![]() This is almost certainly because they rely on JavaScript which isn’t functioning. I’m very grateful to Robert, who kindly pointed me at the US Department of Homeland Security’s USCIS Form I-130, a petition for an alien relative, as a fine example of how PDF forms can get really messy.Įven opened in my free Podofyllin, this form looks as if it’s all going to work out fine, and it uses AcroForms rather than XFA Forms, it would appear, so in theory we should be onto a winner without having to complete it using Adobe Acrobat.Īs you start to complete the form, though, it becomes apparent that boxes which should unlock according to your entered responses, such as that to contain an apartment number, simply don’t work. Unfortunately, non-Adobe apps running on macOS either have no or very limited support by those offering digital signatures, and where they can be used is with Adobe PDF products alone. Methods for issuing and using digital signatures vary according to their vendor, and must be specifically supported by a PDF app for them to be usable. ![]() PDF forms may also require signing using digital signatures, rather than a digital image of a handwritten signature. To the best of my knowledge, built-in support in macOS, in PDFKit and Quartz 2D, doesn’t include any support for XFA Forms. In practice they’re only supported by Adobe products and by third-parties which have licensed XFA from Adobe. Although this is now officially deprecated in the international PDF 2.0 open standard, they are still commonly encountered. The built-in support in macOS, in its PDFKit and Quartz 2D engine, doesn’t include deep support for AcroForms, which are left to third-party apps to implement, although controls are normally rendered correctly and most function fairly well.Īdobe introduced a proprietary form system with its XML Forms Architecture (XFA) back in PDF version 1.5. Support for JavaScript varies between different PDF apps. Values which are entered into a form can be kept in the PDF document itself, or stored in an external file using FDF or XFDF format.ĪcroForms supports a range of controls and entry devices such as text boxes and buttons, and allows the use of JavaScript which can enable sections of the form depending on the user’s responses, for example. PDF, in which the entire document is submitted as the added content becomes part of that document.XML Forms Data Format, XFDF, is a limited implementation of FDF using XML format, and is itself available in several different versions.Forms Data Format, FDF, has an internal structure similar to that of PDF, and is based on a dictionary of objects. ![]()
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