issue #44 multi file uploader

1 files changed, 1247 insertions, 0 deletions

diff --git a/lib/scripts/fileuploader.js b/lib/scripts/fileuploader.js
new file mode 100644
index 000000000..5368d9739
--- /dev/null
+++ b/lib/scripts/fileuploader.js
@@ -0,0 +1,1247 @@
+/**
+ * http://github.com/valums/file-uploader
+ *
+ * Multiple file upload component with progress-bar, drag-and-drop.
+ * © 2010 Andrew Valums ( andrew(at)valums.com )
+ *
+ * Licensed under GNU GPL 2 or later and GNU LGPL 2 or later, see license.txt.
+ */
+
+//
+// Helper functions
+//
+
+var qq = qq || {};
+
+/**
+ * Adds all missing properties from second obj to first obj
+ */
+qq.extend = function(first, second){
+    for (var prop in second){
+        first[prop] = second[prop];
+    }
+};
+
+/**
+ * Searches for a given element in the array, returns -1 if it is not present.
+ * @param {Number} [from] The index at which to begin the search
+ */
+qq.indexOf = function(arr, elt, from){
+    if (arr.indexOf) return arr.indexOf(elt, from);
+
+    from = from || 0;
+    var len = arr.length;
+
+    if (from < 0) from += len;
+
+    for (; from < len; from++){
+        if (from in arr && arr[from] === elt){
+            return from;
+        }
+    }
+    return -1;
+};
+
+qq.getUniqueId = (function(){
+    var id = 0;
+    return function(){ return id++; };
+})();
+
+//
+// Events
+
+qq.attach = function(element, type, fn){
+    if (element.addEventListener){
+        element.addEventListener(type, fn, false);
+    } else if (element.attachEvent){
+        element.attachEvent('on' + type, fn);
+    }
+};
+qq.detach = function(element, type, fn){
+    if (element.removeEventListener){
+        element.removeEventListener(type, fn, false);
+    } else if (element.attachEvent){
+        element.detachEvent('on' + type, fn);
+    }
+};
+
+qq.preventDefault = function(e){
+    if (e.preventDefault){
+        e.preventDefault();
+    } else{
+        e.returnValue = false;
+    }
+};
+
+//
+// Node manipulations
+
+/**
+ * Insert node a before node b.
+ */
+qq.insertBefore = function(a, b){
+    b.parentNode.insertBefore(a, b);
+};
+qq.remove = function(element){
+    element.parentNode.removeChild(element);
+};
+
+qq.contains = function(parent, descendant){
+    // compareposition returns false in this case
+    if (parent == descendant) return true;
+
+    if (parent.contains){
+        return parent.contains(descendant);
+    } else {
+        return !!(descendant.compareDocumentPosition(parent) & 8);
+    }
+};
+
+/**
+ * Creates and returns element from html string
+ * Uses innerHTML to create an element
+ */
+qq.toElement = (function(){
+    var div = document.createElement('div');
+    return function(html){
+        div.innerHTML = html;
+        var element = div.firstChild;
+        div.removeChild(element);
+        return element;
+    };
+})();
+
+//
+// Node properties and attributes
+
+/**
+ * Sets styles for an element.
+ * Fixes opacity in IE6-8.
+ */
+qq.css = function(element, styles){
+    if (styles.opacity != null){
+        if (typeof element.style.opacity != 'string' && typeof(element.filters) != 'undefined'){
+            styles.filter = 'alpha(opacity=' + Math.round(100 * styles.opacity) + ')';
+        }
+    }
+    qq.extend(element.style, styles);
+};
+qq.hasClass = function(element, name){
+    var re = new RegExp('(^| )' + name + '( |$)');
+    return re.test(element.className);
+};
+qq.addClass = function(element, name){
+    if (!qq.hasClass(element, name)){
+        element.className += ' ' + name;
+    }
+};
+qq.removeClass = function(element, name){
+    var re = new RegExp('(^| )' + name + '( |$)');
+    element.className = element.className.replace(re, ' ').replace(/^\s+|\s+$/g, "");
+};
+qq.setText = function(element, text){
+    element.innerText = text;
+    element.textContent = text;
+};
+
+//
+// Selecting elements
+
+qq.children = function(element){
+    var children = [],
+    child = element.firstChild;
+
+    while (child){
+        if (child.nodeType == 1){
