CustomValidator inside Datagrid, DataList, DataRepeater

[ghafranabbas]

This is how you use the customvalidator control in any INamingContainer
interface control (Datagrid, DataList, DataRepeater, etc).

1. In the ItemTemplate, place your customvalidator
2. Set the OnServerValidate property of the customvalidator
3. Get reference to the Data Item object
(For DataList is DataListItem, for DataGrid its DataGridItem)
4. Get reference to any controls needed for validation
5. Perform the validation

Below is an example, where the two textboxes inside the ItemTemplate of
a DataList control cannot have the same value.

'=============Begin Code===================

<script runat="server">
Private Sub ValidateCustomValidator(ByVal source As System.Object,
ByVal args As System.Web.UI.WebControls.ServerValidateEventArgs)

Dim DataItem As DataListItem = CType(source,
CustomValidator).NamingContainer
Dim txt1 As TextBox = DataItem.FindControl("TextBox1")
Dim txt2 As TextBox = DataItem.FindControl("TextBox2")
If txt1.Text = txt2.Text Then
args.IsValid = False
End If
End Sub
</script>

<aspataList id="DataList1" runat="server">
<ItemTemplate>
<asp:TextBox id="TextBox1" runat="server"></asp:TextBox>
<asp:TextBox id="TextBox2" runat="server"></asp:TextBox>
<asp:CustomValidator id="CustomValidator1" runat="server"
ErrorMessage="Cannot Be The Same"
OnServerValidate="ValidateCustomValidator">*</asp:CustomValidator>
</ItemTemplate>
</aspataList>

'=============End Code===================

 

[Tmez]

What if you validation Control (RequiredFieldValidator, RegularExpressionValidator)

Since those controls do not expose the OnserverValidate property, I had to find an alternate method.

1. Use any validation control that you want
2. On the code behind, use Page.Validate()
a. Page.Validate() will force the entire page to validate again; hence, trigger your validation controls to take action again 8) .
3. If you don't want the entire page then simply use Page.Validate (ValidationGroupName) where ValidationGroupName is the validation group name in your validation controls.
4. Now I am waiting for the client-side way to do this please...