r - Shinyalerts : How do I know whether user pressed OK or Cancel?

Question

我正在创建一个允许用户删除一些信息的应用程序。但是，我想确保被删除的文件是正确的文件，而不是立即删除它。我遇到了 shinyalerts 包，它允许显示“你确定吗？”弹出。但是，我如何知道用户选择了什么并将其传递给 Shiny？

library(shiny)
library(shinyalert)

shinyApp(
  ui = fluidPage(
    useShinyalert(),  # Set up shinyalert
    actionButton("btn", "Delete")
  ),
  server = function(input, output) {
    observeEvent(input$btn, {
      shinyalert(
        title = "Are you sure you want to delete this file?",
        text = "You will not be able to recover this imaginary file!",
        type = "warning",
        showCancelButton = TRUE,
        confirmButtonCol = '#DD6B55',
        confirmButtonText = 'Yes, delete it!'
      )

    })
  }
)

Answer 1

您可以使用 callbackR()例如将其存储在 reactiveValue() (命名为全局):callbackR = function(x) global$response <- x .

完整的应用程序如下:

library(shiny)
library(shinyalert)

shinyApp(
  ui = fluidPage(
    useShinyalert(),  # Set up shinyalert
    actionButton("btn", "Delete")
  ),
  server = function(input, output) {
    global <- reactiveValues(response = FALSE)

    observeEvent(input$btn, {
      shinyalert(
        title = "Are you sure you want to delete this file?",
        callbackR = function(x) {
          global$response <- x
        },
        text = "You will not be able to recover this imaginary file!",
        type = "warning",
        showCancelButton = TRUE,
        confirmButtonCol = '#DD6B55',
        confirmButtonText = 'Yes, delete it!'
      )
      print(global$response)
    })
  }
)