我编写了一个尝试模块化的应用程序。一般来说，我将传单 map 添加到我的应用程序的主体中(在主模块中)，我想要做的是编写一些引用我的主 map 的其他模块(显示/隐藏 map 上的点和其他空间操作)。我尝试从其他模块引用此 map (位于主模块中)。在下面的示例中，我从主模块将 map 作为响应式(Reactive)表达式传递，但是当我按下在 map 上显示点的按钮时，就会出现错误:
Error in if: missing value where TRUE/FALSE needed
是否可以将 map 传递到另一个模块？并在那里使用leafletProxy？
这是可重现的示例:
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$btn, {
leaflet::leafletProxy(passMap()) %>%
leaflet::addCircleMarkers(
data = coords,
stroke = TRUE,
color = "red",
radius = 6)
})
})
}
# Final app #
ui <- fluidPage(
tagList(
mod_btn_UI1("test-btn"))
)
server <- function(input, output, session) {
mod_btn_server1("test-btn")
}
shinyApp(ui = ui, server = server)
最佳答案
看来您需要将传单代理作为响应传递给模块才能使其工作。
在模块 mod_btn_server1 中添加了传单代理，而不是变量 passMap 的输入名称:
proxymap <- reactive(leafletProxy('map'))
mod_btn_server2("other", proxymap)
在 mod_btn_server2 中，您必须将 Passmap 更改为 leafletproxy 本身，删除对 leafletproxy 的调用:
observeEvent(input$btn, {
passMap() %>%
leaflet::addCircleMarkers(
data = coords,
stroke = TRUE,
color = "red",
radius = 6)
})
完整代码在这里:
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)
关于r - 是否可以将传单 map 传递到另一个模块？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/67167626/