R Future Error：尝试在NULL上设置属性

Question

我想从将来更新SelectizeInput，但我收到此错误：

＆＃34;尝试在NULL＆＃34;

上设置属性

以下是一个例子：

library(shiny)
library(future)

plan(transparent)

ui <- fluidPage(# client side selectize
  selectizeInput("currentCountry", "Countries : ", choices = NULL))


server <- function(input, output, session) {
  repeat {
    countriesFuture <- future({
      rtweet::stream_tweets(timeout = 20)
    })
    updateCountries <- future({
      worldTweets<- value(countriesFuture)
      updateSelectizeInput("currentCountry",
                           "New Countries : ",
                           choices = worldTweets$country)
    })
  }
}

shinyApp(ui, server)

Answer 1

我猜您需要将会话添加到updateSelectizeInput，所以它变为如下：  updateSelectizeInput(session, "currentCountry", choices = worldTweets$country)