# Yahoo! UI Library

### Container 2.4.1

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

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    (function () {

        /**
        * Dialog is an implementation of Panel that can be used to submit form
        * data. Built-in functionality for buttons with event handlers is included,
        * and button sets can be build dynamically, or the preincluded ones for
        * Submit/Cancel and OK/Cancel can be utilized. Forms can be processed in 3
        * ways -- via an asynchronous Connection utility call, a simple form
        * POST or GET, or manually.
        * @namespace YAHOO.widget
        * @class Dialog
        * @extends YAHOO.widget.Panel
        * @constructor
        * @param {String} el The element ID representing the Dialog <em>OR</em>
        * @param {HTMLElement} el The element representing the Dialog
        * @param {Object} userConfig The configuration object literal containing
        * the configuration that should be set for this Dialog. See configuration
        * documentation for more details.
        */
        YAHOO.widget.Dialog = function (el, userConfig) {

            YAHOO.widget.Dialog.superclass.constructor.call(this, el, userConfig);

        };

        var Event = YAHOO.util.Event,
            CustomEvent = YAHOO.util.CustomEvent,
            Dom = YAHOO.util.Dom,
            KeyListener = YAHOO.util.KeyListener,
            Connect = YAHOO.util.Connect,
            Dialog = YAHOO.widget.Dialog,
            Lang = YAHOO.lang,

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

                "BEFORE_SUBMIT": "beforeSubmit",
                "SUBMIT": "submit",
                "MANUAL_SUBMIT": "manualSubmit",
                "ASYNC_SUBMIT": "asyncSubmit",
                "FORM_SUBMIT": "formSubmit",
                "CANCEL": "cancel"

            },

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

                "POST_METHOD": {
                    key: "postmethod",
                    value: "async"
                },

                "BUTTONS": {
                    key: "buttons",
                    value: "none"
                }
            };

        /**
        * Constant representing the default CSS class used for a Dialog
        * @property YAHOO.widget.Dialog.CSS_DIALOG
        * @static
        * @final
        * @type String
        */
        Dialog.CSS_DIALOG = "yui-dialog";

        function removeButtonEventHandlers() {

            var aButtons = this._aButtons,
                nButtons,
                oButton,
                i;

            if (Lang.isArray(aButtons)) {
                nButtons = aButtons.length;

                if (nButtons > 0) {
                    i = nButtons - 1;
                    do {
                        oButton = aButtons[i];

                        if (YAHOO.widget.Button && oButton instanceof YAHOO.widget.Button) {
                            oButton.destroy();
                        }
                        else if (oButton.tagName.toUpperCase() == "BUTTON") {
                            Event.purgeElement(oButton);
                            Event.purgeElement(oButton, false);
                        }
                    }
                    while (i--);
                }
            }
        }

        YAHOO.extend(Dialog, YAHOO.widget.Panel, {

            /**
            * @property form
            * @description Object reference to the Dialog's
            * <code>&#60;form&#62;</code> element.
            * @default null
            * @type <a href="http://www.w3.org/TR/2000/WD-DOM-Level-1-20000929/
            * level-one-html.html#ID-40002357">HTMLFormElement</a>
            */
            form: null,

            /**
            * Initializes the class's configurable properties which can be changed
            * using the Dialog's Config object (cfg).
            * @method initDefaultConfig
            */
            initDefaultConfig: function () {
                Dialog.superclass.initDefaultConfig.call(this);

                /**
                * The internally maintained callback object for use with the
                * Connection utility
                * @property callback
                * @type Object
                */
                this.callback = {

                    /**
                    * The function to execute upon success of the
                    * Connection submission
                    * @property callback.success
                    * @type Function
                    */
                    success: null,

                    /**
                    * The function to execute upon failure of the
                    * Connection submission
                    * @property callback.failure
                    * @type Function
                    */
                    failure: null,

                    /**
                    * The arbitraty argument or arguments to pass to the Connection
                    * callback functions
                    * @property callback.argument
                    * @type Object
                    */
                    argument: null

