#

API Docs for: 3.10.3
Show: Inherited Protected Private Deprecated

# File: uploader/js/uploader-flash.js

    /**
    * This module provides a UI for file selection and multiple file upload capability using
    * Flash as a transport engine.
    * The supported features include: automatic upload queue management, upload progress
    * tracking, file filtering, server response retrieval and error reporting.
    *
    * @module uploader-flash
    */

    // Shorthands for external modules
    var substitute            = Y.Lang.sub,
        UploaderQueue         = Y.Uploader.Queue;

    /**
    * This module provides a UI for file selection and multiple file upload capability
    * using Flash as a transport engine.
    * @class UploaderFlash
    * @extends Widget
    * @param {Object} config Configuration object.
    * @constructor
    */

    function UploaderFlash() {
        UploaderFlash.superclass.constructor.apply ( this, arguments );
    }

    Y.UploaderFlash = Y.extend(UploaderFlash, Y.Widget, {

        /**
        * Stored value of the current button state (based on
        * mouse events dispatched by the Flash player)
        * @property _buttonState
        * @type {String}
        * @protected
        */
        _buttonState: "up",

        /**
        * Stored value of the current button focus state (based
        * on keyboard and mouse events).
        * @property _buttonFocus
        * @type {Boolean}
        * @protected
        */
        _buttonFocus: false,

        /**
        * Stored value of the unique id for the container that holds the
        * Flash uploader.
        *
        * @property _swfContainerId
        * @type {String}
        * @protected
        */
        _swfContainerId: null,

        /**
        * Stored reference to the instance of SWF used to host the
        * Flash uploader.
        *
        * @property _swfReference
        * @type {SWF}
        * @protected
        */
        _swfReference: null,

        /**
        * Stored reference to the instance of Uploader.Queue used to manage
        * the upload process. This is a read-only property that only exists
        * during an active upload process. Only one queue can be active at
        * a time; if an upload start is attempted while a queue is active,
        * it will be ignored.
        *
        * @property queue
        * @type {Y.Uploader.Queue}
        */
        queue: null,

        /**
        * Stored event bindings for keyboard navigation to and from the uploader.
        *
        * @property _tabElementBindings
        * @type {Object}
        * @protected
        */
        _tabElementBindings: null,

        /**
        * Construction logic executed during UploaderFlash instantiation.
        *
        * @method initializer
        * @protected
        */
        initializer : function () {

            // Assign protected variable values
            this._swfContainerId = Y.guid("uploader");
            this._swfReference = null;
            this.queue = null;
            this._buttonState = "up";
            this._buttonFocus = null;
            this._tabElementBindings = null;
            this._fileList = [];

            // Publish available events

            /**
            * Signals that files have been selected.
            *
            * @event fileselect
            * @param event {Event} The event object for the `fileselect` with the
            *                      following payload:
            *  <dl>
            *      <dt>fileList</dt>
            *          <dd>An `Array` of files selected by the user, encapsulated
            *              in Y.FileFlash objects.</dd>
            *  </dl>
            */
            this.publish("fileselect");

            /**
            * Signals that an upload of multiple files has been started.
            *
            * @event uploadstart
            * @param event {Event} The event object for the `uploadstart`.
            */
            this.publish("uploadstart");

            /**
            * Signals that an upload of a specific file has started.
            *
            * @event fileuploadstart
            * @param event {Event} The event object for the `fileuploadstart` with the
            *                      following payload:
            *  <dl>
            *      <dt>file</dt>
            *          <dd>A reference to the Y.File that dispatched the event.</dd>
            *      <dt>originEvent</dt>
            *          <dd>The original event dispatched by Y.File.</dd>
            *  </dl>
            */
            this.publish("fileuploadstart");

