[AJAX] AJAX et

Bonjour à tous,
J'essaye de modifier un script d'upload en drag & drop, et j'aimerai maintenant envoyer une info supplémentaire à ma page php qui traite l'envoi.
En fait, j'ai créé un id nommé idunique que j'aimerai envoyer en même temps pour chaque envoi (il s'incrémente aussi pour chaque fichier).
Je pense que c'est la fonction send() que se situe mon problème, mais après avoir lu des cours d'ajax, je n'ai toujours pas réussi à trouver l'endroit où ajouter ma variable...
Si vous pouvez m'aider, merci d'avance !
Je vous joint le code de send():

Code:

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        function send(e) {
            // Sometimes the index is not attached to the
            // event object. Find it by size. Hack for sure.
            if (e.target.index == undefined) {
                e.target.index = getIndexBySize(e.total);
            }
 
            var xhr = new XMLHttpRequest(),
                upload = xhr.upload,
                file = files[e.target.index],
                index = e.target.index,
                start_time = new Date().getTime(),
                boundary = '------multipartformboundary' + (new Date).getTime(),
                builder;
 
            newName = rename(file.name);
            if (typeof newName === "string") {
                builder = getBuilder(newName, e.target.result, boundary);
            } else {
                builder = getBuilder(file.name, e.target.result, boundary);
            }
 
            upload.index = index;
            upload.file = file;
            upload.downloadStartTime = start_time;
            upload.currentStart = start_time;
            upload.currentProgress = 0;
            upload.startData = 0;
            upload.addEventListener("progress", progress, false);
 
            xhr.open("POST", opts.url, true);
            xhr.setRequestHeader('content-type', 'multipart/form-data; boundary='
                + boundary);
 
            xhr.sendAsBinary(builder); 
 
            opts.uploadStarted(index, file, files_count); 
 
            xhr.onload = function() {
                if (xhr.responseText) {
                var now = new Date().getTime(),
                    timeDiff = now - start_time,
                    result = opts.uploadFinished(e.target.index, file, jQuery.parseJSON(xhr.responseText), timeDiff);
                    filesDone++;
                    if (filesDone == files_count - filesRejected) {
                        afterAll();
                    }
                if (result === false) stop_loop = true;
                }
            };
        }

Et si il faut: les deux fichiers javascript:

Code:

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(function($){
    jQuery.event.props.push("dataTransfer");
    var opts = {},
        default_opts = {
            url: '',
            refresh: 1000,
            paramname: 'userfile',
            maxfiles: 5,
            maxfilesize: 1, // MBs
            data: {},
            drop: empty,
            dragEnter: empty,
            dragOver: empty,
            dragLeave: empty,
            docEnter: empty,
            docOver: empty,
            docLeave: empty,
            beforeEach: empty,
            afterAll: empty,
            rename: empty,
            error: function(err, file, i){alert(err);},
            uploadStarted: empty,
            uploadFinished: empty,
            progressUpdated: empty,
            speedUpdated: empty
        },
        errors = ["BrowserNotSupported", "TooManyFiles", "FileTooLarge"],
        doc_leave_timer,
        stop_loop = false,
        files_count = 0,
        files;
 
    $.fn.filedrop = function(options) {
        opts = $.extend( {}, default_opts, options );
 
        this.bind('drop', drop).bind('dragenter', dragEnter).bind('dragover', dragOver).bind('dragleave', dragLeave);
        $(document).bind('drop', docDrop).bind('dragenter', docEnter).bind('dragover', docOver).bind('dragleave', docLeave);
    };
 
    function drop(e) {
        opts.drop(e);
        files = e.dataTransfer.files;
        if (files === null || files === undefined) {
            opts.error(errors[0]);
            return false;
        }
        files_count = files.length + compteur;
        if(files_count<6){
            compteur=files_count;
        }
        upload();
        e.preventDefault();
        return false;
    }
 
    function getBuilder(filename, filedata, boundary) {
        var dashdash = '--',
            crlf = '\r\n',
            builder = '';
 
