r - 更改 networkD3 图的背景颜色

Question

假设我制作了一个 networkD3 图 - 使用包中的最小示例

#
library(networkD3)

# Load data
data(MisLinks)
data(MisNodes)

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

如果我在浏览器中打开它，我可以使用开发人员工具将 body 的背景颜色更改为例如 background-color: #DAE3F9;"
有没有办法自动将绘图的背景颜色(从默认白色)定义为另一种颜色，而无需在浏览器中打开？基本上，我们可以像添加 JS 函数一样直接在代码中添加 CSS 吗？

Answer 1

如果可能，我们可以使用 htmltools 的帮助。以几种方式。

library(networkD3)

# Load data
data(MisLinks)
data(MisNodes)

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

library(htmltools)

# don't like using the !important modifier
#  but without script not sure there is another way
#  to override the default white background
browsable(
  tagList(
    tags$head(
      tags$style('body{background-color: #DAE3F9 !important}')
    ),
    forceNetwork(Links = MisLinks, Nodes = MisNodes,
                 Source = "source", Target = "target",
                 Value = "value", NodeID = "name",
                 Group = "group", opacity = 0.8)
  )
)

# if you want to limit the background-color to
#  the htmlwidget, we could wrap in tags$div
browsable(
  tags$div(
    style = "background-color:#DAE3F9;",
    forceNetwork(Links = MisLinks, Nodes = MisNodes,
                 Source = "source", Target = "target",
                 Value = "value", NodeID = "name",
                 Group = "group", opacity = 0.8)
  )
)

# if you are ok with script then we
#  we could do something like this
browsable(
  tagList(
    forceNetwork(Links = MisLinks, Nodes = MisNodes,
                 Source = "source", Target = "target",
                 Value = "value", NodeID = "name",
                 Group = "group", opacity = 0.8),
    tags$script(
'
document.body.style.backgroundColor = "#DAE3F9"
'      
    )
  )
)