"TypeError: H is not a function" when selecting scatter points

[slishak]

I'm not sure if this is a bug in Dash or Plotly.js, but seeing as I can't reproduce it when saving the figure with plotly.offline.plot, I'll put it here.

Whenever I select scatter points in a Dash app, I've started getting the following error:

It doesn't seem to affect the running of the app, any callbacks are still fired for the selected points.

Simplest example to reproduce:

import dash
import dash_core_components as dcc
import dash_html_components as html
import random

app = dash.Dash()

app.layout = html.Div([
    dcc.Graph(
        id='example-graph',
        figure={
            'data': [
                {
                    'x': [random.random() for _ in range(20)],
                    'y': [random.random() for _ in range(20)],
                    'type': 'scatter',
                    'mode': 'markers'

                }
            ],
            'layout': {
                'dragmode': 'select'
            }
        }
    )
])

if __name__ == '__main__':
    app.run_server(dev_tools_serve_dev_bundles=True)

Versions:

dash==0.41.0
dash-core-components==0.46.0
dash-html-components==0.15.0
dash-renderer==0.22.0
plotly==3.7.1

Also, for some reason I'm not getting the dev bundles when I set dev_tools_serve_dev_bundles=True, so sorry if the stack trace isn't very helpful!

[alexcjohnson]

Yes, this should not affect anything, and will be fixed when we update plotly.js to 1.47.1 or greater - plotly/plotly.js#3755

I doubt we'll make a patch release just for this though, probably we'll wait for 1.48 and include this in the next minor dash release.

[alexcjohnson]

Also re: dev bundles - we haven't included a plotly.js dev bundle, only the production version. I think that makes sense, as plotly.js has its own js-only development workflow that we want to keep independent of dash - before something is declared a plotly.js bug it should be replicated in pure js, ie codepen or similar.

[slishak]

OK, thanks very much! Didn't realise that was the same issue. And understood about the dev bundle, makes sense.

[slishak]

This has been fixed by a plotly.js update.