jqgrid reload grid after successful inline update / inline creation of record

I'm wondering how I can trigger reloadGrid after an inline edit of a row.

<script type="text/javascript">

    jQuery(document).ready(function(){
      var lastcell; 
      jQuery("#grid").jqGrid({
          url:'{{ json_data_handler }}?year={{ get_param_year }}&month={{ get_param_month }}&project_id={{ get_param_project_id }}',
          datatype: "json",
          mtype: 'GET',
          colNames:['hour_record_pk', 'project_pk', 'weekday', 'date', 'sum', 'description'],
          colModel:[
                    {name:'hour_record_pk',index:'hour_record_pk', width:55, sortable:false, editable:true, editoptions:{readonly:true,size:10}},
                    {name:'project_pk',index:'project_pk', width:55, sortable:false, editable:true, editoptions:{readonly:true,size:10}},
                    {name:'weekday',index:'weekday', width:300, editable:false, sortable:false},
                    {name:'date_str',index:'date_str', width:300, editable:true, sortable:false, editoptions:{readonly:true}},
                    {name:'sum',index:'sum', width:100, editable:true, sortable:true,editrules:{number:true,minValue:0,maxValue:24,required:true}},
                    {name:'description',index:'description', width:600, editable:true, sortable:false,},
               ],
         jsonReader : {
              repeatitems:false
         },
          rowNum:31,
          rowList:[10,20,31],
          //pager: jQuery('#gridpager'),
          sortname: 'id',
          viewrecords: true,
          sortorder: "asc",
          width: 800,
          height: 750,
          caption:"Hour Record Overview",
          reloadAfterEdit: true, //seems to have no effect
          reloadAfterSubmit: true, //seems to have no effect
          onSelectRow: function(id){    
                if(id && id!==lastcell){
                    jQuery('#grid').jqGrid('restoreRow',lastcell);
                    jQuery('#grid').jqGrid('editRow',id,true);