CHAPTER 8
676
Interactive Features
KEY
TYPE
VALUE
V
(various)
(Optional; inheritable)
The field’s value, whose format varies depending on
the field type. See the descriptions of individual field types for further infor-
mation.
(Optional; inheritable)
The default value to which the field reverts when a
reset-form action is executed (see “Reset-Form Actions” on page 707). The
format of this value is the same as that of
V
.
(Optional; PDF 1.2)
An additional-actions dictionary defining the field’s
behavior in response to various trigger events (see Section 8.5.2, “Trigger
AA
entry in an
annotation dictionary (see Section 8.4.1, “Annotation Dictionaries”).
DV
(various)
AA
dictionary
The value of the field dictionary’s
Ff
entry is an unsigned 32-bit integer contain-
ing flags specifying various characteristics of the field. Bit positions within the
flag word are numbered from 1 (low-order) to 32 (high-order). The flags shown
in Table 8.70 are common to all types of fields. Flags that apply only to specific
field types are discussed in the sections describing those types. All undefined flag
bits are reserved and must be set to 0.
TABLE 8.70 Field flags common to all field types
BIT POSITION
NAME
MEANING
1
ReadOnly
If set, the user may not change the value of the field. Any associated widget
annotations will not interact with the user; that is, they will not respond to
mouse clicks or change their appearance in response to mouse motions. This
flag is useful for fields whose values are computed or imported from a data-
base.
If set, the field must have a value at the time it is exported by a submit-form
action (see “Submit-Form Actions” on page 703).
If set, the field must not be exported by a submit-form action (see “Submit-
2
3
Required
NoExport
Field Names
The
T
entry in the field dictionary (see Table 8.69 on page 675) holds a text string
defining the field’s
partial field name.
The
fully qualified field name
is not explicit-
ly defined but is constructed from the partial field names of the field and all of its