visualize not working when remotely accessing notebook

[drpventura]

I am trying to determine if visualize only works through Jupyter when you are using a browser from the local machine.

I am trying to setup an instance in Google Cloud of CourseAnalytics with Julia and Jupyter running. However, whenever I try to run the visualize command it spins for a while and then produces a gray box saying "localhost refused to connect" (see screenshot below).

I also tried setting up in an Ubuntu guest in VirtualBox. When I try to connect from within the Ubuntu instance (to itself) visualize works. However, when I try to connect to the Ubuntu (host) server from my Windows (guest), I get the same message as above about not being able to connect. Is this by design or is it an error? Note: I have run using WebIO and ``WebIO.install_jupyter_nbextension()` before running notebook.

[haydenfree]

Hi Dr. Ventura, we've been working to make the Jupyter Notebook experience more reliable but I don't think we've come across this bug before. I've previously set up Jupyter running on an Amazon EC2 instance and visualized plans without problem, but it's possible something has broken since then.

Jiacheng has been focused on the Jupyter side of things so I am going to include him on this issue.

@jiachengzhang1 Have you run into this issue? Any ideas on what may be causing it?

[jiachengzhang1]

Yeah, this is because there's no a server for port 8156 set up to render the embedded visualization html page to notebook when using cloud server.

you could resolve it by setting the url from this

CurricularAnalytics.jl/src/Visualization.jl

Line 15 in b90412c

local_embed_url = string("http://localhost:", LOCAL_EMBED_PORT)

to the src url from the template.

CurricularAnalytics.jl/src/visualization-template.html

Line 19 in b90412c

<iframe id="curriculum" src="http://curricula-api-embed.damoursystems.com/"></iframe>

You may go to the Julia package directory to change the url for testing(If you install Julia for an user, on ec2 is /home/<user>/.julia/packages/CurricularAnalytics/<some string>/src/Visualization.jl. Haven't tried on Google Cloud yet, but it should be similar)

@haydenfree Do you think if we need to change the embedded url in the repo?

[drpventura]

That fixed it. Thanks!