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The simplest type of eld is a pushbutton eld, which has a eld type of Btn and the Pushbutton ag (see Table 853) set Because this type of button retains no permanent value, it does not use the V and DV entries in the eld dictionary (see Table 849 on page 531)
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A checkbox eld toggles between two states, on and off, when manipulated by the user with the mouse or keyboard Its eld type is Btn and its Pushbutton and Radio ags (see Table 853) are both clear Each state can have a separate appearance, de ned by an appearance stream in the appearance dictionary of the eld s widget annotation (see Section 844, Appearance Streams ) The V entry in the eld dictionary (see Table 849 on page 531) holds a name object representing the checkbox s appearance state, which is used to select the appropriate appearance from the appearance dictionary The appearance for the off state is optional, but if present must be stored in the appearance dictionary under the name Off The recommended name for the on state is Yes, but this is not required Example 89 shows a typical checkbox de nition
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Example 89 1 0 obj << /FT /Btn /T (Urgent) /V /Yes /AS /Yes /AP << /N << /Yes 2 0 R >> >> >> endobj 2 0 obj << /Resources 20 0 R /Length 104 >>
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stream q 0 0 1 rg BT /ZaDb 12 Tf 0 0 Td (8) Tj ET Q endstream endobj
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Because they are limited to the Latin character set, name objects cannot be used to represent the values of checkbox elds in non-Latin writing systems To address this problem, PDF 14 provides an additional, optional entry, Opt, in the eld dictionary for checkbox elds (see Table 854) When present, this entry holds a human-readable text string to be used in place of the V entry to denote the value of the eld This allows the use of Unicode encoding to specify eld values using non-Latin characters
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TABLE 854 Additional entry speci c to a checkbox eld
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(Optional; inheritable; PDF 14) A text string to be used in place of the V entry for the value of the eld
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A radio button eld is a set of related toggle controls, at most one of which may be on at any given time; selecting any one of the buttons automatically deselects all the others The eld type is Btn, the Pushbutton ag (see Table 853 on page 538) is clear, and the Radio ag is set This type of button eld has an additional ag, NoToggleToOff, which speci es, if set, that exactly one of the radio buttons must be selected at all times In this case, clicking the currently selected button has no effect; if the NoToggleToOff ag is clear, clicking the selected button deselects it, leaving no button selected
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The Kids entry in the radio button eld s eld dictionary (see Table 849 on page 531) holds an array of widget annotations representing the individual buttons in the set, each of which is a separate checkbox eld in its own right The parent eld s V entry holds a name object corresponding to the appearance state of whichever child eld is currently in the on state; the default value for this entry is Off Example 810 shows the object de nitions for a set of radio buttons
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Example 810 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 12 0 obj << /Parent 10 0 R /AS /Off /AP << /N << /Visa 8 0 R /Off 9 0 R >> >> >> endobj 8 0 obj << /Resources 20 0 R /Length 104 >> % Radio button eld % Radio ag = 1, Pushbutton = 0