Altair: Javascript named selection error

[mercyfulace1]

Here's the code:

selection = alt.selection_multi(fields=['Priority'])
print(selection)
color = alt.condition(selection,
                      alt.Color('Priority:N', legend=None, scale=alt.Scale(scheme='category10')),
                      alt.value('lightgray'))
print(color)

chart = alt.Chart(df_in).mark_point().encode(
    x='Acronym',
    y='Incident Open Time:T',
    color=color
)

chart

---

Here's the output:

NamedSelection({
  selector014: SelectionDef({
    fields: ['Priority'],
    type: 'multi'
  })
})
{'condition': {'selection': 'selector014', 'type': 'nominal', 'field': 'Priority', 'legend': None, 'scale': {'scheme': 'category10'}}, 'value': 'lightgray'}
Javascript Error: Cannot find a selection named "selector014"

What am I missing? thanks.

[jheer]

I think you need to include .add_selection(selection) to your chart definition?

[mercyfulace1]

That does work, but would I still do that if I want to use another chart as
a legend? looking at this example in the Altair user guide:

selection = alt.selection_multi(fields=['Origin'])color =
alt.condition(selection,
alt.Color('Origin:N', legend=None),
alt.value('lightgray'))
scatter = alt.Chart(cars).mark_point().encode(
x='Horsepower:Q',
y='Miles_per_Gallon:Q',
color=color,
tooltip='Name:N')
legend = alt.Chart(cars).mark_point().encode(
y=alt.Y('Origin:N', axis=alt.Axis(orient='right')),
color=color).add_selection(
selection)
scatter | legend

On Wed, Apr 10, 2019 at 4:01 PM Jeffrey Heer [e-mail]
wrote:

I think you need to include .add_selection(selection) to your chart
definition?

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[jakevdp]

You should call add_selection() on the chart that you want the selection action to take place on.

[mercyfulace1]

Got it. Thanks.

On Wed, Apr 10, 2019, 6:28 PM Jake Vanderplas [e-mail]
wrote:

You should call add_selection() on the chart that you want the selection
action to take place on.

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