Question

我有这个基本的闪亮应用程序，它在“查看器”中非常快速，但是当我使用“在浏览器中打开”时＃39;选项，选择输入选项需要一段时间才能加载。

selectList <- sapply(1:15000, function(x) paste(sample(letters, 10), collapse = ''))
ui <- fluidPage(
  selectInput('mylist', 'Select Something',
              choices = c(Choose = '', selectList),
              selected = 1)
)

server <- function(input, output) {
}

shinyApp(ui = ui, server = server)

根据这个帖子 - https://groups.google.com/forum/#!topic/shiny-discuss/doHpFM6ZOGg，这个问题在一些旧的私人分支中得到了解决。我正在使用的最新安装是这个，我看到了缓慢的问题。

packageVersion('shiny')
[1] ‘0.13.2’

我必须做出的任何选择都有不同的表现吗？

其他需求：

我还希望选择的输入依赖于单选按钮输入，如下所示。但是，出于某种原因，我无法使服务器端选择输入以使用单选按钮上的observeEvent。对我做错了什么的想法？

# mylist
selectList1 <- sapply(1:15000, function(x) paste0(x, "_", paste(sample(LETTERS, 10), collapse = '')))
selectList2 <- sapply(1:15000, function(x) paste0(x, "_", paste(sample(letters, 10), collapse = '')))

# ui
ui <- fluidPage(
  selectizeInput(
    inputId = 'mylist', label = 'Select Something',
    choices = NULL,
    selected = 1
  ),
  radioButtons('letterType',
               'Select a Letter Type:',
               choices = c('Upper Case' = 'upper',
                           'Lower Case' = 'lower'),
               selected = 'upper',
               inline = TRUE)
)

# server
server <- function(input, output, session) {
  selectListReactive <- reactive({
    validate(need(is.null(input$letterType), FALSE))
    if (input$letterType == 'upper')
      selectList1
    else
      selectList2
  })
  observeEvent(input$letterType, {
    updateSelectizeInput(session = session, inputId = 'mylist',
                         choices = c(Choose = '', selectListReactive()),
                         server = TRUE)
  })
}

# app
shinyApp(ui = ui, server = server)

Answer 1

您尝试使用updateSelectizeInput将选项放在服务器中并使用server = TRUE存储服务器端的选项，例如：

library("shiny")
# mylist
selectList <- sapply(1:15000, function(x) paste0(x, "_", paste(sample(letters, 10), collapse = '')))
# ui
ui <- fluidPage(
  selectizeInput(
    inputId = 'mylist', label = 'Select Something',
    choices = NULL,
    selected = 1
  )
)
# server
server <- function(input, output, session) {
  updateSelectizeInput(session = session, inputId = 'mylist', choices = c(Choose = '', selectList), server = TRUE)
}
# app
shinyApp(ui = ui, server = server)

您必须使用selectizeInput而不是selectInput来实现此目的

Answer 2

我使用 data.table 包快速完成了这项工作：

library(data.table)
selectList <- as.data.table(sapply(1:15000, function(x) paste(sample(letters, 10), collapse = '')))
ui <- fluidPage(
  selectInput('mylist', 'Select Something',
              choices = c(Choose = '', selectList),
              selected = 1)
)

server <- function(input, output) {
}

shinyApp(ui = ui, server = server)

值得

浏览器

2 个答案: