Newbie mistake or Custom Validator bug?

Guest · Feb 22, 2006

I have a very strange problem involving controls and the CustomValidator.

We have created a custom control. The control includes an ordinary textbox,
a customvalidator with the ControlToValidate set to the textbox, and a
VBScript validator subroutine. The purpose of the sub is to insure that only
dates that fall on Monday are permitted. The custom validator is exposed
through a property to permit enabling and disabling as needed.

The problem is this. If I have two instances of the control on a page, the
custom validator of the first instance is apparently calling the sub of the
second. The net effect is that I cannot properly validate Mondays on the
first control. This control seems to work fine when there is only one
instance on a page. When I examine the HTML source, it appears that there
are the correct instances of the code, each accessing the correct controls.

(I should admit upfront that the control also contains a ThirdParty calendar
date selector, Telerik, but as far as I can tell, none of the problem code
interacts with it in any way. It's sole purpose is to put a property
formatted date string into the textbox.)

Peter Blum · Feb 23, 2006

Please post:
1. The ASP.NET definitions of the controls involved.
2. The server side code involved.
3. The client-side code involved.

--- Peter Blum
www.PeterBlum.com
Email: (e-mail address removed)
Creator of "Professional Validation And More" at
http://www.peterblum.com/vam/home.aspx

Guest · Feb 23, 2006

I have just created a test case (without any 3rd party controls,
incidentally. That appears to have nothing to do with the problem)

First create a user control with a textbox and a custom validator:
----- ASPX starts here ---------------
<%@ Control Language="vb" AutoEventWireup="false"
Codebehind="CalendarTest.ascx.vb" Inherits="test1.CalendarTest"
TargetSchema="http://schemas.microsoft.com/intellisense/ie5" %>
<asp:TextBox id="txtDate" runat="server" Columns="18"
CssClass="text"></asp:TextBox>
<asp:CustomValidator id="MondayValidator1" runat="server"
ClientValidationFunction="ValidateMondayVB"
ErrorMessage="The Date is not a Monday" Enabled="False"
ControlToValidate="txtDate">*</asp:CustomValidator>
<script language="vbscript">

Sub ValidateMondayVB(source, args)

If IsDate(document.forms("Form1").item("<%= Me.txtDate.ClientID
%>").Value) then

startDt = CDate(document.forms("Form1").item("<%= Me.txtDate.ClientID
%>").Value)
msgbox "Here I am control <%= Me.ClientID %>, box = <%=
Me.txtDate.ClientID %> , source.id = " & source.id
If WeekDay(startDt) <> vbMonday then
msgbox "Start date must be a Monday. You specified a " &
WeekdayName(WeekDay(startDt)) & "."
args.IsValid = false
Else
args.IsValid = true
End if

End if

End Sub
</script>

------- ASPX ends here ------------
Next add the following property to the control code behind:
Public Property MondayValidator() As CustomValidator
Get
Return MondayValidator1
End Get
Set(ByVal Value As CustomValidator)
MondayValidator1 = Value
End Set
End Property
--------
Now create a test page using the control:

------- test page ASPX starts here ---------------------------------

<%@ Page Language="vb" AutoEventWireup="false"
Codebehind="WebForm12.aspx.vb" Inherits="test1.WebForm12"%>
<%@ Register TagPrefix="uc1" TagName="CalendarTest" Src="CalendarTest.ascx" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<title>WebForm12</title>
<meta name="GENERATOR" content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" content="Visual Basic .NET 7.1">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema"
content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
<asp:ValidationSummary id="ValidationSummary1" runat="server"
BorderStyle="Outset" Width="272px"></asp:ValidationSummary>
<P>
<uc1:CalendarTest id="CalendarTest1"
runat="server"></uc1:CalendarTest>
<uc1:CalendarTest id="CalendarTest2"
runat="server"></uc1:CalendarTest></P>
<P> </P>
<P>
<asp:Button id="Button1" runat="server" Text="Validate"></asp:Button></P>
</form>
</body>
</HTML>
-------- test page ASPX ends here ---------------------

Finally add the following to the test page's Page_Load

CalendarTest1.MondayValidator.Enabled = True
CalendarTest1.MondayValidator.ErrorMessage = "Test1 Fired"
CalendarTest2.MondayValidator.Enabled = False
CalendarTest2.MondayValidator.ErrorMessage = "Test2 Fired"

Now run the project. Enter a Monday date (2/20/2006 for example) in the
first box. Enter a non-Monday date in the second. (In my actual work, these
boxes would have Javascript formatting routines forcing a mm/dd/yyyy format
so only use that.) Now press the button. The first validator fires after
apparently using the 2nd instances VBscript sub, or so it looks to me.

Thanks

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Newbie mistake or Custom Validator bug?

Guest

Peter Blum

Guest

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