# Yahoo! UI Library

### Container 2.5.0

Yahoo! UI Library > container > Module.js (source view)

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    (function () {

        /**
        * The Container family of components is designed to enable developers to
        * create different kinds of content-containing modules on the web. Module
        * and Overlay are the most basic containers, and they can be used directly
        * or extended to build custom containers. Also part of the Container family
        * are four UI controls that extend Module and Overlay: Tooltip, Panel,
        * Dialog, and SimpleDialog.
        * @module container
        * @title Container
        * @requires yahoo, dom, event
        * @optional dragdrop, animation, button
        */

        /**
        * Module is a JavaScript representation of the Standard Module Format.
        * Standard Module Format is a simple standard for markup containers where
        * child nodes representing the header, body, and footer of the content are
        * denoted using the CSS classes "hd", "bd", and "ft" respectively.
        * Module is the base class for all other classes in the YUI
        * Container package.
        * @namespace YAHOO.widget
        * @class Module
        * @constructor
        * @param {String} el The element ID representing the Module <em>OR</em>
        * @param {HTMLElement} el The element representing the Module
        * @param {Object} userConfig The configuration Object literal containing
        * the configuration that should be set for this module. See configuration
        * documentation for more details.
        */
        YAHOO.widget.Module = function (el, userConfig) {
            if (el) {
                this.init(el, userConfig);
            } else {
                YAHOO.log("No element or element ID specified" +
                    " for Module instantiation", "error");
            }
        };

        var Dom = YAHOO.util.Dom,
            Config = YAHOO.util.Config,
            Event = YAHOO.util.Event,
            CustomEvent = YAHOO.util.CustomEvent,
            Module = YAHOO.widget.Module,

            m_oModuleTemplate,
            m_oHeaderTemplate,
            m_oBodyTemplate,
            m_oFooterTemplate,

            /**
            * Constant representing the name of the Module's events
            * @property EVENT_TYPES
            * @private
            * @final
            * @type Object
            */
            EVENT_TYPES = {

                "BEFORE_INIT": "beforeInit",
                "INIT": "init",
                "APPEND": "append",
                "BEFORE_RENDER": "beforeRender",
                "RENDER": "render",
                "CHANGE_HEADER": "changeHeader",
                "CHANGE_BODY": "changeBody",
                "CHANGE_FOOTER": "changeFooter",
                "CHANGE_CONTENT": "changeContent",
                "DESTORY": "destroy",
                "BEFORE_SHOW": "beforeShow",
                "SHOW": "show",
                "BEFORE_HIDE": "beforeHide",
                "HIDE": "hide"

            },

            /**
            * Constant representing the Module's configuration properties
            * @property DEFAULT_CONFIG
            * @private
            * @final
            * @type Object
            */
            DEFAULT_CONFIG = {

                "VISIBLE": {
                    key: "visible",
                    value: true,
                    validator: YAHOO.lang.isBoolean
                },

                "EFFECT": {
                    key: "effect",
                    suppressEvent: true,
                    supercedes: ["visible"]
                },

                "MONITOR_RESIZE": {
                    key: "monitorresize",
                    value: true
                },

                "APPEND_TO_DOCUMENT_BODY": {
                    key: "appendtodocumentbody",
                    value: false
                }
            };

        /**
        * Constant representing the prefix path to use for non-secure images
        * @property YAHOO.widget.Module.IMG_ROOT
        * @static
        * @final
        * @type String
        */
        Module.IMG_ROOT = null;

        /**
        * Constant representing the prefix path to use for securely served images
        * @property YAHOO.widget.Module.IMG_ROOT_SSL
        * @static
        * @final
        * @type String
        */
        Module.IMG_ROOT_SSL = null;

        /**
        * Constant for the default CSS class name that represents a Module
        * @property YAHOO.widget.Module.CSS_MODULE
        * @static
        * @final
        * @type String
        */
        Module.CSS_MODULE = "yui-module";

        /**
        * Constant representing the module header
        * @property YAHOO.widget.Module.CSS_HEADER
        * @static
        * @final
        * @type String
        */
        Module.CSS_HEADER = "hd";

        /**
        * Constant representing the module body
        * @property YAHOO.widget.Module.CSS_BODY
        * @static
        * @final
        * @type String
        */
        Module.CSS_BODY = "bd";

