!7

html {

  if (eq(uri, "/worker.js"))

    ret [[

      addEventListener('message', function(e) {

        var startValue = e.data, i = startValue;

        postMessage("WORKING!");

        var startTime = new Date();

        while (true) {

          i = i+1;

          if ((i % 1000000) == 0) {

            var ms = new Date()-startTime;

            var mips = ((i-startValue)/ms/1000).toFixed(2);

            postMessage("Counted to: " + i + " in " + ms + " ms ("

              + mips + " million steps/s)");

            if (ms >= 4000) {

              postMessage(["continue", i]);

              break;

            }

          }

        }

      });

    ]];

  ret htitle("Web Worker Test")

    + hbody(

      p("Count numbers: " + hfulltag("output", "", id := "result"))

    + p(hbutton("Restart Worker", onClick := "restart()"))

    + p(hbutton("Dummy Button"))

  + hjavascript([[

    var worker;

    function restart() {

      worker.terminate();

      go();

    }

    function go() {

      cont(0);

    }

    function cont(i) {

      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) {

        var e = event.data;

        if (typeof(e) == "object" && e[0] == 'continue') {

          worker.terminate();

          //setTimeout(function() { cont(e[1]) }, 1000);

          cont(e[1]);

        } else

          document.getElementById("result").innerHTML = event.data;

      };

      worker.postMessage(i);

    }

  ]]).replace("$LINK", jsQuote(relativeRawBotLink(programID(), "worker.js"))), onLoad := "go()");

}