作为R有光泽plotly的图的图例点击姓名时事件

Question

我想显示一些信息，当用户点击一个plotly图的图例。例如在下面的代码，如果在“DRAT”名用户点击的传奇unshow这些数据，我想打印一个短信说“DRAT和QseC的选择”。

我看到这个计算器的帖子：R shiny and plotly getting legend click events但它与标签的作品。就我而言，标签是不是可用的参数。我已经测试了不同的plotly事件，但没有返回，当我点击传说的任何信息（见下面的代码）。

有没有一种方法能有这个信息？

谢谢

library(plotly)
library(shiny)

ui <- fluidPage(
  plotlyOutput("plot"),
  verbatimTextOutput("hover"),
  verbatimTextOutput("click"),
  verbatimTextOutput("brush"),
  verbatimTextOutput("zoom")

)

server <- function(input, output, session) {

  output$plot <- renderPlotly({
    p <- plot_ly()
    for(name in c("drat", "wt", "qsec"))
    {
      p = add_markers(p, x = as.numeric(mtcars$cyl), y = as.numeric(mtcars[[name]]), name = name)
    }

    p
  })

  output$hover <- renderPrint({
    d <- event_data("plotly_hover")
    if (is.null(d)) "Hover events appear here (unhover to clear)" else d
  })

  output$click <- renderPrint({
    d <- event_data("plotly_click")
    if (is.null(d)) "Click events appear here (double-click to clear)" else d
  })

  output$brush <- renderPrint({
    d <- event_data("plotly_selected")
    if (is.null(d)) "Click and drag events (i.e., select/lasso) appear here (double-click to clear)" else d
  })

  output$zoom <- renderPrint({
    d <- event_data("plotly_relayout")
    if (is.null(d)) "Relayout (i.e., zoom) events appear here" else d
  })

}

shinyApp(ui, server)

Answer 1

library(plotly)
library(shiny)
library(htmlwidgets)

js <- c(
  "function(el, x){",
  "  el.on('plotly_legendclick', function(evtData) {",
  "    Shiny.setInputValue('trace', evtData.data[evtData.curveNumber].name);",
  "  });",
  "}")


ui <- fluidPage(
  plotlyOutput("plot"),
  verbatimTextOutput("legendItem")
)

server <- function(input, output, session) {

  output$plot <- renderPlotly({
    p <- plot_ly()
    for(name in c("drat", "wt", "qsec"))
    {
      p = add_markers(p, x = as.numeric(mtcars$cyl), y = as.numeric(mtcars[[name]]), name = name)
    }
    p %>% onRender(js)
  })

  output$legendItem <- renderPrint({
    d <- input$trace
    if (is.null(d)) "Clicked item appear here" else d
  })
}

shinyApp(ui, server)