我创建了一个(用于演示目的,可复制的)闪亮应用程序,其中ui通过单击“加载”按钮创建一些数据(DataPack
)(包含两个元素的列表)。该列表的每个元素都是通过lapply
函数中的server
通过模块绘制的。
该应用正常运行,但是情节却以相反的顺序显示(DataPack$two
和rnorm(n)^2
与DataPack$one
和rnorm(n)
)相反,但预计显示为( lapply(names(DataPack()), function(DataSetName) {...})
)。如何按给定的顺序修复此/重复调用模块,该行为的解释是什么?
library(shiny)
library(TTR)
Module_ui <- function(id) {
ns <- shiny::NS(id)
shiny::uiOutput(ns("Plot"))
}
Module_Server <- function(
input, output, session,
DataPack, DataSetName, InputButton_GetData, xlim) {
AnalysedPack <- eventReactive(c(
InputButton_GetData(),
input$InputButton_ProcessData), {
message(paste("Analysed Pack", DataSetName))
AnalysedPack <-
runMean(DataPack()[[DataSetName]],
min(input$NumericInput_BW,
length(DataPack()[[DataSetName]])))
return(AnalysedPack)
})
output[['Plot']] <- renderUI({
ns <- session$ns
tags$div(
id = environment(ns)[['namespace']],
tagList(
fluidRow(
column(2, column(12, fluidRow(
numericInput(
inputId = ns("NumericInput_BW"),
label = NULL,
min = 1,
max = 100,
value = 10,
step = 1))),
fluidRow(
column(12, actionButton(
ns("InputButton_ProcessData"),
"Process", width = "100%")))),
column(10,
renderPlot({
message(paste("Base_Plot", DataSetName))
plot(DataPack()[[DataSetName]],
xlim = c(xlim()[1],
xlim()[2]))
lines(AnalysedPack(),
col = "tomato", lwd = 2)
}) ) )
)
)
})
}
ui <- fluidPage(
fluidRow(
column(
6,
column(
12,
fluidRow(h4("Data Generation")),
fluidRow(actionButton(
"InputButton_GetData", "Load", width = "100%")))),
column(
6,
column(
12,
fluidRow(h4("Update Plot")),
sliderInput(
"SliderInput_xAxis",
label = NULL,
min = 0,
max = 150,
value = c(0, 150),
animate = TRUE)
)
),
column(12, actionButton('addButton', '', icon = icon('plus')))
)
)
server <- function(input, output, session) {
DataPack <- eventReactive(
input$InputButton_GetData, {
message("DataPack")
n <- round(runif(1, min = 100, max = 500))
message(n)
DataPack <- NULL
DataPack$one <- rnorm(n)
DataPack$two <- rnorm(n)^2
updateSliderInput(
session = session,
inputId = "SliderInput_xAxis",
value = c(1, n),
min = 1,
max = n)
return(DataPack)
})
SliderInput_xAxis_rx <-
reactive(input$SliderInput_xAxis)
InputButton_GetData_rx <-
reactive(input$InputButton_GetData)
observeEvent(input$InputButton_GetData, {
lapply(names(DataPack()), function(DataSetName) {
id <- sprintf('Plot%s', DataSetName)
insertUI(
selector = "#addButton",
where = "afterEnd",
ui = Module_ui(id)
)
callModule(
Module_Server, id,
DataPack = DataPack,
DataSetName = DataSetName,
InputButton_GetData = InputButton_GetData_rx,
xlim = SliderInput_xAxis_rx)
})
})
}
shinyApp(ui, server)
答案 0 :(得分:1)
此代码:
insertUI(
selector = "#addButton",
where = "afterEnd",
ui = Module_ui(id)
)
在元素#addButton
之后插入UI。因此,第一个调用会生成,示意性地:
#addButton
ui1
第二个呼叫(作为第一个呼叫)插入到#addButton
之后,而不是ui1
之后:
#addButton
ui2
ui1
因此,颠倒名称。