实现当TreeView中父节点的CheckBox的点选状态改变时,回发服务器端,并且选中父节点，所有子节点全选中

来源：互联网发布：柳岩与丁磊看望程序员编辑：程序博客网时间：2024/05/21 11:35

实现当TreeView中父节点的CheckBox的点选状态改变时
回发服务器端
触发TreeView1_TreeNodeCheckChanged(object sender, TreeNodeEventArgs e)事件
从而通过代码来控制子节点的CheckBox的点选状态一同改变
主要步骤及代码示例如下：
1.TreeView绑定onclick事件
通过本事件引发回发
2.在TreeView1_TreeNodeCheckChanged(object sender, TreeNodeEventArgs e)事件
编写相关代码控制子节点的CheckBox点选状态
-------------------- HTML 页面部分 -----------------------
<%@ Page Language="C#" CodeFile="1.aspx.cs"
Inherits="Manage_treeviewtest" %>
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<script type="text/javascript">
// 点击复选框时触发事件
function postBackByObject()
{
var o = window.event.srcElement;
if (o.tagName == "INPUT" && o.type == "checkbox")
{
__doPostBack("","");
}

}

//TreeView onclick触发事件
function client_OnTreeNodeChecked(event) {
//得到当前所Click的对象
var objNode;
if (!public_IsObjectNull(event.srcElement)) {
//IE
objNode = event.srcElement;
}
else {
//FF
objNode = event.target;
}

//判断是否Click的CheckBox
if (!public_IsCheckBox(objNode))
return;

var objCheckBox = objNode;
//根据CheckBox状态进行相应处理
if (objCheckBox.checked == true) {
//递归选中父节点的CheckBox
setParentChecked(objCheckBox);

//递归选中所有的子节点
setChildChecked(objCheckBox);
}
else {
//递归取消选中所有的子节点
setChildUnChecked(objCheckBox);

//递归取消选中父节点(如果当前节点的所有其他同级节点也都未被选中).
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);
}
}
}

//判断对象是否为空
function public_IsObjectNull(element) {
if (element == null || element == "undefined")
return true;
else
return false;
}

//判断对象是否为CheckBox
function public_IsCheckBox(element) {
if (public_IsObjectNull(element))
return false;

if (element.tagName != "INPUT" || element.type != "checkbox")
return false;
else
return true;
}
//得到包含所有子节点的Node(Div对象)
function public_CheckBox2Node(element) {
var objID = element.getAttribute("ID");
objID = objID.substring(0, objID.indexOf("CheckBox"));
return document.getElementById(objID + "Nodes");
}
//得到父节点的CheckBox
function public_Node2CheckBox(element) {
var objID = element.getAttribute("ID");
objID = objID.substring(0, objID.indexOf("Nodes"));
return document.getElementById(objID + "CheckBox");
}
//得到本节点所在的Node(Div对象)
function public_GetParentNode(element) {
var parent = element.parentNode;
var upperTagName = "DIV";
//如果这个元素还不是想要的tag就继续上溯
while (parent && (parent.tagName.toUpperCase() != upperTagName)) {
parent = parent.parentNode ? parent.parentNode : parent.parentElement;
}
return parent;
}

//设置节点的父节点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);
}

//当父节点的所有子节点都未被选中时,设置父节点UnChecked
function setParentUnChecked(currCheckBox) {
var objParentNode = public_GetParentNode(currCheckBox);
if (public_IsObjectNull(objParentNode))
return;
//判断currCheckBox的同级节点是否都为UnChecked.
if (!IsMyChildCheckBoxsUnChecked(objParentNode))
return;

var objParentCheckBox = public_Node2CheckBox(objParentNode);

if (!public_IsCheckBox(objParentCheckBox))
return;

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

//设置节点的子节点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);
}
}

//设置节点的子节点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);
}
}

//判断该节点的子节点是否都为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页面代码 --------------------
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>
/// 选中某节点下的所有项
/// </summary>
/// <param name="node">节点</param>
/// <param name="state">是否点击</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);
}
}
}

//父级选中，子级也选中

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);
}
}
}

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