...
 $("#editgrid").jqGrid('navGrid', '#pagered', {
                        add:  true,
                        edit:  true,
                        del:  true,
                        search:false,
                        refresh:true
                    },
                    {
                        width:700,beforeSubmit : function() {
                            var success="true";
                            var message="Error";
                            var formarray = $('#FrmGrid_editgrid').serializeArray();
                            $.ajax({
                                url      : '../CheckWasteComp?wasteId=${param.wasteId}', 
                                data     : formarray,
                                type     : 'get',
                                success  : function(data) { 
                                    success=false;
                                                                      
                                }
                            });
                            return [success, message];
                        }
                        
                    } ,
                 );