Setting values for items other than default value

Question

How can I set the value of Items (hidden item, display item etc) without using any of navigational control such as list, select list or tree?
I have a two report region on a page and no navigation control. the requirement is only one region should be displayed at one point of time.
Condition that drives this are passed from other page through links.
The code is like this
For Region A
select * from table a where cola = :P_VALUE_FROM_OTHER_PAGE; //value passed is JOE
For Region B
select * from table a where cola = :P_VALUE_FROM_OTHER_PAGE; //value passed is JOHNnow there is the hidden item :P_HIDDEN that i am comparing in expression1 = expression2 conditions for each region
for e.g.
for region A
value in expression1 = expression2
P_HIDDEN = 1
for region B
P_HIDDEN = 2my issue is, where can I set values for P_HIDDEN item (set to 1 and set to 2) without any navigational control on the page.
Thanks,
R
now there is the hidden item :P_HIDDEN that i am comparing in expression1 = expression2 conditions for each region
for e.g.
for region A
value in expression1 = expression2
P_HIDDEN = 1
for region B
P_HIDDEN = 2
my issue is, where can I set values for P_HIDDEN item (set to 1 and set to 2) without any navigational control on the page.
Thanks,
R
Edited by: Rich V on May 21, 2010 10:41 PM

Answer 1

The question I would ask is:
How are you determining which region you want to be displayed by default?
Either way, you could potentially use a 'before header' computation to calculate the value of your hidden item, although you'd also need to include some sort of conditional means of preventing the computation from running everytime to run the page (otherwise you'd never see your other region) e.g. you might only want it to run if the hidden item is null.