[SOLVED!] unable to retrieve detail list

[eluser]maria clara[/eluser]
hi, i already did the print_r() and it shows this in my console:

{
page: 0,
total: 0,
records: 0,
rows: []
}

and when i tried to put $_POST it shows an error.
i have here attached image of the listview and the detaillistview. when you select an item in the listview, the detaillistview will be shown but the jqgrid there is blank because of i can't retrieve the value of the $item.