今天在项目上遇到了这个问题，其实只是window.returnValue的简单应用，不是asp.net的专属内容。作为积累，记录一个简单的实现模型。
图1 用到的文件
从图1中我们可以看到，只用到了两个页面，其中Default.aspx作为父页面，Default2.aspx作为子页面被弹出。Default.aspx页面上有两个TextBox一个Button，代码如下：
1 <% @ Page Language = " C# " AutoEventWireup = " true " CodeFile = " Default.aspx.cs " Inherits = " _Default " %> 2 3 <! DOCTYPE html PUBLIC " -//W3C//DTD XHTML 1.0 Transitional//EN " " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd " > 4 5 < html xmlns = " http://www.w3.org/1999/xhtml " > 6 < head runat = " server " > 7 < title ></ title > 8 9 </ head > 10 < body > 11 < form id = " form1 " runat = " server " > 12 < div > 13 < asp:TextBox runat = " server " ID = " a1 " > 14 </ asp:TextBox > 15 < asp:TextBox ID = " TextBox1 " runat = " server " ontextchanged = " TextBox1_TextChanged " ></ asp:TextBox > 16 < asp:Button ID = " Button1 " runat = " server " Text = " Button " onclick = " Button1_Click " /> 17 18 19 </ div > 20 21 </ form > 22 </ body > 23 </ html > 24
在Button1的Click事件中，我们注册弹窗脚本，代码如下：
1 protected void Button1_Click( object sender, EventArgs e) 2 { 3 StringBuilder s = new StringBuilder(); 4 s.Append( " <script language=javascript> " ); 5 s.Append( " var a=window.showModalDialog('Default2.aspx'); " ); 6 s.Append( " if(a!=null) " ); 7 s.Append( " document.all('TextBox1').value=a; " ); 8 s.Append( " </script> " ); 9 Type cstype = this .GetType(); 10 ClientScriptManager cs = Page.ClientScript; 11 string sname = " lt " ; 12 if ( ! cs.IsStartupScriptRegistered(cstype, sname)) 13 cs.RegisterStartupScript(cstype, sname, s.ToString()); 14 }
其中 s.Append("var a=window.showModalDialog('Default2.aspx');");一句用来弹窗Default2.aspx页面并接收它的返回值。
接收了返回值之后我们把它赋值给TextBox1.
Default2.aspx页面有一个TextBox和一个Button，代码如下：
(这里需要注意的是在head里的<base target="_self" />标记十分重要。
1 <% @ Page Language = " C# " AutoEventWireup = " true " CodeFile = " Default2.aspx.cs " Inherits = " Default2 " %> 2 3 <! DOCTYPE html PUBLIC " -//W3C//DTD XHTML 1.0 Transitional//EN " " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd " > 4 5 < html xmlns = " http://www.w3.org/1999/xhtml " > 6 < head > 7 < title ></ title > 8 < base target = " _self " /> 9 </ head > 10 11 < body > 12 < form id = " form1 " runat = " server " > 13 < div > 14 < asp:textbox runat = " server " ID = " t1 " ></ asp:textbox > 15 < asp:Button ID = " Button1 " runat = " server " Text = " Button " onclick = " Button1_Click " /> 16 17 </ div > 18 </ form > 19 </ body > 20 </ html > 21
我们在Default2.aspx页面的Button_Click事件中使用脚本返回一个值给父页面。代码如下：
1 protected void Button1_Click( object sender, EventArgs e) 2 { 3 StringBuilder s = new StringBuilder(); 4 s.Append( " <script language=javascript> " + " \n " ); 5 s.Append( " window.returnValue=' " + this .GetSelectValue() + " '; " + " \n " ); 6 s.Append( " window.close(); " + " \n " ); 7 s.Append( " </script> " ); 8 Type cstype = this .GetType(); 9 ClientScriptManager cs = Page.ClientScript; 10 string csname = " ltype " ; 11 if ( ! cs.IsStartupScriptRegistered(cstype, csname)) 12 cs.RegisterStartupScript(cstype, csname, s.ToString()); 13 14 }
脚本注册成功之后，我们可以做如下的实验：
1）打开Default1.aspx页面在id为a1的TextBox中输入数字55，然后点击Button
2）在弹窗中输入数字66再点子窗体的按钮关闭子窗体。
3）查看结果
从结果中，我们可以看出我们保留了先输入到父窗体中的值，又接收了从子窗体传递过来的值。
本文转自悬魂博客园博客，原文链接：http://www.cnblogs.com/xuanhun/archive/2010/03/08/1681089.html，如需转载请自行联系原作者