NO viz when using headless renderer with JSON data transformer

When using

alt.renderers.enable('png')  # or alt.renderers.enable('svg') 
alt.data_transformers.enable('json')

The viz is empty in the notebook in jupyterlab. Using default in either renderer or data_transformer behaves correct. Seems something wrong with the utils.headless (not sure)?

[pagpires]

Thanks, that will be great. Right now it can be done via setting an arbitrary number:

alt.data_transformers.register('no_limit', lambda data: alt.pipe(data, alt.limit_rows(max_rows=1000000), alt.to_values))
alt.data_transformers.enable('no_limit')
alt.renderers.enable('svg')

Just one more thing (not very related): the bottom of the guide in data transformers (https://altair-viz.github.io/user_guide/data_transformers.html) it not correct. I think it should be

alt.data_transformers.register('s3', lambda data: pipe(data, sample, to_s3('mybucket'))) # not pipe(sample, to_s3('mybucket'))
alt.data_transformers.enable('s3')

[jakevdp]

Oh, I see… that’s an issue.

As soon as #776 is merged you’ll be able to do

alt.data_transformers.enable('default', max_rows=None)

and it will work.

We should make the headless renderers use that automatically… the max rows error is intended for the live rendering use-case.