fdf_set_javascript_action

(PHP 4 >= 4.0.2, PHP 5, PHP 7)

fdf_set_javascript_action — Sets an javascript action of a field

fdf_set_javascript_action ( resource $fdf_document , string $fieldname , int $trigger , string $script ) : bool

Sets a javascript action for the given field.

fdf_document: The FDF document handle, returned by fdf_create(), fdf_open() or fdf_open_string().
fieldname: Name of the FDF field, as a string.
trigger
script

成功时返回 TRUE，或者在失败时返回 FALSE。