實現當TreeView中父節點的CheckBox的點選狀態改變時,回發服務器端,並且選中父節點，所有子節點全選中

實現當TreeView中父節點的CheckBox的點選狀態改變時
回發服務器端
觸發TreeView1_TreeNodeCheckChanged(object sender, TreeNodeEventArgs e)事件
從而通過代碼來控制子節點的CheckBox的點選狀態一同改變
主要步驟及代碼示例如下：
1.TreeView綁定onclick事件
通過本事件引發回發
2.在TreeView1_TreeNodeCheckChanged(object sender, TreeNodeEventArgs e)事件
編寫相關代碼控制子節點的CheckBox點選狀態
-------------------- HTML 頁面部分 -----------------------
<%@ Page Language="C#" CodeFile="1.aspx.cs"
Inherits="Manage_treeviewtest" %>
<head runat="server">
<title>無標題頁</title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<script type="text/javascript">
// 點擊複選框時觸發事件
function postBackByObject()
{
var o = window.event.srcElement;
if (o.tagName == "INPUT" && o.type == "checkbox")
{
__doPostBack("","");
}

}

//TreeView onclick觸發事件
function client_OnTreeNodeChecked(event) {
//得到當前所Click的對象
var objNode;
if (!public_IsObjectNull(event.srcElement)) {
//IE
objNode = event.srcElement;
}
else {
//FF
objNode = event.target;
}

//判斷是否Click的CheckBox
if (!public_IsCheckBox(objNode))
return;

var objCheckBox = objNode;
//根據CheckBox狀態進行相應處理
if (objCheckBox.checked == true) {
//遞歸選中父節點的CheckBox
setParentChecked(objCheckBox);

//遞歸選中所有的子節點
setChildChecked(objCheckBox);
}
else {
//遞歸取消選中所有的子節點
setChildUnChecked(objCheckBox);

//遞歸取消選中父節點(如果當前節點的所有其他同級節點也都未被選中).
setParentUnChecked(objCheckBox);
}
//getEle()
}

function getEle() {
debugger
var tree = document.getElementById("TreeView1").getElementsByTagName("INPUT");
for (var i = 0; i < tree.length; i++) {
if (tree[i].type == "checkbox" && tree[i].checked) {
alert(tree[i].nextSibling.firstChild.nodeValue + " " + tree[i].nextSibling.firstChild.text);
}
}
}

//判斷對象是否爲空
function public_IsObjectNull(element) {
if (element == null || element == "undefined")
return true;
else
return false;
}

//判斷對象是否爲CheckBox
function public_IsCheckBox(element) {
if (public_IsObjectNull(element))
return false;

if (element.tagName != "INPUT" || element.type != "checkbox")
return false;
else
return true;
}
//得到包含所有子節點的Node(Div對象)
function public_CheckBox2Node(element) {
var objID = element.getAttribute("ID");
objID = objID.substring(0, objID.indexOf("CheckBox"));
return document.getElementById(objID + "Nodes");
}
//得到父節點的CheckBox
function public_Node2CheckBox(element) {
var objID = element.getAttribute("ID");
objID = objID.substring(0, objID.indexOf("Nodes"));
return document.getElementById(objID + "CheckBox");
}
//得到本節點所在的Node(Div對象)
function public_GetParentNode(element) {
var parent = element.parentNode;
var upperTagName = "DIV";
//如果這個元素還不是想要的tag就繼續上溯
while (parent && (parent.tagName.toUpperCase() != upperTagName)) {
parent = parent.parentNode ? parent.parentNode : parent.parentElement;
}
return parent;
}

//設置節點的父節點Checked
function setParentChecked(currCheckBox) {
var objParentNode = public_GetParentNode(currCheckBox);
if (public_IsObjectNull(objParentNode))
return;

var objParentCheckBox = public_Node2CheckBox(objParentNode);

if (!public_IsCheckBox(objParentCheckBox))
return;

objParentCheckBox.checked = true;
setParentChecked(objParentCheckBox);
}

//當父節點的所有子節點都未被選中時,設置父節點UnChecked
function setParentUnChecked(currCheckBox) {
var objParentNode = public_GetParentNode(currCheckBox);
if (public_IsObjectNull(objParentNode))
return;
//判斷currCheckBox的同級節點是否都爲UnChecked.
if (!IsMyChildCheckBoxsUnChecked(objParentNode))
return;

var objParentCheckBox = public_Node2CheckBox(objParentNode);

if (!public_IsCheckBox(objParentCheckBox))
return;

objParentCheckBox.checked = false;
setParentUnChecked(objParentCheckBox);
}

//設置節點的子節點UnChecked
function setChildUnChecked(currObj) {
var currNode;
if (public_IsCheckBox(currObj)) {
currNode = public_CheckBox2Node(currObj);
if (public_IsObjectNull(currNode))
return;
}
else
currNode = currObj;

var currNodeChilds = currNode.childNodes;
var count = currNodeChilds.length;
for (var i = 0; i < count; i++) {
var childCheckBox = currNodeChilds[i];
if (public_IsCheckBox(childCheckBox)) {
childCheckBox.checked = false;
}
setChildUnChecked(childCheckBox);
}
}

