How to make formcheckbox checked and disabled dynamically?

[LodiLofa]

I have multiple checkboxes now I want to make one of them checked dynamically and it's not clickable using PDFkit.

Here is what I have tried so far.

// create a document and pipe to a blob
var doc = new PDFDocument();
var stream = doc.pipe(blobStream());

doc.initForm();

doc.formCheckbox('checked', 45,50,16,16, {
    backgroundColor: '#fff'
})

// end and display the document in the iframe to the right
doc.end();
stream.on('finish', function() {
  iframe.src = stream.toBlobURL('application/pdf');
});

How can I make this checkbox be checked automatically and make it disabled so that user can not check or uncheck the checkbox?

[rohinthr]

@LodiLofa We can use readonly field by passing readonly true in options. But I don't know how to check the checkbox defaulty. No refers for it.

[natterstefan]

Hi @LodiLofa,
Hi @rohinthr,

did you ever find out how to set checkboxes checked automatically?

Thanks for your help.

[hugo-t-b]

With the above PR making the box checked by default should be possible by setting value and AS in options:

doc.formCheckbox("checkbox", 0, 0, 20, 20, {
  AS: "Yes",
  value: "Yes"
});

I also found an AP entry is required for it to work in some readers (although defining it like this is non-standard):

doc.formCheckbox("checkbox", 0, 0, 20, 20, {
  AS: "Yes",
  value: "Yes",
  AP: { N: { Yes: "" } }
});

This should already partially work with just AS, but there might be some unexpected behavior.