[BUG] dcc.Download cannot download files without UTF-8 encoding.

[enriquemoralesmontero]

I am trying to implement a dash_core_components.Download (Python). I am following the code of this web page step by step: https://dash.plotly.com/dash-core-components/download

The point is that this component does not download elements other than text with UTF-8 encoding. I have seen that on the aforementioned website the test buttons for CSV files, images, Excel...

Could this functionality have been corrupted at some point? It only happens when trying to download files without UTF-8 encoding.

I hope it has been helpfull. Thank you very much for this work.

[alexcjohnson]

Ah good catch - this is actually just #1826

ie if I update the imports in the first example it works:

from dash import Dash, dcc, html, Input, Output
import pandas as pd

app = Dash(__name__)
app.layout = html.Div(
    [
        html.Button("Download CSV", id="btn_csv"),
        dcc.Download(id="download-dataframe-csv"),
    ]
)

df = pd.DataFrame({"a": [1, 2, 3, 4], "b": [2, 1, 5, 6], "c": ["x", "x", "y", "y"]})


@app.callback(
    Output("download-dataframe-csv", "data"),
    Input("btn_csv", "n_clicks"),
    prevent_initial_call=True,
)
def func(n_clicks):
    return dcc.send_data_frame(df.to_csv, "mydf.csv")


if __name__ == "__main__":
    app.run_server(debug=True)