        /**
        * Constant representing the module footer
        * @property YAHOO.widget.Module.CSS_FOOTER
        * @static
        * @final
        * @type String
        */
        Module.CSS_FOOTER = "ft";

        /**
        * Constant representing the url for the "src" attribute of the iframe
        * used to monitor changes to the browser's base font size
        * @property YAHOO.widget.Module.RESIZE_MONITOR_SECURE_URL
        * @static
        * @final
        * @type String
        */
        Module.RESIZE_MONITOR_SECURE_URL = "javascript:false;";

        /**
        * Singleton CustomEvent fired when the font size is changed in the browser.
        * Opera's "zoom" functionality currently does not support text
        * size detection.
        * @event YAHOO.widget.Module.textResizeEvent
        */
        Module.textResizeEvent = new CustomEvent("textResize");

        function createModuleTemplate() {

            if (!m_oModuleTemplate) {
                m_oModuleTemplate = document.createElement("div");

                m_oModuleTemplate.innerHTML = ("<div class=\"" +
                    Module.CSS_HEADER + "\"></div>" + "<div class=\"" +
                    Module.CSS_BODY + "\"></div><div class=\"" +
                    Module.CSS_FOOTER + "\"></div>");

                m_oHeaderTemplate = m_oModuleTemplate.firstChild;
                m_oBodyTemplate = m_oHeaderTemplate.nextSibling;
                m_oFooterTemplate = m_oBodyTemplate.nextSibling;
            }

            return m_oModuleTemplate;
        }

        function createHeader() {
            if (!m_oHeaderTemplate) {
                createModuleTemplate();
            }
            return (m_oHeaderTemplate.cloneNode(false));
        }

        function createBody() {
            if (!m_oBodyTemplate) {
                createModuleTemplate();
            }
            return (m_oBodyTemplate.cloneNode(false));
        }

        function createFooter() {
            if (!m_oFooterTemplate) {
                createModuleTemplate();
            }
            return (m_oFooterTemplate.cloneNode(false));
        }

        Module.prototype = {

            /**
            * The class's constructor function
            * @property contructor
            * @type Function
            */
            constructor: Module,

            /**
            * The main module element that contains the header, body, and footer
            * @property element
            * @type HTMLElement
            */
            element: null,

            /**
            * The header element, denoted with CSS class "hd"
            * @property header
            * @type HTMLElement
            */
            header: null,

            /**
            * The body element, denoted with CSS class "bd"
            * @property body
            * @type HTMLElement
            */
            body: null,

            /**
            * The footer element, denoted with CSS class "ft"
            * @property footer
            * @type HTMLElement
            */
            footer: null,

            /**
            * The id of the element
            * @property id
            * @type String
            */
            id: null,

            /**
            * A string representing the root path for all images created by
            * a Module instance.
            * @deprecated It is recommend that any images for a Module be applied
            * via CSS using the "background-image" property.
            * @property imageRoot
            * @type String
            */
            imageRoot: Module.IMG_ROOT,

            /**
            * Initializes the custom events for Module which are fired
            * automatically at appropriate times by the Module class.
            * @method initEvents
            */
            initEvents: function () {

                var SIGNATURE = CustomEvent.LIST;

                /**
                * CustomEvent fired prior to class initalization.
                * @event beforeInitEvent
                * @param {class} classRef class reference of the initializing
                * class, such as this.beforeInitEvent.fire(Module)
                */
                this.beforeInitEvent = this.createEvent(EVENT_TYPES.BEFORE_INIT);
                this.beforeInitEvent.signature = SIGNATURE;

                /**
                * CustomEvent fired after class initalization.
                * @event initEvent
                * @param {class} classRef class reference of the initializing
                * class, such as this.beforeInitEvent.fire(Module)
                */
                this.initEvent = this.createEvent(EVENT_TYPES.INIT);
                this.initEvent.signature = SIGNATURE;

                /**
                * CustomEvent fired when the Module is appended to the DOM
                * @event appendEvent
                */
                this.appendEvent = this.createEvent(EVENT_TYPES.APPEND);
                this.appendEvent.signature = SIGNATURE;

