A user asked a question in an email, that I thought might be of interest to other users, so I'm posting it and my reply here:
I am also interested in making Moodle work with Parsons problems. There is a ready made library to do this under the MIT license (here). I was wondering if it would be easy for a question prototype to eschew the ACE editor and load it up as a parsons problem instead. The running could then be done by grabbing the code from the DOM when the submit button is clicked or perhaps just hiding the ACE editor and updating it each time there is a drag and drop. Does that sound reasonable? I could make a Moodle plugin instead – but that would mean learning lots more than I want to about Moodle question types!
CodeRunner supports several different UI plugins - Ace is just the default. See here. The appropriate one for your needs is the HTML UI. As a quick partial proof of concept I created a new Python3 question, customised it to use the HTML UI, and copied all the Parsons code including library scripts and CSS into the global extra field. The result is a question that looks like this:
I attach its xml export
It works in the sense that you can construct a solution, click Get feedback, and be told if it's right or not. But it doesn't work with CodeRunner, i.e. clicking Check doesn't work!
I think, though, that you might be better off starting again (but still using HTML UI) rather than trying to use the supplied code. The vast majority of the code in the Parsons github repo is irrelevant in a CodeRunner context.
Further down the line you'd want a question prototype where the bulk of the code was in a template parameter - see this discussion.
This is really interesting; I use Parson's Problems a lot in my instruction of younger students when learning Python and it would be great to be able to include them in Moodle quizzes. I was looking at the other moodle question types to see if it could be done, but did not find anything satisfactory...
As I have only been using CodeRunner for a day at this point, I feel a complete rewrite of a question type is somewhat beyond me at the minute!