Show and Tell - Server Side Caching

Emil · July 6, 2021, 10:01am

Up-to-date examples are available in the examples folder on github, e.g.

thedirtyfew/dash-extensions/blob/master/examples/callback_serverside_output.py

import time
import dash_core_components as dcc
import dash_html_components as html
import plotly.express as px
from dash_extensions.enrich import Dash, Output, Input, State, ServersideOutput

app = Dash(prevent_initial_callbacks=True)
app.layout = html.Div([
    html.Button("Query data", id="btn"), dcc.Dropdown(id="dd"), dcc.Graph(id="graph"),
    dcc.Loading(dcc.Store(id='store'), fullscreen=True, type="dot")
])


@app.callback(ServersideOutput("store", "data"), Input("btn", "n_clicks"))
def query_data(n_clicks):
    time.sleep(1)
    return px.data.gapminder()  # no JSON serialization here


@app.callback(Input("store", "data"), Output("dd", "options"))

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Show and Tell - Server Side Caching

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