CODEWITHSUNDEEP
pythonaltair
Nathan Watkins
Nathan Watkins

Reputation: 345

Enable automatic tooltips in Altair 3.0

I noticed the Vega-Lite 3.0.0 release notes mentioned "Tooltips are included by default," and this is true for boxplots in Altair 3.0, but not for other plots like histograms.

When I open my Altair plots in the Vega Editor, I see "mark": {"tooltip": null}} in the config section at the top of the chart definition. If I remove "mark": {"tooltip": null}, tooltips work automatically.

So, instead of this:

{
  "config": {"view": {"width": 400, "height": 300}, "mark": {"tooltip": null}},
  "data": {
    "url": "https://vega.github.io/vega-datasets/data/seattle-temps.csv"
  },
  "mark": "bar",
  "encoding": {
    "x": {"type": "quantitative", "bin": true, "field": "temp"},
    "y": {"type": "quantitative", "aggregate": "count"}
  },
  "$schema": "https://vega.github.io/schema/vega-lite/v3.2.1.json"
}

I would like the Altair output to be like this:

{
  "config": {"view": {"width": 400, "height": 300}},
  "data": {
    "url": "https://vega.github.io/vega-datasets/data/seattle-temps.csv"
  },
  "mark": "bar",
  "encoding": {
    "x": {"type": "quantitative", "bin": true, "field": "temp"},
    "y": {"type": "quantitative", "aggregate": "count"}
  },
  "$schema": "https://vega.github.io/schema/vega-lite/v3.2.1.json"
}

Is there a way to prevent Altair from disabling tooltips?

Upvotes: 1

Views: 772

Answers (1)

jakevdp
jakevdp

Reputation: 86320

We made the choice to disable automatic tooltips because Vega-Lite will disable them in the near future. If you would like to enable default tooltips in a particular chart, you can use, e.g.

alt.Chart(data).mark_point(tooltip=alt.TooltipContent('encoding'))

or

chart.configure_mark(tooltip=alt.TooltipContent('encoding'))

If you want every chart in your session to include that setting, you can create an altair theme that enables this by default. For example:

def tooltips():
  return {'config': {'mark': {'tooltip': {'content': 'encoding'}}}}

alt.themes.register('tooltips', tooltips)
alt.themes.enable('tooltips')

Upvotes: 5

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