The source code

X-Git-Url: http://git.ithinksw.org/extjs.git/blobdiff_plain/6e39d509471fe9b4e2660e0d1631b350d0c66f40..c8256059947f3aa8f5b0a9a2acf55e2142bb4742:/docs/source/DataProxy.html diff --git a/docs/source/DataProxy.html b/docs/source/DataProxy.html index 37888cb2..0f5b5daa 100644 --- a/docs/source/DataProxy.html +++ b/docs/source/DataProxy.html @@ -1,516 +1,522 @@ - - - - The source code - - - - -

/**
- * @class Ext.data.DataProxy
- * @extends Ext.util.Observable
- * Abstract base class for implementations which provide retrieval of unformatted data objects.
- * This class is intended to be extended and should not be created directly. For existing implementations,
- * see {@link Ext.data.DirectProxy}, {@link Ext.data.HttpProxy}, {@link Ext.data.ScriptTagProxy} and
- * {@link Ext.data.MemoryProxy}.
- * DataProxy implementations are usually used in conjunction with an implementation of {@link Ext.data.DataReader}
- * (of the appropriate type which knows how to parse the data object) to provide a block of
- * {@link Ext.data.Records} to an {@link Ext.data.Store}.
- * The parameter to a DataProxy constructor may be an {@link Ext.data.Connection} or can also be the
- * config object to an {@link Ext.data.Connection}.
- * Custom implementations must implement either the doRequest method (preferred) or the
- * load method (deprecated). See
- * {@link Ext.data.HttpProxy}.{@link Ext.data.HttpProxy#doRequest doRequest} or
- * {@link Ext.data.HttpProxy}.{@link Ext.data.HttpProxy#load load} for additional details.
- * Example 1
- * 
-proxy: new Ext.data.ScriptTagProxy({
-    {@link Ext.data.Connection#url url}: 'http://extjs.com/forum/topics-remote.php'
-}),
- * 
- * Example 2
- * 
-proxy : new Ext.data.HttpProxy({
-    {@link Ext.data.Connection#method method}: 'GET',
-    {@link Ext.data.HttpProxy#prettyUrls prettyUrls}: false,
-    {@link Ext.data.Connection#url url}: 'local/default.php', // see options parameter for {@link Ext.Ajax#request}
-    {@link #api}: {
-        // all actions except the following will use above url
-        create  : 'local/new.php',
-        update  : 'local/update.php'
-    }
-}),
- * 
- * And new in Ext version 3, attach centralized event-listeners upon the DataProxy class itself!  This is a great place
- * to implement a messaging system to centralize your application's user-feedback and error-handling.
- * 
-// Listen to all "beforewrite" event fired by all proxies.
-Ext.data.DataProxy.on('beforewrite', function(proxy, action) {
-    console.log('beforewrite: ', action);
-});
-
-// Listen to "write" event fired by all proxies
-Ext.data.DataProxy.on('write', function(proxy, action, data, res, rs) {
-    console.info('write: ', action);
-});
-
-// Listen to "exception" event fired by all proxies
-Ext.data.DataProxy.on('exception', function(proxy, type, action) {
-    console.error(type + action + ' exception);
-});
- * 
- * Note: These three events are all fired with the signature of the corresponding DataProxy instance event {@link #beforewrite beforewrite}, {@link #write write} and {@link #exception exception}.
- */
-Ext.data.DataProxy = function(conn){
-    // make sure we have a config object here to support ux proxies.
-    // All proxies should now send config into superclass constructor.
-    conn = conn || {};
-
-    // This line caused a bug when people use custom Connection object having its own request method.
-    // http://extjs.com/forum/showthread.php?t=67194.  Have to set DataProxy config
-    //Ext.applyIf(this, conn);
-
-    this.api     = conn.api;
-    this.url     = conn.url;
-    this.restful = conn.restful;
-    this.listeners = conn.listeners;
-
-    // deprecated
-    this.prettyUrls = conn.prettyUrls;
-
-    /**
-     * @cfg {Object} api
-     * Specific urls to call on CRUD action methods "read", "create", "update" and "destroy".