            /**
            * Reports on upload progress of a specific file.
            *
            * @event uploadprogress
            * @param event {Event} The event object for the `uploadprogress` with the
            *                      following payload:
            *  <dl>
            *      <dt>bytesLoaded</dt>
            *          <dd>The number of bytes of the file that has been uploaded</dd>
            *      <dt>bytesTotal</dt>
            *          <dd>The total number of bytes in the file</dd>
            *      <dt>percentLoaded</dt>
            *          <dd>The fraction of the file that has been uploaded, out of 100</dd>
            *      <dt>originEvent</dt>
            *          <dd>The original event dispatched by the SWF uploader</dd>
            *  </dl>
            */
            this.publish("uploadprogress");

            /**
            * Reports on the total upload progress of the file list.
            *
            * @event totaluploadprogress
            * @param event {Event} The event object for the `totaluploadprogress` with the
            *                      following payload:
            *  <dl>
            *      <dt>bytesLoaded</dt>
            *          <dd>The number of bytes of the file list that has been uploaded</dd>
            *      <dt>bytesTotal</dt>
            *          <dd>The total number of bytes in the file list</dd>
            *      <dt>percentLoaded</dt>
            *          <dd>The fraction of the file list that has been uploaded, out of 100</dd>
            *  </dl>
            */
            this.publish("totaluploadprogress");

            /**
            * Signals that a single file upload has been completed.
            *
            * @event uploadcomplete
            * @param event {Event} The event object for the `uploadcomplete` with the
            *                      following payload:
            *  <dl>
            *      <dt>file</dt>
            *          <dd>The pointer to the instance of `Y.File` whose upload has been completed.</dd>
            *      <dt>originEvent</dt>
            *          <dd>The original event fired by the SWF Uploader</dd>
            *      <dt>data</dt>
            *          <dd>Data returned by the server.</dd>
            *  </dl>
            */
            this.publish("uploadcomplete");

            /**
            * Signals that the upload process of the entire file list has been completed.
            *
            * @event alluploadscomplete
            * @param event {Event} The event object for the `alluploadscomplete`.
            */
            this.publish("alluploadscomplete");

            /**
            * Signals that a error has occurred in a specific file's upload process.
            *
            * @event uploaderror
            * @param event {Event} The event object for the `uploaderror` with the
            *                      following payload:
            *  <dl>
            *      <dt>originEvent</dt>
            *          <dd>The original error event fired by the SWF Uploader. </dd>
            *      <dt>file</dt>
            *          <dd>The pointer at the instance of Y.FileFlash that returned the error.</dd>
            *      <dt>source</dt>
            *          <dd>The source of the upload error, either "io" or "http"</dd>
            *      <dt>message</dt>
            *          <dd>The message that accompanied the error. Corresponds to the text of
            *              the error in cases where source is "io", and to the HTTP status for
                                         cases where source is "http".</dd>
            *  </dl>
            */
            this.publish("uploaderror");

            /**
            * Signals that a mouse has begun hovering over the `Select Files` button.
            *
            * @event mouseenter
            * @param event {Event} The event object for the `mouseenter` event.
            */
            this.publish("mouseenter");

            /**
            * Signals that a mouse has stopped hovering over the `Select Files` button.
            *
            * @event mouseleave
            * @param event {Event} The event object for the `mouseleave` event.
            */
            this.publish("mouseleave");

            /**
            * Signals that a mouse button has been pressed over the `Select Files` button.
            *
            * @event mousedown
            * @param event {Event} The event object for the `mousedown` event.
            */
            this.publish("mousedown");

            /**
            * Signals that a mouse button has been released over the `Select Files` button.
            *
            * @event mouseup
            * @param event {Event} The event object for the `mouseup` event.
            */
            this.publish("mouseup");

            /**
            * Signals that a mouse has been clicked over the `Select Files` button.
            *
            * @event click
            * @param event {Event} The event object for the `click` event.
            */
            this.publish("click");
        },

