Enhancement request: Checkbox item - Default all checked

Question

When a page item with a display type of Checkbox is used in the WHERE clause of a report region (to show rows only if the corresponding checkbox is checked using the INSTR(item_name,column_name)>0 technique), it is frequently useful to render the page for the first time with all checkboxes checked.
The only way I found to render a checkbox item with all values checked is to specify its "Source" attribute as a PL/SQL function body with
declare
l_retval varchar2(4000);
begin
for rec in (select d,r from <lov_query>) loop
   l_retval := l_retval || ':' || rec.r;
end loop;
return ltrim(l_retval,':');
end;I don't like this solution because the LOV query is specified twice on the item properties page (in the LOV section and in this Source attribute). You need to remember to change it in both places.
I think Apex should have a easier method to declaratively specify that checkbox-based items should be initially rendered with all values checked.
Thanks

Answer 1

Hello Vikas,
Why not using an onLoad JavaScript code to mark your checkboxes?
I was thinking about something similar to the check all checkboxes script, but target it to a specific item, and fired it on load.
If you are using Px_ITEM1 as your checkbox item, the first option will always get the ID of Px_ITEM1_0. Using that, how about something like this:
<script language="JavaScript" type="text/javascript">
<!-- Hide
function markBoxes(pItem){
  var itemId = pItem + '_0';
  var checkboxElm = $x(itemId).parentNode;
  var boxOption = checkboxElm.getElementsByTagName('input');
  for (var i=0; i < boxOption.length; i++) {
    boxOption.checked = true;
// End Hide -->
</script>
This way you can keep only one LOV query, and because the tag name search is limited to one item, only its options will be checked.
Regards,
Arie.