Sets a submit form action of a field
$fdf_document
$fieldname
$trigger
$script
$flags
Sets a submit form 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
flags
Returns TRUE on success or FALSE on failure.
TRUE
FALSE