        /**
        * Creates the DOM structure for the UploaderFlash.
        * UploaderFlash's DOM structure consists of two layers: the base "Select Files"
        * button that can be replaced by the developer's widget of choice; and a transparent
        * Flash overlay positoned above the button that captures all input events.
        * The `position` style attribute of the `boundingBox` of the `Uploader` widget
        * is forced to be `relative`, in order to accommodate the Flash player overlay
        * (which is `position`ed `absolute`ly).
        *
        * @method renderUI
        * @protected
        */
        renderUI : function () {
            var boundingBox = this.get("boundingBox"),
                contentBox = this.get('contentBox'),
                selFilesButton = this.get("selectFilesButton"),
                flashContainer = Y.Node.create(substitute(UploaderFlash.FLASH_CONTAINER, {
                    swfContainerId: this._swfContainerId
                })),
                params = {
                    version: "10.0.45",
                    fixedAttributes: {
                        wmode: "transparent",
                        allowScriptAccess:"always",
                        allowNetworking:"all",
                        scale: "noscale"
                    }
                };

            boundingBox.setStyle("position", "relative");
            selFilesButton.setStyles({width: "100%", height: "100%"});
            contentBox.append(selFilesButton);
            contentBox.append(flashContainer);

            this._swfReference = new Y.SWF(flashContainer, this.get("swfURL"), params);
        },

        /**
        * Binds handlers to the UploaderFlash UI events and propagates attribute
        * values to the Flash player.
        * The propagation of initial values is set to occur once the Flash player
        * instance is ready (as indicated by the `swfReady` event.)
        *
        * @method bindUI
        * @protected
        */
        bindUI : function () {

            this._swfReference.on("swfReady", function () {
                this._setMultipleFiles();
                this._setFileFilters();
                this._triggerEnabled();
                this._attachTabElements();
                this.after("multipleFilesChange", this._setMultipleFiles, this);
                this.after("fileFiltersChange", this._setFileFilters, this);
                this.after("enabledChange", this._triggerEnabled, this);
                this.after("tabElementsChange", this._attachTabElements);
            }, this);

            this._swfReference.on("fileselect", this._updateFileList, this);

            // this._swfReference.on("trace", function (ev) {console.log(ev.message);});

            this._swfReference.on("mouseenter", function () {
                this.fire("mouseenter");
                this._setButtonClass("hover", true);
                if (this._buttonState === "down") {
                    this._setButtonClass("active", true);
                }
            }, this);

            this._swfReference.on("mouseleave", function () {
                this.fire("mouseleave");
                this._setButtonClass("hover", false);
                this._setButtonClass("active", false);
            }, this);

            this._swfReference.on("mousedown", function () {
                this.fire("mousedown");
                this._buttonState = "down";
                this._setButtonClass("active", true);
            }, this);

            this._swfReference.on("mouseup", function () {
                this.fire("mouseup");
                this._buttonState = "up";
                this._setButtonClass("active", false);
            }, this);

            this._swfReference.on("click", function () {
                this.fire("click");
                this._buttonFocus = true;
                this._setButtonClass("focus", true);
                Y.one("body").focus();
                this._swfReference._swf.focus();
            }, this);
        },

        /**
        * Attaches keyboard bindings to enabling tabbing to and from the instance of the Flash
        * player in the Uploader widget. If the previous and next elements are specified, the
        * keyboard bindings enable the user to tab from the `tabElements["from"]` node to the
        * Flash-powered "Select Files" button, and to the `tabElements["to"]` node.
        *
        * @method _attachTabElements
        * @protected
        * @param ev {Event} Optional event payload if called as a `tabElementsChange` handler.
        */
        _attachTabElements : function () {
            if (this.get("tabElements") !== null && this.get("tabElements").from !== null && this.get("tabElements").to !== null) {

                if (this._tabElementBindings !== null) {
                    this._tabElementBindings.from.detach();
                    this._tabElementBindings.to.detach();
                    this._tabElementBindings.tabback.detach();
                    this._tabElementBindings.tabforward.detach();
                    this._tabElementBindings.focus.detach();
                    this._tabElementBindings.blur.detach();
                }
                else {
                    this._tabElementBindings = {};
                }

                var fromElement = Y.one(this.get("tabElements").from),
                    toElement = Y.one(this.get("tabElements").to);

