jQuery Grid Plugin - jqGrid

This may sounds dumb, because it really is. I searched many places and couldnt find a clear description for the place where I should call afterSubmit once the field is edited and submit (I want to let users know if the record is saved or not)

My code is below (following the sample showed in doc)

jQuery(document).ready(function(){
  var lastSel;

  jQuery("#list").jqGrid({
    url:'somelink.php',
    datatype: 'json',
    jsonReader : {
      root: "rows",
      page: "page",
      total: "total",
      records: "records",
      repeatitems: true,
      cell: "cell",
      id: "id",
      userdata: "userdata",
      subgrid: {root:"rows",
        repeatitems: true,
        cell:"cell"
      }
    },
    onSelectRow: function(id){
          if(id && id!==lastSel){
        jQuery('#list').restoreRow(lastSel);
        lastSel=id;
          }
          jQuery('#list').editRow(id, true);
    },
    editurl: 'somelink.php?action=edit',

Any suggestion is really aprreciated. I've been pulling out my hairs *_*