Printing a sankey diagram in Shiny - r

Question

I created a sankey diagram like this:
#install.packages("networkD3")
library(networkD3)
nodes = data.frame("name" =
c("Retour", # Node 0
"niet tevreden/ontevreden", # Node 1
"fout", # Node 2
"stuk",
"adres",
"verpakking",
"gebroken/glas"))# Node 3
links = as.data.frame(matrix(c(
0, 1, 10, # Each row represents a link. The first number
0, 2, 20, # represents the node being conntected from.
0, 3, 30,
2, 4, 8,
3, 5, 10,
3, 6, 12# the second number represents the node connected to.
),# The third number is the value of the node
byrow = TRUE, ncol = 3))
names(links) = c("source", "target", "value")
sankeyNetwork(Links = links, Nodes = nodes,
Source = "source", Target = "target",
Value = "value", NodeID = "name",
fontSize= 12, nodeWidth = 30)
Working fine, however now I would like to use this plot into shiny. Therefore the did the following:
## app.R ##
library(shinydashboard)
ui <- dashboardPage(
dashboardHeader(title = "Basic dashboard"),
dashboardSidebar(),
dashboardBody(
# Boxes need to be put in a row (or column)
fluidRow(
box(plotOutput("plot1", height = 250))
)
)
)
library(networkD3)
server <- function(input, output) {
histdata <- rnorm(500)
nodes = data.frame("name" =
c("Retour", # Node 0
"niet tevreden/ontevreden", # Node 1
"fout", # Node 2
"stuk",
"adres",
"verpakking",
"gebroken/glas"))# Node 3
links = as.data.frame(matrix(c(
0, 1, 10, # Each row represents a link. The first number
0, 2, 20, # represents the node being conntected from.
0, 3, 30,
2, 4, 8,
3, 5, 10,
3, 6, 12# the second number represents the node connected to.
),# The third number is the value of the node
byrow = TRUE, ncol = 3))
names(links) = c("source", "target", "value")
output$plot1 <- renderPlot({
sankeyNetwork(Links = links, Nodes = nodes,
Source = "source", Target = "target",
Value = "value", NodeID = "name",
fontSize= 12, nodeWidth = 30)
})
output$plot2 <- renderPlot({
data <- histdata[seq_len(10)]
hist(data)
})
}
shinyApp(ui, server)
Thing is that Shiny for some reason can read the sankey diagram. If I change the code:
box(plotOutput("plot1", height = 250))
To:
box(plotOutput("plot2", height = 250))
It is plotting the histogram. So there seems to be something wrong with the sankey diagram. Any thoughts on what is causing this?

Answer 1

You should use the renderSankeyNetwork and sankeyNetworkOutput functions in networkD3 instead of plotOutput and renderPlot. So with your data already loaded, it would look like...
library(shiny)
library(shinydashboard)
library(networkD3)
ui <- dashboardPage(
dashboardHeader(title = "Basic dashboard"),
dashboardSidebar(),
dashboardBody(
# Boxes need to be put in a row (or column)
fluidRow(
sankeyNetworkOutput("plot")
)
)
)
server <- function(input, output) {
output$plot <- renderSankeyNetwork({
sankeyNetwork(Links = links, Nodes = nodes,
Source = "source", Target = "target",
Value = "value", NodeID = "name",
fontSize= 12, nodeWidth = 30)
})
}
shinyApp(ui, server)
Also see the example here