    /**
     * @class Ext.form.BasicForm
     * @extends Ext.util.Observable
     * Encapsulates the DOM <form> element at the heart of the {@link Ext.form.FormPanel FormPanel} class, and provides
     * input field management, validation, submission, and form loading services.
     * By default, Ext Forms are submitted through Ajax, using an instance of {@link Ext.form.Action.Submit}.
     * To enable normal browser submission of an Ext Form, use the {@link #standardSubmit} config option.
     * File Uploads
     * {@link #fileUpload File uploads} are not performed using Ajax submission, that
     * is they are not performed using XMLHttpRequests. Instead the form is submitted in the standard
     * manner with the DOM <form> element temporarily modified to have its
     * target set to refer
     * to a dynamically generated, hidden <iframe> which is inserted into the document
     * but removed after the return data has been gathered.
     * The server response is parsed by the browser to create the document for the IFRAME. If the
     * server is using JSON to send the return object, then the
     * Content-Type header
     * must be set to "text/html" in order to tell the browser to insert the text unchanged into the document body.
     * Characters which are significant to an HTML parser must be sent as HTML entities, so encode
     * "<" as "&lt;", "&" as "&amp;" etc.
     * The response text is retrieved from the document, and a fake XMLHttpRequest object
     * is created containing a responseText property in order to conform to the
     * requirements of event handlers and callbacks.
     * Be aware that file upload packets are sent with the content type multipart/form
     * and some server technologies (notably JEE) may require some custom processing in order to
     * retrieve parameter names and parameter values from the packet content.
     * @constructor
     * @param {Mixed} el The form element or its id
     * @param {Object} config Configuration options
     */
    Ext.form.BasicForm = function(el, config){
        Ext.apply(this, config);
        if(Ext.isString(this.paramOrder)){
            this.paramOrder = this.paramOrder.split(/[\s,|]/);
        }
        /**
         * A {@link Ext.util.MixedCollection MixedCollection} containing all the Ext.form.Fields in this form.
         * @type MixedCollection
         * @property items
         */
        this.items = new Ext.util.MixedCollection(false, function(o){
            return o.getItemId();
        });
        this.addEvents(
            /**
             * @event beforeaction
             * Fires before any action is performed. Return false to cancel the action.
             * @param {Form} this
             * @param {Action} action The {@link Ext.form.Action} to be performed
             */
            'beforeaction',
            /**
             * @event actionfailed
             * Fires when an action fails.
             * @param {Form} this
             * @param {Action} action The {@link Ext.form.Action} that failed
             */
            'actionfailed',
            /**
             * @event actioncomplete
             * Fires when an action is completed.
             * @param {Form} this
             * @param {Action} action The {@link Ext.form.Action} that completed
             */
            'actioncomplete'
        );

        if(el){
            this.initEl(el);
        }
        Ext.form.BasicForm.superclass.constructor.call(this);
    };

    Ext.extend(Ext.form.BasicForm, Ext.util.Observable, {
        /**
         * @cfg {String} method
         * The request method to use (GET or POST) for form actions if one isn't supplied in the action options.
         */
        /**
         * @cfg {DataReader} reader
         * An Ext.data.DataReader (e.g. {@link Ext.data.XmlReader}) to be used to read
         * data when executing 'load' actions. This is optional as there is built-in
         * support for processing JSON.  For additional information on using an XMLReader
         * see the example provided in examples/form/xml-form.html.
         */
        /**
         * @cfg {DataReader} errorReader
         * An Ext.data.DataReader (e.g. {@link Ext.data.XmlReader}) to be used to
         * read field error messages returned from 'submit' actions. This is optional
         * as there is built-in support for processing JSON.
         * The Records which provide messages for the invalid Fields must use the
         * Field name (or id) as the Record ID, and must contain a field called 'msg'
         * which contains the error message.
         * The errorReader does not have to be a full-blown implementation of a
         * DataReader. It simply needs to implement a read(xhr) function
         * which returns an Array of Records in an object with the following
         * structure:
    {
        records: recordArray
    }

