App callback without an output

calendar_today August 19, 2026 person @AnnMarieW domain plotly

This is an old post, but it’s still popular, so I wanted to make sure anyone who finds it through a search gets the current answer. Callbacks with no outputs have been supported since Dash 2.17: dash.plotly.com Callbacks with No Outputs - Advanced Callbacks

Dash for Python Documentation

… In this case, prevent_initial_call will prevent the update_output() callback from firing when its input is first inserted into the app layout as a result of the display_page() callback.

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App callback without an output