TreeView
ASP.NET最简单的例子,不过是VB的
Private Sub LoadTree1()
Dim myClassDepartment As New ClassDepartment(Application("ConnectString"))
Dim myClassDepartmentData As ClassDepartmentData
Dim myNode As Microsoft.Web.UI.WebControls.TreeNode
Dim i As int64
Dim myData As ArrayList = myClassDepartment.List(Session("LoginUserID"), " len(a.F12)=4 ")
'加入行数据
For i = 0 To myData.Count - 1
'从数组中读取数据
myClassDepartmentData = myData.Item(i)
'新加入节点
myNode = New Microsoft.Web.UI.WebControls.TreeNode
myNode.CheckBox = True
myNode.ID = myClassDepartmentData.F12
myNode.Text = "<b>" & myClassDepartmentData.F3 & "</b>"
If strsub(myClassDepartmentData.F12, Session("LoginUserDepartmentCode")) Then myNode.Expanded = True
Call LoadTree2(myNode, myClassDepartment)
treeDwxx.Nodes.Add(myNode)
Next
myClassDepartment.CloseDatabase()
myClassDepartment = Nothing
End Sub
Private Sub LoadTree2(ByVal ParentNode As Microsoft.Web.UI.WebControls.TreeNode, ByVal myClassDepartment As ClassDepartment)
Dim myClassDepartmentData As ClassDepartmentData
Dim myNode As Microsoft.Web.UI.WebControls.TreeNode
Dim i As int64
Dim myData As ArrayList = myClassDepartment.List2(Session("LoginUserID"), " len(a.F12)=8 AND Left(a.F12,4)='" & ParentNode.ID & "'")
'加入行数据
For i = 0 To myData.Count - 1
'从数组中读取数据
myClassDepartmentData = myData.Item(i)
'新加入节点
myNode = New Microsoft.Web.UI.WebControls.TreeNode
myNode.CheckBox = True
myNode.ID = myClassDepartmentData.F12
myNode.Text = "<b>" & myClassDepartmentData.F3 & "</b>"
If strsub(myClassDepartmentData.F12, Session("LoginUserDepartmentCode")) Then myNode.Expanded = True
Call LoadTree3(myNode, myClassDepartment)
ParentNode.Nodes.Add(myNode)
Next
End SubTop
2 楼zjz26(♂匆匆过客♂)回复于 2005-08-24 16:27:14 得分 0
有C#的吗?
Top
3 楼lc666(别以为头上戴条内裤就觉得自己很酷,你丫纯粹是装B!)回复于 2005-08-24 16:33:44 得分 0
strSQL="select distinct year(ConsignDate) as 年份 from PostInputInfo order by 年份 desc";
DataTable dtTemp=ds.GetTable(strSQL,false);
foreach(DataRow drTemp in dtTemp.Rows)
{
if(drTemp[0] !=DBNull.Value)
{
strYear=drTemp[0].ToString();
TreeNode node1=new TreeNode();
node1.Text =strYear + " 年";
this.tvwSheet.Nodes.Add(node1);
strSQL="select distinct month(ConsignDate) as 月份 from PostInputInfo where year(ConsignDate)=" + strYear + " order by 月份";
DataTable dt=ds.GetTable(strSQL,false);
foreach(DataRow dr in dt.Rows)
{
strMonth=dr[0].ToString();
TreeNode node2=new TreeNode();
node2.Text =strMonth + " 月";
node1.Nodes.Add(node2);
}
}
}Top
4 楼cuilj(一云忆水)回复于 2005-08-24 16:56:10 得分 0
tv.BackColor = Color.White;
tv.ExpandLevel = 3;
tv.Nodes.Clear();
