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Asked: 2026-06-18T09:53:37+00:00

I am developing a small web application. I have pretty much finished the server

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I am developing a small web application.
I have pretty much finished the server side code, but am struggling with the client side javascript.

I have an html file that is updated every second. This file is fully static and I use it only for log purposes.

The idea is to do pretty much the same thing, but with an auto update done on the client side.

For that I want to use database polling using ajax.

I have implemented a first version here, that simply prints the same html file and is supposed to reload it every second.

The thing is that is doesn’t update, even though I don’t see any error in my javascript console client side.
The file is found, as it loads correctly and I don’t see any reason why it wouldn’t update my div.

Here is my code :

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <!-- Using Google CDN -->
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
    <script>
        (function worker() {
          $.ajax({
            url : 'http://jlengrand.pythonanywhere.com/static/leader.html',
            success: function(data) {
              $('.text').html(data);
            },
            complete: function() {
              setTimeout(worker, 1000);
            }
          });
        })();
    </script>
</head>
<body>
    <div class="text">
        To be loaded <br />
    </div>
</body>
</html>

I tried locally (but with a smaller file) and it worked fine.

I know that reloading the whole file is not clever, but I want to build incrementally as this is the first time I develop in JavaScript.

What am I missing?

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1 Answer

  1. Editorial Team

    Error: useless setTimeout call (missing quotes around argument?)

    You run worker inside setTimeout. You need to remove () or you need to put it in ”:

    setTimeout(worker, 1000);

    or

    setTimeout('worker()', 1000);

    *Edit:
    To prevent caching, change url to:

     url : 'http://jlengrand.pythonanywhere.com/static/leader.html?rand='+Math.random(),
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