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    <p>Have you tried <code>xhr.upload.onprogress</code> instead of <code>xhr.onprogress</code>?</p> <p>If that doesn't work too, you could establish another JavaScript AJAX call, like you said. Recently, I've made an upload system that read the file line per line, and it needed to show some extra information about the upload, and not just the percentage, so I did something like this:</p> <ul> <li>The main page makes an AJAX request to a file responsible to process the file</li> <li>In that file, I had to close the connection, so the AJAX request could complete, but the PHP script would still be running, using this:</li> </ul> <pre class="lang-php prettyprint-override"><code>ob_start(); $file = tempnam('/tmp', uniqid()); // create a temp file to show status of the action echo json_encode(array('file' =&gt; $file)); header('Content-length: '.ob_get_length()); header('Connection: close'); ob_end_flush(); flush(); // The AJAX request is completed here, but the script is still running... function writeToFile($handle, $arr) { ftruncate($handle, 0); // empty file fwrite($handle, json_encode($arr)); } $handle = fopen($file, 'w'); while (readLine($uploadedFile)) { // code to process line writeToFile($handle, array('progress' =&gt; $current / $total, 'action' =&gt; 'Reading...')); } // insert into database writeToFile($handle, array('progress' =&gt; '100', 'action' =&gt; 'Inserting into database...')); fclose($handle); </code></pre> <ul> <li>At the main page, the AJAX request would return the name of the file that contains the information, so I would create several GET requests to that file, using <code>setInterval</code> method</li> </ul> <p><em><strong>Note:</strong> in my case, I created another PHP file to show the contents of the progress file (with <code>file_get_contents</code>), so I could manually delete that file when the operation completes</em></p>
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    1. COHi, +1 and thanks for your response. What you write makes perfect sense. To answer your question, no, I haven't tried `xhr.upload.onprogress` but I will give it a try. Meanwhile, I was able to implement the progress bar with additional AJAX calls. I do not like, that for every progress bar, I have to issue several, even hundreds of AJAX calls. I therefore study subjects like COMET and AJAX Long Polling, which establish one permanent connection between the server and the client, and can more precisely update the progress bar. I'm studying it now, so I will see if it is applicable.
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    2. COI have to tell you, that i've just tried `xhr.upload.onprogress` instead of `xhr.onprogress` and it made all the difference. `xhr.upload.onprogress` **works just great**. Although I do not understand the difference, I thank you very much for this great tip, and I am marking your answer as the *Acceptable Answer* to my question. Thank you again!
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