Uncaught Error: Script error for "@jupyter-widgets/base"

[MariuszJurowicz]

The embedded version of ipyleaflet is broken. It does not work in nbviewer and in the http://jupyter.org/widgets.html
It throws the: Uncaught Error: Script error for "@jupyter-widgets/base", needed by: https://unpkg.com/jupyter-leaflet@*/dist/index.js.

the problem is the module_name that is resolved to @jupyter-widgets/base instead of the jupyter-js-widgets as the ipywidgets are available under the jupyter-js-widgets name by requirejs on nbviewer and http://jupyter.org/widgets.html

[scottdraves]

maybe not jason says:

I think the issue is that page tries to use the most recent version of ipyleaflet (the * in the request indicates it's trying to get the most recent version), but the data has not been updated and is only compatible with a previous version

[jasongrout]

The switch from jupyter-js-widgets to @jupyter-widgets/base happened in ipywidgets 7. nbviewer needs to be upgraded to handle ipywidgets 7 - it's hardcoded at ipywidgets 6. We're tracking that at jupyter/nbviewer#717

For the jupyter.org webpage, it's also hardcoded at ipywidgets 6: https://github.com/jupyter/jupyter.github.io/blob/fae454d82f28cf98ce0d1cc4cd1eec59a4a3fe45/widgets.html#L8. However, the code tries to load the ipywidgets 7 version of ipyleaflet. The quick fix is to only load the ipywidgets 6 version of ipyleaflet. The more permanent fix is to upgrade the website code to use ipywidgets 7.

[jasongrout]

The quick fix is to only load the ipywidgets 6 version of ipyleaflet.

On second thought, it may not be that easy - I think loading the latest version is hardcoded in that embedding javascript. It's probably best to switch it to use ipywidgets 7, using instructions at http://ipywidgets.readthedocs.io/en/stable/migration_guides.html#updating-embedded-widgets and updating the json data file with a version from the latest ipywidgets release.

[jasongrout]

Regardless, though, this is an issue with the Jupyter web page, not ipyleaflet, so I'll open an issue there.

[jasongrout]

I opened jupyter/jupyter.github.io#240 to track the update to the webpage. With those two issues tracking these things, I'll close this one.