My Shiny App有多个输入,取决于使用的变量数量。简化版本虽然不起作用,但如下所示。我能够使用一个名为Make.UI的函数基于numericInput来更新UI,我用它来制作uiOutput,但是将输入返回到服务器中超出了我的Shiny技能组合!任何建议都将不胜感激。
格温
library(shiny)
D = matrix(runif(400), nrow = 20)
colnames(D) = labs = sapply(1:20, function(i) {paste0("col",i)})
# Define UI for application that summarises data
ui <- fluidPage(
# Application title
titlePanel("Summaries"),
# Select columns to get fed into summary
tabsetPanel(
tabPanel("Matching Variables Info",
sidebarPanel(
numericInput("NoVars","No. of variables to summarize",
value = 3, min = 2, max = dim(D)[2]),
uiOutput("VarsInput")
),
# Show summaries of columns choosen above
mainPanel(
verbatimTextOutput("dataInfo")
)
)
)
)
# Define the server code
server <- function(input, output){
Make.UI <- function(NoV){
C = sapply(1:NoV, function(i){paste0("cols",i)})
L = sapply(1:NoV, function(i){paste0("label",i)})
output = tagList()
for(i in seq_along(1:NoV)){
output[[i]] = tagList()
output[[i]][[1]] = selectInput(C[i], "Variable to summarize:", labs)
output[[i]][[2]] = textInput(L[i], label = "Label for variable:",
value = "Label for variable Here")
} ## for loop
output
} # closes Make.UI function
K <- reactive({
input$NoVars
})
output$VarsInput <- renderUI({
Make.UI(K())
})
output$dataInfo <- renderPrint({
C <- sapply(1:K(), function(i) {input[[paste0("cols",i)]]})
## the code in the line above doesn't work
summary(D[, C()])
})
}
# Return a Shiny app object
shinyApp(ui = ui, server = server)
答案 0 :(得分:4)
就像我在第一条评论中写的那样,我不确定Make.UI()
函数。如果你真的想把它作为一个单独的功能,你应该让它反应。或者像我在下面的代码中那样使用它。
此外,在output$dataInfo <- renderPrint({
C中不是reactive()
函数,因此您需要删除括号。
library(shiny)
D = matrix(runif(400), nrow = 20)
colnames(D) = labs = sapply(1:20, function(i) {paste0("col",i)})
# Define UI for application that summarises data
ui <- fluidPage(
# Application title
titlePanel("Summaries"),
# Select columns to get fed into summary
tabsetPanel(
tabPanel("Matching Variables Info",
sidebarPanel(
numericInput("NoVars","No. of variables to summarize",
value = 3, min = 2, max = dim(D)[2]),
uiOutput("VarsInput")
),
# Show summaries of columns choosen above
mainPanel(
verbatimTextOutput("dataInfo")
)
)
)
)
# Define the server code
server <- function(input, output){
K <- reactive({
input$NoVars
})
output$VarsInput <- renderUI({
NoV = K()
C = sapply(1:NoV, function(i){paste0("cols",i)})
L = sapply(1:NoV, function(i){paste0("label",i)})
output = tagList()
for(i in seq_along(1:NoV)){
output[[i]] = tagList()
output[[i]][[1]] = selectInput(C[i], "Variable to summarize:", labs)
output[[i]][[2]] = textInput(L[i], label = "Label for variable:",
value = "Label for variable Here")
} ## for loop
output
})
output$dataInfo <- renderPrint({
C <- sapply(1:K(), function(i) {input[[paste0("cols",i)]]})
## the code in the line above doesn't work
summary(D[, C])
})
}
# Return a Shiny app object
shinyApp(ui = ui, server = server)