                /**
                * CustomEvent fired before the Module is rendered
                * @event beforeRenderEvent
                */
                this.beforeRenderEvent = this.createEvent(EVENT_TYPES.BEFORE_RENDER);
                this.beforeRenderEvent.signature = SIGNATURE;

                /**
                * CustomEvent fired after the Module is rendered
                * @event renderEvent
                */
                this.renderEvent = this.createEvent(EVENT_TYPES.RENDER);
                this.renderEvent.signature = SIGNATURE;

                /**
                * CustomEvent fired when the header content of the Module
                * is modified
                * @event changeHeaderEvent
                * @param {String/HTMLElement} content String/element representing
                * the new header content
                */
                this.changeHeaderEvent = this.createEvent(EVENT_TYPES.CHANGE_HEADER);
                this.changeHeaderEvent.signature = SIGNATURE;

                /**
                * CustomEvent fired when the body content of the Module is modified
                * @event changeBodyEvent
                * @param {String/HTMLElement} content String/element representing
                * the new body content
                */
                this.changeBodyEvent = this.createEvent(EVENT_TYPES.CHANGE_BODY);
                this.changeBodyEvent.signature = SIGNATURE;

                /**
                * CustomEvent fired when the footer content of the Module
                * is modified
                * @event changeFooterEvent
                * @param {String/HTMLElement} content String/element representing
                * the new footer content
                */
                this.changeFooterEvent = this.createEvent(EVENT_TYPES.CHANGE_FOOTER);
                this.changeFooterEvent.signature = SIGNATURE;

                /**
                * CustomEvent fired when the content of the Module is modified
                * @event changeContentEvent
                */
                this.changeContentEvent = this.createEvent(EVENT_TYPES.CHANGE_CONTENT);
                this.changeContentEvent.signature = SIGNATURE;

                /**
                * CustomEvent fired when the Module is destroyed
                * @event destroyEvent
                */
                this.destroyEvent = this.createEvent(EVENT_TYPES.DESTORY);
                this.destroyEvent.signature = SIGNATURE;

                /**
                * CustomEvent fired before the Module is shown
                * @event beforeShowEvent
                */
                this.beforeShowEvent = this.createEvent(EVENT_TYPES.BEFORE_SHOW);
                this.beforeShowEvent.signature = SIGNATURE;

                /**
                * CustomEvent fired after the Module is shown
                * @event showEvent
                */
                this.showEvent = this.createEvent(EVENT_TYPES.SHOW);
                this.showEvent.signature = SIGNATURE;

                /**
                * CustomEvent fired before the Module is hidden
                * @event beforeHideEvent
                */
                this.beforeHideEvent = this.createEvent(EVENT_TYPES.BEFORE_HIDE);
                this.beforeHideEvent.signature = SIGNATURE;

                /**
                * CustomEvent fired after the Module is hidden
                * @event hideEvent
                */
                this.hideEvent = this.createEvent(EVENT_TYPES.HIDE);
                this.hideEvent.signature = SIGNATURE;
            },

            /**
            * String representing the current user-agent platform
            * @property platform
            * @type String
            */
            platform: function () {
                var ua = navigator.userAgent.toLowerCase();

                if (ua.indexOf("windows") != -1 || ua.indexOf("win32") != -1) {
                    return "windows";
                } else if (ua.indexOf("macintosh") != -1) {
                    return "mac";
                } else {
                    return false;
                }
            }(),

            /**
            * String representing the user-agent of the browser
            * @deprecated Use YAHOO.env.ua
            * @property browser
            * @type String
            */
            browser: function () {
                var ua = navigator.userAgent.toLowerCase();
                /*
                     Check Opera first in case of spoof and check Safari before
                     Gecko since Safari's user agent string includes "like Gecko"
                */
                if (ua.indexOf('opera') != -1) {
                    return 'opera';
                } else if (ua.indexOf('msie 7') != -1) {
                    return 'ie7';
                } else if (ua.indexOf('msie') != -1) {
                    return 'ie';
                } else if (ua.indexOf('safari') != -1) {
                    return 'safari';
                } else if (ua.indexOf('gecko') != -1) {
                    return 'gecko';
                } else {
                    return false;
                }
            }(),

