Is there a way to add legend next to a dygraph in R, not exactly on the plot?

Question

I\'vw plotted a dygraph using a dygraph function from a dygraphs R package. I wonder is there a way to put legend next to the plot, not exactly on it like it is

Answer 1

Yes, read ?dygraphs::dyLegend. The description of labelsDiv argument says:

Show data labels in an external div, rather than on the graph. This value should be a div element id.

This is easy to do in a shiny context of course, but not in rstudio.

For instance, in Shiny ui.R file, I have added this line:

box(title = "Legend", textOutput("legendDivID"))

Which creates an HTML <div> tag with the ID legendDivID. Then, in Shiny server.R file, I use the same ID in dygraphs params:

dygraph(...) %>% dyLegend(labelsDiv = "legendDivID")

And it works like a charm.

In your case, here is the result:

And the code (just create app.R script in RStudio and run it by calling shiny::runApp()):

## app.R ##
library(shinydashboard)
library(shiny)
library(dygraphs)

ui <- dashboardPage(
  dashboardHeader(title = "Page title"),
  dashboardSidebar(sidebarMenu(menuItem("tab title", tabName = "tab", icon = icon("globe")))),
  dashboardBody(
    tabItems(
      tabItem(tabName = "tab",
              fluidRow(
                  box(dygraphOutput("graph"), width=9),
                  box(textOutput("legendDivID"), title = "Legend", collapsible = TRUE, width=3)
                )
      )
    )
  )
)

server <- function(input, output) {
  library(archivist)
  library(dplyr)
  seriesReactive <- loadFromGithubRepo( "db914a43536d4d3f00cf3df8bf236b4a", user= "MarcinKosinski", repo="Museum", value = TRUE)

  output$graph <- renderDygraph({
    withProgress(message = "Loading...", {
      dygraph(seriesReactive, main = "Dzienna proporcja kliknięć do odsłon dla danych struktur", ylab = "Proporcja") %>% 
        dyRangeSelector() %>%
        dyLegend(labelsDiv = "legendDivID")
    })
  })
}

shinyApp(ui, server)