Shiny and JavaScript interaction with session$sendCustomMessage

If I use the session$sendCustomMessage command in my server file and input a list of three things, how do I access the three different things in my message-handler.js file?

Say my call looks like this:

session$sendCustomMessage(type='testmessage', message=list(pid=pid, cid=cid, query=sql))  

In my .js file I want to use pid, cid and query seperately, any ideas on how I do that?



You would access them as, message.cid etc. The list is passed as JSON. An example adapted from

  list(ui = fluidPage(
    titlePanel("sendCustomMessage example"),
      column(4, wellPanel(
        sliderInput("controller", "Controller:",
                    min = 1, max = 20, value = 15),
  function(message) {
    alert("The b variable is " + message.b);
  , server = function(input, output, session){
      session$sendCustomMessage(type = 'testmessage',
                                message = list(a = 1, b = 'text',
                                               controller = input$controller))

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