在Shiny中使用readlines（prompt =）

问题描述

我有一个使用 readlines（prompt =）函数接收输入的代码。您能告诉我Shiny中的哪个输入功能足以使此代码适应Shiny应用吗？

I have a code that takes inputs using the readlines(prompt = ) function. Could you tell me which input function in Shiny will be adequate to adapt this code to a Shiny app?

我需要一个交互功能，我不能在 selectInput（）中使用简单的输入，因为我有一个许多 readlines（prompt =）语句。

I need an interactive function, I can't use a simple input with selectInput() because I have a lot of readlines(prompt = ) statements.

类似于此问题的东西：

Something similar to this question: Include interactive function in shiny to highlight "readlines" and "print"

推荐答案

弗洛里安的答案很好并且易于使用，我绝对建议您这样做！但是如果您热衷于使用提示作为输入，我会添加另一个解决方案，使用 javaScript ：

Florian's answer is nice and easy to use, I would definitely recommend that! But in case you are keen on using prompts for inputs I am adding another solution, using javaScript:

当用户按下 actionButton 并存储时，它显示提示它在输入变量中。 （不一定必须在按下按钮后）

This one shows a prompt when the user presses an actionButton and stores it in an input variable. (it doesn't necessarily have to be after a button press)

library(shiny)

ui <- fluidPage(
  tags$head(tags$script("
    $(document).on('shiny:inputchanged', function(event) {
      if (event.name === 'go') {
        var text = prompt('Write me something nice:');
        Shiny.onInputChange('mytext', text);
      }
    });"
  )),
  actionButton("go", "Click for prompt"),
  textOutput("txt")
)

server <- function(input, output, session) {
  output$txt <- renderText( {
    input$mytext
  })
}

shinyApp(ui, server)

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