how you can programmatically update the content of a selection list,
the AJAX features that allow partial page reloads and the associated visual effects.
Event-handlers are defined in the form definition to update the selection lists and
set
the comment text below the table. This requires only a few lines of server-side JavaScript.
Selection widgets also have a "submit-on-change" attribute set in the form template
so that
changes are considered immediately by the server.
See "carselector_form.xml" and "carselector_template.xml" to see how this is done.