Question

我有一个简单的闪亮应用程序，它显示了虹膜数据集的散点图。在该图下有一个显示数据的表格。我想知道是否有可能以某种方式将图表以及侧栏菜单与表格连接起来，以便仅显示在该特定页面中显示的数据。

#ui.r
pageWithSidebar(
  headerPanel('Iris k-means clustering'),
  sidebarPanel(
    selectInput('xcol', 'X Variable', names(iris)),
    selectInput('ycol', 'Y Variable', names(iris),
                selected=names(iris)[[2]]),
    numericInput('clusters', 'Cluster count', 3,
                 min = 1, max = 9)
  ),
  mainPanel(
    plotOutput('plot1'),
    DT::dataTableOutput('contents')
  )
)
#server.r
library(shiny)
library(DT)
function(input, output, session) {

  # Combine the selected variables into a new data frame
  selectedData <- reactive({
    iris[, c(input$xcol, input$ycol)]
  })

  clusters <- reactive({
    kmeans(selectedData(), input$clusters)
  })

  output$plot1 <- renderPlot({
    palette(c("#E41A1C", "#377EB8", "#4DAF4A", "#984EA3",
              "#FF7F00", "#FFFF33", "#A65628", "#F781BF", "#999999"))

    par(mar = c(5.1, 4.1, 0, 1))
    plot(selectedData(),
         col = clusters()$cluster,
         pch = 20, cex = 3)
    points(clusters()$centers, pch = 4, cex = 4, lwd = 4)
  })
  output$contents <- renderDataTable({
    selectedData()
  })
}

Answer 1

您需要input$tableId_rows_current来提供当前页面上的行索引。有关更多信息，请查看DT documentation。这是更新的代码-

output$plot1 <- renderPlot({
  req(input$contents_rows_current)
  palette(c("#E41A1C", "#377EB8", "#4DAF4A", "#984EA3",
            "#FF7F00", "#FFFF33", "#A65628", "#F781BF", "#999999"))

  par(mar = c(5.1, 4.1, 0, 1))
  plot(selectedData()[input$contents_rows_current, ],
       col = clusters()$cluster,
       pch = 20, cex = 3)
  points(clusters()$centers, pch = 4, cex = 4, lwd = 4)
})

通过从数据表中选择另一页来更新图

1 个答案: