Datepicker start, and end_date not persistent when set from callback.

[vegovs]

I have a callback that sets the datepickers start- and end_date to today. When I refresh the site the dates change to the previous manually selected dates. I.e the dates set by the callback are not persistent.

dash                      1.19.0
dash-bootstrap-components 0.11.3
dash-core-components      1.15.0
dash-extensions           0.0.46
dash-html-components      1.1.2
dash-renderer             1.9.0
dash-table                4.11.2

• if frontend related, tell us your Browser, Version and OS

  • OS: [Ubuntu 20.0]
  • Browser [chrome]
  • Version [22]

Describe the bug

As described above. Dates set manually by a user are persistent, but dates set by callbacks are not.

Datepicker:

datepicker = dcc.DatePickerRange(
    id='datepicker',
    start_date=date.today(),
    end_date=date.today(),
    start_date_placeholder_text='Fra',
    end_date_placeholder_text='Til',
    initial_visible_month=datetime.now(),
    first_day_of_week=1,
    minimum_nights=0,
    persistence=True,
    persistence_type='session',
    persisted_props=['start_date', 'end_date'],
    with_portal=True,
    show_outside_days=True,
),

Callback:

@app.callback(
    [Output('datepicker', 'start_date'),
     Output('datepicker', 'end_date')],
    Input('today_button', 'n_clicks'),
)
def set_datepicker_today(n):
    return [date.today(), date.today()] if n else dash.no_update

[gvwilson]

Hi - we are tidying up stale issues and PRs in Plotly's public repositories so that we can focus on things that are most important to our community. If this issue is still a concern, please add a comment letting us know what recent version of our software you've checked it with so that I can reopen it and add it to our backlog. (Please note that we will give priority to reports that include a short reproducible example.) If you'd like to submit a PR, we'd be happy to prioritize a review, and if it's a request for tech support, please post in our community forum. Thank you - @gvwilson

[ndrezn]

Reopening as there is an open PR related to this issue.

[arc12]

Also seems (callback changes not persisted bur manual are) to affect the single date picker. Is there a workaround? Which is the open PR referred to in the last comment