                this._tabElementBindings.from = fromElement.on("keydown", function (ev) {
                    if (ev.keyCode === 9 && !ev.shiftKey) {
                        ev.preventDefault();
                        this._swfReference._swf.setAttribute("tabindex", 0);
                        this._swfReference._swf.setAttribute("role", "button");
                        this._swfReference._swf.setAttribute("aria-label", this.get("selectButtonLabel"));
                        this._swfReference._swf.focus();
                    }
                }, this);

                this._tabElementBindings.to = toElement.on("keydown", function (ev) {
                    if (ev.keyCode === 9 && ev.shiftKey) {
                        ev.preventDefault();
                        this._swfReference._swf.setAttribute("tabindex", 0);
                        this._swfReference._swf.setAttribute("role", "button");
                        this._swfReference._swf.setAttribute("aria-label", this.get("selectButtonLabel"));
                        this._swfReference._swf.focus();
                    }
                }, this);

                this._tabElementBindings.tabback = this._swfReference.on("tabback", function () {
                    this._swfReference._swf.blur();
                    setTimeout(function () {
                        fromElement.focus();
                    }, 30);
                }, this);

                this._tabElementBindings.tabforward = this._swfReference.on("tabforward", function () {
                    this._swfReference._swf.blur();
                    setTimeout(function () {
                        toElement.focus();
                    }, 30);
                }, this);

                this._tabElementBindings.focus = this._swfReference._swf.on("focus", function () {
                    this._buttonFocus = true;
                    this._setButtonClass("focus", true);
                }, this);

                this._tabElementBindings.blur = this._swfReference._swf.on("blur", function () {
                    this._buttonFocus = false;
                    this._setButtonClass("focus", false);
                }, this);
            }
            else if (this._tabElementBindings !== null) {
                this._tabElementBindings.from.detach();
                this._tabElementBindings.to.detach();
                this._tabElementBindings.tabback.detach();
                this._tabElementBindings.tabforward.detach();
                this._tabElementBindings.focus.detach();
                this._tabElementBindings.blur.detach();
            }
        },

        /**
        * Adds or removes a specified state CSS class to the underlying uploader button.
        *
        * @method _setButtonClass
        * @protected
        * @param state {String} The name of the state enumerated in `buttonClassNames` attribute
        * from which to derive the needed class name.
        * @param add {Boolean} A Boolean indicating whether to add or remove the class.
        */
        _setButtonClass : function (state, add) {
            if (add) {
                this.get("selectFilesButton").addClass(this.get("buttonClassNames")[state]);
            }
            else {
                this.get("selectFilesButton").removeClass(this.get("buttonClassNames")[state]);
            }
        },

        /**
        * Syncs the state of the `fileFilters` attribute between the instance of UploaderFlash
        * and the Flash player.
        *
        * @method _setFileFilters
        * @private
        */
        _setFileFilters : function () {
            if (this._swfReference && this.get("fileFilters").length > 0) {
                this._swfReference.callSWF("setFileFilters", [this.get("fileFilters")]);
            }
        },

        /**
        * Syncs the state of the `multipleFiles` attribute between this class
        * and the Flash uploader.
        *
        * @method _setMultipleFiles
        * @private
        */
        _setMultipleFiles : function () {
            if (this._swfReference) {
                this._swfReference.callSWF("setAllowMultipleFiles", [this.get("multipleFiles")]);
            }
        },

        /**
        * Syncs the state of the `enabled` attribute between this class
        * and the Flash uploader.
        *
        * @method _triggerEnabled
        * @private
        */
        _triggerEnabled : function () {
            if (this.get("enabled")) {
                this._swfReference.callSWF("enable");
                this._swfReference._swf.setAttribute("aria-disabled", "false");
                this._setButtonClass("disabled", false);
            }
            else {
                this._swfReference.callSWF("disable");
                this._swfReference._swf.setAttribute("aria-disabled", "true");
                this._setButtonClass("disabled", true);
            }
        },

