【发布时间】：2018-06-04 00:17:38
【问题描述】：
我做错了什么，或者为什么下面的例子不起作用？我正在尝试使用选项iconCreateFunction 在 R Shiny 应用程序中使传单标记集群插件与leafletProxy() 一起使用。插件是否无法使用leafletProxy()向地图添加自定义图标标记？
当我按下第一个按钮并在下面的示例中缩小时，我收到一条错误消息：
TypeError: this._group.options.iconCreateFunction 不是函数
我尝试从 markercluster 文档中复制the original example：
library(shiny)
library(dplyr)
library(leaflet)
ui <- fluidPage(
titlePanel("Hello Shiny!"),
sidebarLayout(
sidebarPanel(
actionButton(inputId = "my_button1",
label = "Use leafletProxy()"),
actionButton(inputId = "my_button2",
label = "Use renderLeaflet()")
),
mainPanel(
leafletOutput(
outputId = "map",
width = "100%",
height = "300px"
)
)
)
)
server <- function(input, output, session) {
some_data <- data.frame(
"lon"=c(4.905167,4.906357,4.905831),
"lat"=c(52.37712,52.37783,52.37755),
"number_var"=c(5,9,7),
"name"=c("Jane","Harold","Mike"),
stringsAsFactors = F
)
output$map <- renderLeaflet({
return(
leaflet(data = some_data[0,]) %>%
addProviderTiles(providers$CartoDB.Positron) %>%
fitBounds(
min(some_data$lon),
min(some_data$lat),
max(some_data$lon),
max(some_data$lat)
) %>%
addMarkers(
lng = ~lon,
lat = ~lat,
clusterOptions = markerClusterOptions(
iconCreateFunction = JS(paste0("function(cluster) {",
"return new L.DivIcon({",
"html: '<div style=\"background-color:rgba(77,77,77,0.5)\"><span>' + cluster.getChildCount() + '</div><span>',",
"className: 'marker-cluster'",
"});",
"}"))
)
)
)
})
observeEvent(input$my_button1,{
leafletProxy(mapId = "map",
session = session,
data = some_data) %>%
addProviderTiles(providers$CartoDB.Positron) %>%
clearMarkerClusters() %>%
clearMarkers() %>%
fitBounds(
min(some_data$lon),
min(some_data$lat),
max(some_data$lon),
max(some_data$lat)
) %>%
addMarkers(
lng = ~lon,
lat = ~lat,
clusterOptions = markerClusterOptions(
iconCreateFunction = JS(paste0("function(cluster) {",
"console.log('Here comes cluster',cluster); ",
"return new L.DivIcon({",
"html: '<div style=\"background-color:rgba(77,77,77,0.5)\"><span>' + cluster.getChildCount() + '</div><span>',",
"className: 'marker-cluster'",
"});",
"}"))
)
)
})
observeEvent(input$my_button2,{
output$map <- renderLeaflet({
leaflet(data = some_data) %>%
addProviderTiles(providers$CartoDB.Positron) %>%
fitBounds(
min(some_data$lon),
min(some_data$lat),
max(some_data$lon),
max(some_data$lat)
) %>%
addMarkers(
lng = ~lon,
lat = ~lat,
clusterOptions = markerClusterOptions(
iconCreateFunction = JS(paste0("function(cluster) {",
"console.log('Here comes cluster',cluster); ",
"return new L.DivIcon({",
"html: '<div style=\"background-color:rgba(77,77,77,0.5)\"><span>' + cluster.getChildCount() + '</div><span>',",
"className: 'marker-cluster'",
"});",
"}"))
)
)
})
})
}
shinyApp(ui = ui, server = server)
软件包版本：
dplyr_0.7.4
leaflet_1.1.0
shiny_1.0.5
R version 3.4.3 (2017-11-30)
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 16.04.3 LTS
浏览器版本：Firefox Quantum 57.0.1（64 位）
【问题讨论】：
-
我在运行您的代码时没有收到任何错误。不过我在 Mac 上。
-
按下两个按钮时您会看到标记吗？感谢您的尝试。
-
第一次按leafletProxy()后是，但不是在缩小后
-
谢谢。这正是问题所在。 markercluser 插件应该组织缩放，但在
leafletProxy的情况下，这似乎不起作用（当然，向地图动态添加标记会非常有用）。
标签： javascript r shiny leaflet leaflet.markercluster