Quelle  eventDispatch_worker.js   Sprache: JAVA

/**
 * Any copyright is dedicated to the Public Domain.
 * http://creativecommons.org/publicdomain/zero/1.0/
 */
const fakeEventType = "foo";

function testEventTarget(event) {
  if (event.target !== self) {
    throw new Error("Event has a bad target!");
  }
  if (event.currentTarget) {
    throw new Error("Event has a bad currentTarget!");
  }
  postMessage(event.data);
}

addEventListener(
  fakeEventType,
  function (event) {
    throw new Error("Trusted event listener received untrusted event!");
  },
  false,
  false
);

addEventListener(
  fakeEventType,
  function (event) {
    if (event.target !== self || event.currentTarget !== self) {
      throw new Error("Fake event has bad target!");
    }
    if (event.isTrusted) {
      throw new Error("Event should be untrusted!");
    }
    event.stopImmediatePropagation();
    postMessage(event.data);
  },
  false,
  true
);

addEventListener(
  fakeEventType,
  function (event) {
    throw new Error(
      "This shouldn't get called because of stopImmediatePropagation."
    );
  },
  false,
  true
);

var count = 0;
onmessage = function (event) {
  if (event.target !== self || event.currentTarget !== self) {
    throw new Error("Event has bad target!");
  }

  if (!count++) {
    var exception;
    try {
      self.dispatchEvent(event);
    } catch (e) {
      exception = e;
    }

    if (!exception) {
      throw new Error("Recursive dispatch didn't fail!");
    }

    event = new MessageEvent(fakeEventType, {
      bubbles: event.bubbles,
      cancelable: event.cancelable,
      data: event.data,
      origin: "*",
      source: null,
    });
    self.dispatchEvent(event);

    return;
  }

  setTimeout(testEventTarget, 0, event);
};