This mean that you do not have a proper rowid set in the main grid.

subgrid_id is a combination of the rowid+"_id".

Regards

Tony

(i also tried to check myself it does not show .'("#"+subgrid_id)'does not give any element .

Please help.

this is the grid code:-

 jQuery("#list1").jqGrid({
         url:url_const,
         datatype: "xml",
         colNames:colnames,
         colModel:colmodel,
         mtype:'GET',
         height:'350',
        rowNum:15,
        rowList:[10,15,20,25,30],
        imgpath: "themes/green/images",
        pager: jQuery('#pager1'),
        sortname: 'ip',
        viewrecords: true,
        sortorder:"desc" ,
       caption:"Session Comparision Table",
       subGrid:true,
       subGridRowExpanded: function(subgrid_id, row_id)
       { 
          var subgrid_table_id, pager_id;
          subgrid_table_id = subgrid_id+"_t";
          pager_id = "p_"+subgrid_table_id;
          var tempval="<table id='"+subgrid_table_id+"' class='scroll'></table><div id='"+pager_id+"' class='scroll'></div>";
          $("#"+subgrid_id).html(tempval);
          jQuery("#"+subgrid_table_id).jqGrid({
              url:suburl_const+"&id="+row_id,
              datatype: "xml",
              mtype:'GET',
              colNames: subcolname,
              colModel: subcolmodel,
              rowNum:5,
              pager: pager_id,
              imgpath: "themes/sand/images",
              sortname: 'port',
              sortorder: "asc",
              height: '100%' })}
       });
    
});