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server side validation check if field is empty

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This is a migrated thread and some comments may be shown as answers.

Susanna Wiedemann asked on 28 Jul 2009, 02:54 PM

Dear all

I added the validation (on server-side) for some fields of my grid. It's working fine.

But, I'd like to add, that if the field is blank/empty the validation fails as well. I found out, that when my code is running and the field is blank it's not running through the validation. Plelase find here the code of the asp and the vb I used:

    
                      <telerik:GridTemplateColumn HeaderText="Zip Code" UniqueName="TemplateColumn">  
        
                      <EditItemTemplate> 
        
                      <asp:TextBox id="TextBox1" runat="server" Text='<%# Bind("zipcode") %>' MaxLength="4"></asp:TextBox> 
        
                        <asp:CustomValidator id="CustomValidator1" runat="server"   
        
                        ErrorMessage="please enter a zip code" 
        
                        ControlToValidate="TextBox1" 
        
                        OnServerValidate= "CustomValidator1_ServerValidate">  
        
                        </asp:CustomValidator> 
        
                        </EditItemTemplate> 
        
                        <ItemTemplate> 
        
                         <asp:Label ID="label1" runat="server" Text='<%# Eval("zipcode") %>'></asp:Label> 
        
                        </ItemTemplate> 
        
                      </telerik:GridTemplateColumn>

    
                Protected Sub CustomValidator1_ServerValidate(ByVal [source] As Object, ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs)  
        
                    Dim i As Integer 
        
                    Try 
        
                        i = Convert.ToInt16(args.Value)  
        
                    Catch ex As Exception  
        
                        args.IsValid = False 
        
                    End Try 
        
                    If args.Value.Length <> 4 Then 
        
                        args.IsValid = False 
        
                    End If 
        
                End Sub 'CustomValidator1_ServerValidate

As already said, it's working fine, it's just not running the CustomValidator1_ServerValidate code if the field zipcode is left blank by the user.

Does anybody has some ideas, solutions or is there anything I did wrong?

Thanks in advance for your help

Cheers

Marino

5 Answers, 1 is accepted

Accepted

answered on 16 Sep 2009, 11:08 AM

Dear all

After I added filter options the validation wasn't working at all with the removed "ControlToValidate".

I found a parameter that helped me to solve my problem. ValidateEmptyText needs to be set on true:

    
                      <telerik:GridTemplateColumn HeaderText="Zip Code" UniqueName="TemplateZip" 
        
                      AutoPostBackOnFilter="true" CurrentFilterFunction="EqualTo" 
        
                        ShowFilterIcon="false" DataField="Zipcode"  > 
        
                       <ItemTemplate> 
        
                        <asp:Label ID="label1" runat="server" Text='<%# Eval("zipcode") %>'></asp:Label> 
        
                       </ItemTemplate> 
        
                       <EditItemTemplate> 
        
                        <asp:TextBox id="TextBox1" runat="server" Text='<%# Bind("zipcode") %>'  MaxLength="4"   
        
                          CausesValidation="true" ></asp:TextBox> 
        
                         <asp:CustomValidator id="CustomValidator1" runat="server" 
        
                          ErrorMessage="please enter a swiss zip code" 
        
                          ControlToValidate="TextBox1" 
        
                          ValidateEmptyText="true" 
        
                          OnServerValidate= "CustomValidator1_ServerValidate">  
        
                         </asp:CustomValidator> 
        
                        </EditItemTemplate> 
        
                      </telerik:GridTemplateColumn>

When I added this I could use the ControlToValidate again and it is validating the field correctly now, even if the field is left blank.

Regards

Marino

edit: can somebody mark this as the answer, pls?! I can't mark my own posts as answer... Thx