Cannot remove multiline form field

[jelizarovas]

What were you trying to do?

I am trying to merge pdf documents with form fields. It does not work with forms very well as they become very unstable in the merge document, or disappear. My workaround is to get all of the form data, strip all the form fields, merge all the documents and try to apply the form data back on the merged document. Multiline text fields fail on form.removeField(field)

How did you attempt to do it?

Running node v14.18.3
multiline.pdf

module.exports.removeFormFieldsPDF = async (filePath = './multiline.pdf') => {
  const pdfDoc = await PDFDocument.load(fs.readFileSync(filePath));
  const pages = pdfDoc.getPages();
  const form = pdfDoc.getForm();
  const formFields = form.getFields();
  try {
    for (const field of formFields) {
        form.removeField(field);
    }
  } catch (error) {
    console.log(error);
  }
  //SEEMS TO NOT BE ABLE TO REMOVE Multiline textfields
  fs.writeFileSync("../build/test.pdf", await pdfDoc.save());
};

What actually happened?

Error: Unexpected N type: undefined
    at PDFWidgetAnnotation.PDFAnnotation.getNormalAppearance (C:\dev\apps\pts-forms\node_modules\pdf-lib\cjs\core\annotation\PDFAnnotation.js:60:15)
    at PDFForm.findWidgetAppearanceRef (C:\dev\apps\pts-forms\node_modules\pdf-lib\cjs\api\form\PDFForm.js:608:32) 
    at PDFForm.removeField (C:\dev\apps\pts-forms\node_modules\pdf-lib\cjs\api\form\PDFForm.js:489:34)
    at module.exports.removeFormFieldsPDF (C:\dev\apps\pts-forms\utils\pdf.js:195:14)
(node:13664) UnhandledPromiseRejectionWarning: Error: Expected instance of PDFDict or PDFStream, but got instance of undefined

What did you expect to happen?

Remove multi line text field.

How can we reproduce the issue?

Run multiline.pdf
With my function, and it will produce an error

Version

1.17.1

What environment are you running pdf-lib in?

Node

Checklist

• My report includes a Short, Self Contained, Correct (Compilable) Example.
• I have attached all PDFs, images, and other files needed to run my SSCCE.

Additional Notes

No response

[jelizarovas]

[StepanSS]

i didn't solve the problem with remove multiline form field so i removed all forms with

const form = pdfDoc.getForm();
form flatten();

more details here https://pdf-lib.js.org/docs/api/classes/pdfform#flatten
maybe it will be useful for someone

[enoh-barbu]

I found a solution which might work also for you

while (field.acroField.getWidgets().length) {
    field.acroField.removeWidget(0);
}
form.removeField(field);

[masotrix]

I found a solution which might work also for you

while (field.acroField.getWidgets().length) {
    field.acroField.removeWidget(0);
}
form.removeField(field);

Thanks This allowed me to remove all types of fields

[JandenMa]

I found a solution which might work also for you

while (field.acroField.getWidgets().length) {
    field.acroField.removeWidget(0);
}
form.removeField(field);

Excellent 👍 Thank you!!

[S1lander]

I found a solution which might work also for you

while (field.acroField.getWidgets().length) {
    field.acroField.removeWidget(0);
}
form.removeField(field);

OMG yes! I owe you.