+            children.push(child);
+        }
+        child = child.nextSibling;
+    }
+
+    return children;
+};
+
+qq.getByClass = function(element, className){
+    if (element.querySelectorAll){
+        return element.querySelectorAll('.' + className);
+    }
+
+    var result = [];
+    var candidates = element.getElementsByTagName("*");
+    var len = candidates.length;
+
+    for (var i = 0; i < len; i++){
+        if (qq.hasClass(candidates[i], className)){
+            result.push(candidates[i]);
+        }
+    }
+    return result;
+};
+
+/**
+ * obj2url() takes a json-object as argument and generates
+ * a querystring. pretty much like jQuery.param()
+ *
+ * how to use:
+ *
+ *    `qq.obj2url({a:'b',c:'d'},'http://any.url/upload?otherParam=value');`
+ *
+ * will result in:
+ *
+ *    `http://any.url/upload?otherParam=value&a=b&c=d`
+ *
+ * @param  Object JSON-Object
+ * @param  String current querystring-part
+ * @return String encoded querystring
+ */
+qq.obj2url = function(obj, temp, prefixDone){
+    var uristrings = [],
+        prefix = '&',
+        add = function(nextObj, i){
+            var nextTemp = temp
+                ? (/\[\]$/.test(temp)) // prevent double-encoding
+                   ? temp
+                   : temp+'['+i+']'
+                : i;
+            if ((nextTemp != 'undefined') && (i != 'undefined')) {
+                uristrings.push(
+                    (typeof nextObj === 'object')
+                        ? qq.obj2url(nextObj, nextTemp, true)
+                        : (Object.prototype.toString.call(nextObj) === '[object Function]')
+                            ? encodeURIComponent(nextTemp) + '=' + encodeURIComponent(nextObj())
+                            : encodeURIComponent(nextTemp) + '=' + encodeURIComponent(nextObj)
+                );
+            }
+        };
+
+    if (!prefixDone && temp) {
+      prefix = (/\?/.test(temp)) ? (/\?$/.test(temp)) ? '' : '&' : '?';
+      uristrings.push(temp);
+      uristrings.push(qq.obj2url(obj));
+    } else if ((Object.prototype.toString.call(obj) === '[object Array]') && (typeof obj != 'undefined') ) {
+        // we wont use a for-in-loop on an array (performance)
+        for (var i = 0, len = obj.length; i < len; ++i){
+            add(obj[i], i);
+        }
+    } else if ((typeof obj != 'undefined') && (obj !== null) && (typeof obj === "object")){
+        // for anything else but a scalar, we will use for-in-loop
+        for (var i in obj){
+            add(obj[i], i);
+        }
+    } else {
+        uristrings.push(encodeURIComponent(temp) + '=' + encodeURIComponent(obj));
+    }
+
+    return uristrings.join(prefix)
+                     .replace(/^&/, '')
+                     .replace(/%20/g, '+');
+};
+
+//
+//
+// Uploader Classes
+//
+//
+
+var qq = qq || {};
+
+/**
+ * Creates upload button, validates upload, but doesn't create file list or dd.
+ */
+qq.FileUploaderBasic = function(o){
+    this._options = {
+        // set to true to see the server response
+        debug: false,
+        action: '/server/upload',
+        params: {},
+        button: null,
+        multiple: true,
+        maxConnections: 3,
+        // validation
+        allowedExtensions: [],
+        sizeLimit: 0,
+        minSizeLimit: 0,
+        // events
+        // return false to cancel submit
+        onSubmit: function(id, fileName){},
+        onProgress: function(id, fileName, loaded, total){},
+        onComplete: function(id, fileName, responseJSON){},
+        onCancel: function(id, fileName){},
+        // messages
+        messages: {
+            typeError: "{file} has invalid extension. Only {extensions} are allowed.",
+            sizeError: "{file} is too large, maximum file size is {sizeLimit}.",
+            minSizeError: "{file} is too small, minimum file size is {minSizeLimit}.",
+            emptyError: "{file} is empty, please select files again without it.",
+            onLeave: "The files are being uploaded, if you leave now the upload will be cancelled."
