asp.net 父窗体获取子窗体的返回值，可用来对父窗体局部更新
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
