Validate Date Input

Hi,
I have 2 input date (date_created and date completed). The date_created column is mandatory but date completed is not.
If I enter a value on the date_completed column I want it to be validated against the date_create column.
in PL/SQL I can do it like this:
IF date_completed < date_created THEN
DBMS_OUTPUT.PUT_LINE('Invalid Input!');
END IF
How can I do it in HTML-DB where the user will be prompted of an error message? In which part (item, region)?
Appreciate any help...

Roman,
To do this in HTML DB, you create a validation. Validation error message can be displayed both inline with fields and in designated areas for user notifications.
It may be helpful to study our comprehensive tutorial. It cover adding validations to your application on page 20.
http://www.oracle.com/technology/products/database/htmldb/tutorials.html
Sergio

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