+        },
+        showMessage: function(message){
+            alert(message);
+        }
+    };
+    qq.extend(this._options, o);
+
+    // number of files being uploaded
+    this._filesInProgress = 0;
+    this._handler = this._createUploadHandler();
+
+    if (this._options.button){
+        this._button = this._createUploadButton(this._options.button);
+    }
+
+    this._preventLeaveInProgress();
+};
+
+qq.FileUploaderBasic.prototype = {
+    setParams: function(params){
+        this._options.params = params;
+    },
+    getInProgress: function(){
+        return this._filesInProgress;
+    },
+    _createUploadButton: function(element){
+        var self = this;
+
+        return new qq.UploadButton({
+            element: element,
+            multiple: this._options.multiple && qq.UploadHandlerXhr.isSupported(),
+            onChange: function(input){
+                self._onInputChange(input);
+            }
+        });
+    },
+    _createUploadHandler: function(){
+        var self = this,
+            handlerClass;
+
+        if(qq.UploadHandlerXhr.isSupported()){
+            handlerClass = 'UploadHandlerXhr';
+        } else {
+            handlerClass = 'UploadHandlerForm';
+        }
+
+        var handler = new qq[handlerClass]({
+            debug: this._options.debug,
+            action: this._options.action,
+            maxConnections: this._options.maxConnections,
+            onProgress: function(id, fileName, loaded, total){
+                self._onProgress(id, fileName, loaded, total);
+                self._options.onProgress(id, fileName, loaded, total);
+            },
+            onComplete: function(id, fileName, result){
+                self._onComplete(id, fileName, result);
+                self._options.onComplete(id, fileName, result);
+            },
+            onCancel: function(id, fileName){
+                self._onCancel(id, fileName);
+                self._options.onCancel(id, fileName);
+            }
+        });
+
+        return handler;
+    },
+    _preventLeaveInProgress: function(){
+        var self = this;
+
+        qq.attach(window, 'beforeunload', function(e){
+            if (!self._filesInProgress){return;}
+
+            var e = e || window.event;
+            // for ie, ff
+            e.returnValue = self._options.messages.onLeave;
+            // for webkit
+            return self._options.messages.onLeave;
+        });
+    },
+    _onSubmit: function(id, fileName){
+        this._filesInProgress++;
+    },
+    _onProgress: function(id, fileName, loaded, total){
+    },
+    _onComplete: function(id, fileName, result){
+        this._filesInProgress--;
+        if (result.error){
+            this._options.showMessage(result.error);
+        }
+    },
+    _onCancel: function(id, fileName){
+        this._filesInProgress--;
+    },
+    _onInputChange: function(input){
+        if (this._handler instanceof qq.UploadHandlerXhr){
+            this._uploadFileList(input.files);
+        } else {
+            if (this._validateFile(input)){
+                this._uploadFile(input);
+            }
+        }
+        this._button.reset();
+    },
+    _uploadFileList: function(files){
+        for (var i=0; i<files.length; i++){
+            if ( !this._validateFile(files[i])){
+                return;
+            }
+        }
+
+        for (var i=0; i<files.length; i++){
+            this._uploadFile(files[i]);
+        }
+    },
+    _uploadFile: function(fileContainer){
+        var id = this._handler.add(fileContainer);
+        var fileName = this._handler.getName(id);
+
+        if (this._options.onSubmit(id, fileName) !== false){
+            this._onSubmit(id, fileName);
+            this._handler.upload(id, this._options.params);
+        }
+    },
+    _validateFile: function(file){
+        var name, size;
+
+        if (file.value){
+            // it is a file input
+            // get input value and remove path to normalize
+            name = file.value.replace(/.*(\/|\\)/, "");
+        } else {
+            // fix missing properties in Safari
+            name = file.fileName != null ? file.fileName : file.name;
+            size = file.fileSize != null ? file.fileSize : file.size;
+        }
+
+        if (! this._isAllowedExtension(name)){
+            this._error('typeError', name);
+            return false;
+
+        } else if (size === 0){
+            this._error('emptyError', name);
+            return false;
+
+        } else if (size && this._options.sizeLimit && size > this._options.sizeLimit){
+            this._error('sizeError', name);
+            return false;
+
+        } else if (size && size < this._options.minSizeLimit){
+            this._error('minSizeError', name);
+            return false;
+        }
+
+        return true;
+    },
+    _error: function(code, fileName){
+        var message = this._options.messages[code];
