SECTION 8.6
689
Interactive Forms
most one button in the on state at any given time; selecting any of the buttons au-
tomatically deselects all the others.
Note:
An exception occurs when multiple radio buttons in a field have the same on
state and the RadiosInUnison flag is set. In that case, turning on one of the buttons
turns on all of them.
The field type is
Btn
, the Pushbutton flag (see Table 8.75 on page 686) is clear, and
the Radio flag is set. This type of button field has an additional flag, NoToggle-
ToOff, which specifies, if set, that exactly one of the radio buttons must be select-
ed at all times. In this case, clicking the currently selected button has no effect; if
the NoToggleToOff flag is clear, clicking the selected button deselects it, leaving
no button selected.
The
Kids
entry in the radio button field’s field dictionary (see Table 8.69 on page
the set. The parent field’s
V
entry holds a name object corresponding to the ap-
pearance state of whichever child field is currently in the on state; the default val-
ue for this entry is
Off
buttons.
Example 8.17
10 0 obj
<< /FT /Btn
/Ff …
/T ( Credit card )
/V /MasterCard
/Kids [ 11 0 R
12 0 R
]
>>
endobj
11 0 obj
<< /Parent 10 0 R
/AS /MasterCard
/AP << /N << /MasterCard 8 0 R
/Off 9 0 R
>>
>>
>>
endobj
% Radio button field
% … Radio flag = 1, Pushbutton = 0 …
% First radio button