        $.each(opts.data, function(i, val) {
            if (typeof val === 'function') val = val();
            builder += dashdash;
            builder += boundary;
            builder += crlf;
            builder += 'Content-Disposition: form-data; name="'+i+'"';
            builder += crlf;
            builder += crlf;
            builder += val;
            builder += crlf;
        });
 
        builder += dashdash;
        builder += boundary;
        builder += crlf;
        builder += 'Content-Disposition: form-data; name="'+opts.paramname+'"';
        builder += '; filename="' + filename + '"';
        builder += crlf;
 
        builder += 'Content-Type: application/octet-stream';
        builder += crlf;
        builder += crlf;
 
        builder += filedata;
        builder += crlf;
 
        builder += dashdash;
        builder += boundary;
        builder += dashdash;
        builder += crlf;
        return builder;
    }
 
    function progress(e) {
        if (e.lengthComputable) {
            var percentage = Math.round((e.loaded * 100) / e.total);
            if (this.currentProgress != percentage) {
 
                this.currentProgress = percentage;
                opts.progressUpdated(this.index, this.file, this.currentProgress);
 
                var elapsed = new Date().getTime();
                var diffTime = elapsed - this.currentStart;
                if (diffTime >= opts.refresh) {
                    var diffData = e.loaded - this.startData;
                    var speed = diffData / diffTime; // KB per second
                    opts.speedUpdated(this.index, this.file, speed);
                    this.startData = e.loaded;
                    this.currentStart = elapsed;
                }
            }
        }
    }
 
 
 
    function upload() {
        stop_loop = false;
        if (!files) {
            opts.error(errors[0]);
            return false;
        }
        var filesDone = 0,
            filesRejected = 0;
 
        if (files_count > opts.maxfiles) {
            opts.error(errors[1]);
            return false;
        }
 
        for (var i=0; i<files_count; i++) {
            if (stop_loop) return false;
            try {
                if (beforeEach(files[i]) != false) {
                    if (i === files_count) return;
                    var reader = new FileReader(),
                        max_file_size = 1048576 * opts.maxfilesize;
                        reader.index = i;
                    if (files[i].size > max_file_size) {
                        opts.error(errors[2], files[i], i);
                        filesRejected++;
                        continue;
                    }
 
                    reader.onloadend = send;
                    reader.readAsBinaryString(files[i]);
                } else {
                    filesRejected++;
                }
            } catch(err) {
                opts.error(errors[0]);
                return false;
            }
        }
 
        function send(e) {
            // Sometimes the index is not attached to the
            // event object. Find it by size. Hack for sure.
            if (e.target.index == undefined) {
                e.target.index = getIndexBySize(e.total);
            }
 
            var xhr = new XMLHttpRequest(),
                upload = xhr.upload,
                file = files[e.target.index],
                index = e.target.index,
                start_time = new Date().getTime(),
                boundary = '------multipartformboundary' + (new Date).getTime(),
                builder;
 
            newName = rename(file.name);
            if (typeof newName === "string") {
                builder = getBuilder(newName, e.target.result, boundary);
            } else {
                builder = getBuilder(file.name, e.target.result, boundary);
            }
 
            upload.index = index;
            upload.file = file;
            upload.downloadStartTime = start_time;
            upload.currentStart = start_time;
            upload.currentProgress = 0;
            upload.startData = 0;
            upload.addEventListener("progress", progress, false);
 
            xhr.open("POST", opts.url, true);
            xhr.setRequestHeader('content-type', 'multipart/form-data; boundary='
                + boundary);
 
            xhr.sendAsBinary(builder); 
 
            opts.uploadStarted(index, file, files_count); 
 
            xhr.onload = function() {
                if (xhr.responseText) {
                var now = new Date().getTime(),
                    timeDiff = now - start_time,
                    result = opts.uploadFinished(e.target.index, file, jQuery.parseJSON(xhr.responseText), timeDiff);
                    filesDone++;
                    if (filesDone == files_count - filesRejected) {
                        afterAll();
                    }
                if (result === false) stop_loop = true;
                }
            };
        }
    }
 
    function getIndexBySize(size) {
        for (var i=0; i < files_count; i++) {
            if (files[i].size == size) {
                return i;
            }
        }
 
        return undefined;
    }
 
    function rename(name) {
        return opts.rename(name);
    }
 
    function beforeEach(file) {
        return opts.beforeEach(file);
    }
 
    function afterAll() {
        return opts.afterAll();
    }
 
    function dragEnter(e) {
        clearTimeout(doc_leave_timer);
        e.preventDefault();
        opts.dragEnter(e);
    }
 
