AJAX Multi-File Upload With Image Preview and Sort [Under Development]

I was looking into making this possible but I got stuck on the way.

1	<input type = "file" />

I believe the above code is the culprit on this Project since the way it store the files is randomized, therefore making it almost impossible to re-sort the images inside it.

The Codes bellow will work most of the time, and sometimes it will fail due to queueing issues on the input file.

Client Script

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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Upload images with Jquery</title>
<link rel="stylesheet" type="text/css" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css" />

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script type="text/javascript" src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/js/bootstrap.min.js"></script>
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/bootbox.js/4.3.0/bootbox.min.js"></script> <script type="text/javascript" src="jquery-2.1.3.min.js"></script>
<script type="text/javascript" src="jquery-ui.js"></script>

<style>
ul.cvf_uploaded_files {list-style-type: none; margin: 20px 0 0 0; padding: 0;}
ul.cvf_uploaded_files li {background-color: #fff; border: 1px solid #ccc; border-radius: 5px; float: left; margin: 20px 20px 0 0; padding: 2px; width: 150px; height: 150px; line-height: 150px; position: relative;}
ul.cvf_uploaded_files li img.img-thumb {width: 150px; height: 150px;}
ul.cvf_uploaded_files .ui-selected {background: red;}
ul.cvf_uploaded_files .highlight {border: 1px dashed #000; width: 150px; background-color: #ccc; border-radius: 5px;}
ul.cvf_uploaded_files .delete-btn {width: 24px; border: 0; position: absolute; top: -12px; right: -14px;}
.bg-success {padding: 7px;}
</style>
<script type="text/javascript">
jQuery(document).ready(function() {

var storedFiles = [];
//$('.cvf_order').hide();

// Apply sort function
function cvf_reload_order() {
var order = $('.cvf_uploaded_files').sortable('toArray', {attribute: 'item'});
$('.cvf_hidden_field').val(order);
}

function cvf_add_order() {
$('.cvf_uploaded_files li').each(function(n) {
$(this).attr('item', n);
});
console.log('test');
}

$(function() {
$('.cvf_uploaded_files').sortable({
cursor: 'move',
placeholder: 'highlight',
start: function (event, ui) {
ui.item.toggleClass('highlight');
},
stop: function (event, ui) {
ui.item.toggleClass('highlight');
},
update: function () {
//cvf_reload_order();
},
create:function(){
var list = this;
resize = function(){
$(list).css('height','auto');
$(list).height($(list).height());
};
$(list).height($(list).height());
$(list).find('img').load(resize).error(resize);
}
});
$('.cvf_uploaded_files').disableSelection();
});

$('body').on('change', '.user_picked_files', function() {

var files = this.files;
var i = 0;

for (i = 0; i < files.length; i++) {
var readImg = new FileReader();
var file = files[i];

if (file.type.match('image.*')){
storedFiles.push(file);
readImg.onload = (function(file) {
return function(e) {
$('.cvf_uploaded_files').append(
"<li file = '" + file.name + "'>" +
"<img class = 'img-thumb' src = '" + e.target.result + "' />" +
"<a href = '#' class = 'cvf_delete_image' title = 'Cancel'><img class = 'delete-btn' src = 'delete-btn.png' /></a>" +
"</li>"
);
};
})(file);
readImg.readAsDataURL(file);

} else {
alert('the file '+ file.name + ' is not an image<br/>');
}

if(files.length === (i+1)){
setTimeout(function(){
cvf_add_order();
}, 1000);
}
}
});

// Delete Image from Queue
$('body').on('click','a.cvf_delete_image',function(e){
e.preventDefault();
$(this).parent().remove('');

var file = $(this).parent().attr('file');
for(var i = 0; i < storedFiles.length; i++) {
if(storedFiles[i].name == file) {
storedFiles.splice(i, 1);
break;
}
}

//cvf_reload_order();

});

// AJAX Upload
$('body').on('click', '.cvf_upload_btn', function(e){

e.preventDefault();
cvf_reload_order();

//$(".cvf_uploaded_files").html('<p><img src = "loading.gif" class = "loader" /></p>');
var data = new FormData();

var items_array = $('.cvf_hidden_field').val();
var items = items_array.split(',');

for (var i in items){
var item_number = items[i];
data.append('files' + i, storedFiles[item_number]);
}

$.ajax({
url: 'upload.php',
type: 'POST',
contentType: false,
data: data,
processData: false,
cache: false,
success: function(response, textStatus, jqXHR) {
//$(".cvf_uploaded_files").html('');
//bootbox.alert('<br /><p class = "bg-success">File(s) uploaded successfully.</p>');
alert(jqXHR.responseText);
}
});

});

});
</script>
</head>
<body>
<div class = "container-fluid">
<h3>Sort Files before upload</h3>
<br />
<div class = "col-md-6">

<div class = "form-group">
<label>Select Images</label>
<input type = "file" name = "upload" multiple = "multiple" class = "form-control user_picked_files" />
</div>

<div class = "form-group cvf_order">
<label>Order</label>
<input type = "text" class = "form-control cvf_hidden_field" value = "" disabled = "disabled" />
</div>

<input type = "submit" class = "cvf_upload_btn btn btn-primary" value = "Upload" />

<ul class = "cvf_uploaded_files"></ul>

</div>
</div>
</body>
</html>

Server Script (upload.php)

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<?php

if(isset($_FILES)){

$i = 1;
foreach($_FILES as $key => $data){

if (move_uploaded_file($data['tmp_name'], __DIR__ . '/uploads/' . $i . '--' . $data['name'])) {
//echo "success";
print_r($data['name']);
} else {
//echo "error";
}

$i++;
}
}

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