         */
        /**
         * @cfg {String} url
         * The URL to use for form actions if one isn't supplied in the
         * {@link #doAction doAction} options.
         */
        /**
         * @cfg {Boolean} fileUpload
         * Set to true if this form is a file upload.
         * File uploads are not performed using normal 'Ajax' techniques, that is they are not
         * performed using XMLHttpRequests. Instead the form is submitted in the standard manner with the
         * DOM <form> element temporarily modified to have its
         * target set to refer
         * to a dynamically generated, hidden <iframe> which is inserted into the document
         * but removed after the return data has been gathered.
         * The server response is parsed by the browser to create the document for the IFRAME. If the
         * server is using JSON to send the return object, then the
         * Content-Type header
         * must be set to "text/html" in order to tell the browser to insert the text unchanged into the document body.
         * Characters which are significant to an HTML parser must be sent as HTML entities, so encode
         * "<" as "&lt;", "&" as "&amp;" etc.
         * The response text is retrieved from the document, and a fake XMLHttpRequest object
         * is created containing a responseText property in order to conform to the
         * requirements of event handlers and callbacks.
         * Be aware that file upload packets are sent with the content type multipart/form
         * and some server technologies (notably JEE) may require some custom processing in order to
         * retrieve parameter names and parameter values from the packet content.
         */
        /**
         * @cfg {Object} baseParams
         * Parameters to pass with all requests. e.g. baseParams: {id: '123', foo: 'bar'}.
         * Parameters are encoded as standard HTTP parameters using {@link Ext#urlEncode}.
         */
        /**
         * @cfg {Number} timeout Timeout for form actions in seconds (default is 30 seconds).
         */
        timeout: 30,

        /**
         * @cfg {Object} api (Optional) If specified load and submit actions will be handled
         * with {@link Ext.form.Action.DirectLoad} and {@link Ext.form.Action.DirectSubmit}.
         * Methods which have been imported by Ext.Direct can be specified here to load and submit
         * forms.
         * Such as the following:
    api: {
        load: App.ss.MyProfile.load,
        submit: App.ss.MyProfile.submit
    }

         * Load actions can use {@link #paramOrder} or {@link #paramsAsHash}
         * to customize how the load method is invoked.
         * Submit actions will always use a standard form submit. The formHandler configuration must
         * be set on the associated server-side method which has been imported by Ext.Direct
         */

        /**
         * @cfg {Array/String} paramOrder A list of params to be executed server side.
         * Defaults to undefined. Only used for the {@link #api}
         * load configuration.
         *
    Specify the params in the order in which they must be executed on the
         * server-side as either (1) an Array of String values, or (2) a String of params
         * delimited by either whitespace, comma, or pipe. For example,
         * any of the following would be acceptable:
    paramOrder: ['param1','param2','param3']
    paramOrder: 'param1 param2 param3'
    paramOrder: 'param1,param2,param3'
    paramOrder: 'param1|param2|param'

         */
        paramOrder: undefined,

        /**
         * @cfg {Boolean} paramsAsHash Only used for the {@link #api}
         * load configuration. Send parameters as a collection of named
         * arguments (defaults to false). Providing a
         * {@link #paramOrder} nullifies this configuration.
         */
        paramsAsHash: false,

        /**
         * @cfg {String} waitTitle
         * The default title to show for the waiting message box (defaults to 'Please Wait...')
         */
        waitTitle: 'Please Wait...',

        // private
        activeAction : null,

        /**
         * @cfg {Boolean} trackResetOnLoad If set to true, {@link #reset}() resets to the last loaded
         * or {@link #setValues}() data instead of when the form was first created.  Defaults to false.
         */
        trackResetOnLoad : false,

