Determining what the sessions browser is

shiny
1

Hi there,

I was wondering if there was a way to determine what browser e.g. Chrome/Safari/Firefox, your Shiny app is running in?

I ask because I'm using https://github.com/rowanwins/leaflet-easyPrint but it only supports Chrome + Firefox. I'd like to disable/hide the ui element related to the plugin if the browser isn't supported.

Many thanks,

Ciaran

2

I think it's not available directly via shiny, but you need to add some javascript for it. A very basic solution could look like below. Notice: this check is not perfect since a user might manually change the useragent name.

check.js

$(document).on('shiny:sessioninitialized', function(event) {
  var isChrome = /Chrome/.test(navigator.userAgent);
  var isFirefox = /Firefox/.test(navigator.userAgent);
  var message = {data : [isChrome, isFirefox] };
  Shiny.onInputChange("check", message);
});

app.R

library(shiny)
ui <-shinyUI(
  bootstrapPage(
    includeScript("www/check.js"),
    textOutput("text")
  )
)
server <- shinyServer(function(input,output,session){
  output$text <- renderText({
    paste("Chrome, Firefox:", input$check)
  })
})
shinyApp(ui = ui, server = server)