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Setting the correct tabindex

Hi there,

I've got what I hope is a simple problem to solve...

Here's the back story: I have a windows form. On the form is a panel
containing three textboxes. Also on the form is a text box and an ok button.

Here's the problem: On condition A, I want input focus to go to a textbox on
the panel when the form loads. On condition B, I want the input focus to go
to the textbox that's on the form when the form loads. Seems pretty simple.

However, I've tried changing the tabindex of each of the text controls and
setting the focus property of the relevant control on form load, but to no
avail. I know there's got to be a simple way to do this!

Any help is appreciated :-)
May 30 '06 #1
3 2310
Mike Eaton wrote:
Here's the problem: On condition A, I want input focus to go to a textbox on
the panel when the form loads. On condition B, I want the input focus to go
to the textbox that's on the form when the form loads. Seems pretty simple.

TabIndex only goes so far and, in this case, not far enough.
Youneed to forcibly move focus to another contorl, but you can't do that
in Form_Load. The Form (and hence the Control) isn't visible, so won't
accept focus - you have to wait until the Form appears, which is where
the Activated event comes in.

Try this:

Private m_PendingFocus As Control = Nothing

Private Property PendingFocus() as Control
Return m_PendingFocus
End Get
Set(Value as Control)
m_PendingFocus = Value
End Set
End Property

Private Sub Form_Activated( ... ) Handles MyBase.Activate d
If Not (m_PendingFocus Is Nothing) Then
m_PendingFocus. Focus()
m_PendingFocus = Nothing
End If
End Sub

Private Sub Form_Load( ... ) Handles MyBase.Load
If ConditionA Then
Me.PendingFocus = TextBoxOnPanel
' Do Nothing - the existing Tab Order will do
End If
End Sub

Phill W.
May 31 '06 #2
Hi Phil,

I tried the approach you suggested and had no success. Here are some more
The current tabindex is set as:
0 - uxTxtCheckAmoun t : the text box whose parent is the form (and should
have focus most of the time)
1 - the form's OK button
2 - the form's Cancel button
3 - the panel that hosts the other three text boxes. their tabindex is set
3.0.0, 3.0.1, and 3.0.2 according to the Tab Order viewer in the IDE. 3.0.0
is the tabindex of the text box uxTxtRouting that I want to have focus some
of the time.

Here's the relevant code I'm using based on what you suggested:

Private _pendingFocus As Control = Nothing

Private Property PendingFocus() As Control
Return _pendingFocus
End Get
Set(ByVal Value As Control)
_pendingFocus = Value
End Set
End Property

Private Sub ItemValidationF orm_Activated(B yVal sender As Object, ByVal e
As System.EventArg s) Handles Me.Activated
If Not (_pendingFocus Is Nothing) Then
_pendingFocus.F ocus()
_pendingFocus = Nothing
End If
End Sub

Private Sub ItemValidationF orm_Load(ByVal sender As Object, ByVal e As
System.EventArg s) Handles Me.Load
If (_check.MicrErr or) Then
MsgBox("error.. blah..blah", MsgBoxStyle.Cri tical, Me.Text)
Me.PendingFocus = uxTxtRouting
' text box focused via tabindex
End If
End Sub

The PendingFocus property is being accessed correctly during the activation
event, but the form always appears with the uxTxtCheckAmoun t textbox .

Any ideas?
May 31 '06 #3
Mike Eaton wrote:
If (_check.MicrErr or) Then
MsgBox("error.. blah..blah", MsgBoxStyle.Cri tical, Me.Text)
Me.PendingFocus = uxTxtRouting The PendingFocus property is being accessed correctly during the activation
event, but the form always appears with the uxTxtCheckAmoun t textbox .

Have you tried setting me.PendingFocus /before/ showing the MsgBox?
I don't know for certain (but wouldn't be in the least bit surprised)
if showing a dialog over a Form doesn't cause the Form to get Activated

Phill W.
Jun 1 '06 #4

This thread has been closed and replies have been disabled. Please start a new discussion.

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