使用networkD3 = NULL将networkD3中的节点链接到网站

Question

是否有一种方法可以使用一个节点作为链接到一个外部网站，使用函数forceNetwork()在networkD3包中r？我在想也许修改一下clickAction

示例数据：

library(networkD3)
data(MisLinks)
data(MisNodes)

# Create a random URL in the nodes dataset
MisNodes$URL <- paste0("http://www.RANDOMLINK_", sample(1:100, NROW(MisNodes)), ".com")
head(MisNodes)

MyClickScript <- 'alert(d.index)'

forceNetwork(Links = MisLinks, Nodes = MisNodes,
             Source = "source", Target = "target",
             Value = "value", NodeID = "name",
             Group = "group", opacity = 0.8,
             clickAction = MyClickScript)

期望结果:当用户单击节点时，将打开一个新选项卡(例如window.open)，指向该节点的相关URL --如何让clickAction指向MisNodes$URL[d.index]

Answer 1

networkD3的设计并不能使这件事变得容易。这里有一个回答的方法。我将尝试用内联的方式来解释我们在每一步中都在做什么。

library(networkD3)

# example from ?forceNetwork
data(MisLinks)
data(MisNodes)
# Create graph
fn <- forceNetwork(
  Links = MisLinks, Nodes = MisNodes, Source = "source",
  Target = "target", Value = "value", NodeID = "name",
  Group = "group", opacity = 0.4, zoom = TRUE
)

# let's look at our forceNetwork
#   nodes are provided to JavaScript
#   in a nodes data.frame
str(fn$x$nodes)

# make up some links to demonstrate
#   how we can add them to our nodes df
fn$x$nodes$hyperlink <- paste0(
  'http://en.wikipedia.org/wiki/Special:Search?search=',
  MisNodes$name
)

# then with our hyperlinks in our data
#   we can define a click action to open
#   the hyperlink for each node in a new window
fn$x$options$clickAction = 'window.open(d.hyperlink)'

fn