Report with Select Lists problem

Question

Hi all,
I have a sql report with this query:
select
'Hello World' Col1,
apex_item.select_list_from_lov_xl(1,'Data 1','TEST_LOV') lov1,
apex_item.select_list_from_lov_xl(1,'Data 2','TEST_LOV') lov2,
apex_item.select_list_from_lov_xl(1,'Data 3','TEST_LOV') lov3,
apex_item.select_list_from_lov_xl(1,'Data 4','TEST_LOV') lov4
from dual
Where TEST_LOV is a LOV that return 400 rows. The problem is that this report gives me an error:
report error:
ORA-06502: PL/SQL: numeric or value error: character string buffer too small
I am able to create a workarround using ajax, but I don't think this is the best way.
Does anyone knows why this happens or any solution??
Thanks,
Alejandro.

Answer 1

Hi,
OK - My page is defined as:
The report is based on the following SQL:
select
"EMPNO",
"EMPNO" EMPNO_DISPLAY,
"ENAME",
"DEPTNO"
from "#OWNER#"."EMP"The DEPTNO column is the one that I need a select list for. I have not used the APEX_ITEM package to handle this, but I expect it could be done that way as well.
On the DEPTNO column, I have the following settings:
Display As: Select List (query based LOV)
Named LOV: -Select Named LOV-
Display Extra Values: Yes
Display Null: Yes
List of values definition: SELECT NULL d, NULL r FROM DUAL
Note that it is important that you use these exact settings.
I have then created a new PL/SQL region on the page below the tabular form. The region should use the "No Template" template to keep it hidden from view. The Region Source is:
DECLARE
vSEP VARCHAR2(1);
BEGIN
vSEP := '';
htp.p('<script type="text/javascript">');
htp.p('var sMaster = new Array(');
FOR c IN (SELECT DNAME d, DEPTNO r FROM DEPT ORDER BY UPPER(DNAME))
LOOP
  htp.p(vSEP || 'new Array (' || c.r|| ',"' || c.d|| '")');
  vSEP := ',';
END LOOP;
htp.p(')');
htp.p('</script>');
END;This defines a hidden select list as a javascript array using the actual values from the DEPT table.
I then have an HTML region underneath that, again using "No Template", that has the following as the Region Source:
<script type="text/javascript">
function updateList(sChild)
var o;
var sChildValue = sChild.value;
sChild.options.length = 0;
o = new Option('-Select-', '');
sChild.options.add(o);
var k;
for (k = 0; k < sMaster.length; k++)
  o = new Option(sMaster[k][1], sMaster[k][0]);
  sChild.options.add(o);
sChild.value = sChildValue;
if (sChild.selectedIndex == -1)
  sChild.selectedIndex = 0;
function updateLists()
var lists = document.getElementsByName("f03");
var k;
var x;
if (lists)
  for (k = 0; k < lists.length; k++)
   updateList(lists[k]);
updateLists();
</script>For this example, you will note that I am refering to "f03" (in the updateLists() function) - my DEPTNO column's SELECT tags have "f03" as their NAME attributes. This may need to be changed for your page.
And that's it!
When the page is loaded, the tabular form is constructed. Due to the settings I've applied to the DEPTNO column, each list will actually consist of a NULL entry and the value on the record (that's due to setting Null/Extra Values to Yes).
Then, a hidden select list is constructed as a javascript array. And, finally, we loop through each of the "f03" items on the page, take a note of the value already there, replace the contents of the dummy select list with the contents of the array and then select the original value again.
Andy