Populating fields based on list box values

Question

I have created an application based off of a table and so the 1st page is the actual report and the 2nd page is the data entry form. I have changed the form elements (like text box to select list) etc.
I need to have (2) text box fields populated based on the value from the 2nd select list box. I created a pl/sql page process that will check the value of the select list and assign values to the text boxes. This is triggered when a POPULATE button is pressed.
When I select a truck number in the select list - nothing happens and the original select list values get reset back to original. There is another button used in order to insert the data so that's why I figured I needed to add another button to trigger the population of the text boxes from a table. Here is my pl/sql page process used to populate:
BEGIN
SELECT dr1_name, dr2_name
INTO
:P2_DRIVER_1, :P2_DRIVER_2
FROM
active_drivers a
WHERE
:P2_DRIVER_CODE = a.code;
END;
It is set to fire on submit - before computations and validations.
Regards,
Jeff

Answer 1

Not sure if this is the best way but it works for me……
Make P2_DRIVER_CODE be a form element of Select List with Submit
Create 2 items, P2_DRVR1 and P2_DRVR2, of form element Hidden
Edit the P2_DRIVER_1 item. In the source region enter :P2_DRVR1 in Post Calculation Computation.
Edit the P2_DRIVER_2 item. In the source region enter :P2_DRVR2 in Post Calculation Computation.
Create a page rendering computation for item: P2_DRVR1.
Type: SQL Query
Computation Point: Before Header
Computation: SELECT dr1_name FROM active_drivers a WHERE a.code = :P2_DRIVER_CODE
Create a page rendering computation for item: P2_DRVR2.
Type: SQL Query
Computation Point: Before Header
Computation: SELECT dr2_name FROM active_drivers a WHERE a.code = :P2_DRIVER_CODE
When an item is selected in P2_DRIVER_CODE the page will submit/refresh, causing the computations to be fired. P2_DRIVER_1 and P2_DRIVER_2 will be populated by the return of the queries in the computations respectively.
P2_DRIVER_1 and P2_DRIVER_2 are still editable by the user (unless you define them as read only) but if you have another select list with submit on the form, if used, the page will refresh and the computation will run again overwriting what the user has entered.
Suppose I want the user to be able to change the defaults and keep from losing them (changed back to default) in case another item submits/refreshes the page.
Create a hidden item P2_DRIVER_CODE_CHANGE with the source of: Static Text. For the Default Value enter &P2_DRIVER_CODE. (include the period after &P2_DRIVER_CODE)
Edit the P2_DRVR1 and P2_DRVR2 computations and in the Conditional Computations region set:
Condition Type: Text in Expression 1 != Expression 2 (include &ITEM substitutions)
Expression1: &P2_DRIVER_CODE.
Expression2: &P2_DRIVER_CODE_CHANGE.
Hope this works for you,
Jeff