        /**
        * Getter for the `fileList` attribute
        *
        * @method _getFileList
        * @private
        */
        _getFileList : function () {
            return this._fileList.concat();
        },

        /**
        * Setter for the `fileList` attribute
        *
        * @method _setFileList
        * @private
        */
        _setFileList : function (val) {
            this._fileList = val.concat();
            return this._fileList.concat();
        },

        /**
        * Adjusts the content of the `fileList` based on the results of file selection
        * and the `appendNewFiles` attribute. If the `appendNewFiles` attribute is true,
        * then selected files are appended to the existing list; otherwise, the list is
        * cleared and populated with the newly selected files.
        *
        * @method _updateFileList
        * @param ev {Event} The file selection event received from the uploader.
        * @private
        */
        _updateFileList : function (ev) {

            Y.one("body").focus();
            this._swfReference._swf.focus();

            var newfiles = ev.fileList,
                fileConfObjects = [],
                parsedFiles = [],
                swfRef = this._swfReference,
                filterFunc = this.get("fileFilterFunction"),
                oldfiles;

            Y.each(newfiles, function (value) {
                var newFileConf = {};
                newFileConf.id = value.fileId;
                newFileConf.name = value.fileReference.name;
                newFileConf.size = value.fileReference.size;
                newFileConf.type = value.fileReference.type;
                newFileConf.dateCreated = value.fileReference.creationDate;
                newFileConf.dateModified = value.fileReference.modificationDate;
                newFileConf.uploader = swfRef;

                fileConfObjects.push(newFileConf);
            });

             if (filterFunc) {
                Y.each(fileConfObjects, function (value) {
                    var newfile = new Y.FileFlash(value);
                    if (filterFunc(newfile)) {
                        parsedFiles.push(newfile);
                    }
                });
             }
             else {
                Y.each(fileConfObjects, function (value) {
                    parsedFiles.push(new Y.FileFlash(value));
                });
             }

            if (parsedFiles.length > 0) {
                oldfiles = this.get("fileList");

                this.set("fileList",
                                 this.get("appendNewFiles") ? oldfiles.concat(parsedFiles) : parsedFiles );

                this.fire("fileselect", { fileList: parsedFiles });
            }

        },

        /**
        * Handles and retransmits events fired by `Y.FileFlash` and `Y.Uploader.Queue`.
        *
        * @method _uploadEventHandler
        * @param event The event dispatched during the upload process.
        * @private
        */
        _uploadEventHandler : function (event) {

            switch (event.type) {
                case "file:uploadstart":
                     this.fire("fileuploadstart", event);
                    break;
                case "file:uploadprogress":
                     this.fire("uploadprogress", event);
                    break;
                case "uploaderqueue:totaluploadprogress":
                     this.fire("totaluploadprogress", event);
                    break;
                case "file:uploadcomplete":
                     this.fire("uploadcomplete", event);
                    break;
                case "uploaderqueue:alluploadscomplete":
                     this.queue = null;
                     this.fire("alluploadscomplete", event);
                    break;
                case "file:uploaderror": //overflow intentional
                case "uploaderqueue:uploaderror":
                     this.fire("uploaderror", event);
                    break;
                case "file:uploadcancel": // overflow intentional
                case "uploaderqueue:uploadcancel":
                     this.fire("uploadcancel", event);
                break;
            }

        },

        /**
        * Starts the upload of a specific file.
        *
        * @method upload
        * @param file {Y.FileFlash} Reference to the instance of the file to be uploaded.
        * @param url {String} The URL to upload the file to.
        * @param [postVars] {Object} A set of key-value pairs to send as variables along with the file upload HTTP request.
        *                          If not specified, the values from the attribute `postVarsPerFile` are used instead.
        */
        upload : function (file, url, postvars) {

            var uploadURL = url || this.get("uploadURL"),
                postVars = postvars || this.get("postVarsPerFile"),
                fileId = file.get("id");

                postVars = postVars.hasOwnProperty(fileId) ? postVars[fileId] : postVars;

            if (file instanceof Y.FileFlash) {

                file.on("uploadstart", this._uploadEventHandler, this);
                file.on("uploadprogress", this._uploadEventHandler, this);
                file.on("uploadcomplete", this._uploadEventHandler, this);
                file.on("uploaderror", this._uploadEventHandler, this);
                file.on("uploadcancel", this._uploadEventHandler, this);

                file.startUpload(uploadURL, postVars, this.get("fileFieldName"));
            }
        },

