.net的web项目中treeview的checkbox的选中取消

 
<script language="javascript"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>

 

 <div style="border-style: none; border-color: inherit; border-width: 1px; overflow:scroll; height: 400px">
                       <table border="0" cellpadding="0" width="100%" cellspacing="0">
                         <tr>
                           <td valign="top">
                               <asp:TreeView ID="TreeView" runat="server" onclick="client_OnTreeNodeChecked(event);"  ExpandDepth="0" ShowCheckBoxes="All"  ShowLines="True"></asp:TreeView>
                           </td>
                         </tr>
                      </table>
                   </div>

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