怎樣將完全可以運行的代碼改為動態目錄樹結構?問題解馬上決送500分！

Jeroki 2002-07-10 09:40:09

實現動態的意思是:每次從后台動態添加主次類別進入數据庫的時候,這里的目錄樹結構要跟著動態改變!不是簡單的定義几個常量!
本程式有兩文件test. asp 和tree.asp (可直接運行)
1。test.asp 調用類生成樹 代碼如下

<%@ Language=VBScript %>
<html>
<head>
<link rel="stylesheet" href="tree.css">
<title>tree</title>
</head>
<!-- #include file="tree.asp" -->
<%

'========================================
' BUILDING A TREE PROGRAMATICALLY
'========================================
' This approach would be best suited for building
' dynamic trees using For..Next loops and such.

Set MyTree2 = New Tree
MyTree2.Top = 10
MyTree2.Left = 10
MyTree2.ExpandImage = "plus.gif"
MyTree2.CollapseImage = "minus.gif"
MyTree2.LeafImage = "webpage.gif"

' Notice the indentation used to reprensent the hierarchy
Set Node1 = MyTree2.CreateChild("主類別1")//實現動態的意思是:每次從后台動態添加主次類別進入數据庫的時候,這里的目錄樹結構要跟著動態改變!不是簡單的定義几個常量!
Set SubNode1 = Node1.CreateChild("次類別1")
Set secSubNode1 = SubNode1.CreateChild("次類別11")
secSubNode1.CreateChild "<A HREF=""http://127.0.0.1/"">Child11</A>"
secSubNode1.CreateChild "<A HREF=""http://127.0.0.1/"">Child12</A>"
secSubNode1.CreateChild "<A HREF=""http://127.0.0.1/"">Child13</A>"

Set SubNode2 = Node1.CreateChild("次類別2")
SubNode2.CreateChild "<A HREF=""#"">Child21</A>"
SubNode2.CreateChild "<A HREF=""#"">Child22</A>"

Set Node2 = MyTree2.CreateChild("主類別2")
Node2.CreateChild "<A HREF=""#"">child001</A>"
Node2.CreateChild "<A HREF=""#""> child002</A>"
Node2.CreateChild "<A HREF=""#""> child002</A>"

MyTree2.Draw()

Set MyTree2 = Nothing

%>

</BODY>
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Jeroki 2002-07-11
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我的錶結构是這樣的:
表名:leibie
字段:id| classname| classs
id:自動編號(長整數)
classname:主類別名稱(文字類型)
classs:次類別名稱(文字類型)
S.F. 2002-07-11
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server push（很抱歉不能用asp）；

或者用客户端拖曳（目前聊天室采用的方法）；否则无法实现。
army9633 2002-07-10
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繁体看起来好累……换成简体哦，头都他大了
mings 2002-07-10
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这是不是意味着就是由数据库更新来触发客户端网页更新？

这个...基本上...很难做到吧～
mings 2002-07-10
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是不是就意味着
更改数据库的同时，要触发客户端网页的刷新？

这个...好像...很难做到～
Jeroki 2002-07-10
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由於受長度限制我必須在貼啦！
2。tree.asp代碼如下（ 類的定義 //這個文件不用修改!）

<%

Dim gblTreeNodeCount:gblTreeNodeCount = 1

Class TreeNode

Public Value
Public ExpandImage
Public CollapseImage
Public LeafImage
Public Expanded
Private mszName
Private mcolChildren
Private mbChildrenInitialized

Public Property Get ChildCount()
ChildCount = mcolChildren.Count
End Property

Private Sub Class_Initialize()
mszName = "node" & CStr(gblTreeNodeCount)
gblTreeNodeCount = gblTreeNodeCount + 1

mbChildrenInitialized = False
Expanded = False
End Sub

Private Sub Class_Terminate()
If mbChildrenInitialized And IsObject(mcolChildren) Then
mcolChildren.RemoveAll()
Set mcolChildren = Nothing
End If
End Sub

Private Sub InitChildList()
Set mcolChildren = Server.CreateObject("Scripting.Dictionary")
mbChildrenInitialized = True
End Sub

Private Sub LoadState()
If Request(mszName) = "1" Or Request("togglenode") = mszName Then
Expanded = True
End If
End Sub

Public Function CreateChild(szValue)

If Not mbChildrenInitialized Then InitChildList()

Set CreateChild = New TreeNode
CreateChild.Value = szValue
CreateChild.ExpandImage = ExpandImage
CreateChild.CollapseImage = CollapseImage
CreateChild.LeafImage = LeafImage

mcolChildren.Add mcolChildren.Count + 1, CreateChild

End Function

Public Sub Draw()

LoadState()

Response.Write "<table border=""0"">" & vbCrLf
Response.Write "<tr><td>" & vbCrLf

If Expanded Then
Response.Write "<a href=""javascript:collapseNode('" & mszName & "')""><img src=""" & CollapseImage & """ border=""0""></a>" & vbCrLf
ElseIf Not mbChildrenInitialized Then
Response.Write "<img src=""" & LeafImage & """ border=0>" & vbCrLf
Else
Response.Write "<a href=""javascript:expandNode('" & mszName & "')""><img src=""" & ExpandImage & """ border=""0""></a>" & vbCrLf
End If

Response.Write "</td>" & vbCrLf
Response.Write "<td>" & Value & "</td></tr>" & vbCrLf

