闪亮的改变按钮的数据输入

Posted 2023-03-24

【中文标题】闪亮的改变按钮的数据输入

【英文标题】：shiny Change data input of buttons

【发布时间】：2013-09-19 22:23:24

【问题描述】：

我有一个带有活动按钮的表单，问题是我想重置此表单中的按钮output$exampleFasta = 0 但它抛出异常，我该如何更改变量的数据？或者如果存在诸如 renderImage 之类的东西，可以为特定属性（如 id）提供信息。

index.html

<form class="span12 menu-med-upload">
  <div class="row-fluid">
   <h3>Upload File .fasta</h3>
   <div class="custom-input-file btn btn-inverse">
    <input type="file" size="1" name="fileFasta" id="fileFasta" class="input-file" />
    Select File
   </div>
   <img src="/static/img/check.png" class = "custom-input-check">
   <div class="span12"></div>
   <textarea class = "span12" rows  = "10" style="resize: none;" id="textAreaFasta">
   </textarea>
 </div>
 <button id="uploadFasta" type="button" class="btn btn-inverse action-button" >Upload  File</button>
 <button id="exampleFasta" type="button" class="btn btn-inverse action-button" >Example</button>
</form>

服务器.R

output$table <- renderText(
  if(input$exampleFasta != 0 && input$uploadFasta == 0)
    return(myRenderTable(matrixProteinExample(),"table",""))
  
  if(input$uploadFasta != 0)
    return(myRenderTable(matrixProtein(),"table",nameFile))   
  
)

用这样的东西改变。但这是错误的。

output$table <- renderText(
  if(input$exampleFasta != 0 && input$uploadFasta == 0)
    output$exampleFasta <- 0
    return(myRenderTable(matrixProteinExample(),"table",""))
  
  if(input$uploadFasta != 0)
    return(myRenderTable(matrixProtein(),"table",nameFile))   
  
)

【参考方案1】：

如果您询问如何判断最近单击了哪个 actionButton（如果有的话！），那么重置为 0 并不是解决问题的方法。而是这样做：

shinyServer(function(input, output, session) 

  # Create a reactiveValues object, to let us use settable reactive values
  values <- reactiveValues()
  # To start out, lastAction == NULL, meaning nothing clicked yet
  values$lastAction <- NULL
  # An observe block for each button, to record that the action happened
  observe(
    if (input$exampleFasta != 0) 
      values$lastAction <- 'example'
    
  )
  observe(
    if (input$uploadFasta != 0) 
      values$lastAction <- 'upload'
    )
  )

  # Then you can use values$lastAction in reactive expressions, outputs, etc.
  output$table <- renderText(
    if (is.null(values$lastAction))
      return(NULL)
    if (identical(values$lastAction, 'upload'))
      return(myRenderTable(matrixProtein(), "table", nameFile))
    if (identical(values$lastAction, 'example'))
      return(myRenderTable(matrixProteinExample(), "table", ""))
    stop("Unexpected value for lastAction: ", values$lastAction)
  )
)