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Zone: > NEWSGROUP > Asp.Net Forum > visual_studio.visual_studio_2005 Tags:
Item Type: NewsGroup Date Entered: 9/30/2005 11:39:56 AM Date Modified: Subscribers: 0 Subscribe Alert
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eltonho
Asp.Net User
Inline expression9/30/2005 11:39:56 AM

0/0

Hi all,

I am going to the visibility of a panel control based on a viewstate like this <asp:Panel id="Panel1" runat="server" visible='<%= ((String)ViewState["Mode"] == "New") %>' />

 

However, it does not work. Is the problem a syntax error or we cannot refer viewstate variable in inline expression?

 

Thanks,

Elton
alexgav
Asp.Net User
Re: Inline expression9/30/2005 5:35:16 PM

0/0

Hi Elton,

Unfortunately, you cannot have code exressions in attributes of ASP.NET server controls due to the way page is processed and executed.

Your best bet would be probably putting that code inside of Page_Load event handler. Something like

Panel1.Visible = ((String)ViewState["Mode"] == "New")

Thanks,
Alex

This posting is provided "AS IS" with no warranties, and confers no rights.
Luis Abreu
Asp.Net User
Re: Inline expression9/30/2005 7:04:59 PM

0/0

Hello Alex.

can you give me more info on that? I think that the following page is correct and works:

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

protected override void OnLoad( EventArgs args )

{

base.OnLoad( args);

//remove comment to show panel

//ViewState["howdy"] = "JJ";

mypanel.DataBind();

}

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >

<head runat="server">

<title>Untitled Page</title>

</head>

<body>

<form id="form1" runat="server">

<div>

<asp:Panel runat="server" ID="mypanel" Visible='<%# ViewState["howdy"] != null && (string)(ViewState["howdy"]) == "JJ"%>'>

howdy from panel!

</asp:Panel>

</div>

</form>

</body>

</html>

--
Regards,
Luis Abreu
email: labreu_at_gmail.com
PT blog: http://weblogs.pontonetpt.com/luisabreu
EN blog:http://msmvps.com/blogs/luisabreu
http://www.pontonetpt.com
http://weblogs.pontonetpt.com/
alexgav
Asp.Net User
Re: Inline expression9/30/2005 8:39:07 PM

0/0

Hi Luis,

I was talking about code expressions vs. databinding expressions. I.e., <%= vs. <%#.

While your sample works, I find that it would be simpler to set Panel1.Visible in Page_Load, rather than having code in two places. That will also keep your markup cleaner. Since we have nice object model for server controls, I try to use that when I can, and let the control generate HTML for me.

Hope that makes sense :-)

Thanks,
Alex
This posting is provided "AS IS" with no warranties, and confers no rights.
Luis Abreu
Asp.Net User
Re: Inline expression9/30/2005 9:39:06 PM

0/0

Hello Alex.

i'm just glad that at least one of us is able to see correctly :P (unfortunatelly, it seems like i'm the one that needs to go to the doctor).

yes, you're absolutly right. as you can guess, i read  <%# instead of <%= and yes your approach is the one i'd use if i needed to...
--
Regards,
Luis Abreu
email: labreu_at_gmail.com
PT blog: http://weblogs.pontonetpt.com/luisabreu
EN blog:http://msmvps.com/blogs/luisabreu
http://www.pontonetpt.com
http://weblogs.pontonetpt.com/
5 Items, 1 Pages 1 |< << Go >> >|


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