tooltip on shiny R?

Question

I want to have a tool-tip in my Shiny R application. Is there any easy way to achieve that? For now, I am creating a density map and I want a simple tool-tip showing "click here to slide through years" while hovering the mouse over slider YEAR.

User Interface:

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%")   ) )) 

Server Code:

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)     }) }) 

Thanks for the help.

Answer 1

I think you should be able to replace this:

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

with this:

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