    /**
     * A class which handles loading of data from a server into the Fields of an {@link Ext.form.Basic}.
     *
     * Instances of this class are only created by a {@link Ext.form.Basic Form} when {@link Ext.form.Basic#load load}ing.
     *
     * ## Response Packet Criteria
     *
     * A response packet **must** contain:
     *
     *   - **`success`** property : Boolean
     *   - **`data`** property : Object
     *
     * The `data` property contains the values of Fields to load. The individual value object for each Field is passed to
     * the Field's {@link Ext.form.field.Field#setValue setValue} method.
     *
     * ## JSON Packets
     *
     * By default, response packets are assumed to be JSON, so for the following form load call:
     *
     *     var myFormPanel = new Ext.form.Panel({
     *         title: 'Client and routing info',
     *         renderTo: Ext.getBody(),
     *         defaults: {
     *             xtype: 'textfield'
     *         },
     *         items: [{
     *             fieldLabel: 'Client',
     *             name: 'clientName'
     *         }, {
     *             fieldLabel: 'Port of loading',
     *             name: 'portOfLoading'
     *         }, {
     *             fieldLabel: 'Port of discharge',
     *             name: 'portOfDischarge'
     *         }]
     *     });
     *     myFormPanel.{@link Ext.form.Panel#getForm getForm}().{@link Ext.form.Basic#load load}({
     *         url: '/getRoutingInfo.php',
     *         params: {
     *             consignmentRef: myConsignmentRef
     *         },
     *         failure: function(form, action) {
     *             Ext.Msg.alert("Load failed", action.result.errorMessage);
     *         }
     *     });
     *
     * a **success response** packet may look like this:
     *
     *     {
     *         success: true,
     *         data: {
     *             clientName: "Fred. Olsen Lines",
     *             portOfLoading: "FXT",
     *             portOfDischarge: "OSL"
     *         }
     *     }
     *
     * while a **failure response** packet may look like this:
     *
     *     {
     *         success: false,
     *         errorMessage: "Consignment reference not found"
     *     }
     *
     * Other data may be placed into the response for processing the {@link Ext.form.Basic Form}'s callback or event handler
     * methods. The object decoded from this JSON is available in the {@link Ext.form.action.Action#result result} property.
     */
    Ext.define('Ext.form.action.Load', {
        extend:'Ext.form.action.Action',
        requires: ['Ext.data.Connection'],
        alternateClassName: 'Ext.form.Action.Load',
        alias: 'formaction.load',

        type: 'load',

        /**
         * @private
         */
        run: function() {
            Ext.Ajax.request(Ext.apply(
                this.createCallback(),
                {
                    method: this.getMethod(),
                    url: this.getUrl(),
                    headers: this.headers,
                    params: this.getParams()
                }
            ));
        },

        /**
         * @private
         */
        onSuccess: function(response){
            var result = this.processResponse(response),
                form = this.form;
            if (result === true || !result.success || !result.data) {
                this.failureType = Ext.form.action.Action.LOAD_FAILURE;
                form.afterAction(this, false);
                return;
            }
            form.clearInvalid();
            form.setValues(result.data);
            form.afterAction(this, true);
        },

        /**
         * @private
         */
        handleResponse: function(response) {
            var reader = this.form.reader,
                rs, data;
            if (reader) {
                rs = reader.read(response);
                data = rs.records && rs.records[0] ? rs.records[0].data : null;
                return {
                    success : rs.success,
                    data : data
                };
            }
            return Ext.decode(response.responseText);
        }
    });