//設置節點的子節點Checked
function setChildChecked(currObj) {
var currNode;
if (public_IsCheckBox(currObj)) {
currNode = public_CheckBox2Node(currObj);
if (public_IsObjectNull(currNode))
return;
}
else
currNode = currObj;

var currNodeChilds = currNode.childNodes;
var count = currNodeChilds.length;
for (var i = 0; i < count; i++) {
var childCheckBox = currNodeChilds[i];
if (public_IsCheckBox(childCheckBox)) {
childCheckBox.checked = true;
}
setChildChecked(childCheckBox);
}
}

//判斷該節點的子節點是否都爲UnChecked
function IsMyChildCheckBoxsUnChecked(currObj) {
var retVal = true;

var currNode;
if (public_IsCheckBox(currObj) && currObj.checked == true) {
return false;
}
else
currNode = currObj;

var currNodeChilds = currNode.childNodes;
var count = currNodeChilds.length;
for (var i = 0; i < count; i++) {
if (retVal == false)
break;
var childCheckBox = currNodeChilds[i];
if (public_IsCheckBox(childCheckBox) && childCheckBox.checked == true) {
retVal = false;
return retVal;
}
else
retVal = IsMyChildCheckBoxsUnChecked1(childCheckBox);
}
return retVal;
}

</script>
<div>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:TreeView ID="TreeView1" runat="server" ExpandDepth="0"
ShowCheckBoxes="All"
OnTreeNodeCheckChanged="TreeView1_TreeNodeCheckChanged">
</asp:TreeView>
</ContentTemplate>
<Triggers>
</Triggers>
</asp:UpdatePanel>
</div>
</form>
</body>
</html>

--------------------- cs頁面代碼 --------------------
public partial class Manage_treeviewtest : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
CreartAreaTree();

TreeView1.Attributes.Add("onclick", "postBackByObject(),client_OnTreeNodeChecked(null)");

}
}
/// <summary>
/// 選中某節點下的所有項
/// </summary>
/// <param name="node">節點</param>
/// <param name="state">是否點擊</param>
public void selectChildList(TreeNode node,bool state)
{
foreach (TreeNode childnode in node.ChildNodes)
{
childnode.Checked = state;
selectChildList(childnode,state);
}
}
protected void TreeView1_TreeNodeCheckChanged(object sender, TreeNodeEventArgs e)
{
CheckChildCheckBox(e.Node.Value, null);
lblFUnitNum.Text = "";
HiddenField1.Value = "";
getSelectedNode(null);

}

public void getSelectedNode(TreeNode pNode)
{
if (pNode == null)
{
foreach (TreeNode node in TreeView1.Nodes)
{
if (node.Checked)
{
HiddenField1.Value += node.Value + ",";
lblFUnitNum.Text += node.Text + ",";
}
getSelectedNode(node);
}
}
else
{
foreach (TreeNode node in pNode.ChildNodes)
{
if (node.Checked)
{
HiddenField1.Value += node.Value + ",";
lblFUnitNum.Text += node.Text + ",";
}
getSelectedNode(node);
}
}
}

//父級選中，子級也選中

private void CheckChildCheckBox(string selectNode, TreeNode pNode)
{
if (pNode == null)
{
foreach (TreeNode node in TreeView1.Nodes)
{
if (node.Parent != null)
{
if (node.Parent.Value == selectNode)
{
if (node.Parent.Checked == true)
{
node.Checked = true;
}
else
{
node.Checked = false;
}
}

//if (node.Checked == false)
//{
// node.Parent.Checked = false;
//}
}

CheckChildCheckBox(selectNode, node);
}
}
else
{
foreach (TreeNode node in pNode.ChildNodes)
{
if (node.Parent != null)
{
if (node.Parent.Value == selectNode)
{
if (node.Parent.Checked == true)
{
node.Checked = true;
}
else
{
node.Checked = false;
}
}
else
{
node.Parent.Checked = true;
}
}

//if (node.Checked == false)
//{
// node.Parent.Checked = false;
//}
CheckChildCheckBox(selectNode, node);
}
}
}