Use two different y-axis names with e_grid()

Question

I want to have two different y-axis labels for two separate y-axes using echarts4r::e_grid().

Here is the sample data taken from the example here:

df <- data.frame(
  x = 1:20, 
  w = runif(20, 1, 100),
  z = runif(20, 25, 75)
)

Adding name = "w" works:

df |> 
  e_charts(x) |> 
  e_line(w) |> 
  e_line(z, x_index = 1, y_index = 1) |> 
  e_grid(height = "35%") |> 
  e_grid(height = "35%", top = "50%") |> 
  e_y_axis(gridIndex = 1, name = "w") |>
  e_x_axis(gridIndex = 1)

I tried adding another e_y_axis() and specifying gridIndex = 0, but this results in a blank white plot.

df |> 
  e_charts(x) |> 
  e_line(w, x_index = 0, y_index = 0) |> 
  e_line(z, x_index = 1, y_index = 1) |> 
  e_grid(height = "35%") |> 
  e_grid(height = "35%", top = "50%") |> 
  e_y_axis(gridIndex = 1, name = "w") |>
  e_y_axis(gridIndex = 0, name = "z") |>
  e_x_axis(gridIndex = 1)

Answer 1

Sometimes these interactive charting libraries and their documentation drive me crazy. (; Using e_y_axis(index = 1, name = "z") with the index argument seems to work:

set.seed(123)

df <- data.frame(
  x = 1:20, 
  w = runif(20, 1, 100),
  z = runif(20, 25, 75)
)

library(echarts4r)
  
df |> 
  e_charts(x) |> 
  e_line(w) |> 
  e_line(z, x_index = 1, y_index = 1) |> 
  e_grid(height = "35%") |> 
  e_grid(height = "35%", top = "50%") |> 
  e_y_axis(gridIndex = 1, name = "w") |>
  e_y_axis(index = 1, name = "z") |>
  e_x_axis(gridIndex = 1)