asp.net treeview控件动态加载数据，选中父节点和子节点处理

所用的javascript代码：


<script type="text/javascript">
    function public_GetParentByTagName(element, tagName) 
     { 
        var parent = element.parentNode; 
        var upperTagName = tagName.toUpperCase(); 
        //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Cheched――该节点可访问，则他的父节点也必能访问 
    function setParentChecked(objNode) 
    { 
        var objParentDiv = public_GetParentByTagName(objNode,"div"); 
        if(objParentDiv==null || objParentDiv == "undefined") 
        { 
            return; 
        } 
        var objID = objParentDiv.getAttribute("ID"); 
        objID = objID.substring(0,objID.indexOf("Nodes")); 
        objID = objID+"CheckBox"; 
        var objParentCheckBox = document.getElementById(objID); 
        if(objParentCheckBox==null || objParentCheckBox == "undefined") 
        { 

            return; 
        } 
        if(objParentCheckBox.tagName!="INPUT" && objParentCheckBox.type == "checkbox") 
        return; 
        objParentCheckBox.checked = true; 
        setParentChecked(objParentCheckBox); 
    }

    //设置节点的子节点uncheched――该节点不可访问，则他的子节点也不能访问 
    function setChildUnChecked(divID) 
    { 
        var objchild = divID.children; 
        var count = objchild.length; 
        for(var i=0;i <objchild.length;i++) 
        { 
            var tempObj = objchild[i]; 
            if(tempObj.tagName=="INPUT" && tempObj.type == "checkbox") 
            { 
                tempObj.checked = false; 
            } 
            setChildUnChecked(tempObj); 
        } 
    }

   //设置节点的子节点cheched――该节点可以访问，则他的子节点也都能访问 
    function setChildChecked(divID) 
    { 
        var objchild = divID.children; 
        var count = objchild.length; 
        for(var i=0;i <objchild.length;i++)