闪亮:使renderUI对下拉列表做出反应而不是submitButton

Question

如何让renderUI响应用户从下拉列表中选择不同的值而不必单击我的submitButton？

我有一个包含3个内容的wellPanel:
1)我的下拉列表
2)一组动态输入(由我的renderUI函数创建,取决于#1中的选择)
3)submitButton

所需行为:对下拉选项的更改为用户提供了不同的输入窗口小部件.当他们为所选输入的结果做好准备时,他们会单击submitButton,然后他们会在mainPanel中获得结果.

问题:我的renderUI仅在单击submitButton后对下拉选择作出反应.据我所知,我需要隔离一些东西或使用observeEvent,但我无法弄明白.

简化示例:

rm(list = ls())
library(shiny)

ui  <- fluidPage(
  fluidRow(
column(4,wellPanel(
  selectInput("analysis", label = "Type of Analysis:", 
              c("Award Total" = "total", 
                "Award Average" = "average"),
              width = validateCssUnit("70%")),
  uiOutput("filter_box"),
  submitButton()
    )),
column(8, textOutput("sample_text"))
  )
)

server <- function(input, output, session){

  output$filter_box <- renderUI({
if(input$analysis == "total"){
  tagList(radioButtons(inputId = "input1", label = "Select One:",c("A", "B", "C"), selected = "A"))
} else {
  tagList(checkboxGroupInput(inputId = "input2", label = "Select all that apply:",c("1","2","3","4","5")),
          dateRangeInput(inputId = "input3", label = "Enter Date Range"))
}
})

output$sample_text <- renderText({
  if(input$analysis == "total"){
    input$input1
  } else if(input$analysis == "average") {
    c(input$input2, input$input3)
  }
 })
}

runApp(list(ui = ui, server = server))

Answer 1

您需要引入两个更改.

1. 更改submitButton为a actionButton(请参阅@daattali的评论)

2. 隔离renderText,并使其对actionButton具有反应性.

见下面的代码.

rm(list = ls())
library(shiny)

ui  <- fluidPage(
  fluidRow(
    column(4,wellPanel(
      selectInput("analysis", label = "Type of Analysis:", 
                  c("Award Total" = "total", 
                    "Award Average" = "average"),
                  width = validateCssUnit("70%")),
      uiOutput("filter_box"),
      actionButton(inputId = 'button_1',label = 'Apply Changes')
    )),
    column(8, textOutput("sample_text"))
  )
)

server <- function(input, output, session){

  output$filter_box <- renderUI({
    if(input$analysis == "total"){
      tagList(radioButtons(inputId = "input1", label = "Select One:",c("A", "B", "C"), selected = "A"))
    } else {
      tagList(checkboxGroupInput(inputId = "input2", label = "Select all that apply:",c("1","2","3","4","5")),
              dateRangeInput(inputId = "input3", label = "Enter Date Range"))
    }
  })

  output$sample_text <- renderText({
    input$button_1
    isolate({
      if(input$analysis == "total"){
        input$input1
      } else if(input$analysis == "average") {
        c(input$input2, input$input3)
      }
    })

  })
}

runApp(list(ui = ui, server = server))