I want to create a conditional callback in dash, is it possible?

[dhenke]

Hi!

You could simply use the partial update functionality.

@Marc-Andre

Partial Multi-output

no_update prevents updates for individual outputs:

from dash import Dash, no_update
from dash.dependencies import Input, Output
import dash_html_components as html

app = Dash(__name__)
app.scripts.config.serve_locally = True

app.layout = html.Div([
    html.Button('B', 'btn'),
    html.P('initial1', 'n1'),
    html.P('initial2', 'n2'),
    html.P('initial3', 'n3')
])

@app.callback([Output('n1', 'children'),
                Output('n2', 'children'),
                Output('n3', 'children')],
                [Input('btn', 'n_clicks')])
def show_clicks(n):
    # partial or complete cancelation of updates via no_update
    return [
        no_update if n and n > 4 else n,
        no_update if n and n > 2 else n,
        no_update
    ]

if __name__ == "__main__":
    app.run_server(port=8070)

Hope that helps.