如果从flask创建并调用Dash应用程序,则Dash回调不起作用
Dash应用程序在创建并通过flask服务器调用时失败。Dash的回调不起作用,发出Post请求400。非常感谢您的帮助 下面是重现该问题的示例代码。我使用最新的Dash 0.22.0、Dash HTML组件0.11.0、Dash核心组件0.24.1和Flask 1.0.2:如果从flask创建并调用Dash应用程序,则Dash回调不起作用,flask,plotly-dash,Flask,Plotly Dash,Dash应用程序在创建并通过flask服务器调用时失败。Dash的回调不起作用,发出Post请求400。非常感谢您的帮助 下面是重现该问题的示例代码。我使用最新的Dash 0.22.0、Dash HTML组件0.11.0、Dash核心组件0.24.1和Flask 1.0.2: # file 'simple_flask.py' from flask import Flask from flask_sqlalchemy import SQLAlchemy from flask_wtf.csrf i
# file 'simple_flask.py'
from flask import Flask
from flask_sqlalchemy import SQLAlchemy
from flask_wtf.csrf import CSRFProtect
# Initialise flask App
app = Flask(__name__, instance_relative_config=True)
#app.config.from_object('config.Config')
db = SQLAlchemy() # SQLAlchemy
csrf_protect = CSRFProtect()
def set_app(app):
# Setup WTForms CSRFProtect
app.secret_key = 'My super secret key'
csrf_protect.init_app(app)
# Setup Flask-SQLAlchemy
db.init_app(app)
# run in app context
with app.test_request_context():
db.create_all()
from simple_dash import create_dash
create_dash(app)
if __name__ == '__main__':
set_app(app)
app.run(host='127.0.0.1', port=5002, debug=True)
## file 'simple_dash.py'
import dash
import dash_html_components as html
import dash_core_components as dcc
def create_dash(app):
dash_app = dash.Dash(__name__, server=app,
#static_folder='/static',
#url_base_pathname='/app/oga/',
# csrf_protect=False
)
dash_app.layout = html.Div([
dcc.Dropdown(
id='my-dropdown',
options=[
{'label': 'New York City', 'value': 'NYC'},
{'label': 'Montreal', 'value': 'MTL'},
{'label': 'San Francisco', 'value': 'SF'}
],
value='NYC'
),
html.Div(id='output-container')
])
@dash_app.callback(
dash.dependencies.Output('output-container', 'children'),
[dash.dependencies.Input('my-dropdown', 'value')])
def update_output(value):
return 'You have selected "{}"'.format(value)
加载页面和下拉列表中任何后续更改后缺少的参考是:“POST/_dash-update-component HTTP/1.1”400。从dash github的@T4rk1n开始,这是CSRFProtect烧瓶扩展和dash之间的冲突。以下显示了如何从CSRFProtect中排除Dash:
csrf\u protect=CSRFProtect()
csrf\u protect.\u emption\u views.add('dash.dash.dispatch')
谢谢您,先生,这个答案是值得的。