问题描述
我在 rmarkdown 中创建了一个绘图，我试图通过使用 shiny 在 selectInPut 中使用 动态参数 重新创建它。由于字符串和非字符串类型，我遇到了一些问题，我想我无法弄清楚。
数据可在：https://raw.githubusercontent.com/johnsnow09/covid19-df_stack-code/main/vaccination_data.csv
rmarkdown 代码和绘图：
vaccination_data %>%
filter(date == max(date)) %>%
slice_max(order_by = total_vaccinations,n = 20) %>%
ggplot(aes(x = total_vaccinations,y = fct_reorder(location,total_vaccinations),col = continent)) +
geom_point() +
geom_errorbarh(height=0,size=1,aes(xmin=total_vaccinations,xmax=0)) +
scale_x_continuous(labels = unit_format(scale = 1e-6,unit = "M")) +
geom_vline(xintercept = 0,col = "midnightblue",lty = 2,size = 1) +
theme(
panel.grid.major = element_blank(),legend.position = "NULL")
在上面的代码中，我试图将 total_vaccinations 参数设置为动态的闪亮。
server.R：
output$top_vaccinating_countries <- renderPlot({
req(input$id_vaccination_top_country)
vaccination_data %>%
filter(date == max(date)) %>%
slice_max(order_by = input$id_vaccination_top_country,n = 20) %>%
ggplot(aes(x = input$id_vaccination_top_country,input$id_vaccination_top_country),col = continent)) +
geom_point() +
geom_errorbarh(height=0,aes(xmin=as.numeric(!! sym(input$id_vaccination_top_country)),xmax=0)) +
# scale_x_continuous(labels = unit_format(scale = 1e-6,unit = "M")) +
geom_vline(xintercept = 0,size = 1) +
scale_color_tableau() +
theme(
panel.grid.major = element_blank(),legend.position = "top",legend.direction = "horizontal")
})
用户界面：
column(4,style = "border: 1px solid gray;",selectInput(inputId = "id_vaccination_top_country",label = "Select Vaccination Parameter",choices = c("total_vaccinations","total_vaccinations_per_hundred","people_vaccinated","people_vaccinated_per_hundred"),selected = "total_vaccinations"),plotOutput("top_vaccinating_countries",height = "570px")
)
我尝试了 (!! sym(input$)) 的各种组合，但没有奏效。甚至尝试过 varSelectInput 但如果我这样做会产生另一个错误：
varSelectInput(
data = (vaccination_data %>% select(total_vaccinations,people_vaccinated))
更新用户界面：
library(shiny)
library(shinydashboard)
library(shinythemes)
library(highcharter)
library(streamgraph)
# library(thematic)
#
# thematic_shiny(font = "auto")
# Define UI for application
shinyUI(fluidPage(
theme=shinytheme("lumen"),themeSelector(),navbarPage(
title = "Covid19 Dashboard",id = "Covid19_Dashboard",tabPanel("Global Cases Status",# Application title
titlePanel("Global level"),fluidRow(
style = "border: 1px solid gray;",column(4,plotOutput("top_CFR_countries",height = "650px")),plotOutput("top_testing_countries",height = "650px")
),height = "570px")
)
)
) # navbarpage
) # fluid page
) # shiny ui
解决方法
有几个地方应该将字符串更改为 symbol 并求值 (!!)
library(shiny)
library(dplyr)
library(readr)
library(ggplot2)
library(ggthemes)
library(forcats)
library(scales)
-ui
# Define UI
vaccination_data <- read_csv("https://raw.githubusercontent.com/johnsnow09/covid19-df_stack-code/main/vaccination_data.csv")
ui <- fluidRow(
style = "border: 1px solid gray;",h3("Vaccination to Cases Correlation Analysis"),column(4,style = "border: 1px solid gray;",selectInput(inputId = "id_vaccination_top_country",label = "Select Vaccination Parameter",choices = c("total_vaccinations","total_vaccinations_per_hundred","people_vaccinated","people_vaccinated_per_hundred"),selected = "total_vaccinations"),plotOutput("top_vaccinating_countries",height = "570px")
)
)
-服务器
server <- function(input,output) {
output$top_vaccinating_countries <- renderPlot({
req(input$id_vaccination_top_country)
vaccination_data %>%
filter(date == max(date)) %>%
slice_max(order_by = !! rlang::sym(input$id_vaccination_top_country),n = 20) %>%
ggplot(aes(x = !! rlang::sym(input$id_vaccination_top_country),y = fct_reorder(location,!! rlang::sym(input$id_vaccination_top_country)),col = continent)) +
geom_point() +
geom_errorbarh(height=0,size=1,aes(xmin=as.numeric(!! sym(input$id_vaccination_top_country)),xmax=0)) +
scale_x_continuous(labels = unit_format(scale = 1e-6,unit = "M")) +
geom_vline(xintercept = 0,col = "midnightblue",lty = 2,size = 1) +
scale_color_tableau() +
theme(
panel.grid.major = element_blank(),legend.position = "top",legend.direction = "horizontal")
})
}
-运行应用程序
shinyApp(ui = ui,server = server)
-输出
