我正在尝试使用Shiny创建小应用程序。下面是我要创建的数据框架。
data<-data.frame(state=c('AZ','VA','CA','AZ','VA','CA'), city=c('Phoenix','Arlington','SantaClara','Mesa','Richmond','SF'),
avg=c(10,15,16,13,14,14), date=c('01/09/2017','01/10/2017','01/11/2017','02/09/2017','02/10/2017','02/10/2017'),stringsAsFactors = FALSE)
所以,我试图在日期(x轴)和平均值(y轴)之间创建一个图形。因此,此图表应根据State的下拉列表中的选择进行更改。例如,对于特定的选定状态,它应显示该州的可用城市(在其他下拉列表中)。
以下是我的代码:
library(shiny)
library(ggplot2)
library(plotly)
statelist<-as.list(data$state)
citylist<-as.list(data$city)
ui <- basicPage(
# plotOutput("plot1", click = "plot_click"),
# verbatimTextOutput("info")
sidebarPanel(
selectInput("plot1", label=h3("Select State"), choices = statelist),
selectInput("plot2", label=h3("Select City"), choices = citylist)
),
plotOutput(outputId="plot")
),
server <- function(input, output, session) {
observe(
{
state <- input$plot1
updateSelectInput(session, "plot2", choices = data$city[data$state == state])
}
),
output$plot<-renderPlot({
ggplot(data[data$city == input$plot2 &
data$state == input$plot1],aes(date,avg))
+geom_line()
})
}
shinyApp(ui, server)
Dropdown工作正常但没有得到图表。
提前致谢!!
答案 0 :(得分:1)
我对您的代码进行了一些小修改:
data[data$city == input$plot2 &
data$state == input$plot1,]
希望这有帮助!
library(shiny)
library(ggplot2)
library(plotly)
data<-data.frame(state=c('AZ','VA','CA','AZ','VA','CA'), city=c('Phoenix','Arlington','SantaClara','Mesa','Richmond','SF'),
avg=c(10,15,16,13,14,14), Date=c('01/09/2017','01/10/2017','01/11/2017','02/09/2017','02/10/2017','02/10/2017'),stringsAsFactors = FALSE)
statelist<-unique(data$state)
citylist<-unique(data$city)
ui <- basicPage(
# plotOutput("plot1", click = "plot_click"),
# verbatimTextOutput("info")
sidebarPanel(
selectInput("plot1", label=h3("Select State"), choices = statelist),
selectInput("plot2", label=h3("Select City"), choices = citylist)
),
plotOutput(outputId="plot")
)
server <- function(input, output, session) {
observeEvent(input$plot1,
{
state <- input$plot1
updateSelectInput(session, "plot2", choices = data$city[data$state == state])
}
)
output$plot<-renderPlot({
data = data[data$city == input$plot2 &
data$state == input$plot1,]
ggplot(data,aes(Date,avg)) + geom_point(size=5) + ggtitle(paste0(input$plot1," - ",input$plot2 ))
})
}
shinyApp(ui, server)