I am developing an application in Dash that processes large datasets from Google Cloud. I got the data transfer to work just fine, however as the download takes a considerable amount of time, users don’t see an update until 20 seconds after triggering a query. I would like to add some visual feedbac…

I have a similar question, altough I see that nobody replies to kaiharuto I perform long calculations of epidemiological data and would like to write on a label in the screen the progress of that calculation, to give the user the information on the time to wait to get the result. Is there a way to…

Hi @annunal , I think dbc.Progress could be your solution, see this: [image] Live Stage Visualization Dash Python Hi I am relatively new to Dash/plotly and currently exploring a possibility to show a live stage visual. To explain with an example, let’s say that I have…

Thanks Eduardo. It can work. I will try it

I wanted to try but in reality I don’t think I can. The progress bar must be updated with callback but in my case I would like to update the progress according to the real time spent by the process inside the long callback. With the progress bar, as it is now, either i estimate the time of the pro…

If you can calculate the advance of your process (from 0 to 100), then you can write that progress in a file and with another callback using dcc.Interval you can take that number from the file and send the value to the dbc.Progress

Clever. Maybe in a cookie then instead of a file. I will try and inform you.

The proposed approach relies on multiple callbacks being executed simultaneously. It you have sufficient workers available, it might work. However, in general I would recommend running the long tasks asynchronously, which would yield a more robust solution.

Hi @Emil I didn’t understand your answer, what do you means with “long tasks asynchronously” Thanks!

I mean that they should be run in a separate process, e.g. using Celery . As far as i remember, that is also what Dash Enterprise does for this kind of use case.

Adding Visual Feedback to Long Callbacks with DB Download in Dash

Dash Python

Eduardo January 10, 2021, 11:38am 3

Hi @annunal ,

I think dbc.Progress could be your solution, see this:

and:

https://dash-bootstrap-components.opensource.faculty.ai/docs/components/progress/

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Adding Visual Feedback to Long Callbacks with DB Download in Dash

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