jQuery HTML5 file drag and drop

I have looked at many scripts for uploading images to the server with AJAX with drag and drop. The scripts I found are not jQuery, are quite large and don't do exactly what I want.

In the future it should upload an image with jQuery, AJAX and PHP.

My question

In many of the example I've looked at e.dataTransfer.files work. In my case it don't. Do I need to bind it somehow?

I want jQuery as much as possible.

JsFiddle

Play around as much as you like...

http://jsfiddle.net/AMjEz/

Code

<html>
    <head>
        <style type="text/css">
            #dropzone {
                border: 2px dashed #ccc;
                width: 300px;
                height: 200px;
            }
        </style>
        <script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
        <script type="text/javascript">
            jQuery(document).ready(function($) {
                $('#dropzone').on({
                    dragenter: function(e) {
                        $(this).css('background-color', 'lightBlue');
                    },
                    dragleave: function(e) {
                        $(this).css('background-color', 'white');
                    },
                    drop: function(e) {
                        e.stopPropagation();
                        e.preventDefault();
                        console.log(e.dataTransfer.files);
                    }
                });
            });
        </script>
    </head>
    <body>
        <div id="dropzone">
            Drop files here
        </div>
    </body>
</html>

Solution

I found out that it's a bug in jQuery.1.8. This row should be before $('.dropzone').

$.event.props.push('dataTransfer');

Final HTML code

<html>
    <head>
        <style type="text/css">
            .dropzone {
                border: 2px dashed #ccc;
                width: 300px;
                height: 200px;
            }
        </style>
        <script src="//ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
        <script type="text/javascript">
            jQuery(document).ready(function($) {
                var filename = '';
                var image_data = '';

                $.event.props.push('dataTransfer');
                $('.dropzone').on({
                    dragenter: function(e) {
                        $(this).css('background-color', 'lightBlue');
                    },
                    dragleave: function(e) {
                        $(this).css('background-color', 'white');
                    },
                    drop: function(e) {
                        e.stopPropagation();
                        e.preventDefault();

                        var file = e.dataTransfer.files[0];
                        var fileReader = new FileReader();

                        var this_obj = $(this);

                        fileReader.onload = (function(file) {
                            return function(event) {
                                // Preview
                                filename = file.name;
                                image_data = event.target.result;
                                $(this_obj).next().html('<a href="#" class="upload-file">Upload file</a>');
                                $(this_obj).html('<img style="max-width: 200px; max-height: 200px;" src="' + event.target.result + '">');
                            };
                        })(file);

                        fileReader.readAsDataURL(file);         
                    }
                });

                // Upload file
                $(".upload-file").live("click", function(e){
                    e.preventDefault();

                    var this_obj = $(this);
                    var image_data = $(this_obj).parent().prev().find('img').attr('src');

                    $.post(
                        'send_image.php',
                        {
                            data: image_data,
                            filename: filename
                        }, function(response){  
                            $(this_obj).parent().prev().html(response);
                            $(this_obj).remove();
                        }
                    );

                    //console.log('ok');
                });

            });
        </script>
    </head>
    <body>
        <!-- Multiple dropzones -->
        <div class="dropzone">
            Drop files here
        </div>
        <div id="meta"></div>
        <div class="dropzone">
            Drop files here
        </div>
        <div id="meta"></div>
    </body>
</html>

PHP code in send_image.php

<?php
$raw_data = $_POST['data'];

file_put_contents(
    'image123.jpg',
    base64_decode( 
        str_replace('data:image/jpeg;base64,', '', $raw_data)
    )
);
?>

<br>

<?php echo '<img style="max-width: 200px; max-height: 200px;" src="' . 'image123.jpg' . '">'; ?>