Hi,
Im having the same issue for 3 weeks, I cant understand what to do here? I have read all this and tried to solve it but im just not getting it⌠sorryâŚI tried the slap dash project but could not get that to work at all.
I tried taking just the callbacks out of the page files and into my index.py file but obviously you cant do that with the functions that are with those callbacks because the df and needed data for the functions are not in the main app file so that doesnt work⌠it errors for df⌠for exampleâŚ
So when i try to just bring the callback in i get these errors below⌠screen shots⌠about layout and idâsâŚi have different idâs for each callback so that didnt workâŚ
I tried to create a server.py file and put in itâŚapp = dash.Dash(name)⌠and then tried to import that in the pages with from server import app but it wont let me do that⌠just errors lines under server?? Was that the right thing to put in it? how do i import it in all the other files?
My versions:
Dash 1.20.0
Dcc version 1.16.0
im on a macbook pro: catalina, 10.15.5
I have a multi page app, with a basic app.py file as follows:
import dash
import dash_auth
app = dash.Dash(__name__, suppress_callback_exceptions=True,
meta_tags=[{'name': 'viewport',
'content': 'width=device-width, initial-scale=1.0'}],
)
server = app.server
then I have an index.py which is the main page I guess you would call it⌠its as followsâŚ
import dash
import dash_core_components as dcc
import dash_html_components as html
from dash.dependencies import Input, Output
import dash_bootstrap_components as dbc
import pandas as pd
import plotly.express as px
# Connect to main app.py file
from app import app
from app import server
# Connect to your app pages (add pages here from apps file, py files)
from apps import vgames, global_sales, macro, card, esg, nlp, home, live, alpaca, nlpdial, economic, news, socialdata, energy, data
app = dash.Dash(__name__)
app.layout = html.Div([
dcc.Location(id='url', refresh=False),
dbc.NavbarSimple(
children=[
dbc.NavLink("Home", href="/", active="exact"),
dbc.NavLink("About", href="apps/home", active="exact"),
dbc.DropdownMenu(
[dbc.DropdownMenuItem("DEF",
href="apps/vgames", active="exact"),
],
label="Crypto",
nav=True,),
dbc.DropdownMenu(
[dbc.DropdownMenuItem("Port",
href="apps/global_sales", active="exact"),
label="Research",
nav=True,),
dbc.DropdownMenu(
[dbc.DropdownMenuItem("Data Points",
href="apps/macro", active="exact"),
],
label="Mr",
nav=True,),
dbc.DropdownMenu(
[dbc.DropdownMenuItem("NL",
href="apps/nlp", active="exact"),
dbc.DropdownMenuItem("NLS",
href="apps/nlpdial", active="exact"),
dbc.DropdownMenuItem("Calendar",
href="https://www.facebook.com/profile.php?id=100070143875491",
external_link=False,),
],
label="NLP",
nav=True,),
dbc.NavLink("Charts", href="apps/live",
active="exact", external_link=True),
dbc.NavLink("Charts1", href="apps/alpaca",
active="exact", external_link=True),
dbc.NavLink("NEWS",
href="apps/news", active="exact"),
dbc.NavLink("Media Data",
href="apps/socialdata", active="exact"),
dbc.DropdownMenu(
[dbc.DropdownMenuItem("Twitter", "External relative",
href="https://twitter.com/bull_swap",
external_link=True,),
],
label="Links",
nav=True,)
],
brand="Research & Analytics",
color="primary",
dark=True,
),
dbc.Container(id="page-content", className="pt-4"),
@ app.callback(Output(component_id='page-content', component_property='children'),
[Input(component_id='url', component_property='pathname')])
def display_page(pathname):
if pathname == '/apps/vgames':
return vgames.layout
if pathname == '/apps/global_sales':
return global_sales.layout
if pathname == '/apps/macro':
return macro.layout
if pathname == '/apps/card':
return card.layout
if pathname == '/apps/esg':
return esg.layout
if pathname == '/apps/nlp':
return nlp.layout
if pathname == '/apps/home':
return home.layout
if pathname == '/apps/live':
return live.layout
if pathname == '/apps/alpaca':
return alpaca.layout
if pathname == '/apps/nlpdial':
return nlpdial.layout
if pathname == '/apps/economic':
return economic.layout
if pathname == '/apps/news':
return news.layout
if pathname == '/apps/socialdata':
return socialdata.layout
if pathname == '/apps/energy':
return energy.layout
if pathname == '/apps/data':
return data.layout
else:
return home.layout
if __name__ == '__main__':
app.run_server(debug=True)
I cut out a lot of the repeat pages in the drop downs for simplicity here but u can see the structure in the following:
def display_page(pathname):
if pathname == â/apps/vgamesâ:
return vgames.layout
if pathname == â/apps/global_salesâ:
return global_sales.layout
I have multiple pages with callbacks that are supposed to update with data/prices from apiâs but none load the charts⌠only empty charts
this is one of the pages for example⌠live.py.