                };

                // Add form dialog config properties //

                /**
                * The method to use for posting the Dialog's form. Possible values
                * are "async", "form", and "manual".
                * @config postmethod
                * @type String
                * @default async
                */
                this.cfg.addProperty(DEFAULT_CONFIG.POST_METHOD.key, {
                    handler: this.configPostMethod,
                    value: DEFAULT_CONFIG.POST_METHOD.value,
                    validator: function (val) {
                        if (val != "form" && val != "async" && val != "none" &&
                            val != "manual") {
                            return false;
                        } else {
                            return true;
                        }
                    }
                });

                /**
                * Array of object literals, each containing a set of properties
                * defining a button to be appended into the Dialog's footer.
                * Each button object in the buttons array can have three properties:
                * <dt>text:</dt>
                * <dd>The text that will display on the face of the button.  <em>
                * Please note:</em> As of version 2.3, the text can include
                * HTML.</dd>
                * <dt>handler:</dt>
                * <dd>Can be either:
                *     <ol>
                *         <li>A reference to a function that should fire when the
                * button is clicked.  (In this case scope of this function is
                * always its Dialog instance.)</li>
                *         <li>An object literal representing the code to be
                * executed when the button is clicked.  Format:<br> <code> {<br>
                * <strong>fn:</strong> Function,   &#47;&#47; The handler to call
                * when  the event fires.<br> <strong>obj:</strong> Object,
                * &#47;&#47; An  object to pass back to the handler.<br> <strong>
                * scope:</strong>  Object &#47;&#47; The object to use for the
                * scope of the handler. <br> } </code> <br><em>Please note: this
                * functionality was added in version 2.3.</em></li>
                *     </ol>
                * </dd>
                * <dt>isDefault:</dt>
                * <dd>An optional boolean value that specifies that a button
                * should be highlighted and focused by default.</dd>
                * @config buttons
                * @type {Array|String}
                * @default "none"
                */
                this.cfg.addProperty(DEFAULT_CONFIG.BUTTONS.key, {
                    handler: this.configButtons,
                    value: DEFAULT_CONFIG.BUTTONS.value
                });

            },

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

                var SIGNATURE = CustomEvent.LIST;

                /**
                * CustomEvent fired prior to submission
                * @event beforeSubmitEvent
                */
                this.beforeSubmitEvent =
                    this.createEvent(EVENT_TYPES.BEFORE_SUBMIT);
                this.beforeSubmitEvent.signature = SIGNATURE;

                /**
                * CustomEvent fired after submission
                * @event submitEvent
                */
                this.submitEvent = this.createEvent(EVENT_TYPES.SUBMIT);
                this.submitEvent.signature = SIGNATURE;

                /**
                * CustomEvent fired prior to manual submission
                * @event manualSubmitEvent
                */
                this.manualSubmitEvent =
                    this.createEvent(EVENT_TYPES.MANUAL_SUBMIT);
                this.manualSubmitEvent.signature = SIGNATURE;

                /**
                * CustomEvent fired prior to asynchronous submission
                * @event asyncSubmitEvent
                */
                this.asyncSubmitEvent = this.createEvent(EVENT_TYPES.ASYNC_SUBMIT);
                this.asyncSubmitEvent.signature = SIGNATURE;

                /**
                * CustomEvent fired prior to form-based submission
                * @event formSubmitEvent
                */
                this.formSubmitEvent = this.createEvent(EVENT_TYPES.FORM_SUBMIT);
                this.formSubmitEvent.signature = SIGNATURE;

                /**
                * CustomEvent fired after cancel
                * @event cancelEvent
                */
                this.cancelEvent = this.createEvent(EVENT_TYPES.CANCEL);
                this.cancelEvent.signature = SIGNATURE;

