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[BUG] dcc.Upload does not support re-upload the same file.

See original GitHub issue

It appears that if one uses the dcc.Upload.contents property for triggering callback, it fails when the user tries to upload the same file again, due to the content is the same.

I would imagine that a property similar to n_clicks should be provided to trigger callback on each upload event.

Versions:

dash                      1.12.0
dash-core-components      1.10.0
dash-html-components      1.0.3
dash-renderer             1.4.1

Issue Analytics

State:
Created 3 years ago
Reactions:1
Comments:9 (4 by maintainers)

Top GitHub Comments

1reaction

alexcjohnsoncommented, Jan 17, 2022

@noxthot I’m not really sure why the contributor of #859 closed that PR, it does seem like that solution would work though requiring users to add an extra input upload_timestamp to their callbacks just to cover this edge case is a little awkward, I’d rather we try and find a solution that doesn’t require that. Regardless, at this point the PR would need to be recreated in the main dash repo as the dash-core-components repo is no longer used.

0reactions

JonThomcommented, Feb 8, 2022

In the meantime, a workaround is to simply use a callback to replace the upload component after reading its contents.