+        function r(name, replacement){ message = message.replace(name, replacement); }
+
+        r('{file}', this._formatFileName(fileName));
+        r('{extensions}', this._options.allowedExtensions.join(', '));
+        r('{sizeLimit}', this._formatSize(this._options.sizeLimit));
+        r('{minSizeLimit}', this._formatSize(this._options.minSizeLimit));
+
+        this._options.showMessage(message);
+    },
+    _formatFileName: function(name){
+        if (name.length > 33){
+            name = name.slice(0, 19) + '...' + name.slice(-13);
+        }
+        return name;
+    },
+    _isAllowedExtension: function(fileName){
+        var ext = (-1 !== fileName.indexOf('.')) ? fileName.replace(/.*[.]/, '').toLowerCase() : '';
+        var allowed = this._options.allowedExtensions;
+
+        if (!allowed.length){return true;}
+
+        for (var i=0; i<allowed.length; i++){
+            if (allowed[i].toLowerCase() == ext){ return true;}
+        }
+
+        return false;
+    },
+    _formatSize: function(bytes){
+        var i = -1;
+        do {
+            bytes = bytes / 1024;
+            i++;
+        } while (bytes > 99);
+
+        return Math.max(bytes, 0.1).toFixed(1) + ['kB', 'MB', 'GB', 'TB', 'PB', 'EB'][i];
+    }
+};
+
+
+/**
+ * Class that creates upload widget with drag-and-drop and file list
+ * @inherits qq.FileUploaderBasic
+ */
+qq.FileUploader = function(o){
+    // call parent constructor
+    qq.FileUploaderBasic.apply(this, arguments);
+
+    // additional options
+    qq.extend(this._options, {
+        element: null,
+        // if set, will be used instead of qq-upload-list in template
+        listElement: null,
+
+        template: '<div class="qq-uploader">' +
+                '<div class="qq-upload-drop-area"><span>Drop files here to upload</span></div>' +
+                '<div class="qq-upload-button">Upload a file</div>' +
+                '<ul class="qq-upload-list"></ul>' +
+             '</div>',
+
+        // template for one item in file list
+        fileTemplate: '<li>' +
+                '<span class="qq-upload-file"></span>' +
+                '<span class="qq-upload-spinner"></span>' +
+                '<span class="qq-upload-size"></span>' +
+                '<a class="qq-upload-cancel" href="#">Cancel</a>' +
+                '<span class="qq-upload-failed-text">Failed</span>' +
+            '</li>',
+
+        classes: {
+            // used to get elements from templates
+            button: 'qq-upload-button',
+            drop: 'qq-upload-drop-area',
+            dropActive: 'qq-upload-drop-area-active',
+            list: 'qq-upload-list',
+
+            file: 'qq-upload-file',
+            spinner: 'qq-upload-spinner',
+            size: 'qq-upload-size',
+            cancel: 'qq-upload-cancel',
+
+            // added to list item when upload completes
+            // used in css to hide progress spinner
+            success: 'qq-upload-success',
+            fail: 'qq-upload-fail'
+        }
+    });
+    // overwrite options with user supplied
+    qq.extend(this._options, o);
+
+    this._element = this._options.element;
+    this._element.innerHTML = this._options.template;
+    this._listElement = this._options.listElement || this._find(this._element, 'list');
+
+    this._classes = this._options.classes;
+
+    this._button = this._createUploadButton(this._find(this._element, 'button'));
+
+    this._bindCancelEvent();
+    this._setupDragDrop();
+};
+
+// inherit from Basic Uploader
+qq.extend(qq.FileUploader.prototype, qq.FileUploaderBasic.prototype);
+
+qq.extend(qq.FileUploader.prototype, {
+    /**
+     * Gets one of the elements listed in this._options.classes
+     **/
+    _find: function(parent, type){
+        var element = qq.getByClass(parent, this._options.classes[type])[0];
+        if (!element){
+            throw new Error('element not found ' + type);
+        }
+
+        return element;
+    },
+    _setupDragDrop: function(){
+        var self = this,
+            dropArea = this._find(this._element, 'drop');
+
+        var dz = new qq.UploadDropZone({
+            element: dropArea,
+            onEnter: function(e){
+                qq.addClass(dropArea, self._classes.dropActive);
+                e.stopPropagation();
+            },
+            onLeave: function(e){
+                e.stopPropagation();
+            },
+            onLeaveNotDescendants: function(e){
+                qq.removeClass(dropArea, self._classes.dropActive);
+            },
+            onDrop: function(e){
+                dropArea.style.display = 'none';
+                qq.removeClass(dropArea, self._classes.dropActive);
+                self._uploadFileList(e.dataTransfer.files);
+            }
+        });
+
+        dropArea.style.display = 'none';
+
+        qq.attach(document, 'dragenter', function(e){
+            if (!dz._isValidFileDrag(e)) return;
+
