在一些.net论坛中有人经常会问：如何在页面中点击按钮打开新页面，输入数据，然后返回到初始页面并进行更新？要解决这个问题，应该弄清楚window.showModalDialog()的用法，本人在http://www.csdn.net/Develop/read_article.asp?id=15113已经做过介绍。下面就用例子介绍如何在ASP.NET中实现这个功能。
本例子共3个页面，其中WebForm2.aspx是过渡页面，是为了防止提交时打开新页面。
WebForm1.aspx
<%@ Page Language="<a href="http://dev.21tx.com/language/vb/" target="_blank">VB</a>" AutoEventWireup="false" Codebehind="WebForm1.aspx.vb"
Inherits="ShowModalDialog.WebForm1" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<title>WebForm1</title>
<meta content="Microsoft Visual Studio .NET 7.0" name="GENERATOR">
<meta content="Visual Basic 7.0" name="CODE_LANGUAGE">
<meta content="<a href="http://dev.21tx.com/web/javascript/" target="_blank">JavaScript</a>" name="vs_defaultClientScript">
<meta content="http://schemas.microsoft.com/intellisense/ie5" name="vs_targetSchema">
</HEAD>
<body MS_POSITIONING="GridLayout">
<div align="center">
<form id="Form1" method="post" runat="server">
<asp:label id="Label1" runat="server" Font-Bold="true">
从当前页面打开新窗口，并把变量传递到新窗口的例子，可以多次打开提交。
</asp:label><br>
<br>
<asp:textbox id="TextBox1" runat="server" Width="600px">这是初始值，将被传递到新窗口。</asp:textbox><br>
<br>
<asp:button id="Button1" runat="server" Text="打开窗口" Width="96px"></asp:button></form>
</div>
</body>
</HTML>
WebForm1.aspx.vb
Public Class WebForm1
Inherits System.Web.UI.Page
Protected WithEvents TextBox1 As System.Web.UI.WebControls.TextBox
Protected WithEvents Form1 As System.Web.UI.HtmlControls.HtmlForm
Protected WithEvents Label1 As System.Web.UI.WebControls.Label
Protected WithEvents Button1 As System.Web.UI.WebControls.Button
#Region " Web 窗体设计器生成的代码 "
'该调用是 Web 窗体设计器所必需的。
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
End Sub
Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
'CODEGEN: 此方法调用是 Web 窗体设计器所必需的
'不要使用代码编辑器修改它。
InitializeComponent()
End Sub
#End Region
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'在此处放置初始化页的用户代码
If (Not IsClientScriptBlockRegistered("clientScript")) Then
Dim strScript As String = "<script>" + vbCrLf
strScript += "function OpenWin(){" + vbCrLf
strScript += "var str=window.showModalDialog('WebForm2.aspx',document.Form1.TextBox1.value)" + vbCrLf
strScript += "if(str!=null) document.Form1.TextBox1.value=str" + vbCrLf
strScript += "}" + vbCrLf
strScript += "</script>" + vbCrLf
RegisterClientScriptBlock("clientScript", strScript)
End If
Button1.Attributes.Add("onclick", "OpenWin()")
End Sub
End Class
WebForm2.aspx
<%@ Page Language="vb" AutoEventWireup="false" Codebehind="WebForm2.aspx.vb" Inherits="aspxWeb.mengxianhui.com.WebForm2"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<title>WebForm2</title>
<meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.0">
<meta name="CODE_LANGUAGE" content="Visual Basic 7.0">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<frameset rows="0,*">
<frame src="about:blank">
<frame src="WebForm3.aspx">
</frameset>
</HTML>
WebForm2.aspx.vb
Public Class WebForm2
Inherits System.Web.UI.Page
#Region " Web 窗体设计器生成的代码 "
'该调用是 Web 窗体设计器所必需的。
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
End Sub
Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Init
'CODEGEN: 此方法调用是 Web 窗体设计器所必需的
'不要使用代码编辑器修改它。
InitializeComponent()
End Sub
#End Region
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
'在此处放置初始化页的用户代码
End Sub
End Class
WebForm3.aspx
<%@ Page Language="vb" AutoEventWireup="false" Codebehind="WebForm3.aspx.vb"
Inherits="ShowModalDialog.WebForm3" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<title>WebForm3</title>
<meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.0">
<meta name="CODE_LANGUAGE" content="Visual Basic 7.0">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout" id="MyBody" runat="server">
<form id="Form1" method="post" runat="server">
<asp:Label id="Label1" runat="server">请输入您的大名：</asp:Label><br>
<br>
<asp:TextBox id="TextBox1" runat="server" Width="558"></asp:TextBox><br>
<br>
<asp:Button id="Button1" runat="server" Text=" 提 交 "></asp:Button>
</form>
</body>
</HTML>
WebForm3.aspx.vb
Public Class WebForm3
Inherits System.Web.UI.Page
Protected WithEvents TextBox1 As System.Web.UI.WebControls.TextBox
Protected WithEvents Label1 As System.Web.UI.WebControls.Label
Protected WithEvents Button1 As System.Web.UI.WebControls.Button
Protected MyBody As System.Web.UI.HtmlControls.HtmlControl
#Region " Web 窗体设计器生成的代码 "
'该调用是 Web 窗体设计器所必需的。
<System.Diagnostics.DebuggerStepThrough()> Private S
