Plotly plots not working in Jupyterlab

When I run this example:

import plotly.graph_objects as go
fig = go.Figure(data=go.Bar(y=[2, 3, 1]))
fig.show()

in a Jupyter notebook under jupyter lab I get no output. The output cell expands as if it is going to show output, but it is just blank. I see this error in the browser console:

VM458:2 Uncaught ReferenceError: require is not defined
    at <anonymous>:2:17
    at t.attachWidget (vendors~main.479571ea0f6c7741ac01.js:2)
    at t.insertWidget (vendors~main.479571ea0f6c7741ac01.js:2)
    at C._insertOutput (vendors~main.479571ea0f6c7741ac01.js:2)
    at C.onModelChanged (vendors~main.479571ea0f6c7741ac01.js:2)
    at m (vendors~main.479571ea0f6c7741ac01.js:2)
    at Object.c [as emit] (vendors~main.479571ea0f6c7741ac01.js:2)
    at e.emit (vendors~main.479571ea0f6c7741ac01.js:2)
    at f._onListChanged (vendors~main.479571ea0f6c7741ac01.js:2)
    at m (vendors~main.479571ea0f6c7741ac01.js:2)

Googling I see others that had that problem had bad installs of extensions, I don’t think I have that:

My jupyterlab + extension versions are:

xbk@30c1f8a93eeb:~/xbk_trade_advisory/code/chquery$ jupyter --version
jupyter core     : 4.6.2
jupyter-notebook : 6.0.3
qtconsole        : 4.7.1
ipython          : 7.12.0
ipykernel        : 5.1.4
jupyter client   : 5.3.4
jupyter lab      : 2.0.1
nbconvert        : 5.6.1
ipywidgets       : 7.5.1
nbformat         : 5.0.4
traitlets        : 4.3.3

xbk@30c1f8a93eeb:~/xbk_trade_advisory/code/chquery$ jupyter labextension list
JupyterLab v2.0.1
Known labextensions:
   app dir: /usr/local/share/jupyter/lab
        @jupyter-widgets/jupyterlab-manager v2.0.0  enabled  OK
        jupyterlab-plotly v4.9.0  enabled  OK
        plotlywidget v4.9.0  enabled  OK

Thanks for any help with this.

Matt

[derekhe]

I managed to make it work in jupyter lab using:

import plotly.io as pio
pio.renderers.default='iframe'

[JanHomann]

I figured out that setting pio.renderers.default to iframe, iframe_connected, or browser works. But not jupyterlab or notebook. When set to notebook an empty space shows up where the plot is supposed to be, when set to jupyterlab, it finishes the computation and nothing happens.