+            dropArea.style.display = 'block';
+        });
+        qq.attach(document, 'dragleave', function(e){
+            if (!dz._isValidFileDrag(e)) return;
+
+            var relatedTarget = document.elementFromPoint(e.clientX, e.clientY);
+            // only fire when leaving document out
+            if ( ! relatedTarget || relatedTarget.nodeName == "HTML"){
+                dropArea.style.display = 'none';
+            }
+        });
+    },
+    _onSubmit: function(id, fileName){
+        qq.FileUploaderBasic.prototype._onSubmit.apply(this, arguments);
+        this._addToList(id, fileName);
+    },
+    _onProgress: function(id, fileName, loaded, total){
+        qq.FileUploaderBasic.prototype._onProgress.apply(this, arguments);
+
+        var item = this._getItemByFileId(id);
+        var size = this._find(item, 'size');
+        size.style.display = 'inline';
+
+        var text;
+        if (loaded != total){
+            text = Math.round(loaded / total * 100) + '% from ' + this._formatSize(total);
+        } else {
+            text = this._formatSize(total);
+        }
+
+        qq.setText(size, text);
+    },
+    _onComplete: function(id, fileName, result){
+        qq.FileUploaderBasic.prototype._onComplete.apply(this, arguments);
+
+        // mark completed
+        var item = this._getItemByFileId(id);
+        qq.remove(this._find(item, 'cancel'));
+        qq.remove(this._find(item, 'spinner'));
+
+        if (result.success){
+            qq.addClass(item, this._classes.success);
+        } else {
+            qq.addClass(item, this._classes.fail);
+        }
+    },
+    _addToList: function(id, fileName){
+        var item = qq.toElement(this._options.fileTemplate);
+        item.qqFileId = id;
+
+        var fileElement = this._find(item, 'file');
+        qq.setText(fileElement, this._formatFileName(fileName));
+        this._find(item, 'size').style.display = 'none';
+
+        this._listElement.appendChild(item);
+    },
+    _getItemByFileId: function(id){
+        var item = this._listElement.firstChild;
+
+        // there can't be txt nodes in dynamically created list
+        // and we can  use nextSibling
+        while (item){
+            if (item.qqFileId == id) return item;
+            item = item.nextSibling;
+        }
+    },
+    /**
+     * delegate click event for cancel link
+     **/
+    _bindCancelEvent: function(){
+        var self = this,
+            list = this._listElement;
+
+        qq.attach(list, 'click', function(e){
+            e = e || window.event;
+            var target = e.target || e.srcElement;
+
+            if (qq.hasClass(target, self._classes.cancel)){
+                qq.preventDefault(e);
+
+                var item = target.parentNode;
+                self._handler.cancel(item.qqFileId);
+                qq.remove(item);
+            }
+        });
+    }
+});
+
+qq.UploadDropZone = function(o){
+    this._options = {
+        element: null,
+        onEnter: function(e){},
+        onLeave: function(e){},
+        // is not fired when leaving element by hovering descendants
+        onLeaveNotDescendants: function(e){},
+        onDrop: function(e){}
+    };
+    qq.extend(this._options, o);
+
+    this._element = this._options.element;
+
+    this._disableDropOutside();
+    this._attachEvents();
+};
+
+qq.UploadDropZone.prototype = {
+    _disableDropOutside: function(e){
+        // run only once for all instances
+        if (!qq.UploadDropZone.dropOutsideDisabled ){
+
+            qq.attach(document, 'dragover', function(e){
+                if (e.dataTransfer){
+                    e.dataTransfer.dropEffect = 'none';
+                    e.preventDefault();
+                }
+            });
+
+            qq.UploadDropZone.dropOutsideDisabled = true;
+        }
+    },
+    _attachEvents: function(){
+        var self = this;
+
+        qq.attach(self._element, 'dragover', function(e){
+            if (!self._isValidFileDrag(e)) return;
+
+            var effect = e.dataTransfer.effectAllowed;
+            if (effect == 'move' || effect == 'linkMove'){
+                e.dataTransfer.dropEffect = 'move'; // for FF (only move allowed)
+            } else {
+                e.dataTransfer.dropEffect = 'copy'; // for Chrome
+            }
+
+            e.stopPropagation();
+            e.preventDefault();
+        });
+
+        qq.attach(self._element, 'dragenter', function(e){
+            if (!self._isValidFileDrag(e)) return;
+
+            self._options.onEnter(e);
+        });
+
+        qq.attach(self._element, 'dragleave', function(e){
+            if (!self._isValidFileDrag(e)) return;
+
+            self._options.onLeave(e);
+
+            var relatedTarget = document.elementFromPoint(e.clientX, e.clientY);
+            // do not fire when moving a mouse over a descendant
+            if (qq.contains(this, relatedTarget)) return;
+
