Hello, I have a question about how pdf checkboxes work that I'm hoping someone smarter than me can help explain. I have a PDF, in which I've added checkboxes with an empty "down" appearance stream, but no other appearance streams. The normal appearance stream is absent from these checkboxes.
I've programmatically "checked" the checkboxes using PDFBox, and even though the values are changed in the PDF internally, the PDF viewers that I've used (Preview on macOS and Adobe Acrobat, Google Chrome's built-in viewer) don't show the box as "checked". I'm guessing that it's because I haven't set the appearance stream. Is this correct? Curiously though, the PDF Viewers will "check" the box if I click on them while viewing them. If it is because of the appearance streams, generally speaking, do PDF Viewers have a smart way of handling if an appearance stream is absent? Looking for any guidance / direction. Here are some resources I've already checked out. - https://stackoverflow.com/questions/43343232/how-to-add-a-border-to-a-checkbox-and-make-it-always-visible - https://stackoverflow.com/questions/43604973/creating-a-checkbox-and-printing-it-to-pdf-file-is-not-working-using-pdfbox-1-8/43606762 Thanks in advance! -Jesse
