Create custom CSS to use in popupTable

css_generator.R

library(leaflet)
library(leafpop)

## using a custom css to style the table
className = "my-popup"

css = list(
  "background" = "#ff00ff"
)

css = list(css)
names(css) = sprintf("table.%s", className)

evenodd = list("#ffff00", "#00ffff")
names(evenodd) = rep("background", 2)

evenodd = lapply(evenodd, function(i) {
  list("background" = i)
})

names(evenodd) = c(
  sprintf("table.%s tr:nth-child(even)", className)
  , sprintf("table.%s tr:nth-child(odd)", className)
)

lst = append(css, evenodd)

jnk = Map(function(...) do.call(htmltools::css, ...), lst)

dir = tempfile()
dir.create(dir)
fl = file.path(dir, "myCSS.css")

cat(
  sprintf(
    "%s{ \n  %s\n}\n\n"
    , names(jnk)
    , jnk
  )
  , sep = ""
  , file = fl
)

mymap = leaflet() %>%
  addTiles() %>%
  addCircleMarkers(data = breweries91,
                   popup = popupTable(breweries91, className = className))

addMyCSSDependency = function() {
  list(
    htmltools::htmlDependency(
      name = "mycss"
      , version = "0.0.1"
      , src = dir
      , stylesheet = basename(fl)
    )
  )
}

mymap$dependencies = c(
  mymap$dependencies
  , addMyCSSDependency()
)

mymap