Please support events.

[MarcSkovMadsen]

Panel 0.13 (to be released in weeks) will provide support for events on the Vega pane.

I would like to be able to provide the same on the Panel VegaFusion pane.

I don't know if this is currently possible with VegaFusion or how?

Inspiration

You can find the typescript implementation of the Vega pane here https://github.com/holoviz/panel/blob/master/panel/models/vega.ts

You can find the development version of the Vega pane docs here describing the event api here https://pyviz-dev.github.io/panel/reference/panes/Vega.html

[jonmmease]

By events are you talking about the selection parameter? This is definitely something on the roadmap.

I'd like to explore the design space a little bit here. In particular, with Jupyter Widgets it's possible to define widgets that are not displayed. And so one idea I've thought about is to define widget variants of the alt.Selection objects. These would get live updated and could be write-able as a way to sync selections across Charts.

[MarcSkovMadsen]

I don't know what is possible. But i am thinking about all the normal events like click, mouse Enter, mouse leave, mouse over, selections etc.

I would like the VegaFusion pane to cover minimum the same features and use cases as the Panel Bega pane.

[jonmmease]

I would like the VegaFusion pane to cover minimum the same features and use cases as the Panel Vega pane.

I'm not seeing documentation of where the Panel Vega pane supports "click, mouse Enter, mouse leave, mouse over" events. Am I missing that somewhere in https://pyviz-dev.github.io/panel/reference/panes/Vega.html?

[MarcSkovMadsen]

It is actually in the documentation. https://pyviz-dev.github.io/panel/reference/panes/Vega.html#selections. But it is not very clear unless you run the documentation as a notebook. It also looks like Altair/ Vega has more specific events than click etc. Here is an example of subscribing to the brush event.

Another place to look is probably this PR holoviz/panel#2592.

[MarcSkovMadsen]

See also this discussion. vega/altair#1153