        /**
         * @cfg {Boolean} standardSubmit
         * If set to true, standard HTML form submits are used instead
         * of XHR (Ajax) style form submissions. Defaults to false.
         *
    Note: When using standardSubmit, the
         * options to {@link #submit} are ignored because
         * Ext's Ajax infrastracture is bypassed. To pass extra parameters (e.g.
         * baseParams and params), utilize hidden fields
         * to submit extra data, for example:
         *
    new Ext.FormPanel({
        standardSubmit: true,
        baseParams: {
            foo: 'bar'
        },
        {@link url}: 'myProcess.php',
        items: [{
            xtype: 'textfield',
            name: 'userName'
        }],
        buttons: [{
            text: 'Save',
            handler: function(){
                var fp = this.ownerCt.ownerCt,
                    form = fp.getForm();
                if (form.isValid()) {
                    // check if there are baseParams and if
                    // hiddent items have been added already
                    if (fp.baseParams && !fp.paramsAdded) {
                        // add hidden items for all baseParams
                        for (i in fp.baseParams) {
                            fp.add({
                                xtype: 'hidden',
                                name: i,
                                value: fp.baseParams[i]
                            });
                        }
                        fp.doLayout();
                        // set a custom flag to prevent re-adding
                        fp.paramsAdded = true;
                    }
                    form.{@link #submit}();
                }
            }
        }]
    });
         *
         */
        /**
         * By default wait messages are displayed with Ext.MessageBox.wait. You can target a specific
         * element by passing it or its id or mask the form itself by passing in true.
         * @type Mixed
         * @property waitMsgTarget
         */

        // private
        initEl : function(el){
            this.el = Ext.get(el);
            this.id = this.el.id || Ext.id();
            if(!this.standardSubmit){
                this.el.on('submit', this.onSubmit, this);
            }
            this.el.addClass('x-form');
        },

        /**
         * Get the HTML form Element
         * @return Ext.Element
         */
        getEl: function(){
            return this.el;
        },

        // private
        onSubmit : function(e){
            e.stopEvent();
        },

        // private
        destroy: function() {
            this.items.each(function(f){
                Ext.destroy(f);
            });
            if(this.el){
                this.el.removeAllListeners();
                this.el.remove();
            }
            this.purgeListeners();
        },

        /**
         * Returns true if client-side validation on the form is successful.
         * @return Boolean
         */
        isValid : function(){
            var valid = true;
            this.items.each(function(f){
               if(!f.validate()){
                   valid = false;
               }
            });
            return valid;
        },

        /**
         * Returns true if any fields in this form have changed from their original values.
         * Note that if this BasicForm was configured with {@link #trackResetOnLoad} then the
         * Fields' original values are updated when the values are loaded by {@link #setValues}
         * or {@link #loadRecord}.
         * @return Boolean
         */
        isDirty : function(){
            var dirty = false;
            this.items.each(function(f){
               if(f.isDirty()){
                   dirty = true;
                   return false;
               }
            });
            return dirty;
        },

        /**
         * Performs a predefined action ({@link Ext.form.Action.Submit} or
         * {@link Ext.form.Action.Load}) or a custom extension of {@link Ext.form.Action}
         * to perform application-specific processing.
         * @param {String/Object} actionName The name of the predefined action type,
         * or instance of {@link Ext.form.Action} to perform.
         * @param {Object} options (optional) The options to pass to the {@link Ext.form.Action}.
         * All of the config options listed below are supported by both the
         * {@link Ext.form.Action.Submit submit} and {@link Ext.form.Action.Load load}
         * actions unless otherwise noted (custom actions could also accept
         * other config options):
         *
         * url : StringThe url for the action (defaults
         * to the form's {@link #url}.)
         *
         * method : StringThe form method to use (defaults
         * to the form's method, or POST if not defined)
         *
         * params : String/ObjectThe params to pass
         * (defaults to the form's baseParams, or none if not defined)
         * Parameters are encoded as standard HTTP parameters using {@link Ext#urlEncode}.
         *
         * headers : ObjectRequest headers to set for the action
         * (defaults to the form's default headers)
         *
         * success : FunctionThe callback that will
         * be invoked after a successful response (see top of
         * {@link Ext.form.Action.Submit submit} and {@link Ext.form.Action.Load load}
         * for a description of what constitutes a successful response).
         * The function is passed the following parameters:
         * form : Ext.form.BasicFormThe form that requested the action
         * action : The {@link Ext.form.Action Action} object which performed the operation.
         * The action object contains these properties of interest:
         * {@link Ext.form.Action#response response}
         * {@link Ext.form.Action#result result} : interrogate for custom postprocessing
         * {@link Ext.form.Action#type type}
         *
         *
         * failure : FunctionThe callback that will be invoked after a
         * failed transaction attempt. The function is passed the following parameters:
         * form : The {@link Ext.form.BasicForm} that requested the action.
         * action : The {@link Ext.form.Action Action} object which performed the operation.
         * The action object contains these properties of interest:
         * {@link Ext.form.Action#failureType failureType}
         * {@link Ext.form.Action#response response}
         * {@link Ext.form.Action#result result} : interrogate for custom postprocessing
         * {@link Ext.form.Action#type type}
         *
         *
         * scope : ObjectThe scope in which to call the
         * callback functions (The this reference for the callback functions).
         *
         * clientValidation : BooleanSubmit Action only.
         * Determines whether a Form's fields are validated in a final call to
         * {@link Ext.form.BasicForm#isValid isValid} prior to submission. Set to false
         * to prevent this. If undefined, pre-submission field validation is performed.
         *
         * @return {BasicForm} this
         */
        doAction : function(action, options){
            if(Ext.isString(action)){
                action = new Ext.form.Action.ACTION_TYPES[action](this, options);
            }
            if(this.fireEvent('beforeaction', this, action) !== false){
                this.beforeAction(action);
                action.run.defer(100, action);
            }
            return this;
        },

