这类似于[我的(Multiple expressions in Shiny R Reactive output)之前的问题!我想在哪里根据selectinput对我的数据进行子集化。我拆分了slect输入并添加了一个以selectinput为条件的复选框。现在我希望只使用if子句调整colum向量,但它不起作用。
library(shiny)
library(datasets)
DT<-rbind(data.table(LP=rep("with.LP",3),Total=seq(6,8)+seq(1,3)/2,Life=seq(1,3)/2),
data.table(LP=rep("wo.LP",3),Total=seq(6,8),Life=0))
Cols<-c("Total")
server<-shinyServer(function(input, output) {
# renderUI for conditional checkbox in UI for separately
output$conditionalInput<- renderUI({
if(input$life.pension=="with.LP"){
checkboxInput("show.LP", "Show separately", FALSE)
}
})
#Condition if input$show.lp == TRUE
cond.cols<- reactive({
if(input$show.lp) {
c(Cols,"Life")}
})
# calculate table
output$view <- renderTable({
head(DT[LP==input$life.pension,.SD,.SDcols=Cols])
})
})
# Define UI for dataset viewer application
ui<-shinyUI(fluidPage(
# Application title
titlePanel("Shiny Example"),
# Sidebar with controls to select a dataset and specify the
# number of observations to view
sidebarLayout(
sidebarPanel(
selectInput("life.pension", label = h3("Include L&P?"),
choices = list("Yes" = "with.LP", "No" = "wo.LP")
,selected = "with.LP"),
uiOutput("conditionalInput")
),
# Show a summary of the dataset and an HTML table with the
# requested number of observations
mainPanel(
tableOutput("view")
)
)
))
runApp(list(ui=ui,server=server))
答案 0 :(得分:4)
1)输入名称中的错误:&#34; show.LP&#34; !=&#34; show.lp&#34;
2)你永远不会使用cond.cols
所以你的checkBox什么都不做
3)尝试
#Condition if input$show.lp == TRUE
cond.cols<- reactive({
if(input$show.LP==TRUE & input$life.pension=="with.LP") {
c(Cols,"Life")
}else{
Cols
}
})
和head(DT[LP==input$life.pension,.SD,.SDcols=cond.cols()])
检查输入是否存在
cond.cols<- reactive({
if(!is.null(input$show.LP)){
if(input$show.LP==TRUE & input$life.pension=="with.LP") {
c(Cols,"Life")
}else{
Cols
}}else{
Cols
}
})