shiny - ggvis, tooltip for bar plots -


i trying create tooltip bar plot. tried same code on layer_points, , works fine. however, when switch layer_bars, function not work anymore. tooltip not show case. can please help? here code:

the data using contains x: index, , ss.plus: positive numbers

ui.r:

library(ggvis) shinyui(fluidpage("test",    fluidrow(      plotoutput("realdata", height = "200")    ),    sidebarlayout(      sidebarpanel(       sliderinput("range.real", label="select range of view", min=1, max=1808, value=c(1, 50) )     ),     mainpanel(       ggvisoutput("barplus")     )                ) ))

server.r:

library(ggvis) shinyserver(function(input, output, session){  sub.data <- reactive({   real.data[input$range.real[1]:input$range.real[2],] })   on_hover <- function(x){   if(is.null(x)) return(null)   paste0(x$x, ",", x$ss.plus) }   sub.data %>%   ggvis(~x, ~ss.plus) %>%   layer_bars(width=0.8) %>%   add_tooltip(on_hover, "hover") %>%   bind_shiny("barplus") })


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