r - 单击 Shiny 应用程序中的网络节点后更新数据表

Question

我有一个简单的 Shiny 应用程序，它显示一个网络，在下表中您可以看到通过边和边的名称连接节点之间的所有连接。我想更新数据表以在单击节点时仅显示选定的节点信息。例如，当我单击节点“articaine”时，表中只会显示“articaine”连接。

#dataset
id<-c("articaine","benzocaine","etho","esli")
  label<-c("articaine","benzocaine","etho","esli")
  node<-data.frame(id,label)

  from<-c("articaine","articaine","articaine","articaine","articaine","articaine","articaine","articaine","articaine")
  to<-c("benzocaine","etho","esli","benzocaine","etho","esli","benzocaine","etho","esli")
  title<-c("SCN1A","SCN1A","SCN1A","SCN2A","SCN2A","SCN2A","SCN3A","SCN3A","SCN3A")

  edge<-data.frame(from,to,title)

#app

#ui.r
library(igraph)
library(visNetwork)
library(dplyr)
library(shiny)
library(shinythemes)
library(DT)

ui <- fluidPage(theme = shinytheme("cerulean"),  # Specify that the Cerulean Shiny theme/template should be used

                # Generate Title Panel at the top of the app
                titlePanel("Network Visualization App"),  

                # Render as a sidebarLayout. Shiny expects that a sidebarPanel() function and a mainPanel() function are present.

                sidebarLayout(

                  # Sidebar section. Can set the width of the sidebar for any value ranging from 1 to 12.

                  sidebarPanel(             
                  ), # End of the sidebar panel code

                  # Define the main panel
                  mainPanel(

                    h3("Network Visualization"),

                    # Plot the network diagram within the main panel. 
                    # Note that visNetworkOutput is not a Shiny package function, but a visNetwork package function.
                    visNetworkOutput("plot2"),
                    fluidRow(
                      DTOutput('tbl')
                    )

                    ) # End of main panel code

                )
)
#server.r
library(igraph)
library(visNetwork)
library(dplyr)
library(shiny)
library(shinythemes)

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


  # Use the renderVisNetwork() function to render the network data.

  output$plot2 <- renderVisNetwork({
    visNetwork(nodes = node,edge)%>% 


      visOptions(highlightNearest=T, nodesIdSelection = T) %>%

      # Specify that hover interaction and on-screen button navigations are active
      visInteraction(hover = T, navigationButtons = T) %>%

      visIgraphLayout()

  })
  output$tbl = renderDT(
    edge, options = list(lengthChange = FALSE)
  )
}

Answer 1

这是一个替代解决方案，允许选择多个节点，并且不使用observe，但在其他方面与firmo23 发布的解决方案类似。我过滤到“到”或“从”列中选定节点的任何边，因为我不清楚您要的是哪个。

另外，关于布局的一些评论:侧边栏和主面板布局不是必需的。我倾向于使用 fluidRow() 和 column() 的嵌套来显式定义面板，我在下面完成了这一点。

library(igraph)
library(visNetwork)
library(dplyr)
library(shiny)
library(shinythemes)
library(DT)

#dataset
id<-c("articaine","benzocaine","etho","esli")
label<-c("articaine","benzocaine","etho","esli")
node<-data.frame(id,label)

from<-c("articaine","articaine","articaine",
        "articaine","articaine","articaine",
        "articaine","articaine","articaine")
to<-c("benzocaine","etho","esli","benzocaine","etho","esli","benzocaine","etho","esli")
title<-c("SCN1A","SCN1A","SCN1A","SCN2A","SCN2A","SCN2A","SCN3A","SCN3A","SCN3A")

edge<-data.frame(from,to,title)


#app

ui <- fluidPage(

  # Generate Title Panel at the top of the app
  titlePanel("Network Visualization App"),

  fluidRow(
    column(width = 6,
           DTOutput('tbl')),
    column(width = 6,
           visNetworkOutput("network")) #note that column widths in a fluidRow should sum to 12
  ),
  fluidRow(column(width = 6), 
           column(width=6, "Click and hold nodes for a second to select additional nodes.")
  )

) #end of fluidPage


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

  output$network <- renderVisNetwork({
    visNetwork(nodes = node,edge) %>% 
      visOptions(highlightNearest=TRUE, 
                 nodesIdSelection = TRUE) %>%
      #allow for long click to select additional nodes
      visInteraction(multiselect = TRUE) %>%
      visIgraphLayout() %>% 

      #Use visEvents to turn set input$current_node_selection to list of selected nodes
      visEvents(select = "function(nodes) {
                Shiny.onInputChange('current_node_selection', nodes.nodes);
                ;}")

  })

  #render data table restricted to selected nodes
  output$tbl <- renderDT(
    edge %>% 
      filter((to %in% input$current_node_selection)|(from %in% input$current_node_selection)),
    options = list(lengthChange = FALSE)
  )

}

shinyApp(ui, server)

^{由reprex package于2018年9月24日创建(v0.2.1)}