            },

            /**
            * The Dialog initialization method, which is executed for Dialog 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 Dialog <em>OR</em>
            * @param {HTMLElement} el The element representing the Dialog
            * @param {Object} userConfig The configuration object literal
            * containing the configuration that should be set for this Dialog.
            * See configuration documentation for more details.
            */
            init: function (el, userConfig) {

                /*
                     Note that we don't pass the user config in here yet because
                     we only want it executed once, at the lowest subclass level
                */

                Dialog.superclass.init.call(this, el/*, userConfig*/);

                this.beforeInitEvent.fire(Dialog);

                Dom.addClass(this.element, Dialog.CSS_DIALOG);

                this.cfg.setProperty("visible", false);

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

                this.showEvent.subscribe(this.focusFirst, this, true);
                this.beforeHideEvent.subscribe(this.blurButtons, this, true);

                this.subscribe("changeBody", this.registerForm);

                this.initEvent.fire(Dialog);
            },

            /**
            * Submits the Dialog's form depending on the value of the
            * "postmethod" configuration property.  <strong>Please note:
            * </strong> As of version 2.3 this method will automatically handle
            * asyncronous file uploads should the Dialog instance's form contain
            * <code>&#60;input type="file"&#62;</code> elements.  If a Dialog
            * instance will be handling asyncronous file uploads, its
            * <code>callback</code> property will need to be setup with a
            * <code>upload</code> handler rather than the standard
            * <code>success</code> and, or <code>failure</code> handlers.  For more
            * information, see the <a href="http://developer.yahoo.com/yui/
            * connection/#file">Connection Manager documenation on file uploads</a>.
            * @method doSubmit
            */
            doSubmit: function () {

                var oForm = this.form,
                    bUseFileUpload = false,
                    bUseSecureFileUpload = false,
                    aElements,
                    nElements,
                    i,
                    sMethod;

                switch (this.cfg.getProperty("postmethod")) {

                case "async":

                    aElements = oForm.elements;
                    nElements = aElements.length;

                    if (nElements > 0) {

                        i = nElements - 1;

                        do {

                            if (aElements[i].type == "file") {

                                bUseFileUpload = true;
                                break;

                            }

                        }
                        while(i--);

                    }

                    if (bUseFileUpload && YAHOO.env.ua.ie && this.isSecure) {

                        bUseSecureFileUpload = true;

                    }

                    sMethod =
                        (oForm.getAttribute("method") || "POST").toUpperCase();

                    Connect.setForm(oForm, bUseFileUpload, bUseSecureFileUpload);

                    Connect.asyncRequest(sMethod, oForm.getAttribute("action"),
                        this.callback);

                    this.asyncSubmitEvent.fire();

                    break;

                case "form":

                    oForm.submit();
                    this.formSubmitEvent.fire();

                    break;

                case "none":
                case "manual":

                    this.manualSubmitEvent.fire();

                    break;

                }

            },

            /**
            * Prepares the Dialog's internal FORM object, creating one if one is
            * not currently present.
            * @method registerForm
            */
            registerForm: function () {

                var form = this.element.getElementsByTagName("form")[0],
                    me = this,
                    firstElement,
                    lastElement;

                if (this.form) {
                    if (this.form == form &&
                        Dom.isAncestor(this.element, this.form)) {

                        return;
                    } else {
                        Event.purgeElement(this.form);
                        this.form = null;
                    }
                }

                if (!form) {
                    form = document.createElement("form");
                    form.name = "frm_" + this.id;

                    this.body.appendChild(form);
                }

                if (form) {
                    this.form = form;

                    Event.on(form, "submit", function (e) {
                        Event.stopEvent(e);
                        this.submit();
                        this.form.blur();
                    }, this, true);

                    this.firstFormElement = function () {
                        var f, el, nElements = form.elements.length;

                        for (f = 0; f < nElements; f++) {
                            el = form.elements[f];
                            if (el.focus && !el.disabled && el.type != "hidden") {
                                return el;
                            }
                        }
                        return null;
                    }();

                    this.lastFormElement = function () {
                        var f, el, nElements = form.elements.length;

