FileUpload ipywidget returns empty dict

[vidsaat]

Environment data

• VS Code version: 1.61.2
• Jupyter Extension version (available under the Extensions sidebar): v2021.9.1101343141
• Python Extension version (available under the Extensions sidebar): v2021.10.1365161279
• OS (Windows | Mac | Linux distro) and version: Ubuntu 20.04.3 LTS
• Python and/or Anaconda version: Python 3.8.10
• Type of virtual environment used (N/A | venv | virtualenv | conda | ...): virtualenv
• Jupyter server running: Local

Expected behaviour

After choosing a file to upload the next ran cell should return the uploaded file.

Actual behaviour

The upload widget still returns an empty dict after the upload.

Steps to reproduce:

import ipywidgets as widgets
uploader = widgets.FileUpload()

uploader.value.values()

returns: dict_values([])

display(uploader)

returns: visual uploader button
action: choose file and upload

uploader.value.values()

returns: dict_values([])
expected return: dict_values([{'metadata': {'name': '.........}}])

[IanMatthewHuff]

@vidsaat Thanks for the detailed report. I repro the same thing, and that the same code does work correctly in Jupyter notebook classic:

[matifrancois]

Having the same problem here, it doesn't work in vscode but it works in Jupyter notebook classic.

[dd-rrc-ps]

Same problem here. It should be greate if VScode support this function

[JosephAntony1]

Any luck on this?

[DonJayamanne]

@matifrancois @dd-rrc-ps @JosephAntony1
I've tested this at my end and it seems to work as expected. Please could you test this again and let me know if it works or not.

[JosephAntony1]

It worked for me once I started changing the jupyrer config kernel size from 10mb to something more like 1gb

[DonJayamanne]

config kernel size from 10mb to something more like 1gb

Please could you let me know what that setting is.
Thanks

[JosephAntony1]

jupyter-widgets/ipywidgets#2522 (comment)

This is where I got the information from

[DonJayamanne]

Thanks, going to close this issue as fixed.

Solution

ensure to increase the max message size as mentioned here jupyter-widgets/ipywidgets#2522 (comment)

c.NotebookApp.tornado_settings = {"websocket_max_message_size": 100 * 1024 * 1024}

[datalifenyc]

Thanks, going to close this issue as fixed.

Solution

ensure to increase the max message size as mentioned here jupyter-widgets/ipywidgets#2522 (comment)

c.NotebookApp.tornado_settings = {"websocket_max_message_size": 100 * 1024 * 1024}

How do you point Visual Studio Code to the jupyter_notebook_config.py or jupyter_notebook_config.json file?

[ubalklen]

@datalifenyc have you figured out? I have the same question.
Also summoning master wizard @JosephAntony1 to check if he can help us :-)

[epicwhale]

Has anyone figured how do you change that websocket_max_message_size for the VS Code Python kernel I am using here? I am confused how to link up the jupyter notebook config with VS code too...

[wrogner]

Wow, 555 days since this issue was reported.

Cudos to MS for taking so much time and effort to produce a working and stable product (stable it is).