Probably you should set the datatype to “local”.

You can also use data parameter of jqGrid to create grid having the data. Try data: mydata where var mydata defined as [{id:0, colName:”cel1″}] (here colName should be replace to the name property of the column). If the name of the first colimn is not id, you can add key:true property to the definition of the first column.

If all this should work with tree grid I recommend you to look at the answer which include demos.

Best regards
Oleg