Change LOV based on another field value

Question

I have a need to change the LOV of a page item's select list based on the selection in another page item's select list. So in other words, for a page item that is a select list, I need to use one LOV normally, and a different LOV if the value of a different page item is set to X.
A dynamic action would be useful here (on change where Select List 1 = x), but I don't know how to take the action of changing LOVsfor Select List 2 based on that action.
Thanks in advance!
John

Answer 1

Good question. Here is more detail. 2 page items are involved here - P23_GEAR and P23_GEAR_TYPE. Normally, my SELECT for my LOV for the page item P23_GEAR is:
select distinct gear_code d, gear_code r
from gear_lk
order by 2
IF Page Item P23_GEAR_TYPE = 'S' (selected from a select list) THEN I need to use THIS SQL query for the LOV for P23_GEAR:
select distinct gear_code d, gear_code r
from season_gear_office_lk
where season_code = :P23_SEASON
and field_office_code = :P23_FIELDOFFICE
order by 2
So if Page Item P23_GEAR_TYPE = 3, then I have to use a different query for the P23_GEAR page item. And this one is dependent on 2 other page items.
Where do customers come up with these things?!!!
Thanks,
John