Get selected row when use Responsive table

lucacali87

Hi, I have a problem with responsive table. When I resize the window and button was hidden this code doesn't work:

$('#usersTable tbody').on( 'click', 'button', function () {
        usernameSelected = (userTable.row( $(this).parents('tr') ).data().username);
    } );

Maybe the problem is on parents('tr'), but how can I get information when table was resized? I use the returned value to recognize the button of which row is clicked.
My table use ajax call. Thanks