Why the initial callback of div does not get triggred??
from dash import Dash
from dash.dependencies import Input, Output, State
import dash_core_components as dcc
import dash_html_components as html
from datetime import datetime
import time
available_indicators = ['Nagpur', 'Mumbai', 'Chennai', 'Delhi', 'Agra', 'Pune']
external_stylesheets = ['https://codepen.io/chriddyp/pen/bWLwgP.css']
app = Dash(__name__, external_stylesheets=external_stylesheets)
def create_pane(n):
filter_options = []
import time
time.sleep(2)
if n != None:
p = n.lower()
for i in available_indicators:
if p[0] in i:
filter_options.append(i)
else:
continue
else:
filter_options = available_indicators
pane = html.Div(children=[
dcc.Dropdown(
id='filter',
options=[{'label': i, 'value': i} for i in filter_options],
value=n
)
])
return pane
app.layout = html.Div(
[
# html.Div(children='Agra', id="temp"),
html.Div(children="hello", id="mock-signal"), #style={'display': 'none'}),
html.Div(children=create_pane(None), id="mock-filterpane"),
html.Div(children=[], id="mock-bullet-chart"),
html.Div(dcc.Loading(debug = True,
fullscreen=True, children=html.Div(children=[], id="mock-revenue-graph"))),
html.Div(children=[], id="mock-revenue-map"),
])
@app.callback(
[
Output("mock-signal", "children"),
Output("mock-filterpane", "children")
],
[Input("filter", "value")],
prevent_initial_call=False)
def first_callback(n):
print("\n\nfirst_callback triggered")
print(n)
dropdown = create_pane(n)
return ['signal', dropdown]
@app.callback(
Output("mock-bullet-chart", "children"),
[
Input("mock-signal", "children"),
# Input("filter", "value")
],
# [State("filter", "value")],
prevent_initial_call=False)
# def bullet_callback(signal, value):
def bullet_callback(value):
print("bullet_callback triggered")
val = "Value for mock-bullet-chart is ->" + str(value)
child = html.H3(val)
return child
@app.callback(
Output("mock-revenue-graph", "children"),
[
# Input("mock-signal", "children"),
Input("filter", "value")
],
# [State("filter", "value")],
prevent_initial_call=False)
# def graph_callback(signal, value):
def graph_callback(value):
print("graph_callback triggered")
import time
time.sleep(2)
val = "Value for mock-revenue-graph is ->" + str(value)
child = html.H3(val)
return child
@app.callback(
Output("mock-revenue-map", "children"),
[
# Input("mock-signal", "children"),
Input("filter", "value")
],
# [State("filter", "value")],
prevent_initial_call=False)
# def map_callback(signal, value):
def map_callback(value):
print("map_callback triggered")
val = "Value for mock-revenue-map is ->" + str(value)
child = html.H3(val)
return child
if __name__ == '__main__':
# layout(app)
app.run_server(debug=True)
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