        /**
        * Starts the upload of all files on the file list, using an automated queue.
        *
        * @method uploadAll
        * @param url {String} The URL to upload the files to.
        * @param [postVars] {Object} A set of key-value pairs to send as variables along with the file upload HTTP request.
        *                          If not specified, the values from the attribute `postVarsPerFile` are used instead.
        */
        uploadAll : function (url, postvars) {
            this.uploadThese(this.get("fileList"), url, postvars);
        },

        /**
        * Starts the upload of the files specified in the first argument, using an automated queue.
        *
        * @method uploadThese
        * @param files {Array} The list of files to upload.
        * @param url {String} The URL to upload the files to.
        * @param [postVars] {Object} A set of key-value pairs to send as variables along with the file upload HTTP request.
        *                          If not specified, the values from the attribute `postVarsPerFile` are used instead.
        */
        uploadThese : function (files, url, postvars) {
            if (!this.queue) {
                var uploadURL = url || this.get("uploadURL"),
                    postVars = postvars || this.get("postVarsPerFile");

                this.queue = new UploaderQueue({
                    simUploads: this.get("simLimit"),
                    errorAction: this.get("errorAction"),
                    fileFieldName: this.get("fileFieldName"),
                    fileList: files,
                    uploadURL: uploadURL,
                    perFileParameters: postVars,
                    retryCount: this.get("retryCount")
                });

                this.queue.on("uploadstart", this._uploadEventHandler, this);
                this.queue.on("uploadprogress", this._uploadEventHandler, this);
                this.queue.on("totaluploadprogress", this._uploadEventHandler, this);
                this.queue.on("uploadcomplete", this._uploadEventHandler, this);
                this.queue.on("alluploadscomplete", this._uploadEventHandler, this);
                this.queue.on("alluploadscancelled", function () {this.queue = null;}, this);
                this.queue.on("uploaderror", this._uploadEventHandler, this);
                this.queue.startUpload();

                this.fire("uploadstart");
            }
        }
    },

    {
        /**
        * The template for the Flash player container. Since the Flash player container needs
        * to completely overlay the &lquot;Select Files&rqot; control, it's positioned absolutely,
        * with width and height set to 100% of the parent.
        *
        * @property FLASH_CONTAINER
        * @type {HTML}
        * @static
        * @default '<div id="{swfContainerId}" style="position:absolute; top:0px; left: 0px; margin: 0; padding: 0;
        *           border: 0; width:100%; height:100%"></div>'
        */
        FLASH_CONTAINER: '<div id="{swfContainerId}" style="position:absolute; top:0px; left: 0px; margin: 0; ' +
                         'padding: 0; border: 0; width:100%; height:100%"></div>',

        /**
        * The template for the "Select Files" button.
        *
        * @property SELECT_FILES_BUTTON
        * @type {HTML}
        * @static
        * @default "<button type='button' class='yui3-button' tabindex='-1'>{selectButtonLabel}</button>"
        */
        SELECT_FILES_BUTTON: "<button type='button' class='yui3-button' tabindex='-1'>{selectButtonLabel}</button>",

        /**
        * The static property reflecting the type of uploader that `Y.Uploader`
        * aliases. The UploaderFlash value is `"flash"`.
        *
        * @property TYPE
        * @type {String}
        * @static
        */
        TYPE: "flash",

        /**
        * The identity of the widget.
        *
        * @property NAME
        * @type String
        * @default 'uploader'
        * @readOnly
        * @protected
        * @static
        */
        NAME: "uploader",

