDEX: 101; LEFT: 240px; POSITION: absolute; TOP: 48px" runat="server"
Text="Button"></asp:button><asp:label id="Label1" style="Z-INDEX: 102; LEFT: 280px; POSITION: absolute; TOP: 136px" runat="server">Label</asp:label><input id="HiddenValue" type="hidden" name="HiddenValue" runat="server">
<input id="HiddenValueshi" type="hidden" name="HiddenValueshi" runat="server">
</form>
</body>
Private Sub Page_Load()Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'If Not Page.IsStartupScriptRegistered("init") Then
' Page.RegisterStartupScript("init", "<script>init();</script>")
'End If

If Not IsPostBack Then

province.Attributes.Add("onchange", "select()")
city.Attributes.Add("onchange", "select1()")

End If

End Sub

Private Sub Button1_Click()Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Response.Write(HiddenValue.Value)
Response.Write(HiddenValueshi.Value)

End Sub

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