Multiple Select List does not Refresh with Dynamic Action

Question

All,
Scenario:
Using APEX 4.2.2, I have a Select List page item (P4_SPONSOR) set to allow multiple values which has a dynamic LOV to populate the list.  What I would like to do is highlight the display values based on another page item's value (P4_DRIVER_ID).  When I set the source of P4_SPONSOR to static text, such as a delimited string of 1:2:3:4, any display values where the return values are equal to the static text are highlighted when the page loads.
Problem:
The problem lies in trying to use a query as a source for P4_SPONSOR which is filtered based on the other page item, P4_DRIVER_ID.  For instance, my SQL Query (returning colon separated values) returns the same as the static text noted above.  In the query's WHERE clause, I specify that the driver's ID is equal to P4_DRIVER_ID:
SELECT sponsor_id
FROM sponsors_drivers_xref
WHERE driver_id = :P4_DRIVER_ID;
This, as I understand it, would necessitate a refresh of P4_SPONSOR whenever the value of P4_DRIVER_ID changes.  So, I have a Dynamic Action that does just that.  When executed on the page, I can see the P4_SPONSOR multiple select list actually refresh, but none of the display values become highlighted.
Thoughts?
Thanks,
-Seth.

Answer 1

Seth,
A dynamic action refresh of your select list will refresh the list of values (this is what you are seeing), it will not refresh the value of the item itself.  In fact, it will remove any values that you had already selected.  To refresh the value you will need to add additional dynamic actions.
Create another dynamic action with:
Event: After Refresh
Selection Type: Item(s)
Item(s): P4_SPONSOR
If this was a normal select list you could just create a Set Value action and use your query to set the value of the select list.  Since this is a multiple select list your will need to get your colon delimited value first and then use some javascript to set the values of your select list.
Create an hidden page item name P4_SPONSOR_TEMP.
Add a true action to your new dynamic action:
Action: Set Value
Set Type: SQL Statement
SQL Statement:
SELECT sponsor_id
FROM sponsors_drivers_xref
WHERE driver_id = :P4_DRIVER_ID;
Page Items to Submit: P4_DRIVER_ID
Selection Type: Item(s)
Item(s): P4_SPONSOR_TEMP
Add another true action to your new dynamic action:
Action: Set Value
Set Type: JavaScript Expression
JavaScript Expression:
$("#P4_SPONSOR_TEMP").val().split(":")
Selection Type: Item(s)
Item(s): P4_SPONSOR
--Jeff