Cancel out of transaction in OnItemCommand

[Mikhail]

Hello everyone,
Is there a snippet of code that allows you to cancel out of the update (or delete, add, etc) transaction inside the OnItemCommand? I would first like to show an alert box, focus on a textbox, and leave the page as it is without updating it.

I am doing this using a grid with inline editing, ajax enabled.

Here is my code behind:

    Protected Sub RadGrid1_ItemCommand(ByVal source As Object, ByVal e As GridCommandEventArgs)
        If ((e.CommandName = "Update") AndAlso (TypeOf e.Item Is GridEditableItem)) Then
            Dim editeditem As GridEditableItem = CType(e.Item, GridEditableItem)
            Dim txtName As TextBox = CType(editeditem("NameColumn").Controls(0), TextBox)
            If txtName.Text = "" Then
                Utils.ShowMessage("Please enter a value for the name.", Page)
                txtName.Focus()
                ' Cancel out of update transaction
            End If
        End If

Is there a better way of doing the exact same logic as above? If there is, please let me know too!

Thanks!

[Mikhail]

Well I was able to solve the cancelling out of the transaction. I just used e.Canceled = true.

now i am having troubles in displaying the alert box inside the ItemCommand function

    Protected Sub RadGrid1_ItemCommand(ByVal source As Object, ByVal e As GridCommandEventArgs)
        If ((e.CommandName = "Update") AndAlso (TypeOf e.Item Is GridEditableItem)) Then
            Dim editeditem As GridEditableItem = CType(e.Item, GridEditableItem)
            Dim txtName As TextBox = CType(editeditem("NameColumn").Controls(0), TextBox)
            If txtName.Text = "" Then

                ' Cancel out of update transaction
                e.Canceled = True
                Utils.ShowMessage("Please enter a value for the name.", Page)
                txtName.Focus()
            End If
        End If
    End Sub

My Utils.ShowMessage is:

    Public Shared Sub ShowMessage(ByVal sMessage As String, ByVal page As Page)

        sMessage = sMessage.Replace(ControlChars.CrLf, "<BR>")
        page.ClientScript.RegisterStartupScript(page.GetType, "", "<script language=""javascript"">" & _
                               "alert('" & sMessage & "');" & _
                             "</script>")
    End Sub

Is it a problem to pop up an alert box inside ItemCommand?

[Sebastian]

Hello Mikhail,

If you ajaxified the grid via RadAjaxManager, consider utilizing its ResponseScripts collection to show the alert dialog. Alternatively, show RadWindow in alert mode.

Best regards,
Stephen
the Telerik team

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