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Editorial Team
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Asked: 2026-06-17T06:34:07+00:00

I am a newcomer to Javascript and web programming in general. I am trying

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I am a newcomer to Javascript and web programming in general. I am trying to figure out web workers, and have the following code (running in chrome):

worker_example.html

<!DOCTYPE html>
<html>
    <head>
        <script type="text/javascript" src="worker_example.js"></script>
    </head>
<html>

worker_example.js

var worker = new Worker("worker.js");

worker.addEventListener('message', function(e) {
    document.write("hello");
}, false);

worker.postMessage("");

worker.js

// self.postMessage("");

My question is why doesn’t worker.postMessage("") trigger the event? If I uncomment the single line in worker.js, however, everything works fine.

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1 Answer

  1. Editorial Team

    The event listener attached to worker listens for messages coming from the worker to the parent page. You need to register a listener in the worker as well.

    parent.js

    var worker = new Worker('worker.js');

worker.addEventListener('message', function (e) {
  console.log(e.data);
});

worker.postMessage('marco');

    worker.js

    self.addEventListener('message', function (e) {
  self.postMessage(e.data + ' polo');
});
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