html to pdf including MathJax transformation - pdf-generation

Question

How do I create a pdf with html (DOM) content accounting for the css styles of html?
HTML has MathJax javascript rendered formulae in it. I would like the pdf to show the formulae as they are visible in browser using MathJax.
Also, HTML contains few images.
Which open source java library helps to create such a pdf from html content?
I looked into Apache PdfBox but did not find a solution.
Solution has to be open source library to be used in commercial application.
EDIT
DOM content is dynamic generated on server side and not pushed to browser.
FlyingSaucer is close to what I need. However this does not support java script i.e html with MathJax can not be (properly) converted to pdf.

Answer 1

There are various PDF renderers based on WebKit that support JavaScript. The best I've found is the screen capture feature of PhantomJS.
http://phantomjs.org/screen-capture.html
You'll have to write a bit of code though, and make sure you don't take the screen grab until the JS has finished doing its thing.
Update
Here's a really simple example that reads HTML from stdin and saves a PDF file to disk:
// render.js
var page = new WebPage();
page.content = require("system").stdin.read();
setTimeout( function(){
page.render( 'export.pdf' );
phantom.exit(0);
}, 100 ); // <- wait for JS
You can execute this from whatever server-side runtime you're using, as long as it can execute a shell. To test it from the command line with a static file, you can do:
~/bin/phantomjs render.js < sample.html