闪亮的传单ploygon单击事件 [英] shiny leaflet ploygon click event

问题描述

我有一张称为business的地图，该地图是从Natural Earth网站下载的.我在这里所做的是创建了一个基本的Map输出，其中显示了地图.我主要使用两列，分别是admin(国家名称)和economy.然后，我在ui下添加了一个名为Business的下拉列表，以便当我单击国家/地区的多边形时，该列表将刷新并显示要单击的国家/地区.我假设当我写p <- input$Map_shape_click闪亮时，它会知道p是business对象，因此它具有列admin，并且我已经引用了该admin ID来刷新我的Business下拉列表.但这不起作用.该链接显示了我所看到的内容-当我单击其他国家/地区时，列表不会刷新.

I have a map called business which is downloaded from natural earth website. What I am doing here is I created a basic Map output which shows the map. I am mainly using two columns which are admin(which is the name of the country) and economy here. Then I added a drop down list called Business under ui so that when I click the polygon of the country the list would refresh and show the country that I am clicking. I assume when I write p <- input$Map_shape_click shiny would know p is a business object so it has column admin and I have reference this admin ID to refresh my Business drop down list. But it doesn't work.The link shows what I am seeing - the list wouldn't refresh when I click a different country.

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="")
))))

推荐答案

传单中的click事件返回lat，lng和id(以及随机值).因此，您只能访问这些元素之一.

The click event in leaflet returns lat, lng and id (and a random value). So you can only access one of those elements.

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

The id value relates to the layerId you specify in the shape plotting function, so in your case that's layerId=~admin.

因此，您可以通过点击的id字段获得admin值

So you acccess the admin value through the click's id field

用p$id替换p$admin，您应该有解决方案.

replace p$admin with p$id and you should have your solution.

如果您想查看click事件中的内容，只需在其周围放一个print语句

If you want to see what's in the click event, just put a print statement around it

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

，它将把对象打印到控制台.

and it will print the object to the console.

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