            /**
            * Boolean representing whether or not the current browsing context is
            * secure (https)
            * @property isSecure
            * @type Boolean
            */
            isSecure: function () {
                if (window.location.href.toLowerCase().indexOf("https") === 0) {
                    return true;
                } else {
                    return false;
                }
            }(),

            /**
            * Initializes the custom events for Module which are fired
            * automatically at appropriate times by the Module class.
            */
            initDefaultConfig: function () {
                // Add properties //
                /**
                * Specifies whether the Module is visible on the page.
                * @config visible
                * @type Boolean
                * @default true
                */
                this.cfg.addProperty(DEFAULT_CONFIG.VISIBLE.key, {
                    handler: this.configVisible,
                    value: DEFAULT_CONFIG.VISIBLE.value,
                    validator: DEFAULT_CONFIG.VISIBLE.validator
                });

                /**
                * Object or array of objects representing the ContainerEffect
                * classes that are active for animating the container.
                * @config effect
                * @type Object
                * @default null
                */
                this.cfg.addProperty(DEFAULT_CONFIG.EFFECT.key, {
                    suppressEvent: DEFAULT_CONFIG.EFFECT.suppressEvent,
                    supercedes: DEFAULT_CONFIG.EFFECT.supercedes
                });

                /**
                * Specifies whether to create a special proxy iframe to monitor
                * for user font resizing in the document
                * @config monitorresize
                * @type Boolean
                * @default true
                */
                this.cfg.addProperty(DEFAULT_CONFIG.MONITOR_RESIZE.key, {
                    handler: this.configMonitorResize,
                    value: DEFAULT_CONFIG.MONITOR_RESIZE.value
                });

                /**
                * Specifies if the module should be rendered as the first child
                * of document.body or appended as the last child when render is called
                * with document.body as the "appendToNode".
                * <p>
                * Appending to the body while the DOM is still being constructed can
                * lead to Operation Aborted errors in IE hence this flag is set to
                * false by default.
                * </p>
                *
                * @config appendtodocumentbody
                * @type Boolean
                * @default false
                */
                this.cfg.addProperty(DEFAULT_CONFIG.APPEND_TO_DOCUMENT_BODY.key, {
                    value: DEFAULT_CONFIG.APPEND_TO_DOCUMENT_BODY.value
                });
            },

            /**
            * The Module class's initialization method, which is executed for
            * Module and all of its subclasses. This method is automatically
            * called by the constructor, and  sets up all DOM references for
            * pre-existing markup, and creates required markup if it is not
            * already present.
            * @method init
            * @param {String} el The element ID representing the Module <em>OR</em>
            * @param {HTMLElement} el The element representing the Module
            * @param {Object} userConfig The configuration Object literal
            * containing the configuration that should be set for this module.
            * See configuration documentation for more details.
            */
            init: function (el, userConfig) {

                var elId, child;

                this.initEvents();
                this.beforeInitEvent.fire(Module);

                /**
                * The Module's Config object used for monitoring
                * configuration properties.
                * @property cfg
                * @type YAHOO.util.Config
                */
                this.cfg = new Config(this);

                if (this.isSecure) {
                    this.imageRoot = Module.IMG_ROOT_SSL;
                }

                if (typeof el == "string") {
                    elId = el;
                    el = document.getElementById(el);
                    if (! el) {
                        el = (createModuleTemplate()).cloneNode(false);
                        el.id = elId;
                    }
                }

                this.element = el;

                if (el.id) {
                    this.id = el.id;
                }

                child = this.element.firstChild;

                if (child) {
                    var fndHd = false, fndBd = false, fndFt = false;
                    do {
                        // We're looking for elements
                        if (1 == child.nodeType) {
                            if (!fndHd && Dom.hasClass(child, Module.CSS_HEADER)) {
                                this.header = child;
                                fndHd = true;
                            } else if (!fndBd && Dom.hasClass(child, Module.CSS_BODY)) {
                                this.body = child;
                                fndBd = true;
                            } else if (!fndFt && Dom.hasClass(child, Module.CSS_FOOTER)){
                                this.footer = child;
                                fndFt = true;
                            }
                        }
                    } while ((child = child.nextSibling));
                }

                this.initDefaultConfig();

