渲染带有标题/标题和预选行的闪亮数据表

Question

我正在尝试编写shiny app用于绘制xy数据的代码。每个xy点都与几个因素相关：

set.seed(1)
data.df <- data.frame(x = rnorm(1000), y = rnorm(1000),
                      sex = sample(c("F", "M"), 1000, replace = T),
                      age = sample(c("Y", "O"), 1000, replace = T),
                      group = sample(c("A", "B", "C", "D"), 1000, replace = T),
                      stringsAsFactors = F)

design.df <- data.frame(factor.name = c(c(rep("sex",2), rep("age",2), rep("group",4))),
                        factor.levels = c("F", "M","Y", "O","A", "B", "C", "D"), stringsAsFactors = F)

我希望用户能够根据在 in中使用的多行选择来对xydata( ) 进行子集化，其中默认选择是 的所有行。使用此代码效果很好：data.dfdesign.dfDT::renderDTrenderUIserverdesign.df

suppressPackageStartupMessages(library(dplyr))
suppressPackageStartupMessages(library(shiny))
suppressPackageStartupMessages(library(DT))

server <- function(input, output)
{
  output$design.idx <- renderUI({
    output$design.df <- DT::renderDT(design.df, server = TRUE, selection = list(mode = "multiple", selected = rownames(design.df)[1:nrow(design.df)]))
    DT::dataTableOutput("design.df")
  })

  xy.plot <- reactive({
    if(!is.null(input$design.df_rows_selected)){
      selected.design.df <- design.df[input$design.df_rows_selected,,drop = FALSE]
      selected.idx <- lapply(unique(selected.design.df$factor.name), function(f) which(data.df[,f] %in% dplyr::filter(selected.design.df, factor.name == f)$factor.levels)) %>%
        unlist() %>% unique()
      plot.df <- data.df[selected.idx,,drop=F]
      xy.plot <- suppressWarnings(plotly::plot_ly(marker = list(size = 3), type = 'scatter', mode = "markers", x = plot.df$x, y = plot.df$y, showlegend = FALSE) %>%
                                            plotly::layout(xaxis = list(zeroline = FALSE, showticklabels = FALSE, showgrid = FALSE), yaxis = list(zeroline = FALSE, showticklabels = FALSE, showgrid = FALSE)))
    } else{
      xy.plot <- NULL
    }
    return(xy.plot)
  })

  output$outPlot <- plotly::renderPlotly({
    xy.plot()
  })
}


ui <- fluidPage(
  titlePanel("Results Explorer"),
  sidebarLayout(
    sidebarPanel(
      uiOutput("design.idx")
    ),
    mainPanel(
      plotly::plotlyOutput("outPlot")
    )
  )
)

shinyApp(ui = ui, server = server)

但我还希望渲染的标题或说明文字datatable，所以我尝试替换：

output$design.df <- DT::renderDT(design.df, server = TRUE, selection = list(mode = "multiple", selected = rownames(design.df)[1:nrow(design.df)]))

和：

output$design.df <- DT::renderDT(datatable(design.df, caption = "Subset Selection"), server = TRUE, selection = list(mode = "multiple", selected = rownames(design.df)[1:nrow(design.df)]))

在这种情况下，selected = rownames(design.df)[1:nrow(design.df)]参数似乎被忽略，并且默认选择没有行。更改selected = rownames(design.df)[1:nrow(design.df)]为selected = 1:nrow(design.df)没有任何区别。

知道如何获取渲染表的标题或说明文字并将所有行作为预选默认值吗？

Answer 1

您必须将选择放入datatable对象中：

output$design.df <- DT::renderDT(
    datatable(design.df, 
        caption = "Subset Selection",  
        selection = list(mode = "multiple",  
                         selected = rownames(design.df)[1:nrow(design.df)])
        ), 
    server = TRUE)