        /**
         * Shortcut to {@link #doAction do} a {@link Ext.form.Action.Submit submit action}.
         * @param {Object} options The options to pass to the action (see {@link #doAction} for details).

         * Note: this is ignored when using the {@link #standardSubmit} option.
         * The following code:
    myFormPanel.getForm().submit({
        clientValidation: true,
        url: 'updateConsignment.php',
        params: {
            newStatus: 'delivered'
        },
        success: function(form, action) {
           Ext.Msg.alert('Success', action.result.msg);
        },
        failure: function(form, action) {
            switch (action.failureType) {
                case Ext.form.Action.CLIENT_INVALID:
                    Ext.Msg.alert('Failure', 'Form fields may not be submitted with invalid values');
                    break;
                case Ext.form.Action.CONNECT_FAILURE:
                    Ext.Msg.alert('Failure', 'Ajax communication failed');
                    break;
                case Ext.form.Action.SERVER_INVALID:
                   Ext.Msg.alert('Failure', action.result.msg);
           }
        }
    });

         * would process the following server response for a successful submission:
    {
        "success":true, // note this is Boolean, not string
        "msg":"Consignment updated"
    }

         * and the following server response for a failed submission:
    {
        "success":false, // note this is Boolean, not string
        "msg":"You do not have permission to perform this operation"
    }

         * @return {BasicForm} this
         */
        submit : function(options){
            if(this.standardSubmit){
                var v = this.isValid();
                if(v){
                    var el = this.el.dom;
                    if(this.url && Ext.isEmpty(el.action)){
                        el.action = this.url;
                    }
                    el.submit();
                }
                return v;
            }
            var submitAction = String.format('{0}submit', this.api ? 'direct' : '');
            this.doAction(submitAction, options);
            return this;
        },

        /**
         * Shortcut to {@link #doAction do} a {@link Ext.form.Action.Load load action}.
         * @param {Object} options The options to pass to the action (see {@link #doAction} for details)
         * @return {BasicForm} this
         */
        load : function(options){
            var loadAction = String.format('{0}load', this.api ? 'direct' : '');
            this.doAction(loadAction, options);
            return this;
        },

        /**
         * Persists the values in this form into the passed {@link Ext.data.Record} object in a beginEdit/endEdit block.
         * @param {Record} record The record to edit
         * @return {BasicForm} this
         */
        updateRecord : function(record){
            record.beginEdit();
            var fs = record.fields;
            fs.each(function(f){
                var field = this.findField(f.name);
                if(field){
                    record.set(f.name, field.getValue());
                }
            }, this);
            record.endEdit();
            return this;
        },

