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r - 使用一个 if() 而不是多个 observeEvent() 在闪亮的应用程序中显示消息

问题描述

我在下面有一个闪亮的应用程序，其中我使用了三个基于操作按钮激活的观察者。我想知道如何用包含所有 3 个条件的 if() 替换这些观察者。

library(shiny)
library(shinyWidgets)

ui <- fluidPage(
  tags$h2("Sweet Alert examples"),
  actionButton(
    inputId = "success",
    label = "Launch a success sweet alert",
    icon = icon("check")
  ),
  actionButton(
    inputId = "error",
    label = "Launch an error sweet alert",
    icon = icon("remove")
  ),
  actionButton(
    inputId = "sw_html",
    label = "Sweet alert with HTML",
    icon = icon("thumbs-up")
  )
)

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

  observeEvent(input$success, {
    sendSweetAlert(
      session = session,
      title = "Success !!",
      text = "All in order",
      type = "success"
    )
  })

  observeEvent(input$error, {
    sendSweetAlert(
      session = session,
      title = "Error !!",
      text = "It's broken...",
      type = "error"
    )
  })

  observeEvent(input$sw_html, {
    sendSweetAlert(
      session = session,
      title = NULL,
      text = tags$span(
        tags$h3("With HTML tags",
                style = "color: steelblue;"),
        "In", tags$b("bold"), "and", tags$em("italic"),
        tags$br(),
        "and",
        tags$br(),
        "line",
        tags$br(),
        "breaks",
        tags$br(),
        "and an icon", icon("thumbs-up")
      ),
      html = TRUE
    )
  })

}

shinyApp(ui, server)

标签： rif-statementshinyobservers

解决方案

你可以在得到事件后调用一个辅助函数来做你想做的事

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

  observeEvent(input$success, {sendMessage("success")})
  observeEvent(input$error, {sendMessage("error")})
  observeEvent(input$sw_html, {sendMessage("sw_html")})

  sendMessage <- function(type) {
    if (type=="success") {
     sendSweetAlert(
        session = session,
        title = "Success !!",
        text = "All in order",
        type = "success"
      )
   } else if (type=="error") {
      sendSweetAlert(
        session = session,
        title = "Error !!",
        text = "It's broken...",
        type = "error"
      )
   } else if (type="sw_html") {
     sendSweetAlert(
        session = session,
        title = NULL,
        text = tags$span(
          tags$h3("With HTML tags",
                  style = "color: steelblue;"),
          "In", tags$b("bold"), "and", tags$em("italic"),
          tags$br(),
          "and",
          tags$br(),
          "line",
          tags$br(),
          "breaks",
          tags$br(),
          "and an icon", icon("thumbs-up")
        ),
        html = TRUE
      )
   }
  }
}

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