0

Pythontutor, a code Visualizer is integrated within CloudCoder (an open source web-based programming exercise system). When I click on the Visualize button (to the left of the green bar in the screenshot below), only a blank window pops up. The visualizer doesn't show up with the code under question.

CloudCoder

This problem seems specific to all browsers (Chrome, Firefox and Opera) running on Windows 7 on a PC (I don't know if it works okay on Windows 8).

PythonTutor

To re-create the problem, click on this demo problem available at this URL (userid: guest password: password). Any ideas on how to get the Visualizer to work within the browser?

lifebalance
  • 1,846
  • 3
  • 25
  • 57
  • The link provided requires a login. Running python tutor from the first link works ok in chrome on Windows 8. Can you confirm if this works on windows 7 ok (As in is it just a problem when you use cloud coder). – MrDobilina Nov 06 '15 at 16:43
  • Yes, the visualizer window does not launch from within CloudCoder. Here's the login details: userid: `guest` password: `password` – lifebalance Nov 06 '15 at 16:45

1 Answers1

2

It's usually a good idea to check the dev console when anything goes wrong:

insecure content error

The message above is self-explanatory, but unfortunately pythontutor.com does not seem to support HTTPS (it responds, but with a "Forbidden" error page).
You should contact them and kindly ask them to upgrade, if you care about security.
In the mean time, see this question & answer for how to work around security:
How to allow http content within an iframe on a https site

(The problem isn't specific to Windows btw, I'm running OS X 10.10.5 with Chrome 48 dev.)

An entirely different approach in this particular case would be to simply get the PythonTutor source code and host it yourself.

Siguza
  • 21,155
  • 6
  • 52
  • 89