如何在RShiny中启用和禁用Action按钮

Question

我正在开发一款闪亮的应用。我正面临一个问题。我有一个actionButton。只有当某些细节被填满时才应启用该按钮。例如，只有当TextOutput中的值完全为100时才应启用该按钮。如果没有，则应禁用该按钮。

require(shiny)
require(shinyjs)
#install.packages("shinyjs")

ui = fluidPage( useShinyjs(),
                inlineCSS(list('.lightpink' = "background-color: lightpink",'.red'   = "background-color: red", "textarea" = 'text-align: center', '#text3 ' = 'text-align: center')),

                fluidRow(
                  column(3,numericInput("count", "No. of boxes",value = 3, min = 2, max = 10),actionButton("View","view")
                  ),
                  column(3, actionButton("submit", "Complete"))
                ),
                fluidRow(uiOutput("inputGroup")),
                fluidRow(column(3,wellPanel(textOutput("text3")))),
                tags$style(type = 'text/css', "#submit {display:inline-block; width:75%;margin-top: 25px}")

)

# takes in two arguments
sumN <- function(a, x){
  a <- sum(a, as.numeric(x),na.rm=T)
  return(a)
}

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

  Widgets <- eventReactive(input$View,{ input_list <- lapply(1:(input$count),
                                                             function(i) {
                                                               inputName <- paste("id", i, sep = "")
                                                               textInputRow <- function (inputId,value) {
                                                                 textAreaInput(inputName,"", width = "200px", height = "43px", resize = "horizontal" )
                                                                 #numericInput(inputName,"",1,0,100)
                                                               }
                                                               column(4,textInputRow(inputName, "")) })
  do.call(tagList, input_list)},ignoreInit = T)

  output$inputGroup = renderUI({Widgets()})



  getvalues <- reactive({
    val <- 0
    for(lim in 1:input$count){
      observeEvent(input[[paste0("id",lim)]], { 
        updateTextAreaInput(session,paste0("id",lim), value = ({
          x =  as.numeric(input[[paste0("id",lim)]])
          if(!(is.numeric(x))){0}
          else if(!(is.null(x) || is.na(x))){
            if(x < 0){
              0 
            }else if(x > 100){
              100
            } else{
              return (isolate(input[[paste0("id",lim)]]))
            } 
          } 
          #else{0}
          else if((is.null(x) || is.na(x))){
            0
          } 
        })
        )
      })
      req(as.numeric(input[[paste0("id",lim)]]) >= 0 & as.numeric(input[[paste0("id",lim)]]) <= 100)
      val <- sumN(val,as.numeric(input[[paste0("id",lim)]]))
    }
    val
  })

  output$text3 <- renderText({
    #getvalues()
    # if(getvalues() > 100){
    #    0



    # }
    #else(getvalues())

    getvalues()

  })

  observeEvent(getvalues(), {
    nn <- getvalues()
    if(is.numeric(as.numeric(nn)) & !is.na(as.numeric(nn)) & nn == 100) {

      removeClass("text3", 'red')
      addClass('text3','lightpink')

    } else  { addClass('text3','red')}
  })

}

shinyApp(ui=ui, server = server)

这是使用的代码。任何人都可以帮我解决这个问题吗？

Answer 1

您需要在toggleState

中添加enable或disable / observeEvent组合

observeEvent(getvalues(), {

    nn <- getvalues()

    if(is.numeric(as.numeric(nn)) & !is.na(as.numeric(nn)) & nn == 100) {

      disable("View")
      removeClass("text3", "red")
      addClass("text3","lightpink")          

    } else  { 

      enable("View")
      addClass("text3","red")

    }

})