        /**
         * Loads an {@link Ext.data.Record} into this form by calling {@link #setValues} with the
         * {@link Ext.data.Record#data record data}.
         * See also {@link #trackResetOnLoad}.
         * @param {Record} record The record to load
         * @return {BasicForm} this
         */
        loadRecord : function(record){
            this.setValues(record.data);
            return this;
        },

        // private
        beforeAction : function(action){
            var o = action.options;
            if(o.waitMsg){
                if(this.waitMsgTarget === true){
                    this.el.mask(o.waitMsg, 'x-mask-loading');
                }else if(this.waitMsgTarget){
                    this.waitMsgTarget = Ext.get(this.waitMsgTarget);
                    this.waitMsgTarget.mask(o.waitMsg, 'x-mask-loading');
                }else{
                    Ext.MessageBox.wait(o.waitMsg, o.waitTitle || this.waitTitle);
                }
            }
        },

        // private
        afterAction : function(action, success){
            this.activeAction = null;
            var o = action.options;
            if(o.waitMsg){
                if(this.waitMsgTarget === true){
                    this.el.unmask();
                }else if(this.waitMsgTarget){
                    this.waitMsgTarget.unmask();
                }else{
                    Ext.MessageBox.updateProgress(1);
                    Ext.MessageBox.hide();
                }
            }
            if(success){
                if(o.reset){
                    this.reset();
                }
                Ext.callback(o.success, o.scope, [this, action]);
                this.fireEvent('actioncomplete', this, action);
            }else{
                Ext.callback(o.failure, o.scope, [this, action]);
                this.fireEvent('actionfailed', this, action);
            }
        },

        /**
         * Find a {@link Ext.form.Field} in this form.
         * @param {String} id The value to search for (specify either a {@link Ext.Component#id id},
         * {@link Ext.grid.Column#dataIndex dataIndex}, {@link Ext.form.Field#getName name or hiddenName}).
         * @return Field
         */
        findField : function(id){
            var field = this.items.get(id);
            if(!Ext.isObject(field)){
                this.items.each(function(f){
                    if(f.isFormField && (f.dataIndex == id || f.id == id || f.getName() == id)){
                        field = f;
                        return false;
                    }
                });
            }
            return field || null;
        },

        /**
         * Mark fields in this form invalid in bulk.
         * @param {Array/Object} errors Either an array in the form [{id:'fieldId', msg:'The message'},...] or an object hash of {id: msg, id2: msg2}
         * @return {BasicForm} this
         */
        markInvalid : function(errors){
            if(Ext.isArray(errors)){
                for(var i = 0, len = errors.length; i < len; i++){
                    var fieldError = errors[i];
                    var f = this.findField(fieldError.id);
                    if(f){
                        f.markInvalid(fieldError.msg);
                    }
                }
            }else{
                var field, id;
                for(id in errors){
                    if(!Ext.isFunction(errors[id]) && (field = this.findField(id))){
                        field.markInvalid(errors[id]);
                    }
                }
            }
            return this;
        },

        /**
         * Set values for fields in this form in bulk.
         * @param {Array/Object} values Either an array in the form:
    [{id:'clientName', value:'Fred. Olsen Lines'},
     {id:'portOfLoading', value:'FXT'},
     {id:'portOfDischarge', value:'OSL'} ]
         * or an object hash of the form:
    {
        clientName: 'Fred. Olsen Lines',
        portOfLoading: 'FXT',
        portOfDischarge: 'OSL'
    }
         * @return {BasicForm} this
         */
        setValues : function(values){
            if(Ext.isArray(values)){ // array of objects
                for(var i = 0, len = values.length; i < len; i++){
                    var v = values[i];
                    var f = this.findField(v.id);
                    if(f){
                        f.setValue(v.value);
                        if(this.trackResetOnLoad){
                            f.originalValue = f.getValue();
                        }
                    }
                }
            }else{ // object hash
                var field, id;
                for(id in values){
                    if(!Ext.isFunction(values[id]) && (field = this.findField(id))){
                        field.setValue(values[id]);
                        if(this.trackResetOnLoad){
                            field.originalValue = field.getValue();
                        }
                    }
                }
            }
            return this;
        },

