How to clear items after a new SelectList item chosen...

Question

Environment: APEX 3.1.1.00.09 on AIX 5.3
Question 1: I have a SelectList with Submit that lets the user select a builder, in this case, and then the user enters other information about that builder like address, and contact information.
After the page is committed and the user wants to go back and change to a different builder I'd like to be able to clear the other items when that new builder is selected since that information will have to change.
I can't seem to see how to trigger a process on a different value being selected in the SelectList drop-down.
Question 2: Is there a way to force a COMMIT when a user clicks on a tab other than the one they're currently on? Again, I couldn't see how to trigger a process based on a tab being clicked.
Any help is greatly appreciated.
-gary

Answer 1

OK - I've just set up a quick test that had a form on page 2 and another page on page 3. When I open page 2 and then click on the tab for page 3, I have the following debug messages:
0.12: Session State: Save form items and p_arg_values
0.13: ...Session State: Save Item "P2_EMPNO" newValue="" "escape_on_input="N"
0.13: ...Session State: Save Item "P2_ENAME" newValue="" "escape_on_input="N"
0.13: ...Session State: Save Item "P2_JOB" newValue="" "escape_on_input="N"
0.13: ...Session State: Save Item "P2_MGR" newValue="" "escape_on_input="N"
0.14: ...Session State: Save Item "P2_HIREDATE" newValue="" "escape_on_input="N"
0.14: ...Session State: Save Item "P2_SAL" newValue="" "escape_on_input="N"
0.14: ...Session State: Save Item "P2_COMM" newValue="" "escape_on_input="N"
0.14: ...Session State: Save Item "P2_DEPTNO" newValue="" "escape_on_input="N"
0.14: ...Session State: Save Item "P2_EMP_YN" newValue="" "escape_on_input="N"
0.15: ...Session State: Save Item "P2_PHONE1" newValue="" "escape_on_input="N"
0.15: ...Session State: Save Item "P2_PHONE2" newValue="" "escape_on_input="N"
0.15: ...Session State: Save Item "P2_END_DATE" newValue="" "escape_on_input="N"
0.15: ...Session State: Save Item "P2_START_DATE" newValue="" "escape_on_input="N"
0.15: ...Session State: Save Item "P2_DEPTNO_MULTI" newValue="" "escape_on_input="N"
0.15: ...Session State: Save Item "P2_TEST_ID" newValue="" "escape_on_input="N"
0.16: ...Session State: Save Item "P2_PRIMARY_EMPLOYEE" newValue="" "escape_on_input="N"
0.16: Processing point: ON_SUBMIT_BEFORE_COMPUTATION
0.16: Branch point: BEFORE_COMPUTATION
0.16: Computation point: AFTER_SUBMIT
0.16: Tabs: Perform Branching for Tab Requests
0.03:
0.03: S H O W: application="33330" page="3" workspace="" request="" session="2218079982129787"
So, the data IS being saved before the tab branching is performed.
Andy