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Vega extension not loading in subdirectory #7047

malramsay64 opened this issue Aug 19, 2019 · 3 comments · Fixed by #7098

Vega extension not loading in subdirectory #7047

malramsay64 opened this issue Aug 19, 2019 · 3 comments · Fixed by #7098


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@malramsay64 malramsay64 commented Aug 19, 2019


When inside a subdirectory the paths to a Vega file don't include the directory parts of the path of the current notebook. That is the download path is


instead of


for a notebook in the test directory.

The change occurred in #7022 (and #7031) where the baseURL parameter was removed from the loader.

See also #7017


  • Create a directory test
  • Inside the test directory create a new notebook with the contents
import altair as alt
import pandas as pd
df = pd.DataFrame({"x": [1,2,3], "y": [1,2,3]})
alt.Chart(df).mark_line().encode(x="x", y="y")
  • The chart will contain no data, a 404 error message in the terminal and the debug console.

This works in the top level directory.

Expected behavior

The chart loads the data from the directory test as per previous versions of jupyterlab, like 1.0.2.


  • Operating System and version: Fedora 30
  • Browser and version: Firefox 68
  • JupyterLab version: 1.0.6
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malramsay64 added a commit to malramsay64/jupyterlab that referenced this issue Aug 19, 2019
This ensures that the path of the current notebook is included in the
URL for data files in the vega extensions.
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@RickWalker RickWalker commented Aug 27, 2019

We have this problem too, and it comes up in other cases - if you use a custom transformer to put all the json files from Altair in their own folder, then charts don't work. Pretty sure it's the same root cause.

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@jasongrout jasongrout commented Aug 27, 2019

I think this is fixed in #7098. If one of you can test it, that would be great!

@jasongrout jasongrout added this to the 1.1 milestone Aug 27, 2019
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@malramsay64 malramsay64 commented Aug 27, 2019

It is working in my testing. Thank you for the fix!

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3 participants