用JS控制TreeView中的Checkbox

html:

<asp:TreeView ID="tvLimit" runat="server" ShowCheckBoxes="All" onclick="javascript:GoClick();"   
                                ShowLines="True" ExpandDepth="0"></asp:TreeView>

js:

<script >
 function GoClick()
 {    
   var obj = event.srcElement;
   if(obj.tagName.toUpperCase() != "INPUT") return;
   var tb = obj.parentElement.parentElement.parentElement.parentElement;//当前节点的Table
   SelAllChildren(tb,obj.checked);
  
   tb=  tb.parentElement;//
   
   while(true)
   {
      tb = tb.previousSibling 
       if( tb == null) return; 
      SetParentCheckBoxStatus(tb);
      tb=  tb.parentElement
      if( tb == null) return; 
   }    
 } 
 
 function SelAllChildren(tb,bChecked)
 {
    var div = tb.nextSibling;
   try
   {
    for(var i=0;i<div.children.length;i++)
    {
       
        if(div.children[i].tagName.toUpperCase()!="TABLE")continue;
        var chkBox= FindRowCheckBox(div.children[i].rows[0]);
        if(chkBox == null) continue;
        chkBox.checked = bChecked;
        
        SelAllChildren(div.children[i],bChecked);        
    }
    }catch(e){}
 }
 function SetParentCheckBoxStatus(objTb)
 {
    var div = objTb.nextSibling;
     
    var bSelAll = true;
    var bSelOne = false;
    for(var i=0;i<div.children.length;i++)
    {        
        if(div.children[i].tagName.toUpperCase()!="TABLE")continue;
        
        var chkBox= FindRowCheckBox(div.children[i].rows[0]);
        
        if(!chkBox.checked)
        {
            bSelAll =false;
        }else
        {
            bSelOne = true;
        }
    }    
    
    if(objTb.rows!= null)
    {
        var chkBox = FindRowCheckBox(objTb.rows[0])
        chkBox.checked  = bSelOne;        
    } 
 }
 
 function FindRowCheckBox(tr)
 {
    for(var i=0;i<tr.cells.length;i++)
    {
        if(tr.cells[i].firstChild.tagName == "INPUT")
        {
            return tr.cells[i].firstChild;
        }
    }
 }

</script>