Unable to Expand Subgid in jqgird

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MVC

JQGrid

loadComplete: function () {
                        new ElementMaxHeight();
                        
                        var ids = jQuery('#' + subgrid_table_id).jqGrid('getDataIDs');
                                                   ids = jQuery("#" + subgrid_table_id).jqGrid('getDataIDs');
                        //                        }
                        for (var i = 1; i <= ids.length; i++) {
                            jQuery("#" + subgrid_table_id).jqGrid('editRow', i, true);
                        }

When I trying to expand subgrid of jqgrid value of variable ids.length value become undefined if IE set the browser mode of IE9 and Document mode iE7 but in other document mode value of variable ids.length coming properly but I am facing design issue for other document mode I am using jquerry 1.7.2