R - 更改闪亮按钮的标签并计算点击次数

Question

我试图切换显示/隐藏列按钮的标签，并跟踪单击它的次数，以更改表显示的列数。我做到了，但我不能使用计数器值的直接偶数/奇数区分。相反，我不得不使用它：(vars$counter+1)/2) %% 2 == 0)使其工作，因为每次单击都会更改计数器 2 次。我想要求一个更简单的程序，也许有一个闪亮的BS？

## app.R ##
library(shiny)
library(shinydashboard)
library(DT)
body<-dashboardBody(
  textOutput("count"),
  uiOutput('showallcolumnsbutton'),
  DT::dataTableOutput('table2')
)
ui <- dashboardPage(
  dashboardHeader(),
  dashboardSidebar(),
  body
)
server <- function(input, output) {
  table<-data.frame(replicate(10,sample(0:1,1000,rep=TRUE)))
  vars<-reactiveValues()
  vars = reactiveValues(counter = 0)
  observe({
    if(!is.null(input$showallcolumns)){
      input$showallcolumns
      isolate({
        vars$counter <- vars$counter + 1
      })
    }
  })
  label <- reactive({
    if(!is.null(input$showallcolumns)){
      if( ( (vars$counter+1)/2) %% 2 == 0) label <- "Hide"
      else label <- "Show"
    }
  })
  output$showallcolumnsbutton <- renderUI({
    actionButton("showallcolumns", label = label(),
                 icon("hand-pointer-o"),
                 style="color: #000; background-color: #0099ff; border-color: #2e6da4" 
    )
  })
  output$count<-renderText({paste("counter value:",vars$counter)})
  columnstoshow = reactive ({
    x=  ((vars$counter+1)/2) # %% 2 == 0)
    if (!is.null (x))
    {
      if (x %% 2 == 0) {
        c=c(1:10)
      }
      else {
        c=c(1:5)
      }
    } #end 1st if
    else {
      c=c(1:10)
    }
  })
  output$table2 = DT::renderDataTable({
    DT::datatable(table[, columnstoshow()])
  })
} # end server
shinyApp(ui, server)

Answer 1

既然我不是 100% 你想要的，是这样吗？请注意，我使用了其他库，例如shinyBS

rm(list = ls())
library(shiny)
library(shinydashboard)
library(DT)
library(shinyBS)
body <- dashboardBody(bsButton("showallcolumns", label = "Hide", block = F, style="danger",icon=icon("hand-pointer-o")),br(),DT::dataTableOutput('table2'))
ui <- dashboardPage(dashboardHeader(),dashboardSidebar(),body)
server <- function(input, output,session) {
  table <- data.frame(replicate(10,sample(0:1,1000,rep=TRUE)))
  vars <- reactiveValues(counter = 1:10)
  observeEvent(input$showallcolumns,{
    if(input$showallcolumns %% 2){
      updateButton(session, "showallcolumns",label = "Show", block = F, style = "success",icon=icon("hand-pointer-o")) 
      vars$counter <- 1:5
    }
    else{
      updateButton(session, "showallcolumns",label = "Hide", block = F, style = "danger",icon=icon("hand-pointer-o"))    
      vars$counter <- 1:10
    }                                                                                                                        
  })  
  output$table2 = DT::renderDataTable({
    DT::datatable(table[, vars$counter])
  })
} # end server
shinyApp(ui, server)