TreeNode ParentTn = new TreeNode();
tv.Nodes.Add(ParentTn );
TreeNode tn = new TreeNode();
ParentTn.Nodes.Add(tn);Top
5 楼GDNPC(烟锁池塘柳,炮镇海城楼)回复于 2005-08-24 17:01:05 得分 50
private void LoadTree()
{
//Initial root node
TreeNode aTreeNode = new TreeNode();
//aTreeNode.Text = Session["LessionName"].ToString();
aTreeNode.Text = Session["LessonName"].ToString();
aTreeNode.ImageUrl="images/root.gif";
aTreeNode.SelectedImageUrl="images/root.gif";
aTreeNode.Target = "FraMain";
//
//aTreeNode.NavigateUrl = "admin/ContentAddSub.aspx?LessonID="+Server.UrlEncode(Session["LessonID"].ToString());
aTreeNode.NavigateUrl = "Content.aspx?LessonID="+Server.UrlEncode("101");
aTreeView.Nodes.Add(aTreeNode);
aTreeView.Nodes[0].Expanded=true;
//this.LoadChildNodes(aTreeNode,Session["LessonID"].ToString());
this.LoadChildNodes(aTreeNode,"101");
}
private void LoadChildNodes(TreeNode parent,string LessonID)
{
TreeNode aTreeNode;
string aLessionID;
MenuClass aMenuClass = new MenuClass();
DataTable dt = aMenuClass.GetMenuItem(LessonID).Tables[0];
foreach(DataRow row in dt.Rows)
{
aLessionID = row.ItemArray[0].ToString();
aTreeNode = new TreeNode();
aTreeNode.Text = row.ItemArray[1].ToString();
aTreeNode.Target = "FraMain";
//
aTreeNode.NavigateUrl = "Content.aspx?LessonID="+Server.UrlEncode(aLessionID);
parent.Nodes.Add(aTreeNode);
if(row.ItemArray[2].ToString()=="1")
{
LoadChildNodes(aTreeNode,aLessionID);
}
}
}Top
6 楼sunnystar365(一个人的天空)回复于 2005-08-25 10:32:02 得分 0
从数据库读取节点信息
保存节点信息的 Table 基本结构为
1、全部读取并一次性展现
private void Page_Load(object sender, System.EventArgs e)
{
if(IsPostBack)
{
return;
}
DBSystem.ExecuteSQL tmp = new DBSystem.ExecuteSQL("T");
DataTable dt = tmp.GetDataTable("select * from TreeView");//从数据库抓出数据
this.AddNodes(dt,null,"0"); //添加节点
this.TreeView1.SelectedNodeIndex=""; //不选中任何节点。
/*下一节将介绍如何修改TreeView.cs 源码来取消默认选中节点的方法*/
}
///
/// 添加节点及其包含的子节点
///
/// 从数据库抓出的 DataTable
/// 将要添加子节点的父节点
/// 父节点的 ID,“0” 为根节点
private void AddNodes(DataTable dt,TreeNode node,string id)
{
DataRow[] rows = dt.Select("ParentID="+id); //筛选出属于父节点 “node”的子节点集合
foreach(DataRow dr in rows) //循环子节点集合
{
TreeNode nd = new TreeNode();
nd.NavigateUrl=dr["URL"].ToString(); //设置浏览的网址
nd.NodeData=dr["NodeID"].ToString(); //存放节点 ID
nd.Text=dr["NodeName"].ToString(); //设置节点名称
this.AddNodes(dt,nd,nd.NodeData); //递归,添加该节点的子节点
if(node==null || id=="0")
{
this.TreeView1.Nodes.Add(nd); //添加至根节点
}
else
{
node.Nodes.Add(nd); //添加子节点
}
}
2、 展开节点时读取该节点的数据
TreeView 控件属性→ 自动提交(AutoPostBack) → True
TreeView 控件属性→ 事件 → 双击展开(Expand)
private void Page_Load(object sender, System.EventArgs e)
