Problem downloading/printing PDF form with values

[Sergiobop]

Describe the bug
I think this is a bug (or i'm doing something wrong?). This worked in previous versions.
https://pdfviewer.net/extended-pdf-viewer/forms

Try to download or print the PDF, the form is empty even though is filled previously

1: The form is filled:

2: Print the PDF using the print button:

3: Download the PDF using the download button:

Version info

• 18

Demo PDF file
Just check the DEMO page, the error is there too

[stephanrauh]

What? Oh no! That's unexpected and annoying!

Confused question: How could this bug slip my (and everybody's) attention after such a long a long beta phase?

[Sergiobop]

Hello @stephanrauh

I have been investigating this error. I'll tell you what I've found out:

• The problem seems to be with the formData object/property
• When you initialize the property with values (or change them), the PDF paints the values correctly, as you can see in the DEMO page
• When you print or download, the values disappear.
• If you try to see the values of the pdf form:
  const formData = await this.pdfService.getFormData();

The "values" of all annotations are empty/undefined even though you passed the formData object with values. (formData is not synced with the annotation values)

• If you update a value "by hand" by typing in the form and print/save again, that value does appear. If you try to see the values of the pdf form again, they are still all empty except that one.

It seems that you have to update and synchronize the PDF form values (annotations) with the formData values.

In the DEMO page (https://pdfviewer.net/extended-pdf-viewer/forms)

1. Update Lucía to Lucías by hand:

2. Print the PDF:

3. Only Lucías is filled correctly while printing/downloading.

I suspect the problem is somewhere in here: https://github.com/stephanrauh/ngx-extended-pdf-viewer/blob/main/projects/ngx-extended-pdf-viewer/src/lib/ngx-form-support.ts

Maybe the setFieldValueAndUpdateAnnotationStorage method? Idk

Thanks

[stephanrauh]

I'm afraid that sounds like an exhausting debugging session. I just wonder what went wrong?

At the moment, I'm very busy. I've put your ticket on the top of my pile of work, but even so, it might take a while until I manage to investigate and to solve the issue. Stay tuned!

[stephanrauh]

I've managed to reproduce the issue. Funny thing is that checkboxes still work.

[stephanrauh]

This seems to be an old bug. I need to back-port the solution to version 17, too.

[stephanrauh]

I've observed a weird side-effect: when printing, the document is still visible in the background, but the fields are cleared (even after applying my bugfix).

[Sergiobop]

This seems to be an old bug. I need to back-port the solution to version 17, too.

Yeah, that's what i was about to say. The bug appeared sometime in version 17. I tried to downgrade and still appeared. Can't say when it started though.

Thank you for working on this