Using themes makes the tooltips go transparent gray

[Alik-V]

Hi John,

Thanks again for working on the package! I think I found a bug when trying to use tooltips together with themes:

  data.frame(
    x = 1:10,
    y = runif(10, 5, 10)
  ) %>%
    e_charts(x) %>%
    e_line(y, symbol = 'none') %>%
    e_theme("inspired") %>% # same for "infographic" theme, haven't tried others
    e_tooltip(trigger = "axis", formatter = e_tooltip_pointer_formatter(digits = 1))

This results in a gray-transparent tooltips that are hard to read:

[JohnCoene]

I thought it must be a bug but it seems echarts.js changed the default background color of
the tooltip to this: bit ugly. See here

library(echarts4r)

data.frame(
  x = 1:10,
  y = runif(10, 5, 10)
) |> 
  e_charts(x) |> 
  e_line(y, symbol = 'none') |> 
  e_theme("inspired") |>  # same for "infographic" theme, haven't tried others
  e_tooltip(
    trigger = "axis", 
    formatter = e_tooltip_pointer_formatter(digits = 1),
    backgroundColor = "rgba(255,255,255,0.7)"
  )

You can use any valid HTML color, e.g.: rgba() to add use transparency (as done above), rgb(255,255,255), hex #ffffff or valid names black.
Plenty more options are available here.

[Alik-V]

Thanks for the swift reply!
It is pretty ugly now, wonder what their reasoning was...
This solves the issue and thank you for this information. Hope you have a good evening!