    function dragOver(e) {
        clearTimeout(doc_leave_timer);
        e.preventDefault();
        opts.docOver(e);
        opts.dragOver(e);
    }
 
    function dragLeave(e) {
        clearTimeout(doc_leave_timer);
        opts.dragLeave(e);
        e.stopPropagation();
    }
 
    function docDrop(e) {
        e.preventDefault();
        opts.docLeave(e);
        return false;
    }
 
    function docEnter(e) {
        clearTimeout(doc_leave_timer);
        e.preventDefault();
        opts.docEnter(e);
        return false;
    }
 
    function docOver(e) {
        clearTimeout(doc_leave_timer);
        e.preventDefault();
        opts.docOver(e);
        return false;
    }
 
    function docLeave(e) {
        doc_leave_timer = setTimeout(function(){
            opts.docLeave(e);
        }, 200);
    }
 
    function empty(){}
 
    try {
        if (XMLHttpRequest.prototype.sendAsBinary) return;
        XMLHttpRequest.prototype.sendAsBinary = function(datastr) {
            function byteValue(x) {
                return x.charCodeAt(0) & 0xff;
            }
            var ords = Array.prototype.map.call(datastr, byteValue);
            var ui8a = new Uint8Array(ords);
            this.send(ui8a.buffer);
        }
    } catch(e) {}
 
 
})(jQuery);

et:

Code:

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$(function(){
 
    var dropbox = $('#dropbox'),
        message = $('.message', dropbox);
 
    dropbox.filedrop({
        // The name of the $_FILES entry:
        paramname:'pic',
 
        maxfiles: 5,
        maxfilesize: 2,
        url: 'include/post_file.php?id='+escape(id),
 
        uploadFinished:function(i,file,response){
            $.data(file).addClass('done');
            $.data(file).attr('id','upload'+idunique);
            $.data(file).append('<div id="suppr_upload" onclick="suppr_upload('+idunique+')"></div>');
            idunique++;
 
            // response is the JSON object that post_file.php returns
        },
 
        error: function(err, file) {
            switch(err) {
                case 'BrowserNotSupported':
                    showMessage('Your browser does not support HTML5 file uploads!');
                    break;
                case 'TooManyFiles':
                    alert('Too many files! Please select 5 at most! (configurable)');
                    break;
                case 'FileTooLarge':
                    alert(file.name+' is too large! Please upload files up to 2mb (configurable).');
                    break;
                default:
                    break;
            }
        },
 
        // Called before each upload is started
        beforeEach: function(file){
            if(!file.type.match(/^image\//)){
                alert('Only images are allowed!');
 
                // Returning false will cause the
                // file to be rejected
                return false;
            }
        },
 
        uploadStarted:function(i, file, len){
            createImage(file);
        },
 
        progressUpdated: function(i, file, progress) {
            $.data(file).find('.progress').width(progress);
        }
 
    });
 
    var template = '<div class="preview">'+
                        '<span class="imageHolder">'+
                            '<img />'+
                            '<span class="uploaded"></span>'+
                        '</span>'+
                        '<div class="progressHolder">'+
                            '<div class="progress"></div>'+
                        '</div>'+
                    '</div>';
 
 
    function createImage(file){
 
        var preview = $(template),
            image = $('img', preview);
 
        var reader = new FileReader();
 
        image.width = 100;
        image.height = 100;
 
        reader.onload = function(e){
 
            // e.target.result holds the DataURL which
            // can be used as a source of the image:
 
            image.attr('src',e.target.result);
        };
 
        // Reading the file as a DataURL. When finished,
        // this will trigger the onload function above:
        reader.readAsDataURL(file);
 
        message.hide();
        preview.appendTo(dropbox);
 
        // Associating a preview container
        // with the file, using jQuery's $.data():
 
        $.data(file,preview);
    }
 
    function showMessage(msg){
        message.html(msg);
    }
 
});
idunique=1;
compteur=0;
 
    function suppr_upload(i) {
 
        $.get('include/suppr_upload.php?id='+escape(id)+'&un='+escape(i), function(data) {
  alert("Data Loaded: " + data);
});
        compteur=compteur-1;
        $('#upload'+i).remove();
 
    }

[AJAX] AJAX et _POST