                Dom.addClass(this.element, Module.CSS_MODULE);

                if (userConfig) {
                    this.cfg.applyConfig(userConfig, true);
                }

                /*
                    Subscribe to the fireQueue() method of Config so that any
                    queued configuration changes are excecuted upon render of
                    the Module
                */

                if (!Config.alreadySubscribed(this.renderEvent, this.cfg.fireQueue, this.cfg)) {
                    this.renderEvent.subscribe(this.cfg.fireQueue, this.cfg, true);
                }

                this.initEvent.fire(Module);
            },

            /**
            * Initialize an empty IFRAME that is placed out of the visible area
            * that can be used to detect text resize.
            * @method initResizeMonitor
            */
            initResizeMonitor: function () {

                var isGeckoWin = (YAHOO.env.ua.gecko && this.platform == "windows");
                if (isGeckoWin) {
                    // Help prevent spinning loading icon which
                    // started with FireFox 2.0.0.8/Win
                    var self = this;
                    setTimeout(function(){self._initResizeMonitor();}, 0);
                } else {
                    this._initResizeMonitor();
                }
            },

            /**
             * Create and initialize the text resize monitoring iframe.
             *
             * @protected
             * @method _initResizeMonitor
             */
            _initResizeMonitor : function() {

                var oDoc,
                    oIFrame,
                    sHTML;

                function fireTextResize() {
                    Module.textResizeEvent.fire();
                }

                if (!YAHOO.env.ua.opera) {
                    oIFrame = Dom.get("_yuiResizeMonitor");

                    var supportsCWResize = this._supportsCWResize();

                    if (!oIFrame) {
                        oIFrame = document.createElement("iframe");

                        if (this.isSecure && Module.RESIZE_MONITOR_SECURE_URL && YAHOO.env.ua.ie) {
                            oIFrame.src = Module.RESIZE_MONITOR_SECURE_URL;
                        }

                        if (!supportsCWResize) {
                            // Can't monitor on contentWindow, so fire from inside iframe
                            sHTML = ["<html><head><script ",
                                     "type=\"text/javascript\">",
                                     "window.onresize=function(){window.parent.",
                                     "YAHOO.widget.Module.textResizeEvent.",
                                     "fire();};<",
                                     "\/script></head>",
                                     "<body></body></html>"].join('');

                            oIFrame.src = "data:text/html;charset=utf-8," + encodeURIComponent(sHTML);
                        }

                        oIFrame.id = "_yuiResizeMonitor";
                        /*
                            Need to set "position" property before inserting the
                            iframe into the document or Safari's status bar will
                            forever indicate the iframe is loading
                            (See SourceForge bug #1723064)
                        */
                        oIFrame.style.position = "absolute";
                        oIFrame.style.visibility = "hidden";

                        var db = document.body,
                            fc = db.firstChild;
                        if (fc) {
                            db.insertBefore(oIFrame, fc);
                        } else {
                            db.appendChild(oIFrame);
                        }

                        oIFrame.style.width = "10em";
                        oIFrame.style.height = "10em";
                        oIFrame.style.top = (-1 * oIFrame.offsetHeight) + "px";
                        oIFrame.style.left = (-1 * oIFrame.offsetWidth) + "px";
                        oIFrame.style.borderWidth = "0";
                        oIFrame.style.visibility = "visible";

                        /*
                           Don't open/close the document for Gecko like we used to, since it
                           leads to duplicate cookies. (See SourceForge bug #1721755)
                        */
                        if (YAHOO.env.ua.webkit) {
                            oDoc = oIFrame.contentWindow.document;
                            oDoc.open();
                            oDoc.close();
                        }
                    }

                    if (oIFrame && oIFrame.contentWindow) {
                        Module.textResizeEvent.subscribe(this.onDomResize, this, true);

                        if (!Module.textResizeInitialized) {
                            if (supportsCWResize) {
                                if (!Event.on(oIFrame.contentWindow, "resize", fireTextResize)) {
                                    /*
                                         This will fail in IE if document.domain has
                                         changed, so we must change the listener to
                                         use the oIFrame element instead
                                    */
                                    Event.on(oIFrame, "resize", fireTextResize);
                                }
                            }
                            Module.textResizeInitialized = true;
                        }
                        this.resizeMonitor = oIFrame;
                    }
                }
            },

            /**
             * Text resize monitor helper method.
             * Determines if the browser supports resize events on iframe content windows.
             *
             * @private
             * @method _supportsCWResize
             */
            _supportsCWResize : function() {
                /*
                    Gecko 1.8.0 (FF1.5), 1.8.1.0-5 (FF2) won't fire resize on contentWindow.
                    Gecko 1.8.1.6+ (FF2.0.0.6+) and all other browsers will fire resize on contentWindow.

