jQuery Grid Plugin - jqGrid

I am trying to reload the data in pivot on change of combo box.

where data is locally created json array, which may change on change of combo box option.

 

Tried :

$(#grid).clearGridData(true);

$(#grid).setGridParam({"datatype" : "json", "data" : jsonData }); // also tried datatype : local / clientSide

where $(#grid) is pivot grid.

This is not working. Can you please help 

Thanks in advance.