+            self._options.onLeaveNotDescendants(e);
+        });
+
+        qq.attach(self._element, 'drop', function(e){
+            if (!self._isValidFileDrag(e)) return;
+
+            e.preventDefault();
+            self._options.onDrop(e);
+        });
+    },
+    _isValidFileDrag: function(e){
+        var dt = e.dataTransfer,
+            // do not check dt.types.contains in webkit, because it crashes safari 4
+            isWebkit = navigator.userAgent.indexOf("AppleWebKit") > -1;
+
+        // dt.effectAllowed is none in Safari 5
+        // dt.types.contains check is for firefox
+        return dt && dt.effectAllowed != 'none' &&
+            (dt.files || (!isWebkit && dt.types.contains && dt.types.contains('Files')));
+
+    }
+};
+
+qq.UploadButton = function(o){
+    this._options = {
+        element: null,
+        // if set to true adds multiple attribute to file input
+        multiple: false,
+        // name attribute of file input
+        name: 'file',
+        onChange: function(input){},
+        hoverClass: 'qq-upload-button-hover',
+        focusClass: 'qq-upload-button-focus'
+    };
+
+    qq.extend(this._options, o);
+
+    this._element = this._options.element;
+
+    // make button suitable container for input
+    qq.css(this._element, {
+        position: 'relative',
+        overflow: 'hidden',
+        // Make sure browse button is in the right side
+        // in Internet Explorer
+        direction: 'ltr'
+    });
+
+    this._input = this._createInput();
+};
+
+qq.UploadButton.prototype = {
+    /* returns file input element */
+    getInput: function(){
+        return this._input;
+    },
+    /* cleans/recreates the file input */
+    reset: function(){
+        if (this._input.parentNode){
+            qq.remove(this._input);
+        }
+
+        qq.removeClass(this._element, this._options.focusClass);
+        this._input = this._createInput();
+    },
+    _createInput: function(){
+        var input = document.createElement("input");
+
+        if (this._options.multiple){
+            input.setAttribute("multiple", "multiple");
+        }
+
+        input.setAttribute("type", "file");
+        input.setAttribute("name", this._options.name);
+
+        qq.css(input, {
+            position: 'absolute',
+            // in Opera only 'browse' button
+            // is clickable and it is located at
+            // the right side of the input
+            right: 0,
+            top: 0,
+            fontFamily: 'Arial',
+            // 4 persons reported this, the max values that worked for them were 243, 236, 236, 118
+            fontSize: '118px',
+            margin: 0,
+            padding: 0,
+            cursor: 'pointer',
+            opacity: 0
+        });
+
+        this._element.appendChild(input);
+
+        var self = this;
+        qq.attach(input, 'change', function(){
+            self._options.onChange(input);
+        });
+
+        qq.attach(input, 'mouseover', function(){
+            qq.addClass(self._element, self._options.hoverClass);
+        });
+        qq.attach(input, 'mouseout', function(){
+            qq.removeClass(self._element, self._options.hoverClass);
+        });
+        qq.attach(input, 'focus', function(){
+            qq.addClass(self._element, self._options.focusClass);
+        });
+        qq.attach(input, 'blur', function(){
+            qq.removeClass(self._element, self._options.focusClass);
+        });
+
+        // IE and Opera, unfortunately have 2 tab stops on file input
+        // which is unacceptable in our case, disable keyboard access
+        if (window.attachEvent){
+            // it is IE or Opera
+            input.setAttribute('tabIndex', "-1");
+        }
+
+        return input;
+    }
+};
+
+/**
+ * Class for uploading files, uploading itself is handled by child classes
+ */
+qq.UploadHandlerAbstract = function(o){
+    this._options = {
+        debug: false,
+        action: '/upload.php',
+        // maximum number of concurrent uploads
+        maxConnections: 999,
+        onProgress: function(id, fileName, loaded, total){},
+        onComplete: function(id, fileName, response){},
+        onCancel: function(id, fileName){}
+    };
+    qq.extend(this._options, o);
+
+    this._queue = [];
+    // params for files in queue
+    this._params = [];
+};
+qq.UploadHandlerAbstract.prototype = {
+    log: function(str){
+        if (this._options.debug && window.console) console.log('[uploader] ' + str);
+    },
+    /**
+     * Adds file or file input to the queue
+     * @returns id
+     **/
+    add: function(file){},
+    /**
+     * Sends the file identified by id and additional query params to the server
+     */
+    upload: function(id, params){
+        var len = this._queue.push(id);
+
+        var copy = {};
+        qq.extend(copy, params);
+        this._params[id] = copy;
+
+        // if too many active uploads, wait...
