ToolTip when you mouseover a ggplot on shiny

Question

I am building a shiny application.

I am plotting charts using ggplot.

When I mouseover the points on the graph, I want a tooltip showing one of the columns i

Answer 1

Using plotly, you can just translate your ggplot into an interactive version of itself. Just call the function ggplotly on your ggplot object:

library(plotly)

data(mtcars)

shinyApp(
ui <- shinyUI(fluidPage(
  sidebarLayout(sidebarPanel( h4("Test Plot")),
    mainPanel(plotlyOutput("plot1"))
  )
)),

server <- shinyServer(
  function(input, output) {
    output$plot1 <- renderPlotly({
      p <- ggplot(data=mtcars,aes(x=mpg,y=disp,color=factor(cyl)))
      p <- p + geom_point()

      ggplotly(p)
    })
  }
))

shinyApp(ui, server)

For customizations of what is shown in the tooltip, look e.g. here.