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두 데이터 세트로로드하는 eventReactive 함수가 있습니다. 각 데이터 세트를 선택할 수 있지만 모두 동일한 eventReactive에로드됩니다. 그러나 사용자가 두 데이터 집합 중 하나만 변경하면 둘 모두를로드하지 않고 변경 한 데이터 집합 만로드하려고합니다. 나는 이것이 두 개의 액션 버튼으로 훨씬 더 쉬울 것이라는 것을 안다.하지만 나는 하나의 버튼을 가질 필요가있다. 아래 예제 코드를 찾으십시오.반짝이는 앱에서 불필요한로드를 피하십시오
예에서 변수의 변경된 코드 부분 만 다시 실행하고 싶습니다. ui.r :
library(shiny)
# Define UI for dataset viewer application
shinyUI(fluidPage(
# Application title
titlePanel("Reactivity"),
# Sidebar with controls to provide a caption, select a dataset,
# and specify the number of observations to view. Note that
# changes made to the caption in the textInput control are
# updated in the output area immediately as you type
sidebarLayout(
sidebarPanel(
textInput("caption", "Caption:", "Data Summary"),
actionButton('Go','Go'),
selectInput("dataset", "Choose a dataset:",
choices = c("rock", "pressure", "cars")),
selectInput("dataset2", "Choose a dataset:",
choices = c("rock", "pressure", "cars")),
numericInput("obs", "Number of observations to view:", 10)
),
# Show the caption, a summary of the dataset and an HTML
# table with the requested number of observations
mainPanel(
h3(textOutput("caption", container = span)),
verbatimTextOutput('one'),
verbatimTextOutput('two'),
verbatimTextOutput("summary"),
verbatimTextOutput("summary2")#,
# tableOutput("view"),
# tableOutput("view2")
)
)
))
server.r
library(shiny)
library(datasets)
# Define server logic required to summarize and view the selected
# dataset
shinyServer(function(input, output) {
# By declaring datasetInput as a reactive expression we ensure
# that:
#
# 1) It is only called when the inputs it depends on changes
# 2) The computation and result are shared by all the callers
# (it only executes a single time)
#
datasetInput <- eventReactive(input$Go,{
##Only run if input$dataset has changed##
withProgress(message='Loading 1:This should take very long....',value=0,{
for(i in 1:5){
Sys.sleep(1)
incProgress(i/5)
}
x<-switch(input$dataset,
"rock" = rock,
"pressure" = pressure,
"cars" = cars)
})
###only run if input$dataset2 has changed
withProgress(message='Loading 2:This should take even longer....',value=0,{
for(i in 1:5){
Sys.sleep(1.5)
incProgress(i/5)
}
y<-switch(input$dataset2,
"rock" = rock,
"pressure" = pressure,
"cars" = cars)
})
return(list(x=x,y=y,input1=input$dataset,input2=input$dataset2))
})
# The output$caption is computed based on a reactive expression
# that returns input$caption. When the user changes the
# "caption" field:
#
# 1) This function is automatically called to recompute the
# output
# 2) The new caption is pushed back to the browser for
# re-display
#
# Note that because the data-oriented reactive expressions
# below don't depend on input$caption, those expressions are
# NOT called when input$caption changes.
output$caption <- renderText({
input$caption
})
# The output$summary depends on the datasetInput reactive
# expression, so will be re-executed whenever datasetInput is
# invalidated
# (i.e. whenever the input$dataset changes)
output$summary <- renderPrint({
dataset <- datasetInput()$x
summary(dataset)
})
output$summary2 <- renderPrint({
dataset <- datasetInput()$y
summary(dataset)
})
# The output$view depends on both the databaseInput reactive
# expression and input$obs, so will be re-executed whenever
# input$dataset or input$obs is changed.
output$view <- renderTable({
head(datasetInput()$x, n = input$obs)
})
output$view2 <- renderTable({
head(datasetInput()$y, n = input$obs)
})
output$one<-renderText(datasetInput()$input1)
output$two<-renderText(datasetInput()$input2)
})
이미이 같은 시도 : 아마 당신이 반응 함수 내 값을 사용하고 있기 때문에, if(datasetInput()$input1 != input$dataset){execute...}이 그러나이 작동하지 않습니다 그 동일한 기능에서 생성됩니다 ...
매우 감사합니다. –