+        if (len <= this._options.maxConnections){
+            this._upload(id, this._params[id]);
+        }
+    },
+    /**
+     * Cancels file upload by id
+     */
+    cancel: function(id){
+        this._cancel(id);
+        this._dequeue(id);
+    },
+    /**
+     * Cancells all uploads
+     */
+    cancelAll: function(){
+        for (var i=0; i<this._queue.length; i++){
+            this._cancel(this._queue[i]);
+        }
+        this._queue = [];
+    },
+    /**
+     * Returns name of the file identified by id
+     */
+    getName: function(id){},
+    /**
+     * Returns size of the file identified by id
+     */
+    getSize: function(id){},
+    /**
+     * Returns id of files being uploaded or
+     * waiting for their turn
+     */
+    getQueue: function(){
+        return this._queue;
+    },
+    /**
+     * Actual upload method
+     */
+    _upload: function(id){},
+    /**
+     * Actual cancel method
+     */
+    _cancel: function(id){},
+    /**
+     * Removes element from queue, starts upload of next
+     */
+    _dequeue: function(id){
+        var i = qq.indexOf(this._queue, id);
+        this._queue.splice(i, 1);
+
+        var max = this._options.maxConnections;
+
+        if (this._queue.length >= max && i < max){
+            var nextId = this._queue[max-1];
+            this._upload(nextId, this._params[nextId]);
+        }
+    }
+};
+
+/**
+ * Class for uploading files using form and iframe
+ * @inherits qq.UploadHandlerAbstract
+ */
+qq.UploadHandlerForm = function(o){
+    qq.UploadHandlerAbstract.apply(this, arguments);
+
+    this._inputs = {};
+};
+// @inherits qq.UploadHandlerAbstract
+qq.extend(qq.UploadHandlerForm.prototype, qq.UploadHandlerAbstract.prototype);
+
+qq.extend(qq.UploadHandlerForm.prototype, {
+    add: function(fileInput){
+        fileInput.setAttribute('name', 'qqfile');
+        var id = 'qq-upload-handler-iframe' + qq.getUniqueId();
+
+        this._inputs[id] = fileInput;
+
+        // remove file input from DOM
+        if (fileInput.parentNode){
+            qq.remove(fileInput);
+        }
+
+        return id;
+    },
+    getName: function(id){
+        // get input value and remove path to normalize
+        return this._inputs[id].value.replace(/.*(\/|\\)/, "");
+    },
+    _cancel: function(id){
+        this._options.onCancel(id, this.getName(id));
+
+        delete this._inputs[id];
+
+        var iframe = document.getElementById(id);
+        if (iframe){
+            // to cancel request set src to something else
+            // we use src="javascript:false;" because it doesn't
+            // trigger ie6 prompt on https
+            iframe.setAttribute('src', 'javascript:false;');
+
+            qq.remove(iframe);
+        }
+    },
+    _upload: function(id, params){
+        var input = this._inputs[id];
+
+        if (!input){
+            throw new Error('file with passed id was not added, or already uploaded or cancelled');
+        }
+
+        var fileName = this.getName(id);
+
+        var iframe = this._createIframe(id);
+        var form = this._createForm(iframe, params);
+        form.appendChild(input);
+
+        var self = this;
+        this._attachLoadEvent(iframe, function(){
+            self.log('iframe loaded');
+
+            var response = self._getIframeContentJSON(iframe);
+
+            self._options.onComplete(id, fileName, response);
+            self._dequeue(id);
+
+            delete self._inputs[id];
+            // timeout added to fix busy state in FF3.6
+            setTimeout(function(){
+                qq.remove(iframe);
+            }, 1);
+        });
+
+        form.submit();
+        qq.remove(form);
+
+        return id;
+    },
+    _attachLoadEvent: function(iframe, callback){
+        qq.attach(iframe, 'load', function(){
+            // when we remove iframe from dom
+            // the request stops, but in IE load
+            // event fires
+            if (!iframe.parentNode){
+                return;
+            }
+
+            // fixing Opera 10.53
+            if (iframe.contentDocument &&
+                iframe.contentDocument.body &&
+                iframe.contentDocument.body.innerHTML == "false"){
+                // In Opera event is fired second time
+                // when body.innerHTML changed from false
+                // to server response approx. after 1 sec
+                // when we upload file with iframe
+                return;
+            }
+
+            callback();
+        });
+    },
+    /**
+     * Returns json object received by iframe from server.