                        for (f = nElements - 1; f >= 0; f--) {
                            el = form.elements[f];
                            if (el.focus && !el.disabled && el.type != "hidden") {
                                return el;
                            }
                        }
                        return null;
                    }();

                    if (this.cfg.getProperty("modal")) {
                        firstElement = this.firstFormElement || this.firstButton;
                        if (firstElement) {
                            this.preventBackTab = new KeyListener(firstElement,
                                { shift: true, keys: 9 },
                                { fn: me.focusLast, scope: me,
                                correctScope: true });

                            this.showEvent.subscribe(this.preventBackTab.enable,
                                this.preventBackTab, true);

                            this.hideEvent.subscribe(this.preventBackTab.disable,
                                this.preventBackTab, true);
                        }

                        lastElement = this.lastButton || this.lastFormElement;

                        if (lastElement) {
                            this.preventTabOut = new KeyListener(lastElement,
                                { shift: false, keys: 9 },
                                { fn: me.focusFirst, scope: me,
                                correctScope: true });

                            this.showEvent.subscribe(this.preventTabOut.enable,
                                this.preventTabOut, true);

                            this.hideEvent.subscribe(this.preventTabOut.disable,
                                this.preventTabOut, true);
                        }
                    }
                }
            },

            // BEGIN BUILT-IN PROPERTY EVENT HANDLERS //

            /**
            * The default event handler fired when the "close" property is
            * changed. The method controls the appending or hiding of the close
            * icon at the top right of the Dialog.
            * @method configClose
            * @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.
            */
            configClose: function (type, args, obj) {
                var val = args[0];

                function doCancel(e, obj) {
                    obj.cancel();
                }

                if (val) {
                    if (! this.close) {
                        this.close = document.createElement("div");
                        Dom.addClass(this.close, "container-close");

                        this.close.innerHTML = "&#160;";
                        this.innerElement.appendChild(this.close);
                        Event.on(this.close, "click", doCancel, this);
                    } else {
                        this.close.style.display = "block";
                    }
                } else {
                    if (this.close) {
                        this.close.style.display = "none";
                    }
                }
            },

            /**
            * The default event handler for the "buttons" configuration property
            * @method configButtons
            * @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.
            */
            configButtons: function (type, args, obj) {

                var Button = YAHOO.widget.Button,
                    aButtons = args[0],
                    oInnerElement = this.innerElement,
                    oButton,
                    oButtonEl,
                    oYUIButton,
                    nButtons,
                    oSpan,
                    oFooter,
                    i;

                removeButtonEventHandlers.call(this);

                this._aButtons = null;

                if (Lang.isArray(aButtons)) {

                    oSpan = document.createElement("span");
                    oSpan.className = "button-group";

                    nButtons = aButtons.length;

                    this._aButtons = [];

                    for (i = 0; i < nButtons; i++) {

                        oButton = aButtons[i];

                        if (Button) {

                            oYUIButton = new Button({ label: oButton.text,
                                                container: oSpan });

                            oButtonEl = oYUIButton.get("element");

                            if (oButton.isDefault) {

                                oYUIButton.addClass("default");

                                this.defaultHtmlButton = oButtonEl;

                            }

                            if (Lang.isFunction(oButton.handler)) {

                                oYUIButton.set("onclick", { fn: oButton.handler,
                                    obj: this, scope: this });

                            }
                            else if (Lang.isObject(oButton.handler) &&
                                Lang.isFunction(oButton.handler.fn)) {

                                oYUIButton.set("onclick", { fn: oButton.handler.fn,
                                    obj: ((!Lang.isUndefined(oButton.handler.obj)) ?
                                    oButton.handler.obj : this),
                                    scope: (oButton.handler.scope || this) });

                            }

                            this._aButtons[this._aButtons.length] = oYUIButton;

                        }
                        else {

                            oButtonEl = document.createElement("button");
                            oButtonEl.setAttribute("type", "button");

