闪亮的传单ploygon点击事件

Question

我有一张名为business的地图，该地图是从自然地球网站下载的。我在这里做的是创建了一个显示地图的基本Map输出。我主要使用两列admin（这是国家的名称）和economy。然后我在ui下添加了一个名为Business的下拉列表，这样当我单击该国家/地区的多边形时，列表将刷新并显示我要点击的国家/地区。我假设当我写p <- input$Map_shape_click闪亮时会知道p是business对象，因此它有admin列，我引用了这个admin ID来刷新我的Business下拉列表。但它不起作用。链接显示了我所看到的内容 - 当我点击其他国家/地区时，列表不会刷新。

server.r

country <- readOGR(dsn = tmp, layer = "ne_110m_admin_0_countries", encoding   = "UTF-8")
business<-country[country@data$admin %in% c("Brazil","Colombia","Panama","Kazakhstan","Argentina","India","","Chile","Dominican Republic","United Kingdom","El Salvador","United States of America"),]
business@data$category <- factor(sample.int(20L, nrow(business@data), FALSE))


shinyServer(function(input, output,session) {

output$Map <- renderLeaflet({
  factpal <- colorFactor(topo.colors(20), business@data$category)
  state_popup <- paste0("<strong>Name of the country </strong>", 
                        business$admin, 
                        "<br><strong> information is  </strong>", 
                        business$economy)
    leaflet() %>%
    addProviderTiles("CartoDB.Positron") %>%
    addPolygons(data=business,
                layerId=~admin,
                fillColor= ~factpal(category),
                fillOpacity = 0.7, 
                color = "#BDBDC3", 
                weight = 1, 
                popup = state_popup,
                highlight = highlightOptions(
                weight = 5,
                color = "#666",
                dashArray = "",
                fillOpacity = 0.7,
                bringToFront = TRUE))})


observeEvent(input$Map_shape_click, { # update the location selectInput on map clicks
  p <- input$Map_shape_click
  if(!is.null(p$admin)){
    if(is.null(input$Business) || input$Business!=p$admin) updateSelectInput(session, "Business", selected=p$admin)
  }
})
}
)

ui.r

navbarPage("Market Portal",
tabPanel("About",
           bootstrapPage(
             leafletOutput("Map",width="100%",height="800px"),
             absolutePanel(top=100, right=50,
             selectInput("Business", "Business", c("Brazil","Colombia","Panama","Kazakhstan","Argentina","India","Chile","Dominican Republic","United Kingdom","El Salvador","United States of America"), selected="")
))))

Answer 1

传单中的click事件返回lat，lng和id（以及随机值）。所以你只能访问其中一个元素。

id值与您在形状绘图功能中指定的layerId相关，因此在您的情况下为layerId=~admin。

因此，您可以通过点击的admin字段

来获得id值

将p$admin替换为p$id，您应该有自己的解决方案。

如果您想查看click事件中的内容，只需在其周围添加print语句

observeEvent(input$Map_shape_click, { # update the location selectInput on map clicks
  p <- input$Map_shape_click
  print(p)
})

它会将对象打印到控制台。