Shiny-pkg-2-shinyJS

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disable()  #控件（包括输入控件/动作按钮等）失效
enable()   #控件恢复

## 示例：当文本输入为空时，submit按钮为失效状态
ui = fluidPage(
  useShinyjs(),  # Set up shinyjs
  textInput("name","Give your name"),
  actionButton("submit", "Click me")
)

server = function(input, output, session) {
  observe({
    if (is.null(input$name) || input$name == "") {
      shinyjs::disable("submit")
    } else {
      shinyjs::enable("submit")
    }
  })
}

shinyApp(ui, server)

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toggleState()  #可以进行更简单的控件状态转换

## 示例1：当文本输入为空时，submit按钮为失效状态
ui = fluidPage(
  useShinyjs(),  # Set up shinyjs
  textInput("name","Give your name"),
  actionButton("submit", "Click me")
)
server = function(input, output, session) {
  observe({
    shinyjs::toggleState("submit", !is.null(input$name) && input$name != "")
  })
}

shinyApp(ui, server)

## 示例2：控制输入栏的失效与恢复
ui = fluidPage(
  useShinyjs(),  
  actionButton("btn", "Click me"),
  textInput("element", "Watch what happens to me")
)
server = function(input, output, session) {
  observeEvent(input$btn, {
    toggleState("element")
  })
}

shinyApp(ui, server)

## 示例3：disabled() 初始状态设置为失效状态
ui = fluidPage(
  useShinyjs(),  
  actionButton("btn", "Click me"),
  disabled(
    textInput("element", "Watch what happens to me")
  )
)
server = function(input, output, session) {
  observeEvent(input$btn, {
    toggleState("element")
  })
}

shinyApp(ui, server)

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hide()
show()

# 示例
ui = fluidPage(
  useShinyjs(),  # Set up shinyjs
  actionButton("btn", "Click me"),
  textInput("text", "Text")
)
server = function(input, output, session) {
  observe({
    if(input$btn %% 2 ==0){ #点击1次消失，再点击一次出现
      show("text")
    } else {
      hide("text")
    }
  })
}

shinyApp(ui, server)

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toggle() #可以进行更简单的控件显示与隐藏

## 示例1
ui = fluidPage(
  useShinyjs(),  # Set up shinyjs
  actionButton("btn", "Click me"),
  textInput("text", "Text")
)
server = function(input, output, session) {
  observeEvent(input$btn, {
    toggle("text")
  })
}

shinyApp(ui, server)

## 示例2：hidden() 设置UI初始的隐藏状态
ui = fluidPage(
  useShinyjs(),  # Set up shinyjs
  actionButton("btn", "Click me"),
  hidden(
    div(  #包裹在div或其它等
      id = "this_div",
      textInput("text", "Text")
    )
  )
)
server = function(input, output, session) {
  observeEvent(input$btn, {
    toggle("this_div")
  })
}

shinyApp(ui, server)