app_json.R

#' This script demonstrates how to use shiny.i18n
#' with JSON translation files.

library(shiny)
library(shiny.i18n)

# File with translations
i18n <- Translator$new(translation_json_path = "../data/translation.json")

# Change this to en or comment this line
i18n$set_translation_language("pl")

ui <- shinyUI(fluidPage(
  titlePanel(i18n$t("Hello Shiny!")),
  sidebarLayout(
    sidebarPanel(
      sliderInput("bins",
                  i18n$t("Number of bins:"),
                  min = 1,
                  max = 50,
                  value = 30)
    ),
    mainPanel(
      plotOutput("distPlot"),
      p(i18n$t("This is description of the plot."))
    )
  )
))

server <- function(input, output) {

  output$distPlot <- renderPlot({
    x    <- faithful[, 2]
    bins <- seq(min(x), max(x), length.out = input$bins + 1)
    hist(x, breaks = bins,
         col = "darkgray", border = "white",
         main = i18n$t("Histogram of x"), ylab = i18n$t("Frequency"))
  })
}

shinyApp(ui = ui, server = server)