How can I grab the row of data from a ggplotly in shiny

问题

Code Below.

I'm trying to use the plotly_click event to figure out what data is being selected. However, I can't figure out how to do it. The data provided by plotly_click is very minimal and doesn't include the grouping or groups at all. I don't have any JS experience, but I know there must be a way! My goal is to be able to select a data point and be able to grab the row it corresponds to in a data.frame d1

d1=structure(list(Topic = c("compensation", "manager", "benefits",
                         "family", "communication", "worklifebalance", "perks", "compensation",
                         "benefits", "manager", "communication", "worklifebalance", "family",
                         "perks", "benefits", "compensation", "manager", "communication",
                         "family", "worklifebalance", "perks"),
                  variable = structure(c(1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L),
                                       .Label = c("Prct", "Count"), class = "factor"),
                  value = c(2.23121245555964, 0.723305136692411, 0.576192227534633,
                         0.202280250091946, 0.190020840995464, 0.153242613706019,
                         0.0122594090964816, 0.913705583756345, 0.609137055837563,
                         0.50761421319797, 0.50761421319797, 0.304568527918782, 0.203045685279188,
                         0, 1.49977276170277, 1.21193758521436, 0.893803969095592,
                         0.439327374640206, 0.348432055749129, 0.242387517042872,
                         0.0757460990758976),
                  group = c("APAC", "APAC", "APAC", "APAC",  "APAC", "APAC", "APAC",
                            "EMEA", "EMEA", "EMEA", "EMEA", "EMEA", "EMEA", "EMEA",
                            "AMERICAS", "AMERICAS", "AMERICAS", "AMERICAS", "AMERICAS",
                            "AMERICAS", "AMERICAS")),
             .Names = c("Topic", "variable", "value", "group"), class = c("data.table", "data.frame"),
             row.names = c(NA, -21L))


library(needs)
needs(
  stringr,
  data.table,
  tm,
  ggplot2,
  wordcloud,
  readxl,
  dplyr,
  quanteda,
  topicmodels,
  reshape,
  plotly,
  shiny,
  rCharts,
  ggthemes,
  shinyjs,
  shinyWidgets,DT,shinythemes,
  ggrepel,tidyverse,treemapify
)
options(stringsAsFactors = F)

library(shiny)
ui <- fluidPage(
  fluidRow(plotlyOutput('keywords')),
  fluidRow(  verbatimTextOutput("selection")) )



server = function(input,output){
  output$keywords = renderPlotly({


    d0 = d1
    p = ggplot(d0, aes(reorder(Topic,-value), value)) +
      geom_point(aes(colour = value),
        shape = 16,
        size = 3,
        show.legend = F) +
      facet_wrap(~ group)+
      theme_minimal()
    ggplotly(p)


  })
  output$selection <- renderPrint({
    s <- event_data("plotly_click")
      cat("You selected: \n\n")
      as.list(s)

  })
}


shinyApp(ui, server)

回答1:

I am not sure if this is what you want, but you could try:

library(shiny)
library(plotly)
library(DT)

ui <- fluidPage(
   fluidRow(plotlyOutput('keywords')),
   fluidRow(verbatimTextOutput("selection")),
   fluidRow(DT::dataTableOutput("table1"))
)   

server = function(input,output){
output$keywords = renderPlotly({

d0 = d1
key <- row.names(d0)
d0 <- data.frame(d3, key)  

p = ggplot(d0, aes(reorder(Topic,-value), value, key = key)) +
        geom_point(aes(colour = value),
                   shape = 16,
                   size = 3,
                   show.legend = F) +
        facet_wrap(~ group)+
        theme_minimal()
      ggplotly(p)


    })
    output$selection <- renderPrint({
      s <- event_data("plotly_click")
      cat("You selected: \n\n")
      data.frame(s)
    })

    selection2 <- reactive({
      s <- event_data("plotly_click")
      cat("You selected: \n\n")
      df <- data.frame(s)
    })

    output$table1 = renderDT({
      d2 <- d1 %>% filter(key == selection2()$key)
      d2 
  }) 
  }

shinyApp(ui, server)

回答2:

I have only used plotly_selected but I assume plotly_clicked should be similar. plotly_selected will be triggered when you brush over the plot.

Here is an example:

# 'data' is the data frame you used to draw the plot
brushed_data <- reactive({
  d <- event_data("plotly_selected")

  data_key <- d$key

  if (!is.null(data_key) && length(data_key) > 0) {
   # if it's not the row names, can be any column 'data[data$key %in% data_key,]
   data[rownames(data) %in% data_key,]
  } else {
    data.frame()
  }
})

The key is specified when you draw your plot, in my case, I pass key = rownames(data) to add_markers

EDIT Adapted the Plotly website example using ggplot2 and plotly_click

library(plotly)
library(shiny)

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

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

  output$plot <- renderPlotly({
    # use the key aesthetic/argument to help uniquely identify selected observations
    key <- row.names(mtcars)
    p <- ggplot(mtcars, aes(x = mpg, y = wt, colour = factor(vs), key = key)) + 
      geom_point() + facet_wrap(~ cyl)
    ggplotly(p) %>% layout(dragmode = "select")
  })

  output$click <- renderPrint({
    d <- event_data("plotly_click")
    req(d)
    print(mtcars[d$key, ])
  })

  output$brush <- renderPrint({
    d <- event_data("plotly_selected")
    req(d)
    print(mtcars[d$key, ])
  })

}

shinyApp(ui, server)

来源：https://stackoverflow.com/questions/48939382/how-can-i-grab-the-row-of-data-from-a-ggplotly-in-shiny