突出显示选择项目指向的R小叶多边形（不点击它）

Question

在R闪亮的应用程序，是否有可能有一个传单地图突出显示选择项目指向的多边形（它应该只是移动列表上方的mouss而不点击它）？

在下面的可再现示例中，我希望这个Shiny应用程序突出显示与鼠标光标位置对应的多边形，但无需单击它。

library(shiny)
library(shinyjs)
library(leaflet)
library(sf)

download.file(url = "http://thematicmapping.org/downloads/TM_WORLD_BORDERS-0.3.zip", destfile = "TM_WORLD_BORDERS-0.3.zip")
unzip( zipfile = "TM_WORLD_BORDERS-0.3.zip" )

world.borders <-read_sf( dsn = getwd(), layer = "TM_WORLD_BORDERS-0.3" )
world.borders <- world.borders[world.borders$NAME %in% c("Australia","United States","Brazil","Ireland","India","Kenya"),]

server <- function(input, output, session) {

output$mymap <- renderLeaflet({
    leaflet(options = leafletOptions(maxZoom = 18)) %>% addTiles() %>%
       addPolygons( data = world.borders, fill =  "#D24618", color = "blue")
 }) 
}

 ui <- fluidPage(
     leafletOutput("mymap"),
     selectInput(inputId = "country_choice",label = "Select a country",choices = unique(world.borders$NAME))
)

shinyApp(ui, server)

非常感谢 ！

Answer 1

这应该够了吧：

library(shiny)
library(shinyjs)
library(leaflet)
library(sf)

### Note had to download by hand as this did not work
## download.file(url = "http://thematicmapping.org/downloads/TM_WORLD_BORDERS-0.3.zip", 
##               destfile = "TM_WORLD_BORDERS-0.3.zip")
## unzip( zipfile = "TM_WORLD_BORDERS-0.3.zip" )

world.borders <- read_sf( dsn = getwd(), layer = "TM_WORLD_BORDERS-0.3" )
world.borders <- world.borders[world.borders$NAME %in% 
                               c("Australia", "United States", "Brazil", 
                                 "Ireland", "India", "Kenya"), ]

ui <- fluidPage(
  useShinyjs(),
  leafletOutput("mymap"),
  selectInput(inputId = "country_choice",
              label   = "Select a country",
              choices = c("Please Select..." = "", unique(world.borders$NAME)))
)

server <- function(input, output, session) {
runjs(glue::glue("$('.selectize-control').on('mouseenter', ",
                 "'.selectize-dropdown-content div', ",
                 "function() {{",
                 "    Shiny.setInputValue('selected', $(this).data('value'));}}); ",
                 "$('.selectize-control').on('mouseleave', ",
                 "'.selectize-dropdown-content div', ",
                 "function() {{",
                 "    Shiny.setInputValue('selected', null);}})"))

  output$mymap <- renderLeaflet({
    myBorders <- world.borders[world.borders$NAME == input$selected, ]
    leaflet(options = leafletOptions(maxZoom = 18)) %>% addTiles() %>%
      addPolygons(data = myBorders, fill =  "#D24618", color = "blue")
  }) 
}

shinyApp(ui, server)