                    We don't want to start sniffing for patch versions, so fire textResize the same
                    way on all FF, until 1.9 (3.x) is out
                 */
                var bSupported = true;
                if (YAHOO.env.ua.gecko && YAHOO.env.ua.gecko <= 1.8) {
                    bSupported = false;
                    /*
                    var v = navigator.userAgent.match(/rv:([^\s\)]*)/); // From YAHOO.env.ua
                    if (v && v[0]) {
                        var sv = v[0].match(/\d\.\d\.(\d)/);
                        if (sv && sv[1]) {
                            if (parseInt(sv[1], 10) > 0) {
                                bSupported = true;
                            }
                        }
                    }
                    */
                }
                return bSupported;
            },

            /**
            * Event handler fired when the resize monitor element is resized.
            * @method onDomResize
            * @param {DOMEvent} e The DOM resize event
            * @param {Object} obj The scope object passed to the handler
            */
            onDomResize: function (e, obj) {

                var nLeft = -1 * this.resizeMonitor.offsetWidth,
                    nTop = -1 * this.resizeMonitor.offsetHeight;

                this.resizeMonitor.style.top = nTop + "px";
                this.resizeMonitor.style.left =  nLeft + "px";

            },

            /**
            * Sets the Module's header content to the string specified, or appends
            * the passed element to the header. If no header is present, one will
            * be automatically created. An empty string can be passed to the method
            * to clear the contents of the header.
            *
            * @method setHeader
            * @param {String} headerContent The string used to set the header.
            * As a convenience, non HTMLElement objects can also be passed into
            * the method, and will be treated as strings, with the header innerHTML
            * set to their default toString implementations.
            * <em>OR</em>
            * @param {HTMLElement} headerContent The HTMLElement to append to
            * the header
            */
            setHeader: function (headerContent) {
                var oHeader = this.header || (this.header = createHeader());

                if (headerContent.tagName) {
                    oHeader.innerHTML = "";
                    oHeader.appendChild(headerContent);
                } else {
                    oHeader.innerHTML = headerContent;
                }

                this.changeHeaderEvent.fire(headerContent);
                this.changeContentEvent.fire();

            },

            /**
            * Appends the passed element to the header. If no header is present,
            * one will be automatically created.
            * @method appendToHeader
            * @param {HTMLElement} element The element to append to the header
            */
            appendToHeader: function (element) {
                var oHeader = this.header || (this.header = createHeader());

                oHeader.appendChild(element);

                this.changeHeaderEvent.fire(element);
                this.changeContentEvent.fire();

            },

            /**
            * Sets the Module's body content to the HTML specified, or appends the
            * passed element to the body. If no body is present, one will be
            * automatically created. An empty string can be passed to the method
            * to clear the contents of the body.
            * @method setBody
            * @param {String} bodyContent The HTML used to set the body.
            * As a convenience, non HTMLElement objects can also be passed into
            * the method, and will be treated as strings, with the body innerHTML
            * set to their default toString implementations.
            * <em>OR</em>
            * @param {HTMLElement} bodyContent The HTMLElement to append to the body
            */
            setBody: function (bodyContent) {
                var oBody = this.body || (this.body = createBody());

                if (bodyContent.tagName) {
                    oBody.innerHTML = "";
                    oBody.appendChild(bodyContent);
                } else {
                    oBody.innerHTML = bodyContent;
                }

                this.changeBodyEvent.fire(bodyContent);
                this.changeContentEvent.fire();
            },

            /**
            * Appends the passed element to the body. If no body is present, one
            * will be automatically created.
            * @method appendToBody
            * @param {HTMLElement} element The element to append to the body
            */
            appendToBody: function (element) {
                var oBody = this.body || (this.body = createBody());

                oBody.appendChild(element);

                this.changeBodyEvent.fire(element);
                this.changeContentEvent.fire();

