Set font size of form field, for text to fit box?

[yaakovyitzchak]

BH


I'm trying to make a basic application that allows users to automatically fill in the form fields of a PDF based on input data [i.e., a CSV with the form values]. Since it should be filling in lots of fields automatically, without knowing what the content of each field would be, I would like to have a way to set the font size of each text field to be such that all of the text will fit within the field [the input PDF already has the form created and everything].

Any way to do this?

I'm using fontkit, for example, the function that sets the fields is the following [srcDoc is the PDFLib document with built in fields]:

var foynt = srcDoc.font

if(foynt) {
var fm = rdoc.getForm()
var nonRich = fm.getFields()
	.map(q=> [
		q.getName(), 
		(() => {
			try {
				return q.getText()
			} catch(e) {
				return ""	
			}
		})()
	])

nonRich.forEach(q=> {
	var fl = fm.getField(q[0])
	fl.setFontSize(18) //this is the part that I would like to be dynamic
           //to determine what the number is somehow
	fl.setText(q[1])
})

var nf = fm.getFields()
	.map(q=>[q.getName(),q.getText()])



flatasize(fm, foynt)

fm.flatten()
}"

"flatasize" is a function based on another thread here to proerly update the fields:

function flatasize(fm, foynt) {
	var rupdation = fm.updateFieldAppearances.bind(fm)
	fm.updateFieldAppearances = () => {
		return rupdation(foynt)
	}
}

when I embed the font in the PDF earlier, the code is:

pdf.doc.registerFontkit(fontkit); //global variable of the fontkit library found elsewhere on github

pdf.doc.embedFont(bites) //"bites" is the bites of the ttf file loaded earlier
.then(r => {
	fonts.push({
		id:fontID,
		embedded: r,
		name: font.name,
		srcDocID: pdf.id
	})
	
	pdf.font = r

the rest of my code is secret for my project so I would prefer not to upload it, but I have to upload something to post
BH.txt