Faceting visualizations

[joshuaclausen]

What problem does this feature solve?

I can't seem to find any eChart that provides a "chart repeat" visualization, also known as a faceted visualization. I'm sure there are other terms for this.

By "repeat options" I mean specifying a dimension that results in the chart being repeated for each of the values found in that dimension. Each of those repeated charts is simply filtered by a single value of the dimension. This would allow you to quickly see, e.g. count over time by product and then how that looks for each region. If you had 5 regions, then you would have 5 charts, each showing the count over time by product in each of those regions. Then you could easily swap out region for "customer age group" to see a different view of things.

This kind of visualization is really valuable, and I expect it will see a lot of use.

What does the proposed API look like?

Tableau does faceting really well.

The Observable Plot library has this feature:
https://observablehq.com/plot/features/facets

eCharts4R has something:
https://echarts4r.john-coene.com/reference/e_facet

The Seaborn Python visualization library has this:
https://seaborn.pydata.org/generated/seaborn.FacetGrid.html

[Ovilia]

You can use multiple grid and xAxis and yAxis to do this in ECharts. See the example.