Possible to validate between INamingContainers in 2.0?

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daokfella - 07 Jun 2007 03:20 GMT

I have a composite control that contains a texbox and comparevalidator
(and other stuff not applicable to this post). Right now, it does a
simple DataTypeCheck or any comparison to the ValueToCompare property.
I've exposed the ValueToCompare and the CompareOperator properties.
The control is for a date, so the Type property is permanently set as
Date.

I'd like to expose the ControlToCompare property, but it won't work
because I'll always get the "Cannot find the control referenced by the
ControlToCompare property (paraphrased)". I'm assuming this is because
the two compared controls are in different INamingContainers.

Has anybody found a workaround? I'd like for my custom controls to be
able to be compared against each other. My short term workaround is
allowing for the internal compare operator to be disabled, and then
just using new comparevalidators on the page between the two controls.

Also, when setting the ValidationCompare attribute in my custom
control, this control id is shown in the dropdown for another's
ControlToCompare property. Unfortunately, this is the id of the top
level <span> container and not the textbox within the
compositecontrol. I thought that was the problem, but even after
exposing the textbox ClientId and using that as the ControlToCompare,
it still didn't work.

Thanks,

Jason

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Teemu Keiski - 13 Jun 2007 18:53 GMT

It should be if you assign UniqueID to the ControlToValidate property. As
validator uses FindControl to locate the control to be validated, it can
find it on other naming containers if the given id is unique id (exposing
the full containment hierarchy of the control)

Assuming I have a user control, WebUserConntrol1.ascx and it's code-behind

<%@ Control Language="vb" AutoEventWireup="false"
CodeBehind="WebUserControl1.ascx.vb"
Inherits="CSTestApplication1.WebUserControl1" %>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

Public Partial Class WebUserControl1
Inherits System.Web.UI.UserControl

Public ReadOnly Property TheBox() As TextBox
Get
Return TextBox1
End Get
End Property

End Class

And using it on aspx

<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="WebForm1.aspx.vb"
Inherits="CSTestApplication1.WebForm1" %>
<%@ Register Src="WebUserControl1.ascx" TagName="WebUserControl1"
TagPrefix="uc1" %>

<!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>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="Button1" runat="server" Text="Button" />
<asp:RequiredFieldValidator ID="RequiredFieldValidator1"
runat="server"
ErrorMessage="RequiredFieldValidator"></asp:RequiredFieldValidator>
<uc1:WebUserControl1 ID="UC1" runat="server" />
</div>
</form>
</body>
</html>

And relevant code to set the UNiqueID

Protected Sub Page_Load(ByVal sender As Object, ByVal e As
System.EventArgs) Handles Me.Load
Me.RequiredFieldValidator1.ControlToValidate =
Me.UC1.TheBox.UniqueID
End Sub

Signature

Teemu Keiski
AspInsider, ASP.NET MVP
http://blogs.aspadvice.com/joteke
http://teemukeiski.net

>I have a composite control that contains a texbox and comparevalidator
> (and other stuff not applicable to this post). Right now, it does a
[quoted text clipped - 24 lines]
>
> Jason

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Possible to validate between INamingContainers in 2.0?

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