Use drag and drop to sort data in report

Question

Hello!
I found a good description to sort data in a Tabular Form per drag and drop.

Answer 1

Here is the url: Read Article - Drag & Drop tabular form rows
It works fine if one follow the hint from Baki (For apex 4.2 one have to adapt a css class).
Afterwards I tried the same with an Interactive Report. It nearly works.
I once again had to adapt a css class.
I used the
apexir_WORKSHEET_DATA
class instead of the
uReportStandard
in the JavaScript for the Interactive Report.
Everything went fine. Except the "Save the Thing to the DB" issiu did not work.
The following code do not work (the "APEX_APPLICATION.G_FROWID.COUNT" is allways 0):
FOR i IN 1 .. APEX_APPLICATION.G_FROWID.COUNT 
LOOP
UPDATE emp SET sort_order = i WHERE rowid = APEX_APPLICATION.G_FROWID(i);
END LOOP;
Does anybody know why?
Best thanks,
Ilb