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[BUG] Error loading dependencies - app.callback #906
Description
Describe your context
Small app breaks with @app.callback().
dash 0.39.0
dash-core-components 0.38.0
dash-html-components 0.13.2
dash-renderer 0.15.0
dash-table 4.2.0
- OS: 5.2.9-arch1-1-ARCH
- Browser: Firefox | Chromium
- Version 69.0-1 | 76.0.3809.132-1
Ad blockers disabled.
Describe the bug
The following app gives "Error loading dependencies". The error disappears when the callback is commented out.
import dash
import dash_core_components as dcc
import dash_html_components as html
from dash.dependencies import Input, Output
app = dash.Dash(__name__)
app.layout = html.Div([
dcc.Input(id='my-id', value='initial value', type='text'),
html.Div(id='my-div')
])
@app.callback(
Output(component_id='my-div', component_property='children'),
[Input(component_id='my-id', component_property='value')]
)
def update_output_div(input_value):
return 'You\'ve entered "{}"'.format(input_value)
if __name__ == '__main__':
app.run_server(debug=True)
Expected behavior
I have seen similar issues, but unfortunately not been able to resolve it.
Activity
byronz commentedon Sep 4, 2019
@MBertolino thanks for the report, I cannot reproduce this on my local environment.
Can you first try to upgrade dash to 1.2.x? If the problem still presents, most likely relates to the Arch Linux, then I will try to reproduce it with the exact environment.
btw, which python version are you on? thanks
MBertolino commentedon Sep 4, 2019
Thank you @byronz for your swift reply. I use python 3.7.4
I have now retried with updating the following
and it works. I originally installed dash via Arch User Repository, and bluntly assumed it was up-to-date, but turns out it wasn't. It is not an issue on your side but hopefully some stray Arch users may find this useful.
Thank you!
Bump plotly.js v1.58.3 (plotly#906)
Bump plotly.js v1.58.3 (#906)