Disabling command button

[KawaUser]

I need to disable a command column button if a certain column has information in it.

Thanks,
Chuck

[Emanuel Varga]

Hello KawaUser.

Just use the CellFormatting event to do that, the following example should give you a basic example on how to do this:

void radGridView1_CellFormatting(object sender, CellFormattingEventArgs e)
{
    var commandCell = e.CellElement as GridCommandCellElement;
    if (commandCell != null)
    {
        if (someCondition)
        {
            commandCell.CommandButton.Enabled = false;
        }
        else
        {
            commandCell.CommandButton.Enabled = true;
        }
    }
}

Hope this helps, if you have any other questions or comments, please let me know,

Best Regards,
Emanuel Varga

Telerik WinForms MVP

[KawaUser]

Dim commandCell As GridCommandCellElement = e.CellElement

       If Not commandCell Is Nothing Then

           If e.Row.Cells("APPROVED_BY").Value = "" Then

               commandCell.Enabled = True

        else

        commandCell.Enabled = False

           End If

       End If

I put this together and it errors out. Any ideas?

[Emanuel Varga]

Errors out?

What exception is it throwing?


Best Regards,
Emanuel Varga

Telerik WinForms MVP

[KawaUser]

Exception has been thrown by the target of an invocation.

[Emanuel Varga]

Hello again,

I just noticed that you are disabling the cell, please follow my example, just disable the Button.


Best Regards,
Emanuel Varga

Telerik WinForms MVP

[KawaUser]

Dim commandCell As GridCommandCellElement = e.CellElement

      If Not commandCell Is Nothing Then

          If e.Row.Cells("APPROVED_BY").Value = "" Then

              commandCell.CommandButton.Enabled = True

          End If

      EndIf

[KawaUser]

I am still getting the error with the above code.

[Emanuel Varga]

Hello again,

Please check the name of the column and please first check for null Cell values.

Hope this helps, if you have any other questions or comments, please let me know,

Best Regards,
Emanuel Varga

Telerik WinForms MVP

[Svett]

Hello Chuck,

Could you share with us the code snippets from your application that show how you are adopting Emanuel's solution? This way, we will be able to give you an appropriate solution. Another option is to open a support ticket with an attached project where the issue occurs.

Best wishes,
Svett
the Telerik team

[KawaUser]

I have created a command cell button as the first column in the gridview. I created this using the columns collection window. 

I now need to disable buttons based on a value in the row, "Approved_By". If "Approved_By" is not = "" I need to disable the column. Meaning if this row has been approved disable the button respective to that row. 

I have not made any advance since I posted this last. Please Help!

Dim commandCell As GridCommandCellElement = e.CellElement

      If Not commandCell Is Nothing Then

          If e.Row.Cells("APPROVED_BY").Value = "" Then

              commandCell.CommandButton.Enabled = True

          End If

      EndIf

Thanks,

Chuck

[Emanuel Varga]

Hello again,

Could you please make the changes i've suggested in my previous post?

Best Regards,
Emanuel Varga

Telerik WinForms MVP

[Emanuel Varga]

Ok, i've missed something in your last post, you've forgot the else statement,

Try something like this:

Private Sub RadGridView1_CellFormatting(ByVal sender As System.Object, ByVal e As Telerik.WinControls.UI.CellFormattingEventArgs) Handles RadGridView1.CellFormatting
    If (TypeOf (e.CellElement) Is GridCommandCellElement) Then
        Dim commandCell As GridCommandCellElement = e.CellElement
        If Not commandCell Is Nothing Then
            If e.Row.Cells("Name").Value = "" Then
                commandCell.CommandButton.Enabled = True
            Else
                commandCell.CommandButton.Enabled = False
            End If
        End If
    End If
End Sub

Hope this helps, if you have any other questions or comments, please let me know,

Best Regards,
Emanuel Varga

Telerik WinForms MVP