R Shiny key input binding

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You can add a listener for keypresses. The Shiny.onInputChange can be used to bind the key pressed to a shiny variable:

library(shiny)
runApp( list(ui = bootstrapPage(
  verbatimTextOutput("results"),
  tags$script('
    $(document).on("keypress", function (e) {
       Shiny.onInputChange("mydata", e.which);
    });
  ') 
)
, server = function(input, output, session) {

  output$results = renderPrint({
    input$mydata
  })
}
))

for keydown events you can substitute:

  tags$script('
    $(document).on("keydown", function (e) {
       Shiny.onInputChange("mydata", e.which);
    });
  ')

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