If Expanded Then
Response.Write "<input type=""hidden"" name=""" & mszName & """ value=""1"">" & vbCrLf

If mbChildrenInitialized Then
Response.Write "<tr><td> </td>" & vbCrLf
Response.Write "<td>" & vbCrLf

For Each ChildNode In mcolChildren.Items
ChildNode.Draw()
Next

Response.Write "</td>" & vbCrLf
Response.Write "</tr>" & vbCrLf
End If
End If

Response.Write "</table>" & vbCrLf

End Sub

End Class


Class Tree

Public Top
Public Left
Public ExpandImage
Public CollapseImage
Public LeafImage
Private mszPosition
Private mcolChildren

Public Property Let Absolute(bData)
If bData Then mszPosition = "absolute" Else mszPosition = "relative"
End Property

Public Property Get Absolute()
Absolute = CBool(mszPosition = "absolute")
End Property

Private Sub Class_Initialize()
Set mcolChildren = Server.CreateObject("Scripting.Dictionary")
mnTop = 0
mnLeft = 0
mszPosition = "absolute"
End Sub

Private Sub Class_Terminate()
mcolChildren.RemoveAll()
Set mcolChildren = Nothing
End Sub

Public Function CreateChild(szValue)

Set CreateChild = New TreeNode

CreateChild.Value = szValue
CreateChild.ExpandImage = ExpandImage
CreateChild.CollapseImage = CollapseImage
CreateChild.LeafImage = LeafImage

mcolChildren.Add mcolChildren.Count + 1, CreateChild

End Function

Public Sub LoadTemplate(szFileName)
Dim objWorkingNode
Dim colNodeStack
Dim fsObj, tsObj
Dim szLine
Dim nCurrDepth, nNextDepth

Set colNodeStack = Server.CreateObject("Scripting.Dictionary")
Set fsObj = CreateObject("Scripting.FileSystemObject")
Set tsObj = fsObj.OpenTextFile(szFileName, 1)

nCurrDepth = 0
While Not tsObj.AtEndOfLine
nNextDepth = 1
szLine = tsObj.ReadLine()

If nCurrDepth = 0 Then
Set objWorkingNode = CreateChild(Trim(szLine))
nCurrDepth = 1
Else
While Mid(szLine,nNextDepth,1) = vbTab Or Mid(szLine,nNextDepth,1) = " "
nNextDepth = nNextDepth + 1
WEnd

If nNextDepth > 1 Then szLine = Trim(Mid(szLine,nNextDepth))

If szLine <> "" Then
If nNextDepth > nCurrDepth Then
If colNodeStack.Exists(nCurrDepth) Then
Set colNodeStack.Item(nCurrDepth) = objWorkingNode
Else
colNodeStack.Add nCurrDepth, objWorkingNode
End If

Set objWorkingNode = objWorkingNode.CreateChild(szLine)

nCurrDepth = nCurrDepth + 1
ElseIf nNextDepth <= nCurrDepth Then

If nNextDepth > 1 Then

nNextDepth = nNextDepth - 1
While Not colNodeStack.Exists(nNextDepth) And nNextDepth > 1
nNextDepth = nNextDepth - 1
WEnd

Set objWorkingNode = colNodeStack.Item(nNextDepth)
Set objWorkingNode = objWorkingNode.CreateChild(szLine)

nNextDepth = nNextDepth + 1
Else
Set objWorkingNode = CreateChild(szLine)
End If

nCurrDepth = nNextDepth
End If
End If

End If
WEnd

tsObj.Close()
Set tsObj = Nothing
Set fsObj = Nothing

colNodeStack.RemoveAll()
Set colNodeStack = Nothing

End Sub


Public Sub Draw()

AddClientScript()

Response.Write "<div id=""treectrl"" style=""left: " & Left & "px; top: " & Top & "px; position: " & mszPosition & ";"">" & vbCrLf
Response.Write "<form name=""treectrlfrm"" action=""" & Request.ServerVariables("SCRIPT_NAME") & """ method=""get"">" & vbCrLf
Response.Write "<table border=""0"">" & vbCrLf
Response.Write "<tr><td>" & vbCrLf

For Each ChildNode In mcolChildren.Items
ChildNode.Draw()
Next

Response.Write "</td></tr>" & vbCrLf
Response.Write "</table>" & vbCrLf

Response.Write "<input type=""hidden"" name=""togglenode"" value="""">" & vbCrLf
Response.Write "</form>" & vbCrLf
Response.Write "</div>" & vbCrLf

End Sub

Private Sub AddClientScript()
%>
<script language="JavaScript">

function expandNode(szNodeName)
{
if(document.layers != null) {
document.treectrl.document.treectrlfrm.togglenode.value = szNodeName;
document.treectrl.document.treectrlfrm.submit();
}
else {
document.all["treectrlfrm"].togglenode.value = szNodeName;
document.all["treectrlfrm"].submit();
}
}

function collapseNode(szNodeName)
{
if(document.layers != null) {
document.treectrl.document.treectrlfrm.elements[szNodeName].value = -1;
document.treectrl.document.treectrlfrm.submit();
}
else {
document.treectrlfrm.elements[szNodeName].value = -1;
document.treectrlfrm.submit();
}
}

</script>
<%
End Sub

End Class

%>
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