Library tutorials & articles

TreeView Control

Editing Labels

The easiest way for the users to edit the labels (the text for each node) during run time is to set the TreeView control's LabelEdit property to tvwAutomatic. Now, like in explorer, when the item is clicked once, you can edit its caption

By using the AfterLabelEdit event, you can check that the new caption is valid, and that it is not empty:

Private Sub TreeView1_AfterLabelEdit(Cancel As Integer, NewString As String)
    If NewString = Empty Then
        '// new string is empty
        Msgbox "Please enter a new name"
        '// cancel edit
        Cancel = -1
    Else
        '// string ok
    End If
End Sub

There is also an BeforeLabelEdit event that occurs before the item is edited. You can use this to prevent the root item being edited, for example:

Private Sub TreeView1_BeforeLabelEdit(Cancel As Integer)
    If TreeView1.SelectedItem.Key = "root" Then
        '// item is root item
        Msgbox "You cannot edit the root items name"
        '// cancel edit
        Cancel = -1
    End If
End Sub

Comments

  1. 03 Mar 2005 at 21:58

    I tried your treeview example and when I try to add and image it is telling me that I need to initilaize the image first. Can you tell me what that means and how to fix it

  2. 28 May 2004 at 10:39

    I tried this and recieved the following: Compile error: variable not defined..."TreeView" is highlited...anyone have any ideas?

  3. 14 May 2004 at 17:19
    Very Good, You have helped me.

    gabriel medina
    gxsoft@hotmail.com
  4. 11 Aug 2003 at 20:25
    Good Example isn't it?
    http://www.pldental.com
  5. 24 Jun 2003 at 03:39

    Hi,


    Found this very good tutorial because its nearly exact the problem i have with my TreeView,...
    ...but unfortunatly, i can't get it to work...


    Set the same settings like in the tutorial, but nothing happens.
    I try to drag and drop, but it seems, there is no action by the script,...


    Any suggetions, what my failure could be?
    Thanx for help
    LittleMik

  6. 08 May 2003 at 16:40

    Enjoyed the piece on drag and drop treeview.  
    I use VS6 under XP and in that environment the DataObject declaration is
    Data As MSComctl2.DataObject
    rather than the reference in the posting
    Hyperlink to articles on DataSource and imagelist would be handy but they are both documented in MSDN if you throw the rigth incantation at it.


    Nigel

  7. 04 Mar 2003 at 23:00

    Just what i needed for a contact list im doing for my MSN Clone. Excellent!

  8. 30 Oct 2002 at 09:53

    Can this be implemented using ASP pages as well?


    Thanks.

  9. 15 Oct 2002 at 00:44
    Thank You Example I make this!!

    I hope someOne found this useful

    Private Sub Form_Load()
    With TreeView1
           .Style = tvwTreelinesPlusMinusPictureText
           .LineStyle = tvwRootLines
           .PathSeparator = "\"
           .Indentation = Screen.TwipsPerPixelX * 5 '256
           .LabelEdit = tvwManual
           .SingleSel = False
           .HideSelection = False
           .ImageList = ImageList1        
           .Refresh
    End With
    Call ShowEstructure
    End Sub



    Private Sub ShowEstructure()
    Dim i As Byte
    Dim j As Byte
    Dim k As Byte
    Dim Max As Byte
    Dim sp As String
    Dim sh As String
    Dim sh2 As String
    Dim TotalSecciones As Byte
    Dim TotalPosiciones As Byte

    Dim rsSeccions As New ADODB.Recordset
    Dim rsPositions As New ADODB.Recordset

    TreeView1.Nodes.Clear


    Set grsGral = New ADODB.Recordset
    grsGral.Open "EXEC spSQL_ShowDepartments", gConnectionString, adOpenStatic, adLockReadOnly, 1
    Max = grsGral.RecordCount


    For i = 1 To Max
           'Actual Node        
            sp = "nodo" & CStr(i)
           
           TreeView1.Nodes.Add , , sp, grsGral.Fields(1).Value, 1
           grsGral.MoveNext
    Next
    grsGral.MoveFirst

    For i = 1 To Max
     ' leaf
           sp = "nodo" & CStr(i)
           Set rsSeccions = New ADODB.Recordset
           rsSeccions.Open "EXEC spSQL_ShowSeccions_forThis '" & grsGral.Fields(0).Value & "'", gConnectionString, adOpenStatic, adLockReadOnly, 1
           TotalSecciones = rsSeccions.RecordCount
           
           For j = 1 To TotalSecciones
               ' relative son
               sh = sp & "-" & CStr(j) 'j
               TreeView1.Nodes.Add sp, tvwChild, sh, rsSeccions.Fields(0).Value, 2
               
               '*-*-*-
               
                Set rsPositions = New ADODB.Recordset
                   rsPositions.Open "EXEC spSQL_ShowPositions_forThis '" & rsSeccions.Fields(1).Value & "'", gConnectionString, adOpenStatic, adLockReadOnly, 1
                   TotalPosiciones = rsPositions.RecordCount
                   
                   For k = 1 To TotalPosiciones
                       ' La clave del nodo hijo, relativo al nodo sP
                       sh2 = sh & "-" & CStr(k) 'j
                       TreeView1.Nodes.Add sh, tvwChild, sh2, rsPositions.Fields(0).Value, 3
                       rsPositions.MoveNext
                   Next
                   Set rsPositions = Nothing
               '*--*-*-
               
               rsSeccions.MoveNext
           Next
           Set rsSeccions = Nothing
           grsGral.MoveNext
    Next

    Set grsGral = Nothing
    End Sub

  10. 27 May 2002 at 15:08

    Hoped to find some example using directories and files...

  11. 02 Apr 2002 at 12:37

    Sorry, I went back and read it more closely.  I just had to play around with the ImageList control to make it work.

  12. 02 Apr 2002 at 12:33

    I might have missed it, but I would have liked to have seen how to use images without having to go to the imagelist tutorial.  I know you mentioned imagelist, but perhaps a brief explanation of using the imagelist control with TreeView would have been in order.  If I missed it, I apologize.  Thank you for a very helpful tutorial.

  13. 01 Jan 1999 at 00:00

    This thread is for discussions of TreeView Control.

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