jqGrid在搜索中仅显示“IsNull”和“Is Not Null”选项

Question

我使用jqGrid 4.15.6-pre与local数据类型。我已启用multipleSearch: true但我只获得“IsNull”和“Is Not Null”作为搜索选项。以下是我的代码

 $("#dataGrid").jqGrid({
            datatype: "local",
            data: mydata,
            colNames: ['Student_ID', 'STATUS', 'TYPE', 'DESCRIPTION', 'COPIES'],
            colModel: [
                            { name: 'Student_ID', index: 'Student_ID', width: 80},
                            { name: 'STATUS', index: 'STATUS', width: 160 },
                            { name: 'TYPE', index: 'TYPE', width: 180 },
                            { name: 'DESCRIPTION', index: 'DESCRIPTION', width: 180 },
                            { name: 'COPIES', index: 'COPIES', width: 180 }
            ],
            pager: '#pagingGrid',
            sortname: 'Student_ID',
            gridview: true,
            rownumbers: true,
            viewrecords: true,
            loadonce: true,
            gridview: true,
            sortorder: "desc",
            caption: 'Just simple local grid',
            height: '100%'
        });

        $("#dataGrid").jqGrid('navGrid', '#pagingGrid', { edit: false, add: false, del: false }, {}, {}, {}, { multipleSearch: true, closeAfterSearch: true });