R Leaflet PopupGraph - map_marker_click 上的 addPopupGraphs

Question

我想使用 r leaflet 和 leafpop 库在 map_marker_click 上为我的每个标记打开一个带有独特图的弹出窗口。

当用户点击每个点时，将计算要显示的绘图。

下面是一个可重现的代码，但它 return 没有任何错误。
有什么想法吗？

library(tidyverse)
library(ggplot2)
library(shiny)
library(leaflet)
library(leafpop)


id <- c(1,1,1,1,2,2,3,3,3,4)
lat <- c(49.823, 49.823, 49.823, 49.823, 58.478, 58.478, 57.478 , 57.478 , 57.478, 38.551)
lng <- c(-10.854, -10.854, -10.854, -10.854, -11.655, -11.655, 2.021 , 2.021 , 2.021, 5.256)
type <- c("A","C","B","B","C","A","B","A","C","B")
date <- c(152.5,307.5,145,481,152,109.5,258.5,107.5,186.5,150)
start <- c(123,235,135,192,149,101,205,75,155,100)
stop <- c(182,380,155,289,155,218,312,140,218,200)
myData <- data.frame(id,type,date,start,stop,lat,lng)


chronogramme<- function(dataId){

  dataFiltered<-filter(myData,id==dataId)

  p<- ggplot(dataFiltered,aes(type,date))+
    geom_linerange(aes(ymin=start,ymax=stop),size=5)+
    coord_flip()
  return(p)
}


ui <- fluidPage(
  leafletOutput("map"),
  plotOutput("plot")
)


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

  #Sortie map
  output$map <- renderLeaflet({
    leaflet()%>%
      addProviderTiles(providers$CartoDB.Positron) %>% 
      addCircleMarkers(
        layerId=~id,
        data = myData,
        lat = myData$lat,
        lng = myData$lng,
        radius = 5,
        color = 'blue',
        stroke = FALSE,
        fillOpacity = 1,
        group = 'markers'
      )
  })

  observeEvent(input$map_marker_click,{
    p <- chronogramme(input$map_marker_click$id)
    isolate({
      leafletProxy("map") %>% addPopupGraphs(list(p), group = 'markers')
    })
  })

}

# Create Shiny app ----
shinyApp(ui = ui, server = server)

Answer 1

我用地图处理这个问题的方法是在 renderLeaflet 中添加圆圈标记后使用 addPopupGraphs（而不是 observeEvent 检测标记上的点击）。

在这种情况下，您可以创建一个地块列表，例如：

p_all <- lapply(myData$id, chronogramme)

然后使用p_all列表如下：

output$map <- renderLeaflet({
    leaflet()%>%
      addProviderTiles(providers$CartoDB.Positron) %>% 
      addCircleMarkers(
        layerId=~id,
        data = myData,
        lat = myData$lat,
        lng = myData$lng,
        radius = 5,
        color = 'blue',
        stroke = FALSE,
        fillOpacity = 1,
        group = 'markers'
      ) %>%
      addPopupGraphs(p_all, group = 'markers')
  })

然后你就不需要observeEvent。

这行得通吗？

Answer 2

感谢您的回复，问题是我的应用程序中有很多数据，所以迭代所有绘图都不起作用。

但是，我找到了另一种解决方案：将每个创建的图临时存储为 svg，并使用 addPopus() 显示它们：

library(tidyverse)
library(ggplot2)
library(shiny)
library(leaflet)
library(leafpop)
library(lattice)


id <- c(1,1,1,1,2,2,3,3,3,4)
lat <- c(49.823, 49.823, 49.823, 49.823, 58.478, 58.478, 57.478 , 57.478 , 57.478, 38.551)
lng <- c(-10.854, -10.854, -10.854, -10.854, -11.655, -11.655, 2.021 , 2.021 , 2.021, 5.256)
type <- c("A","C","B","B","C","A","B","A","C","B")
date <- c(152.5,307.5,145,481,152,109.5,258.5,107.5,186.5,150)
start <- c(123,235,135,192,149,101,205,75,155,100)
stop <- c(182,380,155,289,155,218,312,140,218,200)
myData <- data.frame(id,type,date,start,stop,lat,lng)

folder <- tempfile()
dir.create(folder)

chronogramme<- function(dataId){

  dataFiltered<-filter(myData,id==dataId)

  p<- ggplot(dataFiltered,aes(type,date))+
    geom_linerange(aes(ymin=start,ymax=stop),size=5)+
    coord_flip()
  return(p)
}


ui <- fluidPage(
  leafletOutput("map")
)


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

  #Sortie map
  output$map <- renderLeaflet({
    leaflet()%>%
      addProviderTiles(providers$CartoDB.Positron) %>% 
      addCircleMarkers(
        layerId=~id,
        data = myData,
        lat = myData$lat,
        lng = myData$lng,
        radius = 5,
        color = 'blue',
        stroke = FALSE,
        fillOpacity = 1
      )
  })

  # When map is clicked, show a popup with city info
  showPopup <- function(id, lat, lng) {
    chrngr <- chronogramme(id)
    svg(filename= paste(folder,"plot.svg", sep = "/"), 
        width = 500 * 0.005, height = 300 * 0.005)
    print(chrngr)
    dev.off()

    content <- paste(readLines(paste(folder,"plot.svg",sep="/")), collapse = "")

    leafletProxy("map") %>% addPopups(lng, lat, content, layerId = id)
  }

  observe({
    leafletProxy("map") %>% clearPopups()
    event <- input$map_marker_click
    if (is.null(event))
      return()

    isolate({
      showPopup(event$id, event$lat, event$lng)
    })
  })

}



# Create Shiny app ----
shinyApp(ui = ui, server = server)