        /**
         * Returns the fields in this form as an object with key/value pairs as they would be submitted using a standard form submit.
         * If multiple fields exist with the same name they are returned as an array.
         * Note: The values are collected from all enabled HTML input elements within the form, not from
         * the Ext Field objects. This means that all returned values are Strings (or Arrays of Strings) and that the
         * value can potentially be the emptyText of a field.
         * @param {Boolean} asString (optional) Pass true to return the values as a string. (defaults to false, returning an Object)
         * @return {String/Object}
         */
        getValues : function(asString){
            var fs = Ext.lib.Ajax.serializeForm(this.el.dom);
            if(asString === true){
                return fs;
            }
            return Ext.urlDecode(fs);
        },

        /**
         * Retrieves the fields in the form as a set of key/value pairs, using the {@link Ext.form.Field#getValue getValue()} method.
         * If multiple fields exist with the same name they are returned as an array.
         * @param {Boolean} dirtyOnly (optional) True to return only fields that are dirty.
         * @return {Object} The values in the form
         */
        getFieldValues : function(dirtyOnly){
            var o = {},
                n,
                key,
                val;
            this.items.each(function(f){
                if(dirtyOnly !== true || f.isDirty()){
                    n = f.getName();
                    key = o[n];
                    val = f.getValue();

                    if(Ext.isDefined(key)){
                        if(Ext.isArray(key)){
                            o[n].push(val);
                        }else{
                            o[n] = [key, val];
                        }
                    }else{
                        o[n] = val;
                    }
                }
            });
            return o;
        },

        /**
         * Clears all invalid messages in this form.
         * @return {BasicForm} this
         */
        clearInvalid : function(){
            this.items.each(function(f){
               f.clearInvalid();
            });
            return this;
        },

        /**
         * Resets this form.
         * @return {BasicForm} this
         */
        reset : function(){
            this.items.each(function(f){
                f.reset();
            });
            return this;
        },

        /**
         * Add Ext.form Components to this form's Collection. This does not result in rendering of
         * the passed Component, it just enables the form to validate Fields, and distribute values to
         * Fields.
         * You will not usually call this function. In order to be rendered, a Field must be added
         * to a {@link Ext.Container Container}, usually an {@link Ext.form.FormPanel FormPanel}.
         * The FormPanel to which the field is added takes care of adding the Field to the BasicForm's
         * collection.
         * @param {Field} field1
         * @param {Field} field2 (optional)
         * @param {Field} etc (optional)
         * @return {BasicForm} this
         */
        add : function(){
            this.items.addAll(Array.prototype.slice.call(arguments, 0));
            return this;
        },

        /**
         * Removes a field from the items collection (does NOT remove its markup).
         * @param {Field} field
         * @return {BasicForm} this
         */
        remove : function(field){
            this.items.remove(field);
            return this;
        },

        /**
         * Iterates through the {@link Ext.form.Field Field}s which have been {@link #add add}ed to this BasicForm,
         * checks them for an id attribute, and calls {@link Ext.form.Field#applyToMarkup} on the existing dom element with that id.
         * @return {BasicForm} this
         */
        render : function(){
            this.items.each(function(f){
                if(f.isFormField && !f.rendered && document.getElementById(f.id)){ // if the element exists
                    f.applyToMarkup(f.id);
                }
            });
            return this;
        },

        /**
         * Calls {@link Ext#apply} for all fields in this form with the passed object.
         * @param {Object} values
         * @return {BasicForm} this
         */
        applyToFields : function(o){
            this.items.each(function(f){
               Ext.apply(f, o);
            });
            return this;
        },

        /**
         * Calls {@link Ext#applyIf} for all field in this form with the passed object.
         * @param {Object} values
         * @return {BasicForm} this
         */
        applyIfToFields : function(o){
            this.items.each(function(f){
               Ext.applyIf(f, o);
            });
            return this;
        },

        callFieldMethod : function(fnName, args){
            args = args || [];
            this.items.each(function(f){
                if(Ext.isFunction(f[fnName])){
                    f[fnName].apply(f, args);
                }
            });
            return this;
        }
    });

    // back compat
    Ext.BasicForm = Ext.form.BasicForm;