Python 带回调的Plotly Dash Live Update引发LayoutInDefined异常
我遵循Dash网站上的指南,在页面刷新时对其进行实时更新:Python 带回调的Plotly Dash Live Update引发LayoutInDefined异常,python,plotly-dash,Python,Plotly Dash,我遵循Dash网站上的指南,在页面刷新时对其进行实时更新: import datetime import dash import dash_html_components as html def serve_layout(): return html.Div([ dcc.Interval(id="time_trigger", interval=1000), html.H1('The time is: ' + str(datetime.datetime.
import datetime
import dash
import dash_html_components as html
def serve_layout():
return html.Div([
dcc.Interval(id="time_trigger", interval=1000),
html.H1('The time is: ' + str(datetime.datetime.now()), id="header")])
app.layout = serve_layout
if __name__ == '__main__':
app.run_server(debug=True)
但是,这确实适用于回调。如果执行以下操作,将引发LayoutSnotDefined:
@app.callback(
Output("header", "children"),
[Input("time_trigger", "n_intervals")]
)
def connect_to_date_sync_service(n_interval):
return "Interval is triggered {} times".format(n_interval)
这是Dash引发的错误:
dash.exceptions.LayoutIsNotDefined:
Attempting to assign a callback to the application but
the `layout` property has not been assigned.
Assign the `layout` property before assigning callbacks.
Alternatively, suppress this warning by setting
`suppress_callback_exceptions=True`
此代码适用于我:
import datetime
import dash
import dash_core_components as dcc
import dash_html_components as html
from dash.dependencies import Input, Output
app = dash.Dash()
def serve_layout():
return html.Div([
dcc.Interval(id="time_trigger", interval=1000),
html.H1('The time is: ' + str(datetime.datetime.now()), id="header")])
app.layout = serve_layout
@app.callback(
Output("header", "children"),
[Input("time_trigger", "n_intervals")]
)
def connect_to_date_sync_service(n_interval):
return "Interval is triggered {} times".format(n_interval)
if __name__ == '__main__':
app.run_server(debug=True)
以下是我用作参考的软件包版本:
# Name Version Build Channel
dash 1.11.0 pyh9f0ad1d_0 conda-forge
dash-bootstrap-components 0.9.2 pyh9f0ad1d_0 conda-forge
dash-core-components 1.9.1 pyh9f0ad1d_0 conda-forge
dash-daq 0.4.0 py_0 conda-forge
dash-html-components 1.0.3 pyh9f0ad1d_0 conda-forge
dash-renderer 1.4.0 pyh9f0ad1d_0 conda-forge
dash-table 4.6.2 pyh9f0ad1d_0 conda-forge
你试过运行
app.run_server(debug=True,dev_tools\u ui=True,dev_tools\u props\u check=True)
,我认为是回调验证导致了问题?dev_tools\u ui和dev_tools\u props\u check都默认为True,因此不需要指定它们