r - 单击 map 后，ObserveEvent 不会打印出图层 ID

Question

我试图通过点击 map 来获取国家信息，但国家名称或 Long/lat 没有打印出来。

任何人都可以在这个问题上启发我吗？

谢谢

该 map 来自自然地球。

library(rgdal)
library(shiny)
library(leaflet)

folder="."
country <- readOGR(dsn = folder, layer = "ne_110m_admin_0_countries", encoding="UTF-8")
country <- spTransform(country, CRS("+proj=longlat +ellps=GRS80"))

ui<-fluidPage(
  leafletOutput('mymap')
)

server <- function(input, output, session){
  # RV<-reactiveValues(Clicks=list())
  output$mymap<- renderLeaflet(
    leaflet() %>%
      addProviderTiles("CartoDB.Positron") %>%
      addPolygons(data = country, layerId= ~ADMIN, fillColor = "red", fillOpacity = 1,  color = "black", 
                  stroke = T,  weight = 1  
      )
  )
  observeEvent(input$map_shape_click, {
    p<- input$map_shape_click 
    print(p$id) # click on map, no response
  }) 
}

shinyApp(ui=ui, server=server)

Answer 1

您的 map 名称是“mymap”而不是“map”。所以你需要更换input$map_shape_click与 input$mymap_shape_click .

library(rgdal)
library(shiny)
library(leaflet)

folder="."
country <- readOGR(dsn = folder, layer = "ne_110m_admin_0_countries", 
encoding="UTF-8")
country <- spTransform(country, CRS("+proj=longlat +ellps=GRS80"))

ui<-fluidPage(
  leafletOutput('mymap')
)

server <- function(input, output, session){
  # RV<-reactiveValues(Clicks=list())
  output$mymap<- renderLeaflet(
    leaflet() %>%
      addProviderTiles("CartoDB.Positron") %>%
      addPolygons(data = country, layerId= ~admin, fillColor = "red", 
fillOpacity = 1,  color = "black", 
                  stroke = T,  weight = 1  
      )
  )
  observeEvent(input$mymap_shape_click, {
    p<- input$mymap_shape_click 
    print(p$id) # click on map, no response
  }) 
}

shinyApp(ui=ui, server=server)