Hi;

I have a case where I need to require a TextBox be filled in only if a
certain radio button is checked. I can't use RequiredFieldValidator because
if the button is not checked, then it can be empty. But a
CustomValidator.OnServerValidate is not called if a TextBox is empty.

How should I handle this?

hi David, theres a new property for asp.net 2.0 supported by the
customvalidator control, which you can set to have it validate an empty
textbox control. The property you want to enable is :
ValidateEmptyText="true"

http://msdn2.microsoft.com/en-us/library/system.web.ui.webcontrols.customvalidator.validateemptytext.aspx

Regards,
Alessandro Zifiglio
http://www.AsyncUI.net

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Thanks for Alessandro's input.

Hi Dave,

Does the "ValidateEmptyText" property the one you need?  Please feel free
to post here if you have any further questions.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


This posting is provided "AS IS" with no warranties, and confers no rights.

that was it - thank you


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You could also enable/disable the RequieredValidator by using a short
clientSide snippet. Something like radioButton.Attributes["onchange"] =
string.Format("ValidatorEnable(document.getElementById('{0}'),_
document.getElementById('{1}').checked);",requiredValidator.ClientID,radioButton.ClientID);

Regards,
Tasos




David Thielen wrote:
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Hi David, Steven and Alessandro and Tasos,

I have a similar question and please be patient as I am very new to .net...

I want to require a textbox field to have an entry only when a certain
selection is made from a dropdown list.  For example:  The form is asking for
agency name and I have a pre-populated list of agency names with the last
option being "Other" - if the user selects "other" then I want the Other
Agency: textbox field to be required.
I have started a customvalidator control but I just can't get it to work
yet. 

Here is what I have:
<asp:CustomValidator id="agencynamevalidator" Runat="server"
ControlToValidate="otheragency" OnServerValidate="ServerValidate"
validateemptytext="true" display="Static" ErrorMessage="You chose other
because your agency does not appear on this list, please enter the name of
your agency."> *</asp:customvalidator>

'if value of agency field is equal to Other then make the otheragency field
required

       Private Sub agencynamevalidator_ServerValidate(ByVal source As
System.Object, ByVal args As
System.WEb.UI.WebControls.ServerValidateEventArgs) Handles
agencynamevalidator.ServerValidate
         Try
           If request.form(agency.value) is "Other" And
request.form(otheragency.text) is not "" then
            args.IsValid = true
           ElseIf request.form(agency.value) is "Other" And
request.form(otheragency.text) is "" then
            args.IsValid = (otheragency.text.trim() <> "")
           Else
         args.IsValid = false
        End If 
       Catch ex As Exception
       'whatever
        End Try
       End Sub



Right now - I get the following error message:
Compiler Error Message: BC30506: Handles clause requires a WithEvents
variable.







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