r - 闪亮的 R 上的工具提示？

Question

我想在我的Shiny R应用程序中有一个工具提示。有什么简单的方法可以实现吗？现在，我正在创建一个密度图，并且我想要一个简单的工具提示显示“单击此处以滑过年份”，同时将鼠标悬停在滑块 YEAR 上。

用户界面：

library(shiny)
shinyUI(pageWithSidebar(
  headerPanel("Density Map"),
  sidebarPanel(
    sliderInput("slider_year", "YEAR:", 
                min = 2001, max = 2011, value = 2009, 
                format="####", locale="us"
    )
  )
 ),

  mainPanel(  
    plotOutput("event_heatmap_map", width = "100%", height = "100%")
  )
))

服务器代码：

library(shiny)
library(ggmap)
library(ggplot2)
mydata <- read.csv("/var/shiny-server/www/dMetrics.csv")
shinyServer(function(input, output) {
    output$event_heatmap_map <- renderPlot(width = "auto", height = 640,{

        slice_year <- mydata[mydata$YEAR==input$slider_year,]
        map <- get_map(c(lon = -55.3632715, lat = 31.7632836), zoom = 3, source = 'google', maptype = c("terrain"), messaging = FALSE, color = 'color')
        world <- ggmap(map)
        world <- world + stat_density2d(data = slice_year, aes(x = WEST, y = NORTH, fill = ..level.., alpha = ..level..), show_guide = FALSE, geom = "polygon", na.rm = TRUE) + scale_fill_gradient(name="Density", low="maroon", high="yellow", guide = 'colorbar')
        plot(world)
    })
})

谢谢您的帮助。

Answer 1

我认为你应该能够替换这个：

sliderInput("slider_year", "YEAR:", 
            min = 2001, max = 2011, value = 2009, 
            format="####", locale="us"
)

有了这个：

tags$div(title="Click here to slide through years",
    sliderInput("slider_year", "YEAR:", 
                min = 2001, max = 2011, value = 2009, 
                format="####", locale="us"
    )
)

Answer 2

这是稍微更容易和更优雅的方式。

library(shinyBS) # Additional Bootstrap Controls

## From ui.R: Adds a tooltip to element with inputId = "someInput" 
## with text, "This is an input.", that appears to the left on hover.
bsTooltip(id = "someInput", title = "This is an input", 
          placement = "left", trigger = "hover")

## From server.R: Add the same tooltip as above
addTooltip(session, id = "someInput", title = "This is an input.",
           placement = "left", trigger = "hover")

ui.R您可以在或中添加 Tooltip server.R，另外您还可以使用 Popover。