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Every
calculation or script you attach to a form object is associated
with a specific event. An event is defined as a particular
occurrence or action that can change the state of a form and, when
the change of state occurs, automatically invoke a calculation or
script associated with the event. Events occur at various times, from
the beginning of the form rendering process when merging data with
a form design, all the way through to a form filler interacting
with objects on a form in a client application. By applying calculations
and scripts to specific events, you can control every aspect of
how you present form objects, as well as form data, and how the
objects and data respond to form filler interaction.
A single change of state or form filler action may trigger multiple
events. For example, tabbing from the current field to the next
field triggers both the exit event for the current
field and the enter event for the next field. If
the current and next fields are in different subforms, a total of
four events are triggered; namely, exit events
for the current field and subform, and enter events
for the next field and subform. In general, each of the different
categories of form events follow a predictable ordering.
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