Access Cookie In Serve Layout Function

@jwillis0720 wrote:

Hello everyone,

I am trying to initally populate a dropdown in my layout with a cookie. If a user has populated the dropdown with 20 items from their last visit, I would like them to be able to pickup where they left off. I am storing my cookies in the callback context as specified here.

@app.callback(Output('dropdown_container', 'value'),
             [Input('someothercomponent', 'clickData')])
def update_dropdown(clickData):
   #do something
   dash.callback_context.response.set_cookie(
            'mycookie', pickle.dumps(values)) 
   return values
       

I also have a dynamically loaded layout on refresh.

def get_dropdown():
    ...setup options from data...

    dd = dcc.Dropdown(
        id='dropdown_container',
        options=countries+provinces+state+counties,
        value=['worldwide', 'COUNTRY_US:NONE', 'STATE_New York:US'],
        multi=True,
        style={'position': 'relative', 'zIndex': '3', 'font-size': '75%'}
    )
    return dd

def serve_dash_layout():
    return html.Div(id='root-container', children=get_dropdown())


server = flask.Flask(__name__)
app = dash.Dash(server=server,
                meta_tags=get_meta())
app.layout = layouts.serve_dash_layout

Because the function get_dropdown() which is under serve_dash_layout creates the initial dropdown default values, I was wondering if it could have access to the mycookie that I setup in the callback the nexttime the user comes to my app. What global variables does serve_dash_layout have access to?

Thanks so much,
J

Posts: 1

Participants: 1

Read full topic