The /Ff field flags of a choice field (ISO 32000-1 Table 230), alongside the
three every field carries (Table 226).
Fields
:read_only— the field may not be changed by the user.:required— the field must have a value when the form is submitted.:no_export— the field is omitted from a submission.:combo— the field is a combo box rather than a list box. This is the bitPdfElixide.Form.Field.Choice's:kindreports as:combo_box.:edit— the combo box includes an editable text box, so its value need not be one of the offered options. Meaningful only with:combo.:sort— the options are sorted alphabetically. This is a hint to the software that produces the field, not to the one that displays it.:multi_select— more than one option may be selected at once, which is how a choice field comes to hold a list value.:do_not_spell_check— an editable combo box's text is not spell-checked.:commit_on_sel_change— the new value is committed as soon as a selection is made, rather than when the field loses focus.:raw— the undecoded/Ffinteger, for bits this struct does not name.
See the "Field kinds and flags" section of the Forms guide.