    /**
     * @class Ext.form.action.Submit
     * @extends Ext.form.action.Action
     * <p>A class which handles submission of data from {@link Ext.form.Basic Form}s
     * and processes the returned response.</p>
     * <p>Instances of this class are only created by a {@link Ext.form.Basic Form} when
     * {@link Ext.form.Basic#submit submit}ting.</p>
     * <p><u><b>Response Packet Criteria</b></u></p>
     * <p>A response packet may contain:
     * <div class="mdetail-params"><ul>
     * <li><b><code>success</code></b> property : Boolean
     * <div class="sub-desc">The <code>success</code> property is required.</div></li>
     * <li><b><code>errors</code></b> property : Object
     * <div class="sub-desc"><div class="sub-desc">The <code>errors</code> property,
     * which is optional, contains error messages for invalid fields.</div></li>
     * </ul></div>
     * <p><u><b>JSON Packets</b></u></p>
     * <p>By default, response packets are assumed to be JSON, so a typical response
     * packet may look like this:</p><pre><code>
    {
        success: false,
        errors: {
            clientCode: "Client not found",
            portOfLoading: "This field must not be null"
        }
    }</code></pre>
     * <p>Other data may be placed into the response for processing by the {@link Ext.form.Basic}'s callback
     * or event handler methods. The object decoded from this JSON is available in the
     * {@link Ext.form.action.Action#result result} property.</p>
     * <p>Alternatively, if an {@link #errorReader} is specified as an {@link Ext.data.reader.Xml XmlReader}:</p><pre><code>
        errorReader: new Ext.data.reader.Xml({
                record : 'field',
                success: '@success'
            }, [
                'id', 'msg'
            ]
        )
    </code></pre>
     * <p>then the results may be sent back in XML format:</p><pre><code>
    &lt;?xml version="1.0" encoding="UTF-8"?&gt;
    &lt;message success="false"&gt;
    &lt;errors&gt;
        &lt;field&gt;
            &lt;id&gt;clientCode&lt;/id&gt;
            &lt;msg&gt;&lt;![CDATA[Code not found. &lt;br /&gt;&lt;i&gt;This is a test validation message from the server &lt;/i&gt;]]&gt;&lt;/msg&gt;
        &lt;/field&gt;
        &lt;field&gt;
            &lt;id&gt;portOfLoading&lt;/id&gt;
            &lt;msg&gt;&lt;![CDATA[Port not found. &lt;br /&gt;&lt;i&gt;This is a test validation message from the server &lt;/i&gt;]]&gt;&lt;/msg&gt;
        &lt;/field&gt;
    &lt;/errors&gt;
    &lt;/message&gt;
    </code></pre>
     * <p>Other elements may be placed into the response XML for processing by the {@link Ext.form.Basic}'s callback
     * or event handler methods. The XML document is available in the {@link #errorReader}'s {@link Ext.data.reader.Xml#xmlData xmlData} property.</p>
     */
    Ext.define('Ext.form.action.Submit', {
        extend:'Ext.form.action.Action',
        alternateClassName: 'Ext.form.Action.Submit',
        alias: 'formaction.submit',

        type: 'submit',

        /**
         * @cfg {boolean} clientValidation Determines whether a Form's fields are validated
         * in a final call to {@link Ext.form.Basic#isValid isValid} prior to submission.
         * Pass <tt>false</tt> in the Form's submit options to prevent this. Defaults to true.
         */

        // inherit docs
        run : function(){
            var form = this.form;
            if (this.clientValidation === false || form.isValid()) {
                this.doSubmit();
            } else {
                // client validation failed
                this.failureType = Ext.form.action.Action.CLIENT_INVALID;
                form.afterAction(this, false);
            }
        },

        /**
         * @private
         * Perform the submit of the form data.
         */
        doSubmit: function() {
            var formEl,
                ajaxOptions = Ext.apply(this.createCallback(), {
                    url: this.getUrl(),
                    method: this.getMethod(),
                    headers: this.headers
                });

            // For uploads we need to create an actual form that contains the file upload fields,
            // and pass that to the ajax call so it can do its iframe-based submit method.
            if (this.form.hasUpload()) {
                formEl = ajaxOptions.form = this.buildForm();
                ajaxOptions.isUpload = true;
            } else {
                ajaxOptions.params = this.getParams();
            }

            Ext.Ajax.request(ajaxOptions);

            if (formEl) {
                Ext.removeNode(formEl);
            }
        },

        /**
         * @private
         * Build the full set of parameters from the field values plus any additional configured params.
         */
        getParams: function() {
            var nope = false,
                configParams = this.callParent(),
                fieldParams = this.form.getValues(nope, nope, this.submitEmptyText !== nope);
            return Ext.apply({}, fieldParams, configParams);
        },

        /**
         * @private
         * Build a form element containing fields corresponding to all the parameters to be
         * submitted (everything returned by {@link #getParams}.
         * NOTE: the form element is automatically added to the DOM, so any code that uses
         * it must remove it from the DOM after finishing with it.
         * @return HTMLFormElement
         */
        buildForm: function() {
            var fieldsSpec = [],
                formSpec,
                formEl,
                basicForm = this.form,
                params = this.getParams(),
                uploadFields = [];

            basicForm.getFields().each(function(field) {
                if (field.isFileUpload()) {
                    uploadFields.push(field);
                }
            });

            function addField(name, val) {
                fieldsSpec.push({
                    tag: 'input',
                    type: 'hidden',
                    name: name,
                    value: Ext.String.htmlEncode(val)
                });
            }

            // Add the form field values
            Ext.iterate(params, function(key, val) {
                if (Ext.isArray(val)) {
                    Ext.each(val, function(v) {
                        addField(key, v);
                    });
                } else {
                    addField(key, val);
                }
            });

            formSpec = {
                tag: 'form',
                action: this.getUrl(),
                method: this.getMethod(),
                target: this.target || '_self',
                style: 'display:none',
                cn: fieldsSpec
            };

            // Set the proper encoding for file uploads
            if (uploadFields.length) {
                formSpec.encoding = formSpec.enctype = 'multipart/form-data';
            }

            // Create the form
            formEl = Ext.core.DomHelper.append(Ext.getBody(), formSpec);

            // Special handling for file upload fields: since browser security measures prevent setting
            // their values programatically, and prevent carrying their selected values over when cloning,
            // we have to move the actual field instances out of their components and into the form.
            Ext.Array.each(uploadFields, function(field) {
                if (field.rendered) { // can only have a selected file value after being rendered
                    formEl.appendChild(field.extractFileInput());
                }
            });

            return formEl;
        },

        /**
         * @private
         */
        onSuccess: function(response) {
            var form = this.form,
                success = true,
                result = this.processResponse(response);
            if (result !== true && !result.success) {
                if (result.errors) {
                    form.markInvalid(result.errors);
                }
                this.failureType = Ext.form.action.Action.SERVER_INVALID;
                success = false;
            }
            form.afterAction(this, success);
        },

        /**
         * @private
         */
        handleResponse: function(response) {
            var form = this.form,
                errorReader = form.errorReader,
                rs, errors, i, len, records;
            if (errorReader) {
                rs = errorReader.read(response);
                records = rs.records;
                errors = [];
                if (records) {
                    for(i = 0, len = records.length; i < len; i++) {
                        errors[i] = records[i].data;
                    }
                }
                if (errors.length < 1) {
                    errors = null;
                }
                return {
                    success : rs.success,
                    errors : errors
                };
            }
            return Ext.decode(response.responseText);
        }
    });