關于TreeView控件專題
2.運行時無法顯示
一般是TreeView的版本問題，最好下載英文版自動安裝版本重新安裝，安裝前應該先到添加刪除程序里卸掉原版本
3.顯示格式出錯（非樹狀顯示）
TreeView要求客戶端瀏覽器版本為IE5.5及以上，最好要求客戶端升級為IE6.0
4.框架里使用TreeView
設置NavigateUrl、Target屬性，可更新另外的Frame
5.找不到TreeNode類
使用TreeView，最好添加namespace：using Microsoft.Web.UI.WebControls;
6.遍歷TreeView節(jié)點(遞歸算法)
private void Page_Load(object sender, System.EventArgs e)
{
GetAllNodeText(TreeView1.Nodes);
}
void GetAllNodeText(TreeNodeCollection tnc)
{
foreach(TreeNode node in tnc)
{
if(node.Nodes.Count!=0)
GetAllNodeText(node.Nodes);
Response.Write(node.Text + " ");
}
}
7.得到node結點的父節(jié)點
TreeNode pnode;
if(node.Parent is TreeNode)
pnode=(TreeNode)node.Parent;
else
//node is root node
8.修改TreeView樣式（示例）
<iewc:TreeView id="TreeView1" runat="server" HoverStyle="color:blue;background:#00ffCC;"
DefaultStyle="background:red;color:yellow;" SelectedStyle="color:red;background:#00ff00;">
用代碼：
TreeView1.DefaultStyle["font-size"] = "20pt";
1.設置所選節(jié)點，如選中第二個節(jié)點
function SetSelNode()
{
TreeView1.selectedNodeIndex="1";
}
2.得到所選節(jié)點的Text，ID或NodeData
function GetAttribute()
{
alert(TreeView1.getTreeNode(TreeView1.selectedNodeIndex).getAttribute("Text"));
}
替換Text為ID或NodeData，可分別得到所選節(jié)點的ID或NodeData
3.修改節(jié)點屬性，如修改第一個節(jié)點的Text
function ModifyNode()
{
var node=TreeView1.getTreeNode("0");
node.setAttribute("Text","hgknight");
}
4.將點擊的結點的值賦到控件上，附判斷是否為末級結點
function GetNodeData()
{
indexid=TreeView1.clickedNodeIndex;
var data = TreeView1.getTreeNode(indexid).getAttribute("Id");
var txt =TreeView1.getTreeNode(indexid).getAttribute("NodeData");
var NodeArray=new Array();
NodeArray=TreeView1.getTreeNode(indexid).getChildren();
if (NodeArray.length>0)
{alert("只能選擇末級結點");}
else
{
parent.document.getElementById('T1').value=data;
parent.document.getElementById('iframe1').style.display='none';
}
}
5.添加節(jié)點
function AddNode()
{
var node=TreeView1.createTreeNode();
node.setAttribute("Text","hgknight");
TreeView1.add(node);
}
6.js遍歷所有節(jié)點
//只針對根結點，大家把它可改為遞歸形式
var NodeArray=new Array();
NodeArray=TreeView1.getChildren();
for(i=0;i<NodeArray.length;i++)
{
cNode=NodeArray[i];
alert(cNode.getAttribute("Text"));
}
4、如何判斷 TreeView 的一個節(jié)點下是否有子節(jié)點？？？
if(selNode.Nodes.Count==0){
//該節(jié)點沒有字節(jié)點
}
5、如何得到 TreeView 的當前選擇節(jié)點？？？
1.Tree.GetNodeFromIndex(Tree.SelectedNodeIndex.ToString())
2.private void TreeView1_SelectedIndexChange(object sender,
Microsoft.Web.UI.WebControls.TreeViewSelectEventArgs e)
e.NewNode即為所選節(jié)點
1222 為TreeView添加Onclick事件,取得nodata的值
后臺的Page_Load中
TreeView1.Attributes.Add("onclick","GetNodeData();")
前臺javascript中：
function GetNodeData()
{
indexid=TreeView1.clickedNodeIndex;
var data = TreeView1.getTreeNode(indexid).getAttribute("NodeData");
document.getElementById('TB13').value=data;
}
'此函數將把tr下所有結點都展開
Private Function ExPan(ByVal tr As TreeNode) As TreeNode
Dim i As Integer
For i = 0 To tr.Nodes.Count - 1
tr.Nodes(i).Expanded = True
If tr.Nodes(i).Nodes.Count > 0 Then
ExPan(tr.Nodes(i))
End If
Next
End Function
void creat_node(string
name,Microsoft.Web.UI.WebControls.TreeNode t1,string number)
{
//定義一個新的結點
Microsoft.Web.UI.WebControls.TreeNode t2=new
Microsoft.Web.UI.WebControls.TreeNode();
t2.ID=number;
t2.Text=name;
//判斷是否為根結點
TreeView1.ExpandedImageUrl="images/Depart03.bmp";
if(t1.ID.Trim()=="###")
{
TreeView1.Nodes.Add(t2);
t2.ImageUrl="images/Depart01.bmp";
}
else
{
t1.Nodes.Add(t2);
t2.ImageUrl="images/Depart01.bmp";
t1.ImageUrl="images/Depart02.bmp";
}
//取得這個結點的所有子結點，利用遞歸自動生成
string mySelectQuery = "SELECT ParentID, ID,Name FROM table1
where ParentID='" + number +"'";
string MyConnString="provider=Microsoft.Jet.OLEDB.4.0;Data
Source="+Server.MapPath(".")+"/dt/mydata.mdb";
OleDbConnection myConnection = new
OleDbConnection(MyConnString);
OleDbCommand myCommand = new
OleDbCommand(mySelectQuery,myConnection);
myConnection.Open();
OleDbDataReader myReader;
myReader = myCommand.ExecuteReader();
while (myReader.Read())
{
creat_node(myReader.GetString(2),t2,myReader.GetString(1));
}
myReader.Close();
myConnection.Close();
}
private void CreateProviderTreeBtn_Click(object sender,
System.EventArgs e)
{
Microsoft.Web.UI.WebControls.TreeNode t1=new
Microsoft.Web.UI.WebControls.TreeNode();
creat_node("",t1,"###");
7、怎樣使用TreeView???
