Number of records in a block

Question

I have to know if a block has records to enable a button to run a process.
I tried to use something like this:
declare
cnt number := 1;
begin
go_block('my_block');
first_record;
while :system.last_record = 'FALSE'
loop
cnt := cnt + 1;
next_record;
end loop;
:ANOTHER_BLOCK.RECCOUNT := cnt; -- will hold number of records
end;
I put this code in a WHEN-VALIDATE-ITEM trigger to enable the button immediately user type in a record (MY_BLOCK has only one item)
But I get this message: Illegal restricted procedure GO_BLOCK in ...
I removed GO_BLOCK call and get: Illegal restricted procedure NEXT_RECORD in ...
and so on.
May be I have to use another type of code or have to use this code in another trigger to get this effect.
Is there some way to do that? Please some guidance
Thanks in advance
Oscar

Answer 1

One idea:
Create a parameter named "entries" with a default value of 0.
Then create a unvisible non-basetable-item in your multi-record block with same datatype and length like your must-ckeck-item.
At the item you want to check if a value is entered, create a WHEN-NEW-ITEM-INSTANCE trigger:begin
:b_block.unvisible_item := :b_block.your_item_to_check;
end;Create a WHEN-VALIDATE-ITEM trigger on your must check item:
begin
if
  :b_block.unvisible_item is null AND
  :b_block.your_item_to_check is NOT null
then
  :parameter.entries := :parameter.entries + 1;
elsif
  :b_block.unvisible_item is NOT null AND
  :b_block.your_item_to_check is null
then
:parameter.entries := :parameter.entries - 1;
end if;
if
  :parameter.entries > 0
then
  set_item_property ( 'b_your_block.your_mystic_disabled_button', enabled, property_true );
else
  set_item_property ( 'b_your_block.your_mystic_disabled_button', enabled, property_false );
end if;
end;May this will help.
Regards
Stauder