Minimal R/Shiny Interface to ECharts.js

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Use Case 6 - Grouped, stacked and timelined

Here is a good example of the data-driven nature of ECharts.
With chart data well built, the actual chart display is trivial. It is like having a painting already drawn and framed, all that’s needed is a nail and hammer to put it on the wall. One may think of echarty as the nail - a final step before display.
A few noticeable details

library(echarty);  library(dplyr)
# data made by vituri (
vv = iris |> mutate(Year= rep(2020:2022, 50)) |> 
  tidyr::pivot_longer(cols= Sepal.Length:Petal.Width) |> 
  group_by(Year, Species, name) |> 
  summarise(value= sum(value))
# rearrange columns for axes: X = Species (1st), Y = value (2nd)
vv <- vv |> relocate(Species, value) |> mutate(Species= as.character(Species))
options <-  lapply(vv |> group_by(Year) |> group_split(), function(y) {
  series <- lapply(y |> group_by(name) |> group_split(), function(s) {
     list(type = 'bar', stack = 'grp', data =,'values'))
  list(title= list(text= unique(y$Year), top= 30), series= series)

vv |> group_by(name) |> ec.init(
	timeline= list(data= unique(vv$Year), axisType= 'category'),
	options= options

stacked bars