Ajax progress with PHP session
- by FFish
I have an app that processes images and use jQuery to display progress to the user.
I done this with writing to a textfile each time and image is processed and than read this status with a setInterval.
Because no images are actually written in the processing (I do it in PHP's memory) I thought a log.txt would be a solution, but I am not sure about all the fopen and fread's. Is this prone to issues?
I tried also with PHP sessions, but can't seem to get it to work, I don't get why..
HTML:
<a class="download" href="#">request download</a>
<p class="message"></p>
JS:
$('a.download').click(function() {
var queryData = {images : ["001.jpg", "002.jpg", "003.jpg"]};
$("p.message").html("initializing...");
var progressCheck = function() {
$.get("dynamic-session-progress.php",
function(data) {
$("p.message").html(data);
}
);
};
$.post('dynamic-session-process.php', queryData,
function(intvalId) {
return function(data) {
$("p.message").html(data);
clearInterval(intvalId);
}
} (setInterval(progressCheck, 1000))
);
return false;
});
process.php:
// session_start();
$arr = $_POST['images'];
$arr_cnt = count($arr);
$filename = "log.txt";
for ($i = 1; $i <= $arr_cnt; $i++) {
$content = "processing $val ($i/$arr_cnt)";
$handle = fopen($filename, 'w');
fwrite($handle, $content);
fclose($handle);
// $_SESSION['counter'] = $content;
sleep(3); // to mimic image processing
}
echo "<a href='#'>download zip</a>";
progress.php:
// session_start();
$filename = "log.txt";
$handle = fopen($filename, "r");
$contents = fread($handle, filesize($filename));
fclose($handle);
echo $contents;
// echo $_SESSION['counter'];
