Add option to control PDF filenames when users download print results through browser preview

Hello When I try to print a pdf in base64 format the document title does not work.

let opt = {
            "printable": data,
            "type": "pdf",
            "documentTitle": "Test Base64",
            "base64": true
}
printJS(opt);

Thanks for sharing this amazing tool.

[crabbly]

Got it. That’s what I thought. Currently, the lib won’t use the document title for this. Also, keep in mind that the main purpose for this library is to print. It just happens that users are now trying to download the print results using their browser (the lib doesn’t manage downloads, it dispatch print jobs). Firefox for example doesn’t even show a preview, therefore, if users are going to primarily download the PDFs, I would recommend just giving them a download button on top of the print button.

That said, here is how we print the base64 data: https://github.com/crabbly/Print.js/blob/master/src/js/pdf.js#L48

The lib creates a local blob and url, then it sets the iframe src with that url. If the browser (or OS) gives the user an option to save the print job as PDF, it will use the auto generated id / filename in the url. If we could find a way to control this, we could possibly pass the documentTitle string to it and it may work.

I’ll try to play with this whenever I have a chance. It would be nice if we could add this feature to the lib. A PR is welcomed 😃

[yannanna0920]

2022年了 这个问题要不要改了