jQuery Grid Plugin - jqGrid

hi all,

i am new to jqgrid, am giving ajax call and rendering data one by one in grid, i am not intrested in server side sorting so made 

 sortable: true, //to enable sorting 

loadonce: true, // to enable sorting on client side 

as i am adding data manually i set 

datatype: "local",  

i m adding data by using:

$("#grid").jqGrid('addRowData',i+1,row);

on click on column  

my data get disapperes, my 113 rows directly reduces to 20, all other rows are not displayed..

plz help me in this, to rectify my problem.