Defining a Field-Level Trigger to React to Value Changes

Field-level triggers are scripts that you can write to complement the default processing logic for a standard or custom field. The following field-level trigger is available:

• After Field Changed

  Fires when the value of the related field has changed (implying that it has passed any field-level validation rules that might be present).

Use the After Field Changed trigger to calculate other derived field values when another field changes value. Do not use a field-level validation rule to achieve this purpose because while your field-level validation rule may succeed, other field-level validation rules may fail and stop the field's value from actually being changed. Since generally you only want your field-change derivation logic to run when the field's value actually changes, the After Field Changed trigger guarantees that you get this desired behavior.

See Deriving Values of a Field When Other Fields Change Value for tips on using this trigger.