How to make the datagrid not load data from the url that i assigned?

because every i assign an url to datagrid, it will automatic load the data...
nb :
1. i don't want passing empty data to datagrid using .datagrid('loadData', {"total":0,"rows":[]}) in onLoadSuccess
2. i don't want to delete the data row by row like using .datagrid('deleteRow',{}) in onLoadSuccess
3. i don't want to assign the url in outline..or separated from the datagrid itself
i am sorry if i am missing something on documentation maybe...or it just my mistake..andthanks in advance