一.在窗體的設計模式下,選擇ActiveX控制元件,然後找到 Microsoft TreeView Control 6.0(SP6) ,確定
二.資料表的設計.重點在處理NodeID與ParentNodeID這兩個欄位的關係上.
三.TreeView資料的載入.下圖是TreeView控制元件的所有事件.可以看到它本身是沒有專用的載入事件的.需要在窗體的Load事件中或者其他事件處理TreeView的資料載入問題.
載入資料:
Tree.Nodes.Clear '先清空,不然Key 會重複 Dim Rec As DAO.Recordset Dim Node As Node Dim isql As String isql = "SELECT 'S'+MID(CSTR(100000+NodeID),2,5) AS NID ,'S'+MID(CSTR(100000+ParentNodeID),2,5) AS PID,NodeName FROM BomProList where 啟用狀態=-1" Set Rec = CurrentDb.OpenRecordset(isql) Rec.MoveLast n = Rec.RecordCount Rec.MoveFirst For i = 0 To n - 1 If Rec!PID = "S00000" Then If n = 1 Then Set Node1 = Tree.Nodes.Add(, , "S" & Rec!NID, "無此BOM資料") Else Set Node1 = Tree.Nodes.Add(, , "S" & Rec!NID, Rec!NodeName) End If Else Set Node1 = Tree.Nodes.Add("S" & Rec!PID, tvwChild, "S" & Rec!NID, Rec!NodeName) End If Rec.MoveNext Next '釋放資源 Rec.Close Set Rec = Nothing
四.TreeView節點的摺疊與展開
Function TreeExpanded(Tree, Bool) '設定節點的展開與縮放 Dim i As Long For i = 1 To Tree.Nodes.Count Tree.Nodes(i).Expanded = Bool 'True展開所有節點,False 收起所有節點 Next i If Bool Then Forms!BOM管理!Command80.Caption = "摺疊" '設定按鈕的狀態 Tree.Nodes(1).Selected = True '展開後tree會被滾動到最底下的節點,需要後動設定,讓捲軸回到tree的第一個節點 Else Forms!BOM管理!Command80.Caption = "展開" End If End Function