闪亮的情节不显示数据

Question

我正在尝试构建一个闪亮的应用程序，以显示 10 个受影响最严重的国家的 COVID-19 病例，并每天从 ECDC 网站更新。我希望能够使用滑块输入来限制病例和死亡人数，并使用日期输入选择日期期间（所有已添加）。 代码如下，但是当我运行应用程序时，我得到一个空白图，轴显示正确，但我无法让点出现。这应该能够在任何计算机上运行，​​因为代码只是从 ECDC 页面下载数据集。 有什么解决办法吗？

library(shiny)
library(readxl)
library(dplyr)
library(httr)
library(ggplot2)
library(plotly)

url <- paste("https://www.ecdc.europa.eu/sites/default/files/documents/COVID-19-geographic-disbtribution-worldwide-",format(Sys.time(), "%Y-%m-%d"), ".xlsx", sep = "")

GET(url, authenticate(":", ":", type="ntlm"), write_disk(tf <- tempfile(fileext = ".xlsx")))

data <- read_excel(tf)

include<-c("United_Kingdom","Italy","France","China",
           "United_States_of_America","Spain","Germany",
           "Iran","South_Korea","Switzerland")
ui <- fluidPage(

    titlePanel("COVID-19 Daily Confirmed Cases & Deaths"),

    sidebarLayout(
        sidebarPanel(
            checkboxGroupInput("Country", "Select Country", selected = NULL, inline = FALSE,
                         width = NULL),
            dateRangeInput("DateRep","Select Date Range", start = "2019-12-31", end = NULL),
            sliderInput("Cases","Select Cases Range", min = 1, max = 20000, value = NULL),
            sliderInput("Deaths", "Select Death Range", min = 1, max = 10000, value = 100),
            submitButton("Refresh")


        ),

        mainPanel(
           plotOutput("plot")
        )
    )
)

server <- function(input, output) {

    output$plot <- renderPlot({

        include<-input$Country

        plot_data<-filter(data, `Countries and territories` %in% include)%>%
            filter(between(input$Cases))

        plot_data%>% ggplot(aes(x=input$DateRep, y=input$Cases, size =input$Deaths, color = input$Country)) +
            geom_point(alpha=0.5) +
            theme_light()

    })
}

shinyApp(ui = ui, server = server)

Answer 1

我认为在renderPlot 之外的reactive 表达式中定义和过滤要绘制的数据会更好。它将允许您更轻松地重用这些数据，并且（从我的角度来看）更容易使用 ggplot 而无需直接在其中输入。

我在filter 中包含as.Date(DateRep) >= input$DateRep[1] & as.Date(DateRep) <= input$DateRep[2]) 以选择两个选定日期之间的间隔。由于DateRep 列具有POSIXct 格式，因此您需要在其上使用as.Date 将其转换为dateRangeInput 生成的格式。

结果如下：

library(shiny)
library(readxl)
library(dplyr)
library(httr)
library(ggplot2)
library(plotly)

url <- paste("https://www.ecdc.europa.eu/sites/default/files/documents/COVID-19-geographic-disbtribution-worldwide-",format(Sys.time(), "%Y-%m-%d"), ".xlsx", sep = "")

GET(url, authenticate(":", ":", type="ntlm"), write_disk(tf <- tempfile(fileext = ".xlsx")))

data <- read_excel(tf)

include<-c("United_Kingdom","Italy","France","China",
           "United_States_of_America","Spain","Germany",
           "Iran","South_Korea","Switzerland")
ui <- fluidPage(

  titlePanel("COVID-19 Daily Confirmed Cases & Deaths"),

  sidebarLayout(
    sidebarPanel(
      checkboxGroupInput("Country", "Select Country", choices = include, selected = "France"),
      dateRangeInput("DateRep","Select Date Range", start = "2019-12-31", end = NULL),
      sliderInput("Cases","Select Cases Range", min = 1, max = 20000, value = NULL),
      sliderInput("Deaths", "Select Death Range", min = 1, max = 10000, value = 100),
      submitButton("Refresh")

    ),

    mainPanel(
      plotOutput("plot")
    )
  )
)

server <- function(input, output) {

  plot_data <- reactive({
    filter(data, `Countries and territories` %in% input$Country 
           & as.Date(DateRep) >= input$DateRep[1]
           & as.Date(DateRep) <= input$DateRep[2]) %>%
       filter(between(Cases, 1, input$Cases))
  })

  output$plot <- renderPlot({
    plot_data() %>% 
      ggplot(aes(x = as.Date(DateRep), y= Cases, size = Deaths, color = `Countries and territories`)) +
      geom_point(alpha=0.5) +
      theme_light()
  })
}

shinyApp(ui = ui, server = server)

Answer 2

我开始解决这个问题，但是没时间了...所以这就是我所做的，也许您可​​以完成它...

library(shiny)
library(readxl)
library(dplyr)
library(httr)
library(ggplot2)
library(plotly)

url <- paste("https://www.ecdc.europa.eu/sites/default/files/documents/COVID-19-geographic-disbtribution-worldwide-",format(Sys.time(), "%Y-%m-%d"), ".xlsx", sep = "")

GET(url, authenticate(":", ":", type="ntlm"), write_disk(tf <- tempfile(fileext = ".xlsx")))

data <- read_excel(tf)

ui <- fluidPage(

  titlePanel("COVID-19 Daily Confirmed Cases & Deaths"),

  sidebarLayout(
    sidebarPanel(
      uiOutput("country_checkbox"),
      dateRangeInput("DateRep","Select Date Range", start = "2019-12-31", end = NULL),
      sliderInput("Cases","Select Cases Range", min = 1, max = 20000, value = NULL),
      sliderInput("Deaths", "Select Death Range", min = 1, max = 10000, value = 100)
      #submitButton("Refresh")


    ),

    mainPanel(
      plotOutput("plot")
    )
  )
)

server <- function(input, output) {

  output$country_checkbox <- renderUI({
    countries <- unique(data.frame(data)[, "Countries.and.territories"])
    checkboxGroupInput("country", "Select Country", 
                       choices = countries,
                       selected = NULL, inline = FALSE,
                       width = NULL)
  })

  output$plot <- renderPlot({

    include<-input$country

    plot_data<-filter(data, `Countries and territories` %in% include)%>%
      filter(between(Cases, 1, input$Cases))

    plot_data%>% ggplot(aes(x=DateRep, y=Cases, size =Deaths, color = `Countries and territories`)) +
      geom_point(alpha=0.5) +
      theme_light()

  })
}

shinyApp(ui = ui, server = server)