        /**
        * Static property used to define the default attribute configuration of
        * the Widget.
        *
        * @property ATTRS
        * @type {Object}
        * @protected
        * @static
        */
        ATTRS: {

            /**
            * A Boolean indicating whether newly selected files should be appended
            * to the existing file list, or whether they should replace it.
            *
            * @attribute appendNewFiles
            * @type {Boolean}
            * @default true
            */
            appendNewFiles : {
                value: true
            },

            /**
            * The names of CSS classes that correspond to different button states
            * of the "Select Files" control. These classes are assigned to the
            * "Select Files" control based on the mouse states reported by the
            * Flash player. The keys for the class names are:
            * <ul>
            *   <li> <strong>`hover`</strong>: the class corresponding to mouse hovering over
            *      the "Select Files" button.</li>
            *   <li> <strong>`active`</strong>: the class corresponding to mouse down state of
            *      the "Select Files" button.</li>
            *   <li> <strong>`disabled`</strong>: the class corresponding to the disabled state
            *      of the "Select Files" button.</li>
            *   <li> <strong>`focus`</strong>: the class corresponding to the focused state of
            *      the "Select Files" button.</li>
            * </ul>
            * @attribute buttonClassNames
            * @type {Object}
            * @default { hover: "yui3-button-hover",
            *            active: "yui3-button-active",
            *            disabled: "yui3-button-disabled",
            *            focus: "yui3-button-selected"
            *          }
            */
            buttonClassNames: {
                value: {
                    "hover": "yui3-button-hover",
                    "active": "yui3-button-active",
                    "disabled": "yui3-button-disabled",
                    "focus": "yui3-button-selected"
                }
            },

            /**
            * A Boolean indicating whether the uploader is enabled or disabled for user input.
            *
            * @attribute enabled
            * @type {Boolean}
            * @default true
            */
            enabled : {
                value: true
            },

            /**
            * The action  performed when an upload error occurs for a specific file being uploaded.
            * The possible values are:
            * <ul>
            *   <li> <strong>`UploaderQueue.CONTINUE`</strong>: the error is ignored and the upload process is continued.</li>
            *   <li> <strong>`UploaderQueue.STOP`</strong>: the upload process is stopped as soon as any other parallel file
            *     uploads are finished.</li>
            *   <li> <strong>`UploaderQueue.RESTART_ASAP`</strong>: the file is added back to the front of the queue.</li>
            *   <li> <strong>`UploaderQueue.RESTART_AFTER`</strong>: the file is added to the back of the queue.</li>
            * </ul>
            * @attribute errorAction
            * @type {String}
            * @default UploaderQueue.CONTINUE
            */
            errorAction: {
                value: "continue",
                validator: function (val) {
                    return (
                        val === UploaderQueue.CONTINUE ||
                        val === UploaderQueue.STOP ||
                        val === UploaderQueue.RESTART_ASAP ||
                        val === UploaderQueue.RESTART_AFTER
                    );
                }
            },

            /**
            * An array indicating what fileFilters should be applied to the file
            * selection dialog. Each element in the array should be an object with
            * the following key-value pairs:
            * {
            *   description : String
             extensions: String of the form &lquot;*.ext1;*.ext2;*.ext3;...&rquot;
            * }
            * @attribute fileFilters
            * @type {Array}
            * @default []
            */
            fileFilters: {
                value: []
            },

            /**
            * A filtering function that is applied to every file selected by the user.
            * The function receives the `Y.File` object and must return a Boolean value.
            * If a `false` value is returned, the file in question is not added to the
            * list of files to be uploaded.
            * Use this function to put limits on file sizes or check the file names for
            * correct extension, but make sure that a server-side check is also performed,
            * since any client-side restrictions are only advisory and can be circumvented.
            *
            * @attribute fileFilterFunction
            * @type {Function}
            * @default null
            */
            fileFilterFunction: {
                value: null
            },

            /**
            * A String specifying what should be the POST field name for the file
            * content in the upload request.
            *
            * @attribute fileFieldName
            * @type {String}
            * @default Filedata
            */
            fileFieldName: {
                value: "Filedata"
            },

