RStudio Shiny 动态选择

Question

在我的 RStudio Shiny 中，我在 server.R 中得到了 selectInput，在 ui.R 上我得到了 Tags 语句来更改选择框的宽度和高度。

它在页面加载时起作用，但当我进入单一类型时它会恢复为默认大小。有什么想法如何解决吗？

在 ui.R 上

# [...]
  ,div(class="span6"
   ,radioButtons("viz_multiple", "Select Type:",
          c("Select From List (can use Up/Down + Enter)" = "multiple",
            "Search One (Delete then type keyword)"  = "single")
    )
   )
  )
  ,div(class='row-fluid'
  ,div(class='span12', uiOutput("image_list"))
  ,tags$head(tags$style(type="text/css", "select#iimage_list             { width: 1000px; height: 40px; }"))
  )
 # [...]

在服务器上。R

# [...]

output$image_list <- renderUI({
  imagelist = image_ls()
  iimage_list <- as.vector(sort(unique(as.character(imagelist)),decreasing=TRUE))
  length_list = length(iimage_list)
  selectInput("iimage_list",paste0("samples (",length_list,")"),choices=iimage_list, selectize = input$viz_multiple == 'single')
})
# [...]

当用户从多个切换到单个时，有什么想法如何应用tags命令吗？

Answer 1

您还需要动态添加 css。要定位 selectize 输入，您需要定位 select#dataset + .selectize-control 而不是 select#dataset

图书馆( Shiny )

runApp(list(
  ui = bootstrapPage(
    radioButtons("viz_multiple", "Select Type:",
                 c("Select From List (can use Up/Down + Enter)" = "multiple",
                   "Search One (Delete then type keyword)"  = "single")
    )
    , uiOutput("myUI")
  ),
  server = function(input, output){
    output$myUI <- renderUI({
      myCSS <-if(input$viz_multiple == 'single'){
        tags$style(type="text/css", "select#dataset + .selectize-control{ width: 1000px; height: 40px; }")
      }else{
        tags$style(type="text/css", "select#dataset { width: 1000px; height: 40px; }")
      }
      tagList(
        selectInput('dataset', 'Choose Dataset', c('mtcars', 'iris'), selectize = (input$viz_multiple == 'single'))
        , myCSS
      )
    })
  }
))

或者有两个单独的CSS条目，一个用于select，一个用于selectize:

library(shiny)
runApp(list(
  ui = bootstrapPage(
    radioButtons("viz_multiple", "Select Type:",
                 c("Select From List (can use Up/Down + Enter)" = "multiple",
                   "Search One (Delete then type keyword)"  = "single")
    )
    , uiOutput("myUI")
    , tags$style(type="text/css", "select#dataset + .selectize-control{ width: 1000px; height: 40px; }")
    , tags$style(type="text/css", "select#dataset { width: 1000px; height: 40px; }")
  ),
  server = function(input, output){
    output$myUI <- renderUI({
      selectInput('dataset', 'Choose Dataset', c('mtcars', 'iris'), selectize = (input$viz_multiple == 'single'))
    })
  }
))