                            if (oButton.isDefault) {
                                oButtonEl.className = "default";
                                this.defaultHtmlButton = oButtonEl;
                            }

                            oButtonEl.innerHTML = oButton.text;

                            if (Lang.isFunction(oButton.handler)) {

                                Event.on(oButtonEl, "click", oButton.handler,
                                    this, true);

                            }
                            else if (Lang.isObject(oButton.handler) &&
                                Lang.isFunction(oButton.handler.fn)) {

                                Event.on(oButtonEl, "click", oButton.handler.fn,
                                    ((!Lang.isUndefined(oButton.handler.obj)) ?
                                    oButton.handler.obj : this),
                                    (oButton.handler.scope || this));

                            }

                            oSpan.appendChild(oButtonEl);

                            this._aButtons[this._aButtons.length] = oButtonEl;

                        }

                        oButton.htmlButton = oButtonEl;

                        if (i === 0) {
                            this.firstButton = oButtonEl;
                        }

                        if (i == (nButtons - 1)) {
                            this.lastButton = oButtonEl;
                        }

                    }

                    this.setFooter(oSpan);

                    oFooter = this.footer;

                    if (Dom.inDocument(this.element) &&
                        !Dom.isAncestor(oInnerElement, oFooter)) {

                        oInnerElement.appendChild(oFooter);

                    }

                    this.buttonSpan = oSpan;

                } else { // Do cleanup

                    oSpan = this.buttonSpan;
                    oFooter = this.footer;

                    if (oSpan && oFooter) {

                        oFooter.removeChild(oSpan);

                        this.buttonSpan = null;
                        this.firstButton = null;
                        this.lastButton = null;
                        this.defaultHtmlButton = null;

                    }

                }

                this.cfg.refireEvent("iframe");
                this.cfg.refireEvent("underlay");

            },

            /**
            * @method getButtons
            * @description Returns an array containing each of the Dialog's
            * buttons, by default an array of HTML <code>&#60;BUTTON&#60;</code>
            * elements.  If the Dialog's buttons were created using the
            * YAHOO.widget.Button class (via the inclusion of the optional Button
            * dependancy on the page), an array of YAHOO.widget.Button instances
            * is returned.
            * @return {Array}
            */
            getButtons: function () {

                var aButtons = this._aButtons;

                if (aButtons) {

                    return aButtons;

                }

            },

            /**
            * Sets focus to the first element in the Dialog's form or the first
            * button defined via the "buttons" configuration property. Called
            * when the Dialog is made visible.
            * @method focusFirst
            */
            focusFirst: function (type, args, obj) {

                var oElement = this.firstFormElement,
                    oEvent;

                if (args) {

                    oEvent = args[1];

                    if (oEvent) {

                        Event.stopEvent(oEvent);

                    }

                }

                if (oElement) {

                    /*
                        Place the call to the "focus" method inside a try/catch
                        block to prevent IE from throwing JavaScript errors if
                        the element is disabled or hidden.
                    */

                    try {

                        oElement.focus();

                    }
                    catch(oException) {

                    }

                } else {

                    this.focusDefaultButton();

                }

            },

            /**
            * Sets focus to the last element in the Dialog's form or the last
            * button defined via the "buttons" configuration property.
            * @method focusLast
            */
            focusLast: function (type, args, obj) {

                var aButtons = this.cfg.getProperty("buttons"),
                    oElement = this.lastFormElement,
                    oEvent;

                if (args) {

                    oEvent = args[1];

                    if (oEvent) {

                        Event.stopEvent(oEvent);

                    }

                }

                if (aButtons && Lang.isArray(aButtons)) {

                    this.focusLastButton();

                } else {

                    if (oElement) {

                        /*
                            Place the call to the "focus" method inside a try/catch
                            block to prevent IE from throwing JavaScript errors if
                            the element is disabled or hidden.
                        */

                        try {

                            oElement.focus();

