响应节点单击的Shiny & networkD3

Question

我正在尝试使用networkD3和shiny来可视化一些数据。我想有一个动作发生时，在一个图形中的节点被单击。我使用的是diagonalNetwork函数，如以下代码所示。

forceNetwork函数有一个选项，可以让clickaction在节点被单击时响应。但是，对于diagonalNetwork函数，我找不到类似的选项。有没有其他方法来实现这一点？

#### Load necessary packages and data ####
library(shiny)
library(networkD3)

data(MisLinks)
data(MisNodes)

hc <- hclust(dist(USArrests), "ave")
URL <- paste0(
  "https://cdn.rawgit.com/christophergandrud/networkD3/",
  "master/JSONdata//flare.json")



## Convert to list format
Flare <- jsonlite::fromJSON(URL, simplifyDataFrame = FALSE)


#### Server ####
server <- function(input, output) {

  output$simple <- renderDiagonalNetwork({
    diagonalNetwork(List = Flare, fontSize = 10, opacity = 0.9)
  })  


  output$force <- renderForceNetwork({
    forceNetwork(Links = MisLinks, Nodes = MisNodes, Source = "source",
                 Target = "target", Value = "value", NodeID = "name",
                 Group = "group", opacity = input$opacity)


  })

  ## 
  #dendroNetwork(hc, height = 600)
 # 
#  dendroNetwork(hc, height = 500, width = 800, fontSize = 10,
#                linkColour = "#ccc", nodeColour = "#fff", nodeStroke = "steelblue",
#                textColour = "#111", textOpacity = 0.9, textRotate = NULL,
#                opacity = 0.9, margins = NULL, linkType = c("elbow", "diagonal"),
#                treeOrientation = c("horizontal", "vertical"), zoom = FALSE)



}

#### UI ####

ui <- shinyUI(fluidPage(

  titlePanel("Shiny networkD3 "),

  sidebarLayout(
    sidebarPanel(
      sliderInput("opacity", "Opacity (not for Sankey)", 0.6, min = 0.1,
                    max = 1, step = .1)
    ),
    mainPanel(
      tabsetPanel(
        tabPanel("Simple Network", diagonalNetworkOutput("simple")),
        tabPanel("Force Network", forceNetworkOutput("force"))
      )
    )
  )
))

#### Run ####
shinyApp(ui = ui, server = server)

Answer 1

您可以使用htmlwidgets的onRender函数将onclick事件附加到节点，如下所示……

library(shiny)
library(networkD3)
library(htmlwidgets)

URL <- "https://raw.githubusercontent.com/christophergandrud/networkD3/master/JSONdata/flare.json"
Flare <- jsonlite::fromJSON(URL, simplifyDataFrame = FALSE)

clickJS <- 'd3.selectAll(".node").on("click", function(d){ alert(d.data.name); })'
  
server <- function(input, output) {
  output$simple <- renderDiagonalNetwork({
    onRender(diagonalNetwork(List = Flare, fontSize = 10, opacity = 0.9), clickJS)
  })
}

ui <- fluidPage(
    diagonalNetworkOutput("simple"),
    tags$script(clickJS)
)

shinyApp(ui = ui, server = server)