R Shiny key input binding

Question

In a Shiny application, is it possible to have a binding that listens to what key a user presses down?

I\'m not too familiar with JavaScript, but I\'m looking for s

Answer 1

I've been working on an R package {keys} to solve this problem. It's basically a wrapper around the Mousetrap javascript library. With this, observing keys is an easy task:

library(shiny)
library(keys)

hotkeys <- c(
  "1", 
  "command+shift+k", 
  "up up down down left right left right b a enter"
)

ui <- fluidPage(
  useKeys(),
  keysInput("keys", hotkeys)
)

server <- function(input, output, session) {
  observeEvent(input$keys, {
    print(input$keys)
  })
}

shinyApp(ui, server)

More information here: https://github.com/r4fun/keys