import pandas as pd
import plotly
import plotly.express as px
from app import app
import dash
import dash_core_components as dcc
import dash_html_components as html
from dash.dependencies import Input, Output
from dash.exceptions import PreventUpdate
import dash_bootstrap_components as dbc
import pandas_datareader.data as web
import datetime
from alpha_vantage.timeseries import TimeSeries
key = 'key_here' # Your API Key
ts = TimeSeries(key, output_format='pandas') # 'pandas' or 'json' or 'csv'
# -------------------------------------------------------------------------------
# (only for example purposes) Pull data from API and prepare it for plotting on line chart
# Get the data, returns a tuple
# ttm_data is a pandas dataframe, ttm_meta_data is a dict
# https://github.com/RomelTorres/alpha_vantage/blob/develop/alpha_vantage/timeseries.py
# tsla_data, tsla_meta_data = ts.get_intraday(
# symbol='TSLA', interval='1min', outputsize='compact')
# print(tsla_meta_data)
# df = tsla_data.copy()
# print(df.head())
# df = df.transpose()
# print(df.head())
# df.rename(index={"1. open": "open", "2. high": "high", "3. low": "low",
# "4. close": "close", "5. volume": "volume"}, inplace=True)
# df = df.reset_index().rename(columns={'index': 'indicator'})
# print(df.head())
# df = pd.melt(df, id_vars=['indicator'], var_name='date', value_name='rate')
# df = df[df['indicator'] != 'volume']
# print(df[:15])
# df.to_csv("data2.csv", index=False)
# exit()
layout = dbc.Container([
dbc.Row([
dcc.Interval(
id='my_interval',
n_intervals=0, # number of times the interval was activated
interval=120*1000, # update every 2 minutes
),
dcc.Graph(id="world_finance"),
], className='mb-15'),
dbc.Row([
dcc.Markdown(children=markdown_text, style={
'textAlign': 'center'}),
], className='fixed-bottom'),
# dcc.Interval(id='update', n_intervals=0, interval=1000*5)
])
@app.callback(
Output(component_id='world_finance', component_property='figure'),
[Input(component_id='my_interval', component_property='n_intervals')]
)
def update_graph(n):
"""Pull financial data from Alpha Vantage and update graph every 2 minutes"""
tsla_data, tsla_meta_data = ts.get_intraday(
symbol='TSLA', interval='1min', outputsize='compact')
df = tsla_data.copy()
df = df.transpose()
df.rename(index={"1. open": "open", "2. high": "high", "3. low": "low",
"4. close": "close", "5. volume": "volume"}, inplace=True)
df = df.reset_index().rename(columns={'index': 'indicator'})
df = pd.melt(df, id_vars=['indicator'],
var_name='date', value_name='rate')
df = df[df['indicator'] != 'volume']
print(df[:15])
line_chart = px.line(
data_frame=df,
x='date',
y='rate',
color='indicator',
title="Stock: {}".format(tsla_meta_data['2. Symbol'])
)
return (line_chart)
I made sure the⌠Input(component_id=âmy_intervalâ .)]⌠id was different for each one of the callbacks i put in the index.py⌠but it still gave me the errors id not found in layout?
Sorry for the long post but i cant figure out how to say this with out all this information.
If the solution is to create new server.py file, can someone say exactly what goes in it? and then if i need to import that file into all the other files? and how?
If the solution is put all the callbacks in the index.py file, where exactly? Is there an explanation as to why it didnt work when i tried before? is there an import i need to do then?
THX
