I Am Having Trouble With Recursively Viewing The Treeview Control

Mar 28, 2005

Reference: http://support.microsoft.com/Default.aspx?kbid=209891



Hi I am trying to create a treeview based on a table that I created. I am trying to create a treeview that fills the treeview recursively but for some reason I am only able to see the parent node and not the children


Here are the specs that I have so far

I have a table called "tblTreeview"
I have tree fields
"txtID"
"txtNode"
"txtRelationship"
I also have a form called "frmTreeview"
I named my treeview control "axtreeview"

here is the code that I copied off the link that I referenced at the beginning of this thread.

The only thing that is different is the name of the fields.

'--Beginning Code --
Private Sub Form_Load()
Const strTableQueryName = "tblTreeview"
Dim db As DAO.Database, rst As DAO.Recordset
Set db = CurrentDb
Set rst = db.OpenRecordset(strTableQueryName, dbOpenDynaset, dbReadOnly)
AddBranch rst:=rst, strPointerField:="txtRelationship", strIDField:="txtID", strTextField:="txtNode"
End Sub

'================= AddBranch Sub Procedure ======================
' Recursive Procedure to add branches to TreeView Control
'Requires:
' ActiveX Control: TreeView Control
' Name: xTree
'Parameters:
' rst: Self-referencing Recordset containing the data
' strPointerField: Name of field pointing to parent's primary key
' strIDField: Name of parent's primary key field
' strTextField: Name of field containing text to be displayed
'================================================= ============
Sub AddBranch(rst As Recordset, strPointerField As String, _
strIDField As String, strTextField As String, _
Optional varReportToID As Variant)
On Error GoTo errAddBranch
Dim nodCurrent As Node, objTree As TreeView
Dim strCriteria As String, strText As String, strKey As String
Dim nodParent As Node, bk As String
Set objTree = Me!axTreeView.Object
If IsMissing(varReportToID) Then ' Root Branch.
strCriteria = strPointerField & " Is Null"
Else ' Search for records pointing to parent.
strCriteria = BuildCriteria(strPointerField, _
rst.Fields(strPointerField).Type, "=" & varReportToID)
Set nodParent = objTree.Nodes("a" & varReportToID)
End If

' Find the first emp to report to the boss node.
rst.FindFirst strCriteria
Do Until rst.NoMatch
' Create a string with LastName.
strText = rst(strTextField)
strKey = "a" & rst(strIDField)
If Not IsMissing(varReportToID) Then 'add new node to the parent
Set nodCurrent = objTree.Nodes.Add(nodParent, tvwChild, strKey, strText)
Else ' Add new node to the root.
Set nodCurrent = objTree.Nodes.Add(, , strKey, strText)
End If
' Save your place in the recordset so we can pass by ref for speed.
bk = rst.Bookmark
' Add employees who report to this node.
AddBranch rst, strPointerField, strIDField, strTextField, rst(strIDField)
rst.Bookmark = bk ' Return to last place and continue search.
rst.FindNext strCriteria ' Find next employee.
Loop

exitAddBranch:
Exit Sub

'--------------------------Error Trapping --------------------------
errAddBranch:
MsgBox "Can't add child: " & Err.Description, vbCritical, "AddBranch Error:"
Resume exitAddBranch
End Sub

'--End Code--

Thanks

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