根据 R Shiny 中的其他选择动态更新两个 selectInput 框

Question

我正在开发一个闪亮的应用程序并且有两个选择输入框。他们都接受相同的输入，我想根据对方的选择更新输入框。

基本上我想删除一个输入框上的选定变量，而另一个输入框的下拉列表不可用。

vars <- c("A", "B", "C", "D", "E", "F", "G", "H")

selectInput("v1", label = "Select Variable 1", choices = vars),
selectInput("v2", label = "Select Variable 2", choices = vars)

在上面的示例中，如果用户选择选项 A 作为“V1”，我想从 v2 可用的选项中删除 A，反之亦然。我已尝试执行以下操作但未成功

  observe({
    updateSelectInput(session, "v1", choices = vars)
  })

observe({
        updateSelectInput(session, "v2", choices = vars)
  })

Answer 1

您可以通过使用每个输入来过滤其他输入中的选择来实现此目的：

library(shiny)
my_vars <- c("A", "B", "C", "D", "E", "F", "G", "H")


ui <- fluidPage(
  selectInput("v1", label = "Select Variable 1", choices = my_vars, multiple = TRUE),
  selectInput("v2", label = "Select Variable 2", choices = my_vars, multiple = TRUE)
  
)

server <- function(input, output, session){
  observe({
    if(!is.null(input$v2))
      updateSelectInput(session, "v1", 
                        choices = my_vars[!(my_vars %in% input$v2)], 
                        selected = isolate(input$v1) )
  })
  
  observe({
    if(!is.null(input$v1))
      updateSelectInput(session, "v2", 
                        choices = my_vars[!(my_vars %in% input$v1)], 
                        selected = isolate(input$v2) )
  })
}

shinyApp(ui = ui, server = server)

注意使用 isolate 以避免在选择之间关闭列表

如果您不想进行多项选择，请使用不同的选择初始化每个输入：

ui <- fluidPage(
  selectInput("v1", label = "Select Variable 1", choices = my_vars, selected = "A"),
  selectInput("v2", label = "Select Variable 2", choices = my_vars, selected = "B")
)

根据 R Shiny 中的其他选择动态更新两个 selectInput 框

Dynamically update two selectInput boxes based on the others selection in R Shiny

r

shiny

selectinput