checkbox validation

bertus · January 23rd, 2011, 03:37 PM

I need help with the following:

I'm using a detailsview to edit data; one of the data-controls is a checkbox.
On submitting I want to make sure that the checkbox is checked. requierd field validator doesn't work and also a custom validator doesn't work:

Code:

Protected Sub CustomValidator1_ServerValidate(ByVal source As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs)
        Dim bool As CheckBox = DetailsView1.FindControl("BeterGemeld")

        If bool.Checked = True Then
            args.IsValid = True
        Else
            args.IsValid = False
        End If
    End Sub

WHY

????

Imar · January 23rd, 2011, 04:36 PM

Quote:

and also a custom validator doesn't work:

Why not? The code you have shoud work fine when editing an item in the DetailsView.

Are you sure ServerValidate is called? Did you hook up that method using something like this in your markup: OnServerValidate="CustomValidator1_ServerValidate" ?

Cheers,

Imar

bertus · January 23rd, 2011, 05:03 PM

Code:

<asp:CustomValidator ID="CustomValidator1" runat="server" 
                        CssClass="ErrorMessage" Display="Dynamic" ErrorMessage="CustomValidator" 
                        onservervalidate="CustomValidator1_ServerValidate" 
                        ValidationGroup="CheckBox"></asp:CustomValidator>

yep, here it is...

i get this error message:

Code:

Server Error in '/' Application.
--------------------------------------------------------------------------------

Object reference not set to an instance of an object. 
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.NullReferenceException: Object reference not set to an instance of an object.

Source Error: 


Line 17:         Dim bool As CheckBox = CType(DetailsView1.FindControl("BeterGemeld"), CheckBox)
Line 18: 
Line 19:         If bool.Checked = True Then
Line 20:             args.IsValid = True
Line 21:         Else

from which line 19 is red

Imar · January 23rd, 2011, 06:19 PM

And how does the code for the DetailsView look? Somehow, this code can't find it so it must be placed in a different location than this code expects.....

Imar

bertus · January 24th, 2011, 01:47 AM

Code:

<EditItemTemplate>
                    <asp:CheckBox ID="CheckBox1" runat="server" 
                        Checked='<%# Bind("BeterGemeld") %>' />
                    <asp:CustomValidator ID="CustomValidator1" runat="server" 
                        CssClass="ErrorMessage" Display="Dynamic" ErrorMessage="CustomValidator" 
                        onservervalidate="CustomValidator1_ServerValidate" 
                        ValidationGroup="CheckBox"></asp:CustomValidator>
                </EditItemTemplate>

I had to use "CheckBox1" in findControl....

And now it works fine...