I use treegrid to see data store on database (mode nested).

jQuery("#table").jqGrid({
 datatype: "json",

 url:xxx.com,

editurl:xxx.com

jQuery("#table").jqGrid('navGrid',

    '#pager',

    {edit:true,add:false,del:true},

    {width:500, top:150,left:150},

    {},

    {width:500,

      reloadAfterSubmit:true,

      beforeSubmit:function(postdata, formid){// posdata = selrow id, formid = ''

        var dataRow = $('#ref_table').jqGrid('getRowData',postdata);

        var nodeOpen = $('#ref_table').jqGrid('getNodeParent',dataRow);

        jQuery("#ref_table").jqGrid('setGridParam',{"postData":{"nodeOpen":nodeOpen.id}});

        return [true,'Erreur => Oo local'];

      }})

Edit is ok.

But for delete :

jqgrid line 8278 :

if(rp_ge[$t.p.id].reloadAfterSubmit && $t.p.datatype != "local") {
  $($t).trigger("reloadGrid");
} else {

make this error

}

$t.p.datatype is local

=> no post to server

=> treegrid not reload

Ii must re-define this datatype or it's a bug ?