Note

• When the user loads a specific PDF file in Adobe Reader and then opens it in Firefox, scrolls it and compares the multiple drop-down elements between each other, he will notice that Adobe will show available options for each, while Firefox will only show options for some of them.

Affected versions

• Nightly v92.0a1

Affected platforms

• all

Steps to reproduce

1. Launch browser.
2. Flip "pdfjs.enableXfa" to true.
3. Load the attached PDF file.
4. Open multiple drop-down elements.

Expected result

• All drop-down elements have available options to choose from.

Actual result

• Most of the drop-down elements have no available options to choose from.

Regression range

• Not a regression.

Additional Information

• I cannot determine whether this issue is blocking one or the other bug. Please remove the one that isn't being blocked.

Calixte, can you check if this is dynamic?

It's a binding issue.
For example the field "Sex" has an element bindItems and it isn't handled correctly.
It's likely a regression due to:
https://github.com/mozilla/pdf.js/commit/112645ea3dd4bcb13e08579f9971918bcd7e0ed7

Before this patch we were reaching:
https://github.com/mozilla/pdf.js/blob/683ce66a48cd54fa48e96e1925277c134859e76c/src/core/xfa/bind.js#L638

and so Binder::_bindItems was correctly called.

Calixte, was that patch included in the recent pdf.js update we uplifted to beta last week? Thanks

This patch is included in https://bugzilla.mozilla.org/show_bug.cgi?id=1722352.

The fix is verified in Beta v91.0b98 and Nightly v92.0a1 from 2021-07-30.