Button Widget Annotations
provide user interactivity on a
page of a PDF document. There are three types of buttons available:
push button, radio button, and checkbox. Depending on the type of
button there are different values that may be defined:
The button’s caption. Available only for push buttons. This is the text displayed in the button.
The field name. Available to all button styles.
The selected value. This is the string that is
associated with the selected state of a radio button or checkbox
control. This text is not shown to the user, but is important when
retrieving information on submitted forms. The off state text is
always off
.
For check boxes, to have the buttons behave independently they each need a unique field name.
For groups of radio buttons, each individual button in the group should have the same field name as the others, but a different selected value. This is required for the group of radio buttons to work correctly as a unit.
Push button annotations ignore their selected value They can perform actions when clicked. You can choose the action from the choices available in the push button annotation inspector. (Double click the annotation to bring up the inspector. See screen shot below.)