            },

            /**
            * Sets the Module's footer content to the HTML specified, or appends
            * the passed element to the footer. If no footer is present, one will
            * be automatically created. An empty string can be passed to the method
            * to clear the contents of the footer.
            * @method setFooter
            * @param {String} footerContent The HTML used to set the footer
            * As a convenience, non HTMLElement objects can also be passed into
            * the method, and will be treated as strings, with the footer innerHTML
            * set to their default toString implementations.
            * <em>OR</em>
            * @param {HTMLElement} footerContent The HTMLElement to append to
            * the footer
            */
            setFooter: function (footerContent) {

                var oFooter = this.footer || (this.footer = createFooter());

                if (footerContent.tagName) {
                    oFooter.innerHTML = "";
                    oFooter.appendChild(footerContent);
                } else {
                    oFooter.innerHTML = footerContent;
                }

                this.changeFooterEvent.fire(footerContent);
                this.changeContentEvent.fire();

            },

            /**
            * Appends the passed element to the footer. If no footer is present,
            * one will be automatically created.
            * @method appendToFooter
            * @param {HTMLElement} element The element to append to the footer
            */
            appendToFooter: function (element) {

                var oFooter = this.footer || (this.footer = createFooter());

                oFooter.appendChild(element);

                this.changeFooterEvent.fire(element);
                this.changeContentEvent.fire();

            },

            /**
            * Renders the Module by inserting the elements that are not already
            * in the main Module into their correct places. Optionally appends
            * the Module to the specified node prior to the render's execution.
            * <p>
            * For Modules without existing markup, the appendToNode argument
            * is REQUIRED. If this argument is ommitted and the current element is
            * not present in the document, the function will return false,
            * indicating that the render was a failure.
            * </p>
            * <p>
            * NOTE: As of 2.3.1, if the appendToNode is the document's body element
            * then the module is rendered as the first child of the body element,
            * and not appended to it, to avoid Operation Aborted errors in IE when
            * rendering the module before window's load event is fired. You can
            * use the appendtodocumentbody configuration property to change this
            * to append to document.body if required.
            * </p>
            * @method render
            * @param {String} appendToNode The element id to which the Module
            * should be appended to prior to rendering <em>OR</em>
            * @param {HTMLElement} appendToNode The element to which the Module
            * should be appended to prior to rendering
            * @param {HTMLElement} moduleElement OPTIONAL. The element that
            * represents the actual Standard Module container.
            * @return {Boolean} Success or failure of the render
            */
            render: function (appendToNode, moduleElement) {

                var me = this,
                    firstChild;

                function appendTo(parentNode) {
                    if (typeof parentNode == "string") {
                        parentNode = document.getElementById(parentNode);
                    }

                    if (parentNode) {
                        me._addToParent(parentNode, me.element);
                        me.appendEvent.fire();
                    }
                }

                this.beforeRenderEvent.fire();

                if (! moduleElement) {
                    moduleElement = this.element;
                }

                if (appendToNode) {
                    appendTo(appendToNode);
                } else {
                    // No node was passed in. If the element is not already in the Dom, this fails
                    if (! Dom.inDocument(this.element)) {
                        YAHOO.log("Render failed. Must specify appendTo node if " + " Module isn't already in the DOM.", "error");
                        return false;
                    }
                }

                // Need to get everything into the DOM if it isn't already
                if (this.header && ! Dom.inDocument(this.header)) {
                    // There is a header, but it's not in the DOM yet. Need to add it.
                    firstChild = moduleElement.firstChild;
                    if (firstChild) {
                        moduleElement.insertBefore(this.header, firstChild);
                    } else {
                        moduleElement.appendChild(this.header);
                    }
                }

                if (this.body && ! Dom.inDocument(this.body)) {
                    // There is a body, but it's not in the DOM yet. Need to add it.
                    if (this.footer && Dom.isAncestor(this.moduleElement, this.footer)) {
                        moduleElement.insertBefore(this.body, this.footer);
                    } else {
                        moduleElement.appendChild(this.body);
                    }
                }

                if (this.footer && ! Dom.inDocument(this.footer)) {
                    // There is a footer, but it's not in the DOM yet. Need to add it.
                    moduleElement.appendChild(this.footer);
                }

                this.renderEvent.fire();
                return true;
            },

            /**
            * Removes the Module element from the DOM and sets all child elements
            * to null.
            * @method destroy
            */
            destroy: function () {

                var parent,
                    e;

                if (this.element) {
                    Event.purgeElement(this.element, true);
                    parent = this.element.parentNode;
                }

                if (parent) {
                    parent.removeChild(this.element);
                }

                this.element = null;
                this.header = null;
                this.body = null;
                this.footer = null;

