Easyui-datagrid groupview分组后勾选问题

上面datagrid对应的代码如下：

$('#tbCheckOut').datagrid({
            title: '待分配库位',
            iconCls: 'icon-search',
             1112,
            height: 500,
            rownumbers: true,
            idField: 'ID',
            sortOrder: 'desc',
            sortName: 'ID',
            remoteSort: false,
            nowrap: false,
            collapsible: true,
            striped: true,
            fitColumns: false,
            pagesize: 10,
            pagination: true,
            url: '/StockOut/WebAjax/ProcCheckOutList.ashx',
            queryParams: convertArray($('#fmSearch').serializeArray()),
            onLoadSuccess: function (data) {
                $('#tbCheckOut').datagrid('collapseGroup'); //设置折叠
            },
            onDblClickCell: function (index, field, value) {
            },
            columns: [[
            { field: 'singlechk',  50, checkbox: true},
            { field: 'CheckOutType', title: '单据类型',  80, align: 'center', sortable: true, formatter: function (value, row) {
                return FGetCheckOutTypeInfo(value);
            }
            },
            { field: 'PostTime', title: '下单日期',  70, align: 'center', sortable: true, formatter: function (value, row) {
                return ChangeShortDateFormat(value);
            }
            },
            { field: 'K3OrderCode', title: '编号',  120, align: 'center', sortable: true },
            { field: 'SerialNo', title: '流水号',  120, align: 'center', sortable: true },
            { field: 'CustomName', title: '客户',  200, align: 'center', sortable: true, formatter: function (value, row) {
                var rtnStr = value; //todo 截取
                return rtnStr;
            }
            },
            { field: 'ItemSNCode', title: '物料编码',  120, align: 'center', sortable: true },
            { field: 'SKUCode', title: 'SKU',  50, align: 'center', sortable: true },
            { field: 'ItemSNName', title: '物料名称',  250, align: 'center', sortable: true },
            { field: 'AssignNum', title: '计划',  50, align: 'center', sortable: true },
            { field: 'ActualNum', title: '实际',  50, align: 'center', sortable: true },
            { field: 'HasAllotedNum', title: '已分配',  50, align: 'center', sortable: true },
            { field: 'UnitName', title: '单位',  50, align: 'center', sortable: true },
            { field: 'SpecificationsName', title: '规格型号',  60, align: 'center', sortable: true },
            { field: 'WarehouseName', title: '发货仓库',  100, align: 'center', sortable: true },
            { field: 'ChannelName', title: '渠道',  30, align: 'center', sortable: true },
            { field: 'ID', title: '操作',  120, align: 'center', formatter: function (value, row) {
                var rtnStr = "";
                if (row.Status == 0) {
                    rtnStr = '<a href="javascript:void()" class="gridAColor" onclick="FProcTask(1,' + value + ')">自动出库</a> <a href="javascript:void()" onclick="FProcTask(0,' + value + ')" class="gridAColor" >手动出库</a>';
                }
                return rtnStr;
            }
            }
        ]],
            groupField: 'K3OrderCode',
            view: groupview,

            groupFormatter: function (value, rows) {
                var rtnStr = "";
                rtnStr += '<input type="checkbox" onclick="FGPCkbClick(this)" helpGPVal="' + value + '" name="gpChk" />';
                rtnStr += value + ' 单据数量=' + rows.length + '条';
                var sumAssignNum = 0;
                var sumActualNum = 0;
                for (var i = 0; i < rows.length; i++) {
                    sumAssignNum += rows[i].AssignNum;
                    sumActualNum += rows[i].ActualNum;
                }
                rtnStr += " 计划量=" + sumAssignNum;
                rtnStr += " 实际量=" + sumActualNum;
                return rtnStr;
            }
        });

下面是实现该功能的几个js函数

 //分组ckb事件
    function FGPCkbClick(obj) {
        var gpVal = $(obj).attr("helpGPVal");
        var isChecked = $(obj).attr('checked') == 'checked' ? true : false;
        selectByGroup(isChecked, gpVal, '#tbCheckOut');
    }
    //分组选中 
    function selectByGroup(checked, value, tableIdSelector) {
        var groups = $(tableIdSelector).datagrid("options").view.groups;
        var rows;
        for (var i = 0; i < groups.length; i++) {
            if (groups[i].value == value) {
                rows = groups[i].rows;
                break;
            }
        }
        if (checked) {
            for (var i = 0; i < rows.length; i++) {
                $(tableIdSelector).datagrid("selectRow", $(tableIdSelector).datagrid("getRowIndex", rows[i]));
            }
        }
        else {
            for (var i = 0; i < rows.length; i++) {
                $(tableIdSelector).datagrid("unselectRow", $(tableIdSelector).datagrid("getRowIndex", rows[i]));
            }
        }
    }
    //datagrid顶部ckb事件
    function BoundCkbAllClick() {
        $('.datagrid-header-check input').click(function () {
            var isChecked = $(this).attr('checked');
            $('input[name="gpChk"]').each(function (index, elemetn) {
                //alert('90:' + $(this).attr('helpgpval'));
                if (isChecked == 'checked') {
                    $(this).attr('checked', isChecked);
                } else {
                    $(this).removeAttr('checked');
                }

            });
        });
    }

 感谢园友white knight提供的一个方法，完美解决