请教TreeView的问题 - ASP.NET技术论坛

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javascript实现的checkbox选中方法的代码如下：

<script language="javascript" type="text/javascript">

function postBackByObject()
{

  var element = window.event.srcElement;
  if(window.event.button==0)

  if (!IsCheckBox(element))
  return;
  var isChecked = element.checked;
  var tree = TV2_GetTreeById("TreeView");
  var node = TV2_GetNode(tree,element);

  TV2_SetChildNodesCheckStatus(node,isChecked);
  var parent = TV2_GetParentNode(tree,node);
  TV2_NodeOnChildNodeCheckedChanged(tree,parent,isChecked);
}

//set child nodes checkbox status
function TV2_SetChildNodesCheckStatus(node,isChecked)
{
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(tree,node,isChecked);
TV2_NodeOnChildNodeCheckedChanged(tree,parent,isChecked);
}
else
{
TV2_NodeSetChecked(tree,node,false);
TV2_NodeOnChildNodeCheckedChanged(tree,parent,false);
}
}

//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;
}

//判断：只要该节点有一个字节点被选中，则该节点一定被选中
function TV2_NodeSetChecked(tree,node,isChecked)
{
var checkbox = TV2i_NodeGetCheckBox(node);
if(checkbox != null)
{
var childNodes = TV2_GetChildNodes(tree,node);
for(var i = 0; i < childNodes.length; i++)
{
var item = childNodes[i];
var value = TV2_NodeGetChecked(item);
if(value)
{
isChecked = true ;
break;
}
}
checkbox.checked = isChecked;
}
}

function IsCheckBox(element)
{
if(element == null)
return false;
return (element.tagName == "INPUT" && element.type.toLowerCase() == "checkbox");
}
function Isselectnode(element)
{
if(element == null)
return false;
return (element.tagName == "A" && element.class =="TreeView_0" );
}
//get tree
function TV2_GetTreeById(id)
{
return document.getElementById(id);
}

//////////////////////////////////////////////////////////////////////////////////////////////
//private mothods, with TV2i_ prefix
//////////////////////////////////////////////////////////////////////////////////////////////

//get div contains child nodes
function TV2i_GetChildNodesDiv(node)
{
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);
}

function SelectType_onchange() {
  if(SelectType.options(0).Text == "Calico")
  ;
}

</script>

服务器端代码
protected void Page_Load(object sender, EventArgs e)
  {
  if (!Page.IsPostBack)
  {
  TreeView.Attributes.Add("onclick", "postBackByObject()");
  if (Request.QueryString["BARCODE"] != null)
  {

  barcode = Request.QueryString["BARCODE"].ToString();
  //判断是否是自己发起的任务
  //disabledButton(Rid);
  Bind();
  }
  if (Request.QueryString["flag"] != null)
  {
  if (Request.QueryString["flag"].ToString() == "1")
  {
  VisibleBtn();
  }
  }
  }
  }