simple control question

beeyule · #1 (**permalink**) 08-26-08, 13:25

I'm new to asp.net. I'm using the control below and everything works fine. What I'd like to do though is make the control invisible if the databinder.eval evaluates to null. Right now i

Can anyone assist me with this?

<asp:label id="alternateAccountNumberLabel" style="Z-INDEX: 123; LEFT: 472px; POSITION: absolute; TOP: 64px" runat="server"
Width="80px" Text='<%# DataBinder.Eval(account, "Tables[account].DefaultView.[0].alternate_account_number") %>'
ToolTip="Alternate Account Number"></asp:label>

gvee · #2 (**permalink**) 09-01-08, 05:39

Have a try with this

Code:

style="

<%
If DataBinder.Eval(account, "Tables[account].DefaultView.[0].alternate_account_number") Is DBNull.Value Then
    Response.Write("display:none;")
End If
%>

z-index: 123; ...

Teddy · #3 (**permalink**) 09-02-08, 12:26

I would do it in the code-behind to prevent the markup from being sent at all.

If this is in an enumerable control (gridview, etc) then you can override the RowDatabound event to evaluate the value of the current gridviewrow and set alternateAccountNumberLabel.visible = false.

That will prevent .NET from even sending the HTML. If you prefer, you could also assign a CssClass that would toggle display:none; if you want the object to be available to manipulate via js etc.

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