                        }
                        catch(oException) {

                        }

                    }

                }

            },

            /**
            * Sets the focus to the button that is designated as the default via
            * the "buttons" configuration property. By default, this method is
            * called when the Dialog is made visible.
            * @method focusDefaultButton
            */
            focusDefaultButton: function () {

                var oElement = this.defaultHtmlButton;

                if (oElement) {

                    /*
                        Place the call to the "focus" method inside a try/catch
                        block to prevent IE from throwing JavaScript errors if
                        the element is disabled or hidden.
                    */

                    try {

                        oElement.focus();

                    }
                    catch(oException) {

                    }

                }
            },

            /**
            * Blurs all the buttons defined via the "buttons"
            * configuration property.
            * @method blurButtons
            */
            blurButtons: function () {

                var aButtons = this.cfg.getProperty("buttons"),
                    nButtons,
                    oButton,
                    oElement,
                    i;

                if (aButtons && Lang.isArray(aButtons)) {

                    nButtons = aButtons.length;

                    if (nButtons > 0) {

                        i = (nButtons - 1);

                        do {

                            oButton = aButtons[i];

                            if (oButton) {

                                oElement = oButton.htmlButton;

                                if (oElement) {

                                    /*
                                        Place the call to the "blur" method inside
                                        a try/catch block to prevent IE from
                                        throwing JavaScript errors if the element
                                        is disabled or hidden.
                                    */

                                    try {

                                        oElement.blur();

                                    }
                                    catch(oException) {

                                    }

                                }

                            }

                        }
                        while(i--);

                    }

                }

            },

            /**
            * Sets the focus to the first button created via the "buttons"
            * configuration property.
            * @method focusFirstButton
            */
            focusFirstButton: function () {

                var aButtons = this.cfg.getProperty("buttons"),
                    oButton,
                    oElement;

                if (aButtons && Lang.isArray(aButtons)) {

                    oButton = aButtons[0];

                    if (oButton) {

                        oElement = oButton.htmlButton;

                        if (oElement) {

                            /*
                                Place the call to the "focus" method inside a
                                try/catch block to prevent IE from throwing
                                JavaScript errors if the element is disabled
                                or hidden.
                            */

                            try {

                                oElement.focus();

                            }
                            catch(oException) {

                            }

                        }

                    }

                }
            },

            /**
            * Sets the focus to the last button created via the "buttons"
            * configuration property.
            * @method focusLastButton
            */
            focusLastButton: function () {

                var aButtons = this.cfg.getProperty("buttons"),
                    nButtons,
                    oButton,
                    oElement;

                if (aButtons && Lang.isArray(aButtons)) {

                    nButtons = aButtons.length;

                    if (nButtons > 0) {

                        oButton = aButtons[(nButtons - 1)];

                        if (oButton) {

                            oElement = oButton.htmlButton;

                            if (oElement) {

                                /*
                                    Place the call to the "focus" method inside a
                                    try/catch block to prevent IE from throwing
                                    JavaScript errors if the element is disabled
                                    or hidden.
                                */

                                try {

                                    oElement.focus();

                                }
                                catch(oException) {

                                }

                            }

                        }

                    }

                }

            },

            /**
            * The default event handler for the "postmethod" configuration property
            * @method configPostMethod
            * @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.
            */
            configPostMethod: function (type, args, obj) {
                this.registerForm();
            },

            // END BUILT-IN PROPERTY EVENT HANDLERS //

            /**
            * Built-in function hook for writing a validation function that will
            * be checked for a "true" value prior to a submit. This function, as
            * implemented by default, always returns true, so it should be
            * overridden if validation is necessary.
            * @method validate
            */
            validate: function () {
                return true;
            },

            /**
            * Executes a submit of the Dialog followed by a hide, if validation
            * is successful.
            * @method submit
            */
            submit: function () {
                if (this.validate()) {
                    this.beforeSubmitEvent.fire();
                    this.doSubmit();
                    this.submitEvent.fire();
                    this.hide();
                    return true;
                } else {
                    return false;
                }
            },

