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Tip of the Day
Language: VB4,VB5,VB6
Expertise: beginner
Sep 11, 1999



Building the Right Environment to Support AI, Machine Learning and Deep Learning

Highlight the contents of a control on entry

You probably already know that you can highlight the contents of any textbox by adding two lines of code in its GotFocus event:

Private Sub Text1_GotFocus()
    Text1.SelStart = 0 
    Text1.SelLength = Len(Text1.Text)
End Sub
This approach, however, fail shorts when you have dozens of textboxes on your form, and forces you to duplicate the above lines for each and every control. A much better technique is to add a Timer to the form, set its Interval property to a non-zero value (for example, 500 milliseconds is a good choice for this technique) and then add this code to its Timer event procedure:

Private Sub Timer1_Timer()
    Static Ctrl As Control
    On Error Resume Next

    If Not (Ctrl Is ActiveControl) Then
        Set Ctrl = ActiveControl
        ' If the new control isn't a TextBox or a ComboBox, the
        ' following two statements are ignored
        Ctrl.SelStart = 0
        Ctrl.SelLength = Len(Ctrl.Text)
    End If
End Sub
Francesco Balena
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