Issue with checkbox on tabular form

Question

Hi (to all my friends in deperate times),
I have a tabular form on a page, which i use for addition of record only. So it always displays me a blank row, which is ready to be inserted after user has filled in data and clicked submit button.
Now I have a checkbox field on this tabular form. Since all the columns i show as null, I also show this checkbox as unchecked when page shows up. Here is the query for the source region of this form:
SELECT null "Client",
null "Currency",
HTMLDB_ITEM.CHECKBOX(40,'YES',null) critical_box,
FROM dual
I have used 'YES' as return value of this checkbox( when user has checked it, else i assume it will be not equal to 'YES').
I have my own update process, which gets fired on click of 'Submit'.
this is my insert clause in this update process:
INSERT INTO table1
(client, currency,critical_level)
values
(APEX_APPLICATION.g_f01(i), APEX_APPLICATION.g_f02(i), decode(APEX_APPLICATION.g_f40(i),'YES','YES','NO')
Now problem is that when i click checkbox and save it, it adds record correctly. But when i dont click checkbox during insertion, at that i get error message that no data found. It should insert 'NO' for 3rd column when checkbox is not clicked.
Please help here. Not sure why its giving no data found error when checkbox on tabular form is unchecked.
Thanks and Regards,
Rave.

Answer 1

Hi,
In the linked thread, the solution was to provide a second, hidden, item that always returned a known value. This item, also created using the APEX_ITEM package, uses the same index number as your checkboxes - so, if your checkboxes use index 40 (to get "f40"), then the hidden item uses 40 as well. This way, we always get at least one value for each row and the last possible value in a row will be known.
So, assume that the hidden item values are "NO", you have 10 rows on the page and the user ticks items 1, 2 and 5. The f40 items submitted would be:
YES:NO:YES:NO:NO:NO:YES:NO:NO:NO:NO:NO:NO
so, there will ALWAYS be 10 "NO" items and the YES item immediately before it will be the checkbox on the same row. So, if we loop through all f40 items, the YES values mean the checkbox and the NO values mean end-of-row - and, if we keep track of the NO values, we know which row we are on.
So, the code to find the data in f01 and f02 relating to the the YES values (the checked checkboxes) would be something like:
DECLARE
vROW NUMBER;
vF01VALUE VARCHAR2(100);
vF02VALUE VARCHAR2(100);
BEGIN
vROW := 1; // current row number
FOR x IN 1..APEX_APPLICATION.G_F40.COUNT
LOOP
  IF APEX_APPLICATION.G_F40(x) = 'NO' THEN
   vROW := vROW + 1; // end of the row, so move to next row
  ELSE
   // found a checkbox, so get related data
   vF01VALUE := APEX_APPLICATION.G_F01(vROW); // f01 item on the same row as the checked item
   vF02VALUE := APEX_APPLICATION.G_F02(vROW); // f02 item on the same row as the checked item
  END IF;
END LOOP;
END;Andy