Problem in Navigation from one tab to another

Question

Hi All,
In my forms, I have three tabs. In one tab, i have a set of records displayed(like table) in which all columns are bound to a table. I want to sort the records in the tab based on one column. So i wrote the following code in WHEN-TAB-PAGE-CHANGED trigger in form level. It works fine when i click on the particular tab. But when i try to navigate from one tab to another tab which i want to sort, the records in the tab are not sorted. The buton i used to navigate from one tab to another is tab in key board.
DECLARE
l_order_by VARCHAR2 (70) := '(select code from emp)';
BEGIN
IF (:SYSTEM.tab_new_page) = 'PAGE1' OR :SYSTEM.cursor_block = 'BLOCK1' THEN
SET_BLOCK_PROPERTY ('BLOCK1', order_by, l_order_by);
GO_BLOCK ('BLOCK1');
EXECUTE_QUERY;
END IF;
END;
please help asap.
Thanks,
Gopi.

Answer 1

Gopi,
Based on your sample code, the only data block that you are modifying the sort on is "BLOCK1". Rather than combine all of your logic into the When-Tab-Page-Changed (WTPC) trigger, I suggest you simply use the WTPC trigger to set the cursor to the block associated with the selected tab page and then set your block properties and query your block in the When-New-Block-Instance (WNBI) trigger for each block. For example:
/* Sample When-Tab-Page-Changed trigger */
DECLARE
   tp_nm    VARCHAR2(30);
BEGIN
   tp_nm := :SYSTEM.TAB_NEW_PAGE;
   IF ( tp_nm = 'PAGE1' ) THEN
      Go_Block('BLOCK1');
   ELSIF ( tp_nm = 'PAGE2' ) THEN
      Go_Block('BLOCK2');
   ELSIF ( tp_nm = 'PAGE3' ) THEN
      Go_Block('BLOCK3');
   END IF;
END;Bare in mind, that clicking on a Tab Page does not move the navigation cursor the block associated with the tab page displayed. You must manually perform the navigation as demonstrated above. Now, in your WNBI triggers you would write something like the following:
/* Sample When-New-Block-Instance trigger */
DECLARE
   l_order_by VARCHAR2 (70) := '(select code from emp)';
BEGIN
   SET_BLOCK_PROPERTY ('BLOCK1', order_by, l_order_by);
   EXECUTE_QUERY;
END;You could combine this code into the WTPC trigger if you don't want to seperate the code and orgainze it according to your data blocks. The key, however, is that cursor navigation doesn't occur when you click on a tab, you have to perform the navigation yourself.
Hope this helps,
Craig B-)
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