customvalidator problem

[wsyeager]

I'm using the customvalidator in my web page. I get the following error when I try to run the web page:

 

Unable to find control id 'lstRider' referenced by the 'ControlToValidate' property of 'cvRiders'.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

 

Exception Details: System.Web.HttpException: Unable to find control id 'lstRider' referenced by the 'ControlToValidate' property of 'cvRiders'

 

 

Here is part of my HTML that is of concern:

<asp:TemplateColumn HeaderText="Riders">

<ItemTemplate>

<asp:listbox AutoPostBack="False" BackColor="#ffffff" id="lstRider" runat="server" Rows="1" DataSource="<%# DsRider1 %>" Enabled="True" SelectionMode="Multiple" DataTextField="UserName" DataValueField="UserID" />

</asp:listbox>

</ItemTemplate>

</asp:TemplateColumn>

</asp:datagrid><asp:customvalidator id="cvRiders" style="Z-INDEX: 104; LEFT: 136px; POSITION: absolute; TOP: 88px" runat="server"

display="Static" OnServerValidate="lstRiderValidation" ErrorMessage="Riders has a maximum selection of 2" ControlToValidate="lstRider"></asp:customvalidator>

 

 

This is what I have in my code-behind:

 

Sub lstRiderValidation(ByVal source As Object, ByVal arguments As ServerValidateEventArgs) Handles cvRiders.ServerValidate

 

Dim strSelectionArray() As String = arguments.Value.Split(",")

 

If strSelectionArray(2).Length > 0 Then 'Max 2 selections

arguments.IsValid = False

Else

arguments.IsValid = True

End If

 

End Sub

 

How can I get the customvalidator to recognize my control? I know it's probably because the control is an itemtemplate...

[Robby]

You need to create a client side script to handle this ( cvRiders)

[wsyeager]

I just included the validator control inside my itemtemplate....

[Robby]

Did you create a client-side function to be used by the custom validator?

[wsyeager]

Robby, no I didn't. I didn't get a chance yet to test out the validation, but I am able to display the web page now without a problem.

 

Is there some link or small sample that you could point me to where I can take care of this?

 

Shouldn't the code in my lstRiderValidation event handle this validation?

[Robby]

Here's a small sample I put together.

 

If you enter anything but 100 into the textbox it will not pass validation.

 

Take notice of the client-side script in the head section, and the parameters of the validator.

customvalidator_sample.zip