我写了一个应用程序，试图将其模块化。一般来说，我在应用程序的主体中添加了传单地图(在主模块中(，我想做的是编写一些其他模块，这些模块引用了我的主地图(在地图上显示/隐藏点和其他空间操作(。我试着从其他模块中引用这个地图(在主模块中(。在下面的例子中，我将地图作为反应表达式从主模块中传递，但当我按下显示地图上的点的按钮时，错误就会显示出来：
Error in if: missing value where TRUE/FALSE needed
是否可以将映射传递到另一个模块？在那里使用leafletProxy？
以下是可复制的示例：
library(shiny)
library(dplyr)
library(sf)
library(leaflet)
moduleServer <- function(id, module) {
callModule(module, id)
}
# Main module - UI 1 #
mod_btn_UI1 <- function(id) {
ns <- NS(id)
tagList(
leafletOutput(ns("map")),
mod_btn_UI2(ns("other"))
)
}
# Main module - Server 1 #
mod_btn_server1 <- function(id){
moduleServer(id, function(input, output, session) {
ns <- NS(id)
# here I pass map as reactive
passMap = reactive({input$map})
coords <- quakes %>%
sf::st_as_sf(coords = c("long","lat"), crs = 4326)
output$map <- leaflet::renderLeaflet({
leaflet::leaflet() %>%
leaflet::addTiles() %>%
leaflet::setView(172.972965,-35.377261, zoom = 4) %>%
leaflet::addCircleMarkers(
data = coords,
stroke = FALSE,
radius = 6)
})
mod_btn_server2("other", passMap)
})
}
# Other module - UI 2 #
mod_btn_UI2 <- function(id) {
ns <- NS(id)
tagList(
actionButton(inputId = ns("btn"), label = "show points")
)
}
# Other module - Server 2 #
mod_btn_server2 <- function(id, passMap){
moduleServer(id, function(input, output, session) {
ns <- NS(id)
coords <- quakes %>%
sf::st_as_sf(coords = c("long","lat"), crs = 4326)
observeEvent(input$btn, {
leaflet::leafletProxy(passMap()) %>%
leaflet::addCircleMarkers(
data = coords,
stroke = TRUE,
color = "red",
radius = 6)
})
})
}
# Final app #
ui <- fluidPage(
tagList(
mod_btn_UI1("test-btn"))
)
server <- function(input, output, session) {
mod_btn_server1("test-btn")
}
shinyApp(ui = ui, server = server)
似乎需要将传单代理作为响应传递给模块，使其工作。
在模块mod_btn_server1:中添加了传单代理，而不是变量passMap的输入名称
proxymap <- reactive(leafletProxy('map'))
mod_btn_server2("other", proxymap)
在mod_btn_server2中，您必须将Passmap更改为leafletproxy本身，从而删除对leafletpoxy:的调用
observeEvent(input$btn, {
passMap() %>%
leaflet::addCircleMarkers(
data = coords,
stroke = TRUE,
color = "red",
radius = 6)
})
这里的完整代码：
library(shiny)
library(dplyr)
library(sf)
library(leaflet)
moduleServer <- function(id, module) {
callModule(module, id)
}
# Main module - UI 1 #
mod_btn_UI1 <- function(id) {
ns <- NS(id)
tagList(
leafletOutput(ns("map")),
mod_btn_UI2(ns("other"))
)
}
# Main module - Server 1 #
mod_btn_server1 <- function(id){
moduleServer(id, function(input, output, session) {
ns <- NS(id)
# here I pass map as reactive
passMap = reactive({input$map})
coords <- quakes %>%
sf::st_as_sf(coords = c("long","lat"), crs = 4326)
output$map <- leaflet::renderLeaflet({
leaflet::leaflet() %>%
leaflet::addTiles() %>%
leaflet::setView(172.972965,-35.377261, zoom = 4) %>%
leaflet::addCircleMarkers(
data = coords,
stroke = FALSE,
radius = 6)
})
proxymap <- reactive(leafletProxy('map'))
mod_btn_server2("other", proxymap)
})
}
# Other module - UI 2 #
mod_btn_UI2 <- function(id) {
ns <- NS(id)
tagList(
actionButton(inputId = ns("btn"), label = "show points")
)
}
# Other module - Server 2 #
mod_btn_server2 <- function(id, passMap){
moduleServer(id, function(input, output, session) {
ns <- NS(id)
coords <- quakes %>%
sf::st_as_sf(coords = c("long","lat"), crs = 4326)
observeEvent(input$btn, {
passMap() %>%
leaflet::addCircleMarkers(
data = coords,
stroke = TRUE,
color = "red",
radius = 6)
})
})
}
# Final app #
ui <- fluidPage(
tagList(
mod_btn_UI1("test-btn"))
)
server <- function(input, output, session) {
mod_btn_server1("test-btn")
}
shinyApp(ui = ui, server = server)