如何在Shiny中使用visNetworkProxy根据节点ID与节点进行交互

时间:2019-02-26 02:58:13

标签: javascript r shiny rstudio visnetwork

我正在Shiny应用程序中进行网络分析。

我想使用 visNetworkProxy 功能基于节点ID 交互(聚焦/选择)节点

但是,UI中的selectInput中的“ nodes $ id” 必须预定义。在这种情况下,我必须定义服务器外部的节点和边缘,而不是服务器内部。

由于我的项目性质,我必须保持服务器中定义的节点和边缘,以使其随数据库更新。

下面是我的代码:

  server <- function(input, output) {
  output$network_proxy_nodes <- renderVisNetwork({
    # minimal example
    nodes <- data.frame(id = 1:3)
    edges <- data.frame(from = c(1,2), to = c(1,3))

    visNetwork(nodes, edges) %>% visNodes(color = "blue")
  })


  observe({
    visNetworkProxy("network_proxy_nodes") %>%
      visFocus(id = input$Focus, scale = 4)
  })

  observe({
    visNetworkProxy("network_proxy_nodes") %>%
      visNodes(color = input$color)
  })

}

ui <- fluidPage(
  fluidRow(
    column(
      width = 4,
      selectInput("color", "Color :",
                  c("blue", "red", "green")),
      selectInput("Focus", "Focus on node :",
                  nodes$id)
    ),
    column(
      width = 8,
      visNetworkOutput("network_proxy_nodes", height = "400px")
    )
  )
)

shinyApp(ui = ui, server = server)

我想知道是否有一种方法可以与具有节点$ id的节点进行交互,同时保留服务器内部的节点和边缘

谢谢!

1 个答案:

答案 0 :(得分:1)

这将起作用。您需要根据节点动态呈现selectInput

library(shiny)

 server <- function(input, output) {

  # minimal example
  nodes <- data.frame(id = 1:3)
  edges <- data.frame(from = c(1,2), to = c(1,3))

  output$network_proxy_nodes <- renderVisNetwork({
    visNetwork(nodes, edges) %>% visNodes(color = "blue")
  })


  observeEvent(input$Focus, {
    visNetworkProxy("network_proxy_nodes") %>%
      visFocus(id = input$Focus, scale = 4)
  })

  observeEvent(input$color, {
    visNetworkProxy("network_proxy_nodes") %>%
      visNodes(color = input$color)
  })

  output$choose_node <- renderUI({
    selectInput("Focus", "Focus on node :",
                nodes$id)
  })

}

ui <- fluidPage(
  fluidRow(
    column(
      width = 4,
      selectInput("color", "Color :",
                  c("blue", "red", "green"))
    ),
    column(
      width = 8,
      visNetworkOutput("network_proxy_nodes", height = "400px"),
      uiOutput("choose_node")
    )
  )
)

shinyApp(ui = ui, server = server)

编辑

在评论之后,添加一个按钮。

library(shiny)

 server <- function(input, output) {

  # minimal example
  nodes <- data.frame(id = 1:3)
  edges <- data.frame(from = c(1,2), to = c(1,3))

  output$network_proxy_nodes <- renderVisNetwork({
    visNetwork(nodes, edges) %>% visNodes(color = "blue")
  })


  observeEvent(input$focus_now, {
    visNetworkProxy("network_proxy_nodes") %>%
      visFocus(id = input$Focus, scale = 4)
  })

  observeEvent(input$color, {
    visNetworkProxy("network_proxy_nodes") %>%
      visNodes(color = input$color)
  })

  output$choose_node <- renderUI({
    selectInput("Focus", "Focus on node :",
                nodes$id)
  })

}

ui <- fluidPage(
  fluidRow(
    column(
      width = 4,
      selectInput("color", "Color :",
                  c("blue", "red", "green"))
    ),
    column(
      width = 8,
      visNetworkOutput("network_proxy_nodes", height = "400px"),
      uiOutput("choose_node"),
      actionButton("focus_now", "FOCUS")
    )
  )
)

shinyApp(ui = ui, server = server)