Recently, I was working on implementing a JavaScript/AJAX upload system with a progress indicator based on a tutorial. The process went smoothly, and I even managed to include a CSS progress bar for visual representation. However, I encountered a hurdle that I'm struggling to overcome - adding conditions such as file type, size, and whether the file is set or not. Below is a snippet of my code (upload.php):
<?php
foreach($_FILES['file']['name'] as $key => $name){
if ($_FILES['file']['error'][$key] == 0 && move_uploaded_file($_FILES['file']['tmp_name'][$key], "files/{$name}")){
$uploaded[] = $name;
}
}
if(!empty($_POST['ajax'])){
die(json_encode($uploaded));
}
?>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript" src="upload.js"></script>
</head>
<body>
<div id="uploaded">
<?php
if (!empty($uploaded)){
foreach ($uploaded as $name){
echo '<div><a href="files/',$name,'">',$name,'</a></div>';
}
}
?>
</div>
<div id="upload_progress"></div>
<div>
<form action="" method="post" enctype="multipart/form-data">
<input type="file" id="file" name="file[]" />
<input type="submit" id="submit" value="upload" />
</form>
Furthermore, here is the JavaScript file (upload.js) associated with this project:
var handleUpload = function(event){
event.preventDefault();
event.stopPropagation();
var fileInput = document.getElementById('file');
var data = new FormData();
data.append('ajax', true);
for (var i = 0; i < fileInput.files.length; ++i){
data.append('file[]', fileInput.files[i]);
}
var request = new XMLHttpRequest();
request.upload.addEventListener('progress', function(event){
if(event.lengthComputable){
var percent = event.loaded / event.total;
var progress = document.getElementById('upload_progress');
while (progress.hasChildNodes()){
progress.removeChild(progress.firstChild);
}
progress.appendChild(document.createTextNode(Math.round(percent * 100) +' %'));
document.getElementById("loading-progress-17").style.width= Math.round(percent * 100) +'%';
}
});
request.upload.addEventListener('load', function(event){
document.getElementById('upload_progress').style.display = 'none';
});
request.upload.addEventListener('error', function(event){
alert('Upload failed');
});
request.addEventListener('readystatechange', function(event){
if (this.readyState == 4){
if(this.status == 200){
var links = document.getElementById('uploaded');
var uploaded = eval(this.response);
var div, a;
for (var i = 0; i < uploaded.length; ++i){
div = document.createElement('div');
a = document.createElement('a');
a.setAttribute('href', 'files/' + uploaded[i]);
a.appendChild(document.createTextNode(uploaded[i]));
div.appendChild(a);
links.appendChild(div);
}
}else{
console.log('server replied with HTTP status ' + this.status);
}
}
});
request.open('POST', 'upload.php');
request.setRequestHeader('Cache-Control', 'no-cache');
document.getElementById('upload_progress').style.display = 'block';
request.send(data);
}
window.addEventListener('load', function(event){
var submit = document.getElementById('submit');
submit.addEventListener('click', handleUpload);
});
I am in search of guidance regarding how I can incorporate a condition to check if the file size is under 50MB within this upload system. Any assistance in this matter would be greatly appreciated. Thank you.