r-模块内部模块闪亮

Question

我试图从模块内部调用模块，但遇到了一些问题。

第一个代码正在运行，它显示了一个带有创建弹出窗口的按钮的应用程序。弹出窗口中有一个绘图和一个滑块输入。弹出图在其自己的模块中定义。

library(shiny)
library(shinyWidgets)
uiForModal <<- function(id) {
ns <- NS(id)
tagList(
fluidRow(
plotOutput(outputId = ns("plot")),
sliderInput(
inputId =ns( "clusters"),
label = "Number of clusters",
min = 2, max = 6, value = 3, width = "100%"
)
)
)   
}
serverForModal <<- function(input, output, session) {
output$plot <- renderPlot({
print(head(iris))
plot(Sepal.Width ~ Sepal.Length,
data = iris, col = Species,
pch = 20, cex = 2)
points(kmeans(iris[, 1:2], input$clusters)$centers,
pch = 4, cex = 4, lwd = 4)
})
}
ui <- fluidPage(
actionButton("showPlot", "showPlot")
)
server <- function(input, output){
observeEvent(input$showPlot, {
show_alert(
title = "Some Title",
text = tags$div(
uiForModal("test1")
),
html = TRUE,
width = "80%"
)
})
callModule(serverForModal, "test1")
}
runApp(shinyApp(ui, server))

当我试图将按钮放在它自己的模块中时，就会出现问题。下面的代码是我失败的尝试。我认为问题与命名空间有关。在下面的代码中，按钮调用带有弹出窗口和滑块的UI，但绘图没有显示。所以我认为问题出在绘图的服务器命名空间中。有人能帮帮我吗？

library(shiny)
library(shinyWidgets)
uiForModal <<- function(id) {
print(id)
ns <- NS(id)
print(ns("plot"))
tagList(
fluidRow(
plotOutput(outputId = ns("plot")),
sliderInput(
inputId =ns( "clusters"),
label = "Number of clusters",
min = 2, max = 6, value = 3, width = "100%"
)
)
)   
}
serverForModal <<- function(input, output, session) {
output$plot <- renderPlot({
print(head(iris))
plot(Sepal.Width ~ Sepal.Length,
data = iris, col = Species,
pch = 20, cex = 2)
points(kmeans(iris[, 1:2], input$clusters)$centers,
pch = 4, cex = 4, lwd = 4)
})
}
uiForButton <<- function(id) {
ns <- NS(id)
tagList(
fluidRow(
actionButton(ns("showPlot"), "showPlot")
)
)
}
serverForButton <<- function(input, output, session, ns) {
observeEvent(input$showPlot, {
show_alert(
title = "Some Title",
text = tags$div(
uiForModal(ns("test2"))
),
html = TRUE,
width = "80%"
)
})
callModule(serverForModal, ns("test2"))
}
ui <- fluidPage(
uiForButton("test1")
)
server <- function(input, output){
callModule(serverForButton, "test1", NS("test1"))
}

runApp(shinyApp(ui, server))

Answer 1

更改

callModule(serverForModal, ns("test2"))

至

callModule(serverForModal, "test2")