sunburst plots: 'plotly_click' event_data only available for root and leafs #1648

library(plotly)
library(shinyjs)

DF <- structure(list(labels = c("total", "A", "C", "B", "F", "E", "F", 
                                "E", "D", "E", "D", "D", "F", "G", "H", "H", "G", "H", "G", "H", 
                                "H", "G", "I", "G", "I", "H", "G", "I", "I", "G", "G", "I", "H", 
                                "H", "I", "I", "I", "H", "I", "G"),
                     values = c(100L, 36L, 29L,
                                35L, 12L, 14L, 10L, 14L, 8L, 18L, 5L, 10L, 9L, 6L, 5L, 4L, 3L,
                                7L, 4L, 2L, 6L, 3L, 8L, 3L, 2L, 4L, 4L, 4L, 4L, 4L, 3L, 2L, 5L, 
                                5L, 2L, 2L, 1L, 1L, 1L, 5L),
                     parents = c(NA, "total", "total", "total", "total - A", "total - C", "total - C", "total - A",
                                 "total - B", "total - B", "total - C", "total - A", "total - B",
                                 "total - A - F", "total - C - E", "total - C - F", "total - A - E",
                                 "total - A - E", "total - B - D", "total - B - D", "total - B - E",
                                 "total - C - D", "total - B - E", "total - A - D", "total - B - D",
                                 "total - B - F", "total - C - F", "total - A - E", "total - C - E",
                                 "total - B - E", "total - B - F", "total - A - D", "total - A - D",
                                 "total - A - F", "total - B - F", "total - C - F", "total - C - D",
                                 "total - C - D", "total - A - F", "total - C - E"),
                     ids = c(
                       "total", "total - A", "total - C", "total - B", "total - A - F", "total - C - E", 
                       "total - C - F", "total - A - E", "total - B - D", "total - B - E", "total - C - D",
                       "total - A - D", "total - B - F", "total - A - F - G", "total - C - E - H",
                       "total - C - F - H", "total - A - E - G", "total - A - E - H", "total - B - D - G",
                       "total - B - D - H", "total - B - E - H", "total - C - D - G", "total - B - E - I",
                       "total - A - D - G", "total - B - D - I", "total - B - F - H", "total - C - F - G",
                       "total - A - E - I", "total - C - E - I", "total - B - E - G", "total - B - F - G",
                       "total - A - D - I", "total - A - D - H", "total - A - F - H", "total - B - F - I",
                       "total - C - F - I", "total - C - D - I", "total - C - D - H", "total - A - F - I",
                       "total - C - E - G"
                     )), row.names = c(NA,-40L), class = "data.frame")

ui <- fluidPage(
  useShinyjs(),
  plotlyOutput("sunburst"),
  htmlOutput("hoverDataOut"),
  htmlOutput("clickDataOut")
)

server <- function(input, output, session) {
  output$sunburst <- renderPlotly({
    plot_ly(data = DF, source = "sunSource", customdata = ~ids, ids = ~ids, labels= ~labels, parents = ~parents, values= ~values, type='sunburst', branchvalues = 'total')
  })
  
  hoverData <- reactive({
    currentEventData <- unlist(event_data(event = "plotly_hover", source = "sunSource", priority = "event"))
  })
  
  clickData <- reactiveVal()
  
  observe({
    clickData(unlist(event_data(event = "plotly_click", source = "sunSource", priority = "event")))
  })
  
  # workaround:
  # onclick(id = "sunburst", expr = {clickData(hoverData())})
  
  output$hoverDataOut <- renderText({
    paste("Hover data:", paste(names(hoverData()), unlist(hoverData()), sep = ": ", collapse = " | "))
  })
  
  output$clickDataOut <- renderText({
    paste("Click data:", paste(names(clickData()), unlist(clickData()), sep = ": ", collapse = " | "))
  })
  
}

shinyApp(ui, server)