有没有一种方法可以显示在 Shiny 中构建的地块，而不是等待所有地块?

问题描述

我有一个带有许多情节的闪亮仪表板，所有这些都需要几秒钟的时间来构建.一旦最后一个构建，它们都会显示.相反，我希望每个情节在完成后立即显示.我知道 R 是单线程的，但似乎必须有一种方法可以将执行返回到显示代码"或类似的东西.

I have a Shiny Dashboard with many plots, all of which take multiple seconds to build. Once the last one builds, they all display. I would like instead for each plot to display as soon as it completes. I understand R is single-threaded, but it seems as though there must be a way to "return execution to the display code" or something like that.

这段代码演示了这个问题:

This code demonstrates the issue:

library(shiny)

ui <- fluidPage(
  title = "Page loading test"
  , h1("Page loading test")
  , plotOutput("plot1")
  , plotOutput("plot2")
  , plotOutput("plot3")
  , plotOutput("plot4")
)

server <- function(input, output) {
   output$plot1 <- renderPlot({
     Sys.sleep(10)
     plot(rnorm(50))
   })

   output$plot2 <- renderPlot({
     Sys.sleep(10)
     plot(rnorm(50))
   })

   output$plot3 <- renderPlot({
     Sys.sleep(10)
     plot(rnorm(50))
   })

   output$plot4 <- renderPlot({
     Sys.sleep(10)
     plot(rnorm(50))
   })
}

shinyApp(ui = ui, server = server)

睡眠只是为了模拟缓慢的执行.

页面显示需要 40 秒.我希望页面花 10 秒来显示 plot1，然后再花 10 秒来显示 plot2，等等.是否有像 UpdatePage() 这样的调用可以在每个绘图函数的底部调用?

It takes 40s for the page to display. I would like the page to take 10s to display plot1, then an additional 10s to display plot2, etc. Is there a call like UpdatePage() that can be called at the bottom of each plot function?

在我的页面上，我正在运行加载动画，因此用户知道活动正在发生，这使得它们在一次加载时更加明显.

On my page, I have loading animations running so the user is aware activity is occurring, which makes it even more obvious when they load at once.

当然，我可以有一个更简单的页面，但它不会是仪表板.:)

I could, of course, have a simpler page, but then it wouldn't be a dashboard. :)

推荐答案

你可以使用reactiveTimer()来定时刷新你的页面.

You can use reactiveTimer() to refresh your page regularly.

您可以将绘图保存在绘图的 list 中，以便在每次刷新时立即打印它们.

And you can save your plots in a list of plots to print them immediately at each refresh.

我不得不重新排序 renderPlot 函数，以便 step 迭代器一次只渲染一个绘图

I had to reorder the renderPlot functions so the step iterator only renders one plot at a time

我还选择不立即开始第一次渲染来绘制加载"图.

Also I chose not to start the first render right away to plot "Loading" plots.

library(shiny)

ui <- fluidPage(
  title = "Page loading test"
  , h1("Page loading test")
  , plotOutput("plot1")
  , plotOutput("plot2")
  , plotOutput("plot3")
  , plotOutput("plot4")
)

# Loading plot
plot(-1:1, -1:1, type = "n", xlab = "", ylab = "")
text(0,0, "Loading",cex = 5)
loading <- recordPlot()

plotlist <- vector("list",4)
step <- 0 # which plot should be rendered next

server <- function(input, output, session) {
  autoInvalidate <- reactiveTimer(10, session)
  output$plot4 <- renderPlot({autoInvalidate();
    if(step>4){plotlist[[4]]}
    else if(step==4){step <<- step+1
    print("rendering step 4")
    Sys.sleep(10)
    plotlist[[4]] <<- {plot(rnorm(50));recordPlot()}} else loading
  })
  output$plot3 <- renderPlot({autoInvalidate();
    if(step>3){plotlist[[3]]}
    else if(step==3){step <<- step+1
    print("rendering step 3")
    Sys.sleep(10)
    plotlist[[3]] <<- {plot(rnorm(50));recordPlot()}} else loading
  })
  output$plot2 <- renderPlot({autoInvalidate();
    if(step>2){plotlist[[2]]}
    else if(step==2){step <<- step+1
    print("rendering step 2")
    Sys.sleep(10)
    plotlist[[2]] <<- {plot(rnorm(50));recordPlot()}} else loading
  })
  output$plot1 <- renderPlot({autoInvalidate();
    if(step>1){plotlist[[1]]}
    else if(step==1){step <<- step+1
    print("rendering step 1")
    Sys.sleep(10)
    plotlist[[1]] <<- {plot(rnorm(50));recordPlot()}} else {step <<-1;loading}
  })
}
shinyApp(ui = ui, server = server)

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