setFieldValue

Commits a value to a field the way a viewer does when the reader leaves it: the keystroke script sees the whole value, then validate, then the value is stored, then every calculate script runs in the form's own order, then the format scripts decide what is shown (ISO 32000-1 §12.6.3 for the triggers and §12.7.2 for the calculation order).

Returns false when a script refused the value, in which case nothing was stored.