Oracle JHeadstart Developer's Guide - Downloads - Oracle

When you have selected a row in the LOV, and the LOV window is closed, the
returnListener method returnedFromLov() is executed. This method calls method
copyReturnValues() in the same bean class (LovItemBean), which reads the
returnValues property, and copies back the values.
When you have checked the Use LOV For Validation? checkbox on the item’s List of
Values element in the Application Definition Editor, the valueChangeListener and
autoSubmit properties are generated, like in the above example. These two properties
cause the page to be submitted when the user tabs out the LOV item after changing the
value, and JSF calls the valueChangeListener method validateWithLov(). This method
uses the SearchBean of the LOV page (provided through the lovSearchBean managed
property) to execute a query against the LOV ViewObject Usage. When the query returns
exactly one row, validation is successful and the copyReturnValues() method is called
to copy back the values. When zero or more than one row is returned by the query, the
LOV window is launched.
Reference: See the Javadoc or source of LovItemBean.
JHeadstart Developer’s Guide Generating User Interface Widgets 6- 21