TextField AcroForm does not render multiline text properly

[ST-1580]

Similar question I found in StackOverflow

Also this issue is reproduced in your live demo:

[ST-1580]

How can we pass multiline text?

[tsv2013]

The thing is that until you are not editing text you actually see not the text field but it appearance object. This appearance is calculated via the calculateAppearanceStream function (https://github.com/parallax/jsPDF/blob/master/src/modules/acroform.js#L168-L203). Mutli-line text should be inserted here https://github.com/parallax/jsPDF/blob/master/src/modules/acroform.js#L194 . And calculated in this function - https://github.com/parallax/jsPDF/blob/master/src/modules/acroform.js#L205-L364 - calculateX. The calculateX function splits form field text by spaces - https://github.com/parallax/jsPDF/blob/master/src/modules/acroform.js#L219 - and then word by word tries to fit text into
given paper width. Thus the calculateX function doesn't support multiline text separated by \n completely.

We'll try to implement the fix and make pull request to the original repo - https://github.com/parallax/jsPDF
@HackbrettXXX is it ok for you?

[HackbrettXXX]

@tsv2013 Yes, a pull request would be very welcome.

[ST-1580]

Hello @HackbrettXXX, @tsv2013

We've fixed this issue via the commit above. Also we've added one simple test. Please, contact me if there are some questions about this fix

[tsv2013]

@HackbrettXXX Could you check it please?

[ST-1580]

Hello @HackbrettXXX,

All checks have passed. Can you merge PR?

[Uzlopak]

Made two remarks regarding the use of let and const instead of var. We can not risk breaking older browsers.

[ST-1580]

@Uzlopak, @HackbrettXXX, I've done needed changes. I will be very pleasant if you run tests and merge PR please as fast as you can

[Uzlopak]

I started the tests. But I wont merge it as HackbrettXXX is the main maintainer