How to populate a filter field in one page with the value from other page

Take the classic report with form application.
on page 1 (report) I have a filter (dbname) for the records that will appear in the report. Say that, I enter "ap02" in the filter and all records where dbname starts with "ap02" will display. It works ok.
Then I click on "create" button and page 2 appears. I enter all fields except the dbname. This field is generated, at "pre-insert trigger on the table".
What I want is when I press the button "create" on page 2 to pass the value of the generated dbname field into the filter in page 1 so when that page refreshes I will have only one record on the report page (1). I understand that the dbname at the page 2 level still empty because it is generated by the trigger. How do I have access to that info to populate the filter.
Thanks for your assistance

Joe - Work backwards from the value generated during the execution of the trigger. You have the value there so you could save it into a package variable right then (create a package with a variable and assign the value to the variable). Then create a process on the page (after the DML process) to assign the value of your package variable to a page item. Then in the branch back to page 1, pass the item. (Or without messing with the branch, the process could simply assign the package variable directly the the page 1 item -- :P1_ITEM := my_package.my_var; ).
An alternative would be to use the "returning into" feature of DML to capture the PK of the created record into an item. Then the next page process could use the PK to fetch the new row and get the dbname value for passing to page 1.
Another option would be to update session state directly in the trigger.
Scott

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Regards,
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Thank you for all your help above.
Just to confirm your advice, am I right with the following conclusions? :
1. The script (function) to fill the text field with the modification date of a different PDF file needs to be stored in a folder level .js file.
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only. After that scope of the variable gets lost
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=====================================
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