{
if(!IsPostBack)
{
this.AddSingleNode(null,"0"); //找出根节点
}
this.TreeView1.SelectedNodeIndex=""; //不选中任何节点
}
///
/// 展开节点时,触发的事件
///
/// TreeView 控件
///
private void TreeView1_Expand(object sender, Microsoft.Web.UI.WebControls.TreeViewClickEventArgs e)
{
TreeNode nd = this.TreeView1.GetNodeFromIndex(e.Node); //找到触发事件的节点,即正在展开的节点
if(nd.Nodes[0].NodeData=="") //第一次加载,即只有“正在加载……”这一项
{
this.AddSingleNode(nd,nd.NodeData); //加载子节点
}
}
///
/// 只查找、添加单个节点下的子节点
///
/// 需要添加子节点的 TreeNode
/// 该节点的 NodeID
private void AddSingleNode(TreeNode node,string id)
{
if(node!=null && id!="0")
{
node.Nodes.Clear();//清空节点,主要是把“正在加载……”这一项移除
}
DBSystem.ExecuteSQL tmp = new DBSystem.ExecuteSQL("T");
DataTable dt = tmp.GetDataTable("select * from TreeView where ParentID="+id);//从数据库抓出数据
foreach(DataRow dr in dt.Rows) //历遍所有子节点
{
TreeNode nd = new TreeNode();
nd.NavigateUrl=dr["URL"].ToString(); //设置浏览的网址
nd.NodeData=dr["NodeID"].ToString(); //存放节点 ID
nd.Text=dr["NodeName"].ToString(); //设置节点名称
TreeNode child = new TreeNode(); //此节点只作为“nd”展开的依据,并无它意
child.Text="正在加载……";
nd.Nodes.Add(child);
if(node==null|| id=="0")
{
this.TreeView1.Nodes.Add(nd); //添加至根节点
}
else
{
node.Nodes.Add(nd); //添加子节点
}
}
}
五、 修改“TreeView.cs”源码,取消 TreeView 默认选中节点
1、TreeView.cs 文件
在文中﹐找到 “ protected override void OnLoad(EventArgs e)”事件
“ protected override void OnPreRender(EventArgs e)” 事件,修改以下代码
if ((SelectedNodeIndex == "" || SelectedNodeIndex == String.Empty) && Nodes.Count > 0)
//SelectedNodeIndex = "0"; //修改前
SelectedNodeIndex = ""; //修改后
2、TreeView.htc 文件
在“C:\Inetpub\wwwroot\webctrl_client\1_0\ TreeView.htc”中找到“function ondocumentready()”把以下代码注释掉
// verify selectedNodeIndex
/****************** Change By Jerry On 2005-01-25 ******************/
/*
if (getNodeFromIndex(selectedNodeIndex) == null) { if (getNodeFromIndex("0") != null) selectedNodeIndex = "0"; else selectedNodeIndex = ""; }
*/
/****************** Change By Jerry On 2005-01-25 ******************/
在“function tryToBuildTreeFromRoot()”修改以下代码
if (selectedNodeIndex.length == 0)
{
//prop_selectedNodeIndex = "0"; //修改前
prop_selectedNodeIndex = ""; //修改后
}
3、使用
修改“TreeView.cs”后,重新编译一次,生成新的“Microsoft.Web.UI.WebControls.dll”。应用时只需要设置“SelectedNodeIndex”为 “” 即可
this.TreeView1.SelectedNodeIndex=""; //不选中任何节点。
六、 使用 XML 文档创建 TreeView
1、XML 文档的要求
a) 描述节点名称是固定的“”与“”
b) 虽然 XML 文文件对字母的大小写严格区分,但绑定时会忽略
c) “”节点中的属性,必须与 TreeView 控件中的 TreeNode 属性对应
d) “”节点中的文本不能写在节点内,只能以 “Text”属性出现,如“Node01”行不通,应为“”
以下是一个可用于“TreeView”控件绑定源的范例﹕
2、绑定的代码
this.TreeView1.TreeNodeSrc="TreeXML.xml";
this.TreeView1.DataBind();