Create Dropdown Callback

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Template request | Bug report | Generate Data Product​
Tags: #dashboard #plotly #dash #naas #asset #analytics #dropdown #callback #bootstrap
Author: Florent Ravenel​
Create a basic dropdown, provide options and a value to dcc.Dropdown in that order.
Reference: https://dash.plotly.com/dash-core-components/dropdown
Input
Import libraries
import os
try:
    import dash
except:
    !pip install dash --user
    import dash
try:
    import dash_bootstrap_components as dbc
except:
    !pip install dash_bootstrap_components --user
    import dash_bootstrap_components as dbcs
from dash import html, Input, Output, State, dcc
Setup Variables
DASH_PORT = 8050
Model
Create dropdown
app = dash.Dash(
    requests_pathname_prefix=f'/user/{os.environ.get("JUPYTERHUB_USER")}/proxy/{DASH_PORT}/',
    external_stylesheets=[dbc.themes.BOOTSTRAP],
    meta_tags=[
        {"name": "viewport", "content": "width=device-width, initial-scale=1.0"}
    ],
)
​
app.layout = html.Div(
    [
        dcc.Dropdown(["NYC", "MTL", "SF"], "NYC", id="demo-dropdown"),
        html.Div(id="dd-output-container"),
    ]
)
​
​
@app.callback(
    Output("dd-output-container", "children"), Input("demo-dropdown", "value")
)
def update_output(value):
    return f"You have selected {value}"
Output
Generate URL and show logs
if __name__ == "__main__":
    app.run_server(proxy=f"http://127.0.0.1:{DASH_PORT}::https://app.naas.ai")

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Last modified 1mo ago