The application I’m developing loads data in from a third-party database, and I’m looking to setup a loading icon that displays whilst data is downloaded. However, this requires using a function that both returns in a regular, Pythonic way (once data has been downloaded), and outputs a loading callb…

@matt-buckley , Here, try this: import time import dash from dash import html, dcc from dash.long_callback import DiskcacheLongCallbackManager from dash.dependencies import Input, Output ## Diskcache import diskcache cache = diskcache.Cache("./cache") long_callback_manager = DiskcacheLongCallbackM…

Hello @matt-buckley , Do you have any code that you can post in order to expound on the second part? You can display a loading spinner with this: https://dash.plotly.com/dash-core-components/loading This works by updating children of the spinner in the callback, so it will display any time you ar…

Sure, just as a pseudo-code example what I’m looking for is a simple function like this def import_data(key): return import_data_from_database(key) that, until it returns, results in a loading icon being displayed in a particular area of the screen. However, in order to use the Loading spinner…

For the import_data, you can make your callback have two outputs. The first is where you want the data to be displayed, and the second would be the (‘loading-icon’, ‘children’). You can return whatever you wish, this will make it update and no longer be there. @app.callback( Output(yourdataloc…

The challenge I have is the data will not be displayed directly on the dashboard, but put through further processing before being displayed in a graph. Given the dataset is too large to be stored in a dcc.Store component, is there any other way to return it to a function?

You dont need to return the data, if you are going to be managing the data on the backend, just return to the loading-icon children or ‘’ to let the user know that the data has been loaded successfully. Is the variable (data) being stored as something on the server side?

Function with Loading Callback still Returning Regularly

Dash Python

matt-buckley October 4, 2022, 4:57pm 7

Yes it will be stored as something like a DataFrame, and processed on the server side too which is the challenge, before being displayed as a graph.

Include Alerts in a long calculation

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Function with Loading Callback still Returning Regularly

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