Interactive forms: values for checkboxes

[evan-mitchell]

When coming across a recently resolved issue (#6995) of radio buttons not having buttonValues, it helped solve an issue for a project that I am currently working on when it was coming to setting the value attribute on radio inputs.
However, I noticed that buttonValue was still not getting set for checkbox button widgets as well. I am proposing the following fix so that we can properly set value attributes on generated checkbox inputs from Acroform annotations.
Please let me know if I am missing something or if this is actually not an issue.

[timvandermeij]

I have looked into this and this situation does not appear to be possible. Radio buttons are linked, i.e., if one is in the "on" state, the other is/others are in the "off" state. There is a parent object that coordinates which radio button in a set is in the "on" state. Since there is no such link between check boxes as they're singular items (i.e., they hold the V entry themselves instead of a parent object), according to what I read in the PDF specification, this scenario should not happen.

I'm closing this PR because of the above. However, if a PDF file is provided that proves me wrong, I'd be happy to reopen this.

[luckygyaan]

Hi,

I am using PDF JS to integrate Acroforms in our web application and the checkbox values is not rendering. I have downloaded the latest package from git hub. Please assist me with the integration.

[evan-mitchell]

@luckygyaan I had to fork a copy of pdf.js and make the following changes in annotation.js to get this working:
https://github.com/mozilla/pdf.js/pull/8079/files

Best of luck