How to know in the code behind if the window has been open from another window
Hi
I want to know in the code behind (server side) if the page has been open from another window. In the client side I can check, in a javascript function, if the window.opener is null or not, but how can I know this in the code behind. Is it possible?
Thanks,
Luis Miguel
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lmmolinero
10/12/2007 8:21:29 PM
asp.net.web-forms
93655 articles. 
6 followers.
5 Replies
2321 Views
I think your best bet might be to use a HiddenField, and populate that HiddenField with the javascript window.opener value.
For example:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<script type="text/javascript">
function testWindow()
{
hiddenField = document.getElementById("hiddenField");
hiddenField.value = window.opener;
}
</script>
<body>
<form id="form1" runat="server" onsubmit="testWindow();">
<div>
<input type="submit" value="Submit" />
<br />
<a href="Default.aspx" target="_blank">Open New Window</a>
<asp:hiddenfield id="hiddenField" runat="server" />
</div>
</form>
</body>
</html>
and in the codebehind:
protected void Page_Load(object sender, EventArgs e)
{
Response.Write(string.Format("HiddenField value: {0}<br />", hiddenField.Value));
}You can play with that, and see how it goes!
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jason
10/12/2007 9:15:10 PM
Thanks for quick answer.
But this isn’t the solution for the question I posted, because as I said of course I know how to refer to de oponer window in the client side, using window.opener, but the problem is that I want to know it before the page renders, in the server side, if the page has been opened by another window, in order to change some properties of different controls. So I need to know if it is client window before any javascript executes.
Anyway thanks for your quick answer.
Luis Miguel
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lmmolinero
10/13/2007 7:51:08 AM
What about using something like:
Request.UrlReferrer
If you look at that when you open a window from scratch, it's null....and if it's a link from another aspx page, it has the URL?
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jason
10/15/2007 9:28:44 PM
Thanks Jason. You are right, that is the path to the right solution. I use a navigation menu in the main window, so the Request.UrlReferrer is never null, but the answer is in the Request.UrlReferrer.AbsolutePath value, because there I have the information about the opener. Problem solved!
Best regards
Luis Miguel
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lmmolinero
10/16/2007 10:27:01 AM
Glad I could help!
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jason
10/16/2007 7:09:30 PM
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