jQuery Grid Plugin - jqGrid

Ok, I figured it out, modifing a bit the "search bigset " example I achived what I needed, here is the code:

jQuery("#bigset").jqGrid({
                    url:'datos',
                    datatype: "json",
                    height: 255,
                    colNames:['Index','Name', 'Code'],
                    colModel:[
                              {name:'item_id',index:'item_id'},
                              {name:'item',index:'item'},
                              {name:'item_cd',index:'item_cd'} ],
                    rowNum:10,
                    rowList:[10,20,30],
                    mtype: "POST",
                   
                    width:796,
                    hidegrid:true,
                    loadonce: true, 
                    pager: '#pagerb',
                   
                    sortname: 'item_id',
                    viewrecords: true,
                    sortorder: "asc"
                   
                });

                var timeoutHnd;
                var flAuto = false;
                function doSearch(ev){
                    if(!flAuto) return;
                    // var elem = ev.target||ev.srcElement;
                    if(timeoutHnd)
                        clearTimeout(timeoutHnd)
                    timeoutHnd = setTimeout(gridReload,500)
                }
                function gridReload(){
                    var nm_mask = jQuery("#item_nm").val();
                    var cd_mask = jQuery("#search_cd").val();                    
                     jQuery("#bigset").jqGrid('setGridParam',{datatype:'json'});
                    jQuery("#bigset").jqGrid('setGridParam', {url:"buscar?nm_mask="+nm_mask+"&cd_mask="+cd_mask,page:1}).trigger("reloadGrid");
                  
                }

The key here is initializing the grid with loadonce:true, and datatype:'json', then before reloding the grid we change the datatype:'json', again.

The result, the grid reloads by ajax, and does paging and sorting on client side.

Bye.