Long callbacks were developed through Dash Labs. . Plotly Dash Development Tips | Mátyás Budavári - GitHub Pages Long vs. normal callbacks. the Download component; While the snippets module documentation will be . . [Prevent initial callback calls per default](https: . . * setProps is a prop that is automatically supplied * by dash's front-end ("dash-renderer"). . layout = html. To learn how to suppress this behavior, see the documentation for the prevent_initial_call attribute of Dash callbacks. . . . Prevent_initial_callback ineffective - Dash Python - Plotly Community Forum alexcjohnson commented on May 4, 2020 plotly/dash#1228 - to be released in Dash 1.12 @app.callback (prevent_initial_call=True) app.clientside_callback (prevent_initial_call=True) app = Dash (prevent_initial_callbacks=True) (and then setting False in certain callbacks) alexcjohnson mentioned this issue on May 4, 2020 Dash datatable - bar plot when choosing/clicking one value of the table Dash 【问题标题】：Dash - 通过函数回调更改 HTML.iframe 元素(Dash - Change HTML.iframe element via function callback) 【发布时间】：2021-07-12 12:40:53 【问题描述】： 我最近启动了一个 Dash 应用程序，它显示了我通过 HTML.iFrame 显示的预注册 HTML 文件： . In dash: An Interface to the Dash Ecosystem for Authoring Reactive Web Applications. . この機能はバージョン1.13.0（＃1240）で . . I am trying to separate the callback in smaller callbacks to have a better interaction, but it is difficult. Now we come to the special features used with long_callback: running and progress. Using AI to develop anything interesting Using AI to develop anything interesting. #' Add a callback to a Dash app #' #' @param app A dash application created with [`dash_app ()`]. By setting prevent_initial_callback=True you are excluding these callbacks from the initial callback graph and effectively making follow up callbacks the initial ones. I try to investigate, did updare dash, put commands to prevent callbacks from firing as general and for individual callbacks. One small caveat, the callback works without any errors if I change the pattern match from "MATCH" to "ALL", however this will return the values of all the buttons, instead of the button that is clicked. Dash / Plotly draw vrect in graph or change drawn rectangle's height You can now skip this initialization behavior by passing in prevent_initial_call=True to your @app.callback or, if you want to skip this for all of your callbacks, prevent_initial_callbacks=True to app = dash.Dash (__name__, prevent_initial_callbacks=True) There are three main use cases for using this: My best guess is that this is caused by registering the callback after having executed app.run_server(). python - forcing initial callback despite dash.PreventUpdate preventing ... At this time, the sub elements under each Tab () can be regarded as a separate page, so we can click the corresponding tab to enter other tab pages, making our application forms more abundant. Alert - dbc docs - Dash Bootstrap Components