Detect if Download is Complete
- by user604138
I have a very simple and standard PHP force download script.
How do I check if/when the download has completed in order to notify the user on the clientside? I don't even need to show the progress in real time, I am only interested in the very specific event: "when the download completes". Based on my research, it seems like it would have to be determined from the serverside as there is noondownloadready event and I don't think it is possible to intercept browser events.
So it seems that my best bet would be to compare bytes sent to total bytes with some sort of clientside/severside interaction. How would I go about checking the bytes sent from the server for a PHP forced download? is there some sort of global PHP variable that store these data that I can ping with AJAX?
<?php
header("Content-Type: video/x-msvideo");
header("Content-Disposition: attachment; filename=\"".basename($realpath)."\";");
...
$chunksize = 1 * (1024 * 1024); // how many bytes per chunk
if ($size > $chunksize) {
$handle = fopen($realpath, 'rb');
$buffer = '';
while (!feof($handle)) {
$buffer = fread($handle, $chunksize);
echo $buffer;
ob_flush();
flush();
}
fclose($handle);
}
else {
readfile($realpath);
}
exit();
?>
The reason I need this:
For the project I am working on, it is required that after the download starts, the page redirects to (or displays) a "please wait while the download completes" page. Then, once it is complete, it should redirect to (or display) a "Your download is complete, thank you" page. I am open to other ideas that would achieve the same result.
