R Shiny checkboxGroupInput - 单击选择所有复选框

Question

我有一个包含 checkboxGroupInput 的 R Shiny 应用程序，我正在尝试使用 updateCheckboxGroupInput 函数创建一个“全选”按钮。
你可以在下面看到完整的代码，但基本上我是这样定义 cb 组的:

checkboxGroupInput("campaigns","Choose campaign(s):",campaigns_list)

然后，单击按钮，调用函数:

updateCheckboxGroupInput(session,"campaigns","Choose campaign(s):",choices=campaigns_list,selected=campaigns_list)

我有迹象表明该函数已运行，但它实际上是取消选中复选框。
顺便说一句，当我将选择放在定义 cbGroupInput 上时，它确实起作用了，但在函数上不起作用。

谢谢!

这是我的 server.R:

library(shiny)
source('usefulFunctions.R')
shinyServer(function(input, output, session) {

  output$cascading <- renderUI({
    provider_id <- input$provider
    if (provider_id == "") return(NULL)
    campaigns_list <<- t(getCampaigns(provider_id))
    tagList(
      checkboxGroupInput("campaigns","Choose campaign(s):", 
                         choices = campaigns_list, selected = campaigns_list),
      actionLink("selectall","Select All")
      )
  })

  observe({
    if(is.null(input$selectall)) return(NULL)
    if (input$selectall > 0)
    {
      print(campaigns_list)
      updateCheckboxGroupInput(session,"campaigns","Choose campaign(s):",choices=campaigns_list,selected=campaigns_list)
    }
    })


})

Answer 1

我还通过检查按钮或链接是否可以被 2 整除，在这里添加了选择和取消选择选项

#rm(list = ls())
library(shiny)
campaigns_list <- letters[1:10]

ui =fluidPage(
  checkboxGroupInput("campaigns","Choose campaign(s):",campaigns_list),
  actionLink("selectall","Select All") 
)
server = function(input, output, session) {

  observe({
    if(input$selectall == 0) return(NULL) 
    else if (input$selectall%%2 == 0)
    {
      updateCheckboxGroupInput(session,"campaigns","Choose campaign(s):",choices=campaigns_list)
    }
    else
    {
      updateCheckboxGroupInput(session,"campaigns","Choose campaign(s):",choices=campaigns_list,selected=campaigns_list)
    }
  })
}
runApp(list(ui = ui, server = server))