-     * Defaults to:
-api: {
-    read    : undefined,
-    create  : undefined,
-    update  : undefined,
-    destroy : undefined
-}
-     * 
-     * The url is built based upon the action being executed [load|create|save|destroy]
-     * using the commensurate {@link #api} property, or if undefined default to the
-     * configured {@link Ext.data.Store}.{@link Ext.data.Store#url url}.


-     * For example:
-     * 
-api: {
-    load :    '/controller/load',
-    create :  '/controller/new',  // Server MUST return idProperty of new record
-    save :    '/controller/update',
-    destroy : '/controller/destroy_action'
-}
-
-// Alternatively, one can use the object-form to specify each API-action
-api: {
-    load: {url: 'read.php', method: 'GET'},
-    create: 'create.php',
-    destroy: 'destroy.php',
-    save: 'update.php'
-}
-     * 
-     * If the specific URL for a given CRUD action is undefined, the CRUD action request
-     * will be directed to the configured {@link Ext.data.Connection#url url}.
-     * 
Note: To modify the URL for an action dynamically the appropriate API
-     * property should be modified before the action is requested using the corresponding before
-     * action event.  For example to modify the URL associated with the load action:
-     * 

-// modify the url for the action
-myStore.on({
-    beforeload: {
-        fn: function (store, options) {
-            // use {@link Ext.data.HttpProxy#setUrl setUrl} to change the URL for *just* this request.
-            store.proxy.setUrl('changed1.php');
-
-            // set optional second parameter to true to make this URL change
-            // permanent, applying this URL for all subsequent requests.
-            store.proxy.setUrl('changed1.php', true);
-
-            // Altering the proxy API should be done using the public
-            // method {@link Ext.data.DataProxy#setApi setApi}.
-            store.proxy.setApi('read', 'changed2.php');
-
-            // Or set the entire API with a config-object.
-            // When using the config-object option, you must redefine the entire
-            // API -- not just a specific action of it.
-            store.proxy.setApi({
-                read    : 'changed_read.php',
-                create  : 'changed_create.php',
-                update  : 'changed_update.php',
-                destroy : 'changed_destroy.php'
-            });
-        }
-    }
-});
-     * 
-     * 
-     */
-
-    this.addEvents(
-        /**
-         * @event exception
-         * Fires if an exception occurs in the Proxy during a remote request. This event is relayed
-         * through a corresponding {@link Ext.data.Store}.{@link Ext.data.Store#exception exception},
-         * so any Store instance may observe this event.
-         * In addition to being fired through the DataProxy instance that raised the event, this event is also fired
-         * through the Ext.data.DataProxy class to allow for centralized processing of exception events from all
-         * DataProxies by attaching a listener to the Ext.data.Proxy class itself.
-         * This event can be fired for one of two reasons:
-         * 
-         * remote-request failed : 
-         * The server did not return status === 200.
-         * 
-         * remote-request succeeded : 
-         * The remote-request succeeded but the reader could not read the response.
-         * This means the server returned data, but the configured Reader threw an
-         * error while reading the response.  In this case, this event will be
-         * raised and the caught error will be passed along into this event.
-         * 
-         * 
-         * 
This event fires with two different contexts based upon the 2nd
-         * parameter type [remote|response].  The first four parameters
-         * are identical between the two contexts -- only the final two parameters
-         * differ.
-         * @param {DataProxy} this The proxy that sent the request
-         * @param {String} type
-         * The value of this parameter will be either 'response' or 'remote'.
-         * 
-         * 'response' : 
-         * An invalid response from the server was returned: either 404,
-         * 500 or the response meta-data does not match that defined in the DataReader
-         * (e.g.: root, idProperty, successProperty).
-         * 
-         * 'remote' : 
-         * A valid response was returned from the server having
-         * successProperty === false.  This response might contain an error-message
-         * sent from the server.  For example, the user may have failed
-         * authentication/authorization or a database validation error occurred.
-         * 
-         * 
-         * @param {String} action Name of the action (see {@link Ext.data.Api#actions}.
-         * @param {Object} options The options for the action that were specified in the {@link #request}.
