在 Shiny 中使用迷你图渲染数据表

Question

我想在闪亮的 DT 中包含迷你图。它在 RStudio 查看器中运行良好，但在 Shiny 中不会呈现迷你图。这是一个最小的例子。

# dependencies
  require(sparkline)
  require(DT)
  require(shiny)

# create data with sparklines
  spark_data <- data.frame(
    id = c('spark1', 'spark2'),
    spark = c(
      spk_chr(values = 1:3, elementId = 'spark1'),
      spk_chr(values = 3:1, elementId = 'spark2')
    )
  )

# render in RStudio viewer (this works)
  tbl <- datatable(spark_data, escape = FALSE)
  spk_add_deps(tbl)

# render in Shiny (no sparklines rendered in DT)
  ui <- fluidPage(
      sparklineOutput("test_spark"),
      dataTableOutput("tbl")
  )

  server <- function(input, output) {
    # sparkline outside DT (works fine) - also ensures sparkline dependencies are attached
      output$test_spark <- renderSparkline(sparkline(1:3))

    # sparkline inside DT (does not render)
      output$tbl <- renderDataTable(
        expr = spark_data,
        escape = FALSE
      )
  }

  shinyApp(ui = ui, server = server)

Answer 1

我已修改您的代码以生成迷你图。我参考了这个 link 来生成迷你图。

require(sparkline)
require(DT)
require(shiny)

# create data
spark_data1<- data.frame(id = c('spark1', 'spark2'),
                          spark = c("1,2,3", "3,2,1"))



ui <- fluidPage(
  sparklineOutput("test_spark"),
  DT::dataTableOutput("tbl")
)

server <- function(input, output) {

  line_string <- "type: 'line', lineColor: 'black', fillColor: '#ccc', highlightLineColor: 'orange', highlightSpotColor: 'orange'"

  cd <- list(list(targets = 1, render = JS("function(data, type, full){ return '<span class=sparkSamples>' + data + '</span>' }")))

  cb = JS(paste0("function (oSettings, json) {\n  $('.sparkSamples:not(:has(canvas))').sparkline('html', { ", 
                 line_string, " });\n}"), collapse = "")

  output$tbl <- DT::renderDataTable({
    dt <-  DT::datatable(as.data.frame(spark_data1),  rownames = FALSE, options = list(columnDefs = cd,fnDrawCallback = cb))
  })
}

shinyApp(ui = ui, server = server)

希望对您有所帮助！

Answer 2

我知道这是个老问题，但是根据问题中的信息我认为解决方案就是您最初尝试的方法加上几行。在这里，我剪掉了它在查看器中工作的部分演示，并添加了使迷你图工作所需的部分。

# dependencies
require(sparkline)
require(DT)
require(shiny)

# create data with sparklines
spark_data <- data.frame(
  id = c('spark1', 'spark2'),
  spark = c(
    spk_chr(values = 1:3, elementId = 'spark1'),
    spk_chr(values = 3:1, elementId = 'spark2')
  )
)

###  adding this <------------
cb <- htmlwidgets::JS('function(){debugger;HTMLWidgets.staticRender();}')

ui <- fluidPage(
  ###  and this <------------
  htmlwidgets::getDependency('sparkline'),
  dataTableOutput("tbl")
)

server <- function(input, output) {

  output$tbl <- renderDataTable(
    expr = spark_data,
    escape = FALSE,
    ###  and this <------------
    options = list(
      drawCallback =  cb
    )
  )
}

shinyApp(ui = ui, server = server)

在 Shiny 中使用迷你图渲染数据表

Render datatable with sparklines in Shiny

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