            /**
            * The array of files to be uploaded. All elements in the array
            * must be instances of `Y.FileFlash` and be instantiated with a `fileId`
            * retrieved from an instance of the uploader.
            *
            * @attribute fileList
            * @type {Array}
            * @default []
            */
            fileList: {
                value: [],
                getter: "_getFileList",
                setter: "_setFileList"
            },

            /**
            * A Boolean indicating whether multiple file selection is enabled.
            *
            * @attribute multipleFiles
            * @type {Boolean}
            * @default false
            */
            multipleFiles: {
                value: false
            },

            /**
            * An object, keyed by `fileId`, containing sets of key-value pairs
            * that should be passed as POST variables along with each corresponding
            * file. This attribute is only used if no POST variables are specifed
            * in the upload method call.
            *
            * @attribute postVarsPerFile
            * @type {Object}
            * @default {}
            */
            postVarsPerFile: {
                value: {}
            },

            /**
            * The label for the "Select Files" widget. This is the value that replaces the
            * `{selectButtonLabel}` token in the `SELECT_FILES_BUTTON` template.
            *
            * @attribute selectButtonLabel
            * @type {String}
            * @default "Select Files"
            */
            selectButtonLabel: {
                value: "Select Files"
            },

            /**
            * The widget that serves as the "Select Files" control for the file uploader
            *
            *
            * @attribute selectFilesButton
            * @type {Node | Widget}
            * @default A standard HTML button with YUI CSS Button skin.
            */
            selectFilesButton : {
                valueFn: function () {
                    return Y.Node.create(substitute(Y.UploaderFlash.SELECT_FILES_BUTTON, {selectButtonLabel: this.get("selectButtonLabel")}));
                 }
            },

            /**
            * The number of files that can be uploaded
            * simultaneously if the automatic queue management
            * is used. This value can be in the range between 2
            * and 5.
            *
            * @attribute simLimit
            * @type {Number}
            * @default 2
            */
            simLimit: {
                value: 2,
                validator: function (val) {
                        return (val >= 2 && val <= 5);
                }
            },

            /**
            * The URL to the SWF file of the flash uploader. A copy local to
            * the server that hosts the page on which the uploader appears is
            * recommended.
            *
            * @attribute swfURL
            * @type {String}
            * @default "CDN Prefix + uploader/assets/flashuploader.swf" with a
            * random GET parameter for IE (to prevent buggy behavior when the SWF
            * is cached).
            */
            swfURL: {
                valueFn: function () {
                    var prefix = Y.Env.cdn + "uploader/assets/flashuploader.swf";

                    if (Y.UA.ie > 0) {
                        return (prefix + "?t=" + Y.guid("uploader"));
                    }

                    return prefix;
                }
            },

            /**
            * The id's or `Node` references of the DOM elements that precede
            * and follow the `Select Files` button in the tab order. Specifying
            * these allows keyboard navigation to and from the Flash player
            * layer of the uploader.
            * The two keys corresponding to the DOM elements are:
            <ul>
            *   <li> `from`: the id or the `Node` reference corresponding to the
            *     DOM element that precedes the `Select Files` button in the tab order.</li>
            *   <li> `to`: the id or the `Node` reference corresponding to the
            *     DOM element that follows the `Select Files` button in the tab order.</li>
            * </ul>
            * @attribute tabElements
            * @type {Object}
            * @default null
            */
            tabElements: {
                value: null
            },

            /**
            * The URL to which file upload requested are POSTed. Only used if a different url is not passed to the upload method call.
            *
            * @attribute uploadURL
            * @type {String}
            * @default ""
            */
            uploadURL: {
                value: ""
            },

            /**
            * The number of times to try re-uploading a file that failed to upload before
            * cancelling its upload.
            *
            * @attribute retryCount
            * @type {Number}
            * @default 3
            */
            retryCount: {
                value: 3
            }
        }
    });

    Y.UploaderFlash.Queue = UploaderQueue;