//初始化TreeView數據
private void InitTV(int intVOrderLen)
{
SqlDataReader dr;
SqlCommand myCommand;
string strSel = "select * from bas_enterprise where
len(vieworder)="+intVOrderLen+" order by vieworder";
myCommand = new SqlCommand (strSel, myConnection);
dr=myCommand.ExecuteReader();
while (dr.Read ())
{
TreeNode pNode=new TreeNode ();
pNode.Text =dr["EntpName"].ToString ();
pNode.ID =dr["ViewOrder"].ToString ();
TreeView1.Nodes .Add (pNode);
}
dr.Close ();
}
private void TreeView1_SelectedIndexChange(object sender,
Microsoft.Web.UI.WebControls.TreeViewSelectEventArgs e)
{
TreeNode NewNode=TreeView1.GetNodeFromIndex
(TreeView1.SelectedNodeIndex);
string strNodeId=NewNode.ID .ToString ();
SqlDataReader dr;
SqlCommand myCommand;
int intVOrderLen=strNodeId.Length+2;
string strSel = "select * from bas_enterprise where
len(vieworder)="+intVOrderLen+" and vieworder like '%"+strNodeId+"__%'
order by vieworder";
myCommand = new SqlCommand (strSel, myConnection);
dr=myCommand.ExecuteReader();
NewNode.Nodes .Clear();
while (dr.Read ())
{
TreeNode pNode=new TreeNode ();
pNode.Text =dr["EntpName"].ToString ();
pNode.ID =dr["ViewOrder"].ToString ();
NewNode.Nodes.Add (pNode);
}
dr.Close ();
TreeView1.ExpandLevel=1;
}
8、在treeview中如何查找一個值，并選中它？
問題:
各位，在已經建好的樹中如何查找一個文本或者是treenodes的id，找到后選中它？
答案:
for(int i=0;i<TreeView1.Nodes.Count;i++)
if(TreeView1.Nodes[i]==TextBox1.Text)
{
string index1=TreeView1.Nodes[i].GetNodeIndex();//取得index
TreeView1.SelectedNodeIndex=index1;
}
9、如何取得TreeView中各項的值？？
private void TreeView1_SelectedIndexChange(object sender,
Microsoft.Web.UI.WebControls.TreeViewSelectEventArgs e)
{
Microsoft.Web.UI.WebControls.TreeNode
NewNode=TreeView1.GetNodeFromIndex(TreeView1.SelectedNodeIndex);
Label1.Text =NewNo
如果通過代碼要在父結點中增加子節(jié)點,代碼如何實現(xiàn)?
父節(jié)點代碼如下:
TreeNode pNode = new TreeNode();
pNode.ID = "Root";
pNode.Text = strNodeName;
TreeView1.Nodes.Add(pNode);
如果要在根結點"Root"下面再增加子節(jié)點,如何寫代碼?
TreeView1.Nodes.AddAt(pNode);這種方式好象不行.
TreeView1.Nodes[0].Nodes.Add(pNewNode);
/*************.Cs 中的代碼****************************
string strScript="<script language=\"javascript\" >";
strScript+=" function GetNode() \n"+"{ \n";
strScript+=" alert(TreeView1.getTreeNode(TreeView1.clickedNodeIndex).getAttribute('Text'));\n" ;
strScript+=" alert(TreeView1.getTreeNode(TreeView1.clickedNodeIndex).getAttribute('CheckBox'));\n";
strScript+=" alert(TreeView1.getTreeNode(TreeView1.clickedNodeIndex).getAttribute('Checked'));\n";
strScript+=" if (TreeView1.getTreeNode(TreeView1.clickedNodeIndex).getAttribute('Checked'))\n";
strScript+=" TreeView1.getTreeNode(TreeView1.clickedNodeIndex).setAttribute('Checked','false');\n";
strScript+=" else \n";
strScript+=" TreeView1.getTreeNode(TreeView1.clickedNodeIndex).setAttribute('Checked','true');\n";
strScript+=" \n } \n";
strScript+="</script>";
if(! this.IsClientScriptBlockRegistered("myjs"))
{
this.RegisterClientScriptBlock("myjs",strScript);
}
***************************************************//
現(xiàn)在我想在客戶端點擊父節(jié)點的checkbox則下級也被選中，可是使用下面的代碼，只能表面選中，在服務器端卻得不到，請問有什么其它好法子
<script language=\"javascript\" >
function GetNode()
{
var choose;
var indexid;
indexid=TreeView1.clickedNodeIndex;
if (TreeView1.getTreeNode(indexid).getAttribute('Checked'))
{
choose=false;
}
else
{
choose=true;
}
TreeView1.getTreeNode(indexid).setAttribute('Checked',choose);
var NodeArray=new Array();
NodeArray=TreeView1.getTreeNode(indexid).getChildren();
for(i=0;i<NodeArray.length;i++)
{
var tempindex=indexid+"."+i;
TreeView1.getTreeNode(indexid).setAttribute('Checked',choose);
}
}
//-->
</script>
