datagrid选中行传id到编辑页，获取不到行id值？

 <div data-toggle="topjui-layout" data-options="fit:true">
        <div data-options="region:'center',title:'',fit:true,split:true,border:false">
            <!-- datagrid表格 -->
            <table data-toggle="topjui-datagrid"
                   data-options="id: 'demandDg',
               fitColumns:false,
                url: '/nc/demand/List'">
                <thead>
                    <tr>
                        <th data-options="field:'id',title:'',checkbox:true"></th>
                        <th data-options="field:'DemandNo',title:'任务编码'"></th>
                        <th data-options="field:'DemandName',title:'任务名称',width:200"></th>
                        <th data-options="field:'DemandType',title:'任务类型'"></th>
                        <th data-options="field:'DemandFrom',title:'任务来源'"></th>
                        <th data-options="field:'AttachUrl',title:'附件'"></th>
                        <th data-options="field:'CreateUserName',title:'创建者'"></th>
                        <th data-options="field:'DemandNo',title:'接收者'"></th>
                        <th data-options="field:'DemandNo',title:'验证者'"></th>
                        <th data-options="field:'EndDate',title:'完成期限'"></th>
                        <th data-options="field:'State',title:'任务状态'"></th>
                        <th data-options="field:'CreateDate',title:'创建日期'"></th>
                    </tr>
                </thead>
            </table>
        </div>
    </div>