Asp.Net TreeView 复选框选择

<asp:TreeView ID="TreeView1" runat="server"  ShowCheckBoxes="All" onclick="client_OnTreeNodeChecked(event);">
</asp:TreeView>

<script type="text/javascript">
//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);
}
}

//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 = IsMyChildCheckBoxsUnChecked(childCheckBox);
}
return retVal;
}
</script>