                Module.textResizeEvent.unsubscribe(this.onDomResize, this);

                this.cfg.destroy();
                this.cfg = null;

                this.destroyEvent.fire();

                for (e in this) {
                    if (e instanceof CustomEvent) {
                        e.unsubscribeAll();
                    }
                }

            },

            /**
            * Shows the Module element by setting the visible configuration
            * property to true. Also fires two events: beforeShowEvent prior to
            * the visibility change, and showEvent after.
            * @method show
            */
            show: function () {
                this.cfg.setProperty("visible", true);
            },

            /**
            * Hides the Module element by setting the visible configuration
            * property to false. Also fires two events: beforeHideEvent prior to
            * the visibility change, and hideEvent after.
            * @method hide
            */
            hide: function () {
                this.cfg.setProperty("visible", false);
            },

            // BUILT-IN EVENT HANDLERS FOR MODULE //
            /**
            * Default event handler for changing the visibility property of a
            * Module. By default, this is achieved by switching the "display" style
            * between "block" and "none".
            * This method is responsible for firing showEvent and hideEvent.
            * @param {String} type The CustomEvent type (usually the property name)
            * @param {Object[]} args The CustomEvent arguments. For configuration
            * handlers, args[0] will equal the newly applied value for the property.
            * @param {Object} obj The scope object. For configuration handlers,
            * this will usually equal the owner.
            * @method configVisible
            */
            configVisible: function (type, args, obj) {
                var visible = args[0];
                if (visible) {
                    this.beforeShowEvent.fire();
                    Dom.setStyle(this.element, "display", "block");
                    this.showEvent.fire();
                } else {
                    this.beforeHideEvent.fire();
                    Dom.setStyle(this.element, "display", "none");
                    this.hideEvent.fire();
                }
            },

            /**
            * Default event handler for the "monitorresize" configuration property
            * @param {String} type The CustomEvent type (usually the property name)
            * @param {Object[]} args The CustomEvent arguments. For configuration
            * handlers, args[0] will equal the newly applied value for the property.
            * @param {Object} obj The scope object. For configuration handlers,
            * this will usually equal the owner.
            * @method configMonitorResize
            */
            configMonitorResize: function (type, args, obj) {
                var monitor = args[0];
                if (monitor) {
                    this.initResizeMonitor();
                } else {
                    Module.textResizeEvent.unsubscribe(this.onDomResize, this, true);
                    this.resizeMonitor = null;
                }
            },

            /**
             * This method is a protected helper, used when constructing the DOM structure for the module
             * to account for situations which may cause Operation Aborted errors in IE. It should not
             * be used for general DOM construction.
             * <p>
             * If the parentNode is not document.body, the element is appended as the last element.
             * </p>
             * <p>
             * If the parentNode is document.body the element is added as the first child to help
             * prevent Operation Aborted errors in IE.
             * </p>
             *
             * @param {parentNode} The HTML element to which the element will be added
             * @param {element} The HTML element to be added to parentNode's children
             * @method _addToParent
             * @protected
             */
            _addToParent: function(parentNode, element) {
                if (!this.cfg.getProperty("appendtodocumentbody") && parentNode === document.body && parentNode.firstChild) {
                    parentNode.insertBefore(element, parentNode.firstChild);
                } else {
                    parentNode.appendChild(element);
                }
            },

            /**
            * Returns a String representation of the Object.
            * @method toString
            * @return {String} The string representation of the Module
            */
            toString: function () {
                return "Module " + this.id;
            }
        };

        YAHOO.lang.augmentProto(Module, YAHOO.util.EventProvider);

    }());

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