!7

html {
  if (eq(uri, "/worker.js"))
    ret [[
      postMessage("WORKING! Watch your CPU.");
      var startTime = new Date();
      var start = 0, i = start;
      while (true) {
        for (j = 0; j < 1000; j++) {}
        i = i+1;
        if ((i % 1000) == 0) {
          var ms = new Date()-startTime;
          var mips = ((i-start)/ms).toFixed(2);
          postMessage("Counted to: " + i + " in " + ms + " ms ("
            + mips + " million steps/s)");
        }
      }
    ]];
    
  ret htitle("Web Worker Test")
    + hbody(
      p("Count numbers: " + hfulltag("output", "", id := "result"))
    + p(hbutton("Restart Worker", onClick := "restart()"))
  + hjavascript([[
    var worker;
    
    function restart() {
      worker.terminate();
      go();
    }
    
    function go() {
      if (typeof(Worker) === "undefined") {
        document.getElementById("result").innerHTML = "Sorry, your browser does not support Web Workers...";
        return;
      }
      document.getElementById("result").innerHTML = "Making web worker";
      worker = new Worker($LINK);
      worker.onmessage = function(event) {
        document.getElementById("result").innerHTML = event.data;
      };
      //document.getElementById("result").innerHTML = "Worker made, starting";
      //worker.postMessage();
    }
  ]]).replace("$LINK", jsQuote(relativeRawBotLink(programID(), "worker.js"))), onLoad := "go()");
}