Я пытаюсь обновить карту, когда некоторые данные были загружены, нажав кнопку «Создать карту». Затем обратный вызов должен запустить функцию "udate_figure", но она не работает.
layout = html.Div([
html.Div(html.H3('Map')),
html.Div(dcc.Upload(
id='upload-data',
children=html.Div([
'Drag and Drop or ',
html.A('Select Files')
]),
style={
'width': '100%',
'height': '60px',
'lineHeight': '60px',
'borderWidth': '1px',
'borderStyle': 'dashed',
'borderRadius': '5px',
'textAlign': 'center',
'margin': '10px'
},
# Allow multiple files to be uploaded
multiple=True
)),
html.Div(dcc.Graph(id='my-graph')),
html.Button('Generate map', id='button'),
html.Div(id='output-data-upload'),
])
df_ = pd.DataFrame()
def parse_contents(contents, filename, date):
content_type, content_string = contents.split(',')
global df_
decoded = base64.b64decode(content_string)
try:
if 'csv' in filename:
# Assume that the user uploaded a CSV file
df_ = pd.read_csv(
io.StringIO(decoded.decode('utf-8')))
elif 'xls' in filename:
# Assume that the user uploaded an excel file
df_ = pd.read_excel(io.BytesIO(decoded))
except Exception as e:
print(e)
return html.Div([
'There was an error processing this file.'
])
return html.Div([
html.H5(filename),
html.H6(datetime.datetime.fromtimestamp(date)),
dash_table.DataTable(
data=df_.to_dict('records'),
columns=[{'name': i, 'id': i} for i in df_.columns]
),
html.Hr(), # horizontal line
# For debugging, display the raw contents provided by the web browser
html.Div('Raw Content'),
html.Pre(contents[0:200] + '...', style={
'whiteSpace': 'pre-wrap',
'wordBreak': 'break-all'
})
])
@app.callback(Output('output-data-upload', 'children'),
[Input('upload-data', 'contents')],
[State('upload-data', 'filename'),
State('upload-data', 'last_modified')])
def update_output(list_of_contents, list_of_names, list_of_dates):
if list_of_contents is not None:
children = [
parse_contents(c, n, d) for c, n, d in
zip(list_of_contents, list_of_names, list_of_dates)]
update_figure()
return children
@app.callback(
Output('my-graph', 'children'),
[Input('button', 'n_clicks')])
def update_figure():
trace = []
trace.append(
go.Scattermapbox(lat=df_["lat"], lon=df_["long"], mode='markers', marker=go.scattermapbox.Marker(
size=14), hoverinfo='text'))
return {"data": trace,
"layout": go.Layout(autosize=True, hovermode='closest', showlegend=False, height=700,
mapbox={'accesstoken': mapbox_access_token, 'bearing': 0,
'center': {'lat': 38, 'lon': -94}, 'pitch': 30, 'zoom': 3,
"style": 'mapbox://styles/mapbox/light-v9'})}
Помимо того, что кнопка работает, вызывается update_figure - можно ли будет удалить кнопку и затем обновить карту, когда файл будет загружен сразу же .?