            /**
            * Executes the cancel of the Dialog followed by a hide.
            * @method cancel
            */
            cancel: function () {
                this.cancelEvent.fire();
                this.hide();
            },

            /**
            * Returns a JSON-compatible data structure representing the data
            * currently contained in the form.
            * @method getData
            * @return {Object} A JSON object reprsenting the data of the
            * current form.
            */
            getData: function () {

                var oForm = this.form,
                    aElements,
                    nTotalElements,
                    oData,
                    sName,
                    oElement,
                    nElements,
                    sType,
                    sTagName,
                    aOptions,
                    nOptions,
                    aValues,
                    oOption,
                    sValue,
                    oRadio,
                    oCheckbox,
                    i,
                    n;

                function isFormElement(p_oElement) {

                    var sTag = p_oElement.tagName.toUpperCase();

                    return ((sTag == "INPUT" || sTag == "TEXTAREA" ||
                            sTag == "SELECT") && p_oElement.name == sName);

                }

                if (oForm) {

                    aElements = oForm.elements;
                    nTotalElements = aElements.length;
                    oData = {};

                    for (i = 0; i < nTotalElements; i++) {

                        sName = aElements[i].name;

                        /*
                            Using "Dom.getElementsBy" to safeguard user from JS
                            errors that result from giving a form field (or set of
                            fields) the same name as a native method of a form
                            (like "submit") or a DOM collection (such as the "item"
                            method). Originally tried accessing fields via the
                            "namedItem" method of the "element" collection, but
                            discovered that it won't return a collection of fields
                            in Gecko.
                        */

                        oElement = Dom.getElementsBy(isFormElement, "*", oForm);
                        nElements = oElement.length;

                        if (nElements > 0) {

                            if (nElements == 1) {

                                oElement = oElement[0];

                                sType = oElement.type;
                                sTagName = oElement.tagName.toUpperCase();

                                switch (sTagName) {

                                case "INPUT":

                                    if (sType == "checkbox") {

                                        oData[sName] = oElement.checked;

                                    }
                                    else if (sType != "radio") {

                                        oData[sName] = oElement.value;

                                    }

                                    break;

                                case "TEXTAREA":

                                    oData[sName] = oElement.value;

                                    break;

                                case "SELECT":

                                    aOptions = oElement.options;
                                    nOptions = aOptions.length;
                                    aValues = [];

                                    for (n = 0; n < nOptions; n++) {

                                        oOption = aOptions[n];

                                        if (oOption.selected) {

                                            sValue = oOption.value;

                                            if (!sValue || sValue === "") {

                                                sValue = oOption.text;

                                            }

                                            aValues[aValues.length] = sValue;

                                        }

                                    }

                                    oData[sName] = aValues;

                                    break;

                                }

                            }
                            else {

                                sType = oElement[0].type;

                                switch (sType) {

                                case "radio":

                                    for (n = 0; n < nElements; n++) {

                                        oRadio = oElement[n];

                                        if (oRadio.checked) {

                                            oData[sName] = oRadio.value;
                                            break;

                                        }

                                    }

                                    break;

                                case "checkbox":

                                    aValues = [];

                                    for (n = 0; n < nElements; n++) {

                                        oCheckbox = oElement[n];

                                        if (oCheckbox.checked) {

                                            aValues[aValues.length] =
                                                oCheckbox.value;

                                        }

                                    }

                                    oData[sName] = aValues;

                                    break;

                                }

                            }

                        }

                    }

                }

                return oData;

            },

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

                removeButtonEventHandlers.call(this);

                this._aButtons = null;

                var aForms = this.element.getElementsByTagName("form"),
                    oForm;

                if (aForms.length > 0) {

                    oForm = aForms[0];

                    if (oForm) {
                        Event.purgeElement(oForm);
                        if (oForm.parentNode) {
                            oForm.parentNode.removeChild(oForm);
                        }
                        this.form = null;
                    }
                }

                Dialog.superclass.destroy.call(this);

            },

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

        });

    }());

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