闪亮的DT表中的限制行选择 [英] Limit row selection in DT Table in Shiny

问题描述

我目前正在尝试将我在Shiny中的数据表中的选择限制为只有两行-我希望该表不允许用户单击多于几行（但也可以在以后取消选择它们）。 / p>

I am currently trying to limit my selection in a DataTable in Shiny to just two rows - I want the table to not allow the user to click on more than rows (but also to have the ability to deselect them afterwards).

library(DT)
shinyApp(
  ui = fluidPage(
    fluidRow(
      column(12,
             dataTableOutput('table')
      )
    )
  ),
  server = function(input, output) {
    output$table <- DT::renderDataTable(iris, 
                                    options = list(selection = "multiple")
    )
  }
)

行选择当前处于多种模式，可以使用，但是我不希望选择超过两行。

The row selection is currently on multiple mode, which works, but I don't want the selection to exceed two rows.

推荐答案

您可以通过已经解决过的javascript来解决它：
限制行选择到数据表中的3

You could either solve it via javascript, which you may have seen already: Limit row selection to 3 in datatables

或者您在Shiny中更新数据表：

Or you update the datatable in Shiny:

library(DT)
library(shiny)
shinyApp(
  ui = fluidPage(
    fluidRow(
      column(12,dataTableOutput('tbl'))
    )
  ),
  server = function(input, output) {
    reset <- reactiveValues(sel = "")
    output$tbl <- DT::renderDataTable({
      input$tbl_rows_selected
      datatable(iris, selection = list(mode = 'multiple', selected = reset$sel))
    })

    observe({
      if(length(input$tbl_rows_selected) > 2){
        reset$sel <- setdiff(input$tbl_rows_selected, input$tbl_row_last_clicked)
      }else{
        reset$sel <- input$tbl_rows_selected
      }
    })
  }
)

此解决方案可能不太干净，但更容易理解。

This solution might be less clean, but a bit easier to understand.

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