js操作VS控件TreeView

    <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) {
                var objID = objNode.getAttribute("ID");
                var tmpIndex = objID.replace("MainContent_treen", ""); //MainContent_treen2CheckBox
                var index = tmpIndex.replace("CheckBox", "");
                objID = "MainContent_treet" + index;
                $("#<%=lblParentName.ClientID %>").text($("#" + objID).text());
                var action = '<%=_action %>';
                if (action != "")
                    $("#<%=txtCategoryName.ClientID %>").val($("#" + objID).text());
                public_SetAllUnChecked(objCheckBox);
            } else {
                var objID = objNode.getAttribute("ID");
                var tmpIndex = objID.replace("MainContent_treen", ""); //MainContent_treen2CheckBox
                var index = tmpIndex.replace("CheckBox", "");
                objID = "MainContent_treet" + index;
                $("#<%=lblParentName.ClientID %>").text("Root");
            }
        }

        function public_SetAllUnChecked(objCheckBox) {
            $("[id^=MainContent_treen]").each(function (i) {
                $(this).parent().removeClass("checked");
                $(this).attr("checked", false);
                $(objCheckBox).attr("checked", true);
                $(objCheckBox).parent().addClass("checked");
            });
        }

        //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;
        }
    </script>