Drop lists / combo boxes break after first save

We’re facing an issue where users cannot choose options from drop lists after a document has been saved using PDF.js Express. This is reproducible in the demo on your website.

Secondly, the red outline around drop lists is not positioned correctly. Drop lists should probably not be outlined in red as it implies ‘required’ to most of our users, despite the fields not being required at all.

To reproduce:

  • Upload Original.pdf into the demo.
  • Choose an option from a drop list field.
  • Save / Download.
  • Reload the demo and upload the newly saved pdf.
  • Try to choose a different option from the same drop list that was used earlier.

Original.pdf (263.2 KB)
Broken.pdf (330.3 KB)

1 Like

Hi Ryan,

Thank you for finding this bug on the demo site.

We’ve added the issue to our backlog to be worked on in the future. We don’t have a timeline for when it will be fixed but if it does get fixed we’ll let you know when it’s available in an experimental build to test out and the estimated official release date. If you have a desired timeline for having this issue fixed please let us know and we’ll do our best to work with you on how this can fit into the release schedule.

Best Regards,
Zach Serviss
Web Development Support Engineer
PDFTron Systems, Inc.


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We need a quick fix on this Zach, we have 100’s of clients that will be affected by this issue!

Hi there,

I will update this in our internal ticket. It will be worked on ASAP.

Best Regards,
Zach Serviss
Web Development Support Engineer
PDFTron Systems, Inc.


Share how you are using PDF.js Express in your organization you could win a $500 Amazon gift card. All participants will receive 6 months of PDF.js Express+ for free. Learn more here