如何在编辑时获取jqGrid单元格值

var rowData = $("#jqGrid").jqGrid('getRowData', rowid);

var cellValue = $("#jqGrid").jqGrid('getCell', rowid, 'columnName');

$("#jqGrid").jqGrid('editGridRow', rowid, {
    afterSubmit: function(response, postdata) {
        var cellValue = postdata.newValue;
    }
});

$("#jqGrid").jqGrid('saveRow', rowid, {
    aftersavefunc: function(rowid, response) {
        var cellValue = $(this).jqGrid('getCell', rowid, 'columnName');
    }
});