CODEWITHSUNDEEP
htmlrshiny
edv
edv

Reputation: 177

How to render a special character using HTML in Shiny R?

I am trying to display a greek letter delta as a symbol. The unicode and encoding can be found here.

output$text <- renderText({
      HTML("Displaying greek letter delta as a symbol: \u0394")
    })

This results in exactly the same string when rendered instead of a symbol. Same happens when using "&#916;" or "&#x394;". Maybe someone knows how to correctly format text with special symbols when using HTML() in R, or share any documentation relating this?

The desired output is: "Displaying greek letter delta as a symbol: Δ"

Here is a minimal example:

library(shiny)

ui <- fluidPage(
  textOutput("text")
)

server <- function(input, output, session) {
  output$text <- renderText({
    HTML("Displaying greek letter delta as a symbol: \u0394")
  })
}

shinyApp(ui, server)

Upvotes: 3

Views: 1197

Answers (1)

Paul
Paul

Reputation: 2977

Important: if you need to use HTML elements such as <br>, you will need to follow @Stéphane Laurent's comment and use renderUi() and uiOutput().

library(shiny)

ui <- fluidPage(
  uiOutput("text")
)

server <- function(input, output, session) {
  output$text <- renderUI({
    HTML("<p> Displaying greek letter delta as a symbol:<br> \u0394 
         </p>")
  })
}

shinyApp(ui, server)

Created on 2022-06-01 by the reprex package (v2.0.1)

With:

R version 4.2.0 (2022-04-22 ucrt)
shiny_1.7.1
Running under: Windows 10 x64 (build 19044)

Upvotes: 2

Related Questions