在R Shiny中更改d3heatmapOutput()的高度

时间:2016-05-18 12:44:07

标签: r shiny d3heatmap

我正在使用R的d3heatmap库构建热图:https://cran.r-project.org/web/packages/d3heatmap/d3heatmap.pdf

我希望能够允许用户在height =函数中自由调整(通过UI)d3heatmapOutput()参数。

比较以下两个代码段(只是将它们直接复制/粘贴到R Studio中),其中唯一的区别是height =d3heatmapOutput()参数的值:

library(d3heatmap)
library(shiny)
ui <- fluidPage(
  h1("A heatmap demo"),
  selectInput("palette", "Palette", c("YlOrRd", "RdYlBu", "Greens", "Blues")),
  checkboxInput("cluster", "Apply clustering"),
  d3heatmapOutput("heatmap", height = "400px")
  )
server <- function(input, output, session) {
  output$heatmap <- renderD3heatmap({
    d3heatmap(
      scale(mtcars),
      colors = input$palette,
      dendrogram = if (input$cluster) "both" else "none"
) })
    }
    shinyApp(ui, server)

VS。

library(d3heatmap)
library(shiny)
ui <- fluidPage(
  h1("A heatmap demo"),
  selectInput("palette", "Palette", c("YlOrRd", "RdYlBu", "Greens", "Blues")),
  checkboxInput("cluster", "Apply clustering"),
  d3heatmapOutput("heatmap", height = "1000px")
  )
server <- function(input, output, session) {
  output$heatmap <- renderD3heatmap({
    d3heatmap(
      scale(mtcars),
      colors = input$palette,
      dendrogram = if (input$cluster) "both" else "none"
) })
    }
    shinyApp(ui, server)

我想让用户自己选择height =的这个值。但是,由于"400px"是非数字参数,因此numericInput()等UI工具不起作用。同样,selectInput()也不起作用,例如:

selectInput("foo", "Bar:", c("400px", "700px", "1000px"))

其中d3heatmapOutput("heatmap", height = "foo")。不幸的是,这些选项都不起作用,这让我想知道我是否可能忽略了一个更简单,更优雅的选择。

1 个答案:

答案 0 :(得分:2)

在此示例中,您可以使用滑块控制绘图的高度。我们的想法是在服务器端渲染地图,并使用paste0函数设置所需的大小(以像素为单位)。

library(d3heatmap)
library(shiny)
ui <- fluidPage(
  h1("A heatmap demo"),


  sliderInput("pixels", "size", value = 400, min = 100, max = 1000),

  selectInput("palette", "Palette", c("YlOrRd", "RdYlBu", "Greens", "Blues")),
  checkboxInput("cluster", "Apply clustering"),
  uiOutput("dynamic")
)
server <- function(input, output, session) {
  output$heatmap <- renderD3heatmap({
    d3heatmap(
      scale(mtcars),
      colors = input$palette,
      dendrogram = if (input$cluster) "both" else "none"
    ) })

  output$dynamic <- renderUI({

    d3heatmapOutput("heatmap", height = paste0(input$pixels, "px"))
  })

}
shinyApp(ui, server)