Question

我正在尝试在一个简单的Shiny App中自动查询用户参数。

类似于https://github.com/daattali/advanced-shiny/tree/master/navigate-history和“书签”选项，我想要一个代码：

允许我转到http://localhost:8080/?bins=10并查看设置为10的滑块。
保持历史并在每次移动垃圾箱滑块时更改URL

这是功能1的MWE，但我无法激活功能2：

library(shiny)

# Define UI for application that draws a histogram
ui <- fluidPage(

  # Application title
  titlePanel("Old Faithful Geyser Data"),

  # Sidebar with a slider input for number of bins 
  sidebarLayout(
    sidebarPanel(
      sliderInput("bins",
                  "Number of bins:",
                  min = 1,
                  max = 50,
                  value = 30)
    ),

    # Show a plot of the generated distribution
    mainPanel(
      plotOutput("distPlot")
    )
  )
)

# Define server logic required to draw a histogram
server <- function(input, output, session) {
  observe({
    query <- parseQueryString(session$clientData$url_search)
    if (!is.null(query[['bins']])) {
      updateNumericInput(session, "bins", value = query[['bins']])
    }
  })

  output$distPlot <- renderPlot({
    # generate bins based on input$bins from ui.R
    x    <- faithful[, 2] 
    bins <- seq(min(x), max(x), length.out = input$bins + 1)

    # draw the histogram with the specified number of bins
    hist(x, breaks = bins, col = 'darkgray', border = 'white')
  })
}

# Run the application 
shinyApp(ui = ui, server = server)

自动查询并在Shiny中保留历史记录

0 个答案: