r - 在 Sankey 工具提示中显示边缘信息

Question

我在 networkD3 包中使用 sankeyNetwork 来创建可视化

我想为每条边分配一个名称/ID，以便出现在工具提示中。这可以通过 sankeyNetwork 或 networkD3 包中的任何其他功能来完成吗？

Answer 1

这在技术上不受支持，但您可以像这样实现它......

library(networkD3)
library(htmlwidgets)

links <- data.frame(
  src = c(0, 0, 1, 2),
  target = c(2, 3, 2, 4),
  value = 1,
  name = c("first", "second", "third", "fourth")
)

nodes <- data.frame(name = c("one", "two", "three", "four", "five"))

# save the result of sankeyNetwork in an object
sn <- networkD3::sankeyNetwork(
  Links = links,
  Nodes = nodes,
  Source = 'src',
  Target = 'target',
  Value = 'value',
  NodeID = 'name'
)

# add the names back into the links data because sankeyNetwork strips it out
sn$x$links$name <- links$name

# add onRender JavaScript to set the title to the value of 'name' for each link
sn <- htmlwidgets::onRender(
  sn,
  '
  function(el, x) {
  d3.selectAll(".link").select("title foreignObject body pre")
  .text(function(d) { return d.name; });
  }
  '
)

# display the result
sn