选择显示所有项目的下拉列表

Question

我有一个我无法解决的小问题。我认为解决方案非常简单，而且我对 java 语言的了解不多。这是一个小例子：

library(shiny)

ui <- (fluidPage(
  sidebarLayout(
    sidebarPanel(
      selectInput("userInput","Select User", c(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21),
                  selected=1),
      selectInput("LongInput", "Long Strings", c("This is a long long string that is long.",
                                                 "This is a long long string that is longer."))
    ),

    # allows for long texts to not be wrapped, and sets width of drop-down
    tags$head(
      tags$style(HTML('
                      .selectize-input {
                      white-space: nowrap;
                      }
                      #LongInput + div>.selectize-dropdown{
                      width: 660px !important;
                      }
                      #userInput + div>.selectize-dropdown{
                                            width: 357px !important; maxItems: 21;
                      }
                      '
              )
      )
      )
      )
      ))

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

shinyApp(ui, server)

当用户单击第一个 selectInput 以进行选择时，我不想显示列表的前七个元素，而是显示列表的所有元素。谢谢

Answer 1

我认为 shinyWidgets 软件包是您所需要的。它有一个 pickerInput 将显示所有选项

#install.packages("shinyWidgets")
library(shiny)
library(shinyWidgets)

ui <- fluidPage(
  sidebarLayout(
    sidebarPanel(
      pickerInput("userInput", label = "Select User", choices = 1:21, options = list(style = "btn-primary")),
      selectInput("LongInput", "Long Strings", c("This is a long long string that is long.",
                                                 "This is a long long string that is longer."))
    ),mainPanel()
  )
)

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

shinyApp(ui, server)

Answer 2

您可以使用 css tags$style(type='text/css', ".selectize-dropdown-content {max-height: 1000px !important; }") 来做到这一点

像这样：

ui <- (fluidPage(
  tags$style(type='text/css', ".selectize-dropdown-content {max-height: 1000px !important; }"), 
  sidebarLayout(
    sidebarPanel(
      selectInput("userInput","Select User", c(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21),
                  selected=1),
      selectInput("LongInput", "Long Strings", c("This is a long long string that is long.",
                                                 "This is a long long string that is longer."))
    ),


    # allows for long texts to not be wrapped, and sets width of drop-down
    tags$head(
      tags$style(HTML('
                      .selectize-input {
                      white-space: nowrap;
                      }
                      #LongInput + div>.selectize-dropdown{
                      width: 660px !important;
   }
                      #userInput + div>.selectize-dropdown{
                      width: 357px !important; maxItems: 21;
                      }
                      '
      )
      )
      )
      )
      ))

你得到：

选择显示所有项目的下拉列表

Selectize dropdown showing all items

java

css

shiny

dropdown

selectize.js