Dash_Create_download_button.ipynb

Kernel: Python 3

Dash - Create download button

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Tags: #dash #button #download #create #python #library

Author: Florent Ravenel

Last update: 2023-06-03 (Created: 2023-06-03)

Description: This notebook will show how to create a download button with Dash.

References:

• Dash Bootstrap Components - Button

• Dash Documentation

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 dbc
from dash import html

Setup Variables

• DASH_PORT: specify a port number for Dash

• download_link: Link to the file to be downloaded

DASH_PORT = 8050
download_link = "https://github.com/jupyter-naas/awesome-notebooks/archive/refs/heads/master.zip"

Model

Initialize Dash app

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 = dash.Dash() if you are not in Naas

Create download button

button = html.Div(
    [
        dbc.Button(
            "Download",
            href=download_link,
            download=download_link,
            external_link=True,
            color="primary",
        ),
    ]
)

app.layout = html.Div(
    [
        button
    ]
)

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")