+     */
+    _getIframeContentJSON: function(iframe){
+        // iframe.contentWindow.document - for IE<7
+        var doc = iframe.contentDocument ? iframe.contentDocument: iframe.contentWindow.document,
+            response;
+
+        this.log("converting iframe's innerHTML to JSON");
+        this.log("innerHTML = " + doc.body.innerHTML);
+
+        try {
+            response = eval("(" + doc.body.innerHTML + ")");
+        } catch(err){
+            response = {};
+        }
+
+        return response;
+    },
+    /**
+     * Creates iframe with unique name
+     */
+    _createIframe: function(id){
+        // We can't use following code as the name attribute
+        // won't be properly registered in IE6, and new window
+        // on form submit will open
+        // var iframe = document.createElement('iframe');
+        // iframe.setAttribute('name', id);
+
+        var iframe = qq.toElement('<iframe src="javascript:false;" name="' + id + '" />');
+        // src="javascript:false;" removes ie6 prompt on https
+
+        iframe.setAttribute('id', id);
+
+        iframe.style.display = 'none';
+        document.body.appendChild(iframe);
+
+        return iframe;
+    },
+    /**
+     * Creates form, that will be submitted to iframe
+     */
+    _createForm: function(iframe, params){
+        // We can't use the following code in IE6
+        // var form = document.createElement('form');
+        // form.setAttribute('method', 'post');
+        // form.setAttribute('enctype', 'multipart/form-data');
+        // Because in this case file won't be attached to request
+        var form = qq.toElement('<form method="post" enctype="multipart/form-data"></form>');
+
+        var queryString = qq.obj2url(params, this._options.action);
+
+        form.setAttribute('action', queryString);
+        form.setAttribute('target', iframe.name);
+        form.style.display = 'none';
+        document.body.appendChild(form);
+
+        return form;
+    }
+});
+
+/**
+ * Class for uploading files using xhr
+ * @inherits qq.UploadHandlerAbstract
+ */
+qq.UploadHandlerXhr = function(o){
+    qq.UploadHandlerAbstract.apply(this, arguments);
+
+    this._files = [];
+    this._xhrs = [];
+
+    // current loaded size in bytes for each file
+    this._loaded = [];
+};
+
+// static method
+qq.UploadHandlerXhr.isSupported = function(){
+    var input = document.createElement('input');
+    input.type = 'file';
+
+    return (
+        'multiple' in input &&
+        typeof File != "undefined" &&
+        typeof (new XMLHttpRequest()).upload != "undefined" );
+};
+
+// @inherits qq.UploadHandlerAbstract
+qq.extend(qq.UploadHandlerXhr.prototype, qq.UploadHandlerAbstract.prototype)
+
+qq.extend(qq.UploadHandlerXhr.prototype, {
+    /**
+     * Adds file to the queue
+     * Returns id to use with upload, cancel
+     **/
+    add: function(file){
+        if (!(file instanceof File)){
+            throw new Error('Passed obj in not a File (in qq.UploadHandlerXhr)');
+        }
+
+        return this._files.push(file) - 1;
+    },
+    getName: function(id){
+        var file = this._files[id];
+        // fix missing name in Safari 4
+        return file.fileName != null ? file.fileName : file.name;
+    },
+    getSize: function(id){
+        var file = this._files[id];
+        return file.fileSize != null ? file.fileSize : file.size;
+    },
+    /**
+     * Returns uploaded bytes for file identified by id
+     */
+    getLoaded: function(id){
+        return this._loaded[id] || 0;
+    },
+    /**
+     * Sends the file identified by id and additional query params to the server
+     * @param {Object} params name-value string pairs
+     */
+    _upload: function(id, params){
+        var file = this._files[id],
+            name = this.getName(id),
+            size = this.getSize(id);
+
+        this._loaded[id] = 0;
+
+        var xhr = this._xhrs[id] = new XMLHttpRequest();
+        var self = this;
+
+        xhr.upload.onprogress = function(e){
+            if (e.lengthComputable){
+                self._loaded[id] = e.loaded;
+                self._options.onProgress(id, name, e.loaded, e.total);
+            }
+        };
+
+        xhr.onreadystatechange = function(){
+            if (xhr.readyState == 4){
+                self._onComplete(id, xhr);
+            }
+        };
+
+        // build query string
+        params = params || {};
+        params['qqfile'] = name;
+        var queryString = qq.obj2url(params, this._options.action);
+
+        xhr.open("POST", queryString, true);
+        xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
+        xhr.setRequestHeader("X-File-Name", encodeURIComponent(name));
+        xhr.setRequestHeader("Content-Type", "application/octet-stream");
+        xhr.send(file);
+    },
+    _onComplete: function(id, xhr){
+        // the request was aborted/cancelled
+        if (!this._files[id]) return;
+
+        var name = this.getName(id);
+        var size = this.getSize(id);
+
+        this._options.onProgress(id, name, size, size);
+
+        if (xhr.status == 200){
+            this.log("xhr - server response received");
+            this.log("responseText = " + xhr.responseText);
+
+            var response;
+
+            try {
+                response = eval("(" + xhr.responseText + ")");
+            } catch(err){
+                response = {};
+            }
+
+            this._options.onComplete(id, name, response);
+
+        } else {
+            this._options.onComplete(id, name, {});
+        }
+
+        this._files[id] = null;
+        this._xhrs[id] = null;
+        this._dequeue(id);
+    },
+    _cancel: function(id){
+        this._options.onCancel(id, this.getName(id));
+
+        this._files[id] = null;
+
+        if (this._xhrs[id]){
+            this._xhrs[id].abort();
+            this._xhrs[id] = null;
+        }
+    }
+});
\ No newline at end of file