用js脚本控制asp.net下treeview的NodeCheck的实现代码

增加CheckBox联动的情况选择：
1.单选TreeView中的任一节点
2.当一节点CheckBox属性值改变时:子节点的CheckBox属性值跟随其改动,父节点不变;
父节点的所有子节点的CheckBox属性值都为false时才为false;有一个子节点的CheckBox属性值true时则为true.
3.当一节点CheckBox属性值改变时:子节点、父节点的CheckBox属性值跟随其改动;
父节点的所有子节点的CheckBox属性值都为false时才为false;有一个子节点的CheckBox属性值true时则为true.
javascript代码

function OnTreeNodeChecked(id, type) { 
//获取触发事件的对象 
var element = window.event.srcElement; 
//如果对象不是checkbox则不处理 
if (!IsCheckBox(element)) 
return; 
//获取checked状态 
var isChecked = element.checked; 
//获取tree对象 
var tree = TV2_GetTreeById(id); 
//获取element的相对结点(如果是叶结点，则就为element,否则为其<A>结点) 
var node = TV2_GetNode(tree, element); 
switch (type) { 
case "1": 
SetNodesUnChecked(tree); 
element.checked = true; 
break; 
case "2": 
TV2_SetChildNodesCheckStatus(node, isChecked); 
break; 
case "3": 
TV2_SetChildNodesCheckStatus(node, isChecked); 
var parent = TV2_GetParentNode(tree, node); 
TV2_NodeOnChildNodeCheckedChanged(tree, parent, isChecked); 
} 
} 
//set all nodes checkbox nochecked 
function SetNodesUnChecked(TreeNode) { 
var inputs = WebForm_GetElementsByTagName(TreeNode, "INPUT"); 
if (inputs == null || inputs.length == 0) 
return; 
for (var i = 0; i < inputs.length; i++) { 
if (IsCheckBox(inputs[i])) 
inputs[i].checked = false; 
} 
} 
//set child nodes checkbox status 
function TV2_SetChildNodesCheckStatus(node, isChecked) { 
//返回当前node所在的div层 
var childNodes = TV2i_GetChildNodesDiv(node); 
if (childNodes == null) 
return; 
var inputs = WebForm_GetElementsByTagName(childNodes, "INPUT"); 
if (inputs == null || inputs.length == 0) 
return; 
for (var i = 0; i < inputs.length; i++) { 
if (IsCheckBox(inputs[i])) 
inputs[i].checked = isChecked; 
} 
} 
//change parent node checkbox status after child node changed 
function TV2_NodeOnChildNodeCheckedChanged(tree, node, isChecked) { 
if (node == null) 
return; 
var childNodes = TV2_GetChildNodes(tree, node); 
if (childNodes == null || childNodes.length == 0) 
return; 
var isAllSame = true; 
for (var i = 0; i < childNodes.length; i++) { 
var item = childNodes[i]; 
var value = TV2_NodeGetChecked(item); 
if (isChecked != value) { 
isAllSame = false; 
break; 
} 
} 
var parent = TV2_GetParentNode(tree, node); 
if (isAllSame) { 
TV2_NodeSetChecked(node, isChecked); 
TV2_NodeOnChildNodeCheckedChanged(tree, parent, isChecked); 
} 
else { 
TV2_NodeSetChecked(node, true); 
TV2_NodeOnChildNodeCheckedChanged(tree, parent, true); 
} 
} 
//get node relative element(etc. checkbox) 
function TV2_GetNode(tree, element) { 
var id = element.id.replace(tree.id, ""); 
id = id.toLowerCase().replace(element.type, ""); 
id = tree.id + id; 
var node = document.getElementById(id); 
if (node == null) //leaf node, no "A" node 
return element; 
return node; 
} 
//get parent node 
function TV2_GetParentNode(tree, node) { 
var div = WebForm_GetParentByTagName(node, "DIV"); 
//The structure of node: <table>information of node</table><div>child nodes</div> 
var table = div.previousSibling; 
if (table == null) 
return null; 
return TV2i_GetNodeInElement(tree, table); 
} 
//get child nodes array 
function TV2_GetChildNodes(tree, node) { 
if (TV2_NodeIsLeaf(node)) 
return null; 
var children = new Array(); 
var div = TV2i_GetChildNodesDiv(node); 
var index = 0; 
for (var i = 0; i < div.childNodes.length; i++) { 
var element = div.childNodes[i]; 
if (element.tagName != "TABLE") 
continue; 
var child = TV2i_GetNodeInElement(tree, element); 
if (child != null) 
children[index++] = child; 
} 
return children; 
} 
function TV2_NodeIsLeaf(node) { 
return !(node.tagName == "A"); //Todo 
} 
function TV2_NodeGetChecked(node) { 
var checkbox = TV2i_NodeGetCheckBox(node); 
return checkbox.checked; 
} 
function TV2_NodeSetChecked(node, isChecked) { 
var checkbox = TV2i_NodeGetCheckBox(node); 
if (checkbox != null) 
checkbox.checked = isChecked; 
} 
function IsCheckBox(element) { 
if (element == null) 
return false; 
return (element.tagName == "INPUT" && element.type.toLowerCase() == "checkbox"); 
} 
//get tree 
function TV2_GetTreeById(id) { 
return document.getElementById(id); 
} 
////////////////////////////////////////////////////////////////////////////////////////////// 
//private mothods, with TV2i_ prefix 
////////////////////////////////////////////////////////////////////////////////////////////// 
//get div contains child nodes 
function TV2i_GetChildNodesDiv(node) { 
//如果node.tagName == "A"则不处理 
if (TV2_NodeIsLeaf(node)) 
return null; 
var childNodsDivId = node.id + "Nodes"; 
return document.getElementById(childNodsDivId); 
} 
//find node in element 
function TV2i_GetNodeInElement(tree, element) { 
var node = TV2i_GetNodeInElementA(tree, element); 
if (node == null) { 
node = TV2i_GetNodeInElementInput(tree, element); 
} 
return node; 
} 
//find "A" node 
function TV2i_GetNodeInElementA(tree, element) { 
var as = WebForm_GetElementsByTagName(element, "A"); 
if (as == null || as.length == 0) 
return null; 
var regexp = new RegExp("^" + tree.id + "n\\d+$"); 
for (var i = 0; i < as.length; i++) { 
if (as[i].id.match(regexp)) { 
return as[i]; 
} 
} 
return null; 
} 
//find "INPUT" node 
function TV2i_GetNodeInElementInput(tree, element) { 
var as = WebForm_GetElementsByTagName(element, "INPUT"); 
if (as == null || as.length == 0) 
return null; 
var regexp = new RegExp("^" + tree.id + "n\\d+"); 
for (var i = 0; i < as.length; i++) { 
if (as[i].id.match(regexp)) { 
return as[i]; 
} 
} 
return null; 
} 
//get checkbox of node 
function TV2i_NodeGetCheckBox(node) { 
if (IsCheckBox(node)) 
return node; 
var id = node.id + "CheckBox"; 
return document.getElementById(id); 
}

html代码

<asp:TreeView ID="TreeView1" runat="server" ImageSet="Msdn" ShowCheckBoxes="All" 
ShowLines="True" BorderWidth="0px" Height="430px" Width="250px" Font-Size="Small" 
OnClick="OnTreeNodeChecked()"> 
</asp:TreeView>