-         * @param {Object} response
-         * The value of this parameter depends on the value of the type parameter:
-         * 
-         * 'response' : 
-         * The raw browser response object (e.g.: XMLHttpRequest)
-         * 
-         * 'remote' : 
-         * The decoded response object sent from the server.
-         * 
-         * 
-         * @param {Mixed} arg
-         * The type and value of this parameter depends on the value of the type parameter:
-         * 
-         * 'response' : Error
-         * The JavaScript Error object caught if the configured Reader could not read the data.
-         * If the remote request returns success===false, this parameter will be null.
-         * 
-         * 'remote' : Record/Record[]
-         * This parameter will only exist if the action was a write action
-         * (Ext.data.Api.actions.create|update|destroy).
-         * 
-         * 
-         */
-        'exception',
-        /**
-         * @event beforeload
-         * Fires before a request to retrieve a data object.
-         * @param {DataProxy} this The proxy for the request
-         * @param {Object} params The params object passed to the {@link #request} function
-         */
-        'beforeload',
-        /**
-         * @event load
-         * Fires before the load method's callback is called.
-         * @param {DataProxy} this The proxy for the request
-         * @param {Object} o The request transaction object
-         * @param {Object} options The callback's options property as passed to the {@link #request} function
-         */
-        'load',
-        /**
-         * @event loadexception
-         * This event is deprecated.  The signature of the loadexception event
-         * varies depending on the proxy, use the catch-all {@link #exception} event instead.
-         * This event will fire in addition to the {@link #exception} event.
-         * @param {misc} misc See {@link #exception}.
-         * @deprecated
-         */
-        'loadexception',
-        /**
-         * @event beforewrite
-         * Fires before a request is generated for one of the actions Ext.data.Api.actions.create|update|destroy
-         * In addition to being fired through the DataProxy instance that raised the event, this event is also fired
-         * through the Ext.data.DataProxy class to allow for centralized processing of beforewrite events from all
-         * DataProxies by attaching a listener to the Ext.data.Proxy class itself.
-         * @param {DataProxy} this The proxy for the request
-         * @param {String} action [Ext.data.Api.actions.create|update|destroy]
-         * @param {Record/Array[Record]} rs The Record(s) to create|update|destroy.
-         * @param {Object} params The request params object.  Edit params to add parameters to the request.
-         */
-        'beforewrite',
-        /**
-         * @event write
-         * Fires before the request-callback is called
-         * In addition to being fired through the DataProxy instance that raised the event, this event is also fired
-         * through the Ext.data.DataProxy class to allow for centralized processing of write events from all
-         * DataProxies by attaching a listener to the Ext.data.Proxy class itself.
-         * @param {DataProxy} this The proxy that sent the request
-         * @param {String} action [Ext.data.Api.actions.create|upate|destroy]
-         * @param {Object} data The data object extracted from the server-response
-         * @param {Object} response The decoded response from server
-         * @param {Record/Record{}} rs The records from Store
-         * @param {Object} options The callback's options property as passed to the {@link #request} function
-         */
-        'write'
-    );
-    Ext.data.DataProxy.superclass.constructor.call(this);
-
-    // Prepare the proxy api.  Ensures all API-actions are defined with the Object-form.
-    try {
-        Ext.data.Api.prepare(this);
-    } catch (e) {
-        if (e instanceof Ext.data.Api.Error) {
-            e.toConsole();
-        }
-    }
-    // relay each proxy's events onto Ext.data.DataProxy class for centralized Proxy-listening
-    Ext.data.DataProxy.relayEvents(this, ['beforewrite', 'write', 'exception']);
-};
-
-Ext.extend(Ext.data.DataProxy, Ext.util.Observable, {
-    /**
-     * @cfg {Boolean} restful
-     * Defaults to false.  Set to true to operate in a RESTful manner.
-     * 
 Note: this parameter will automatically be set to true if the
-     * {@link Ext.data.Store} it is plugged into is set to restful: true. If the
-     * Store is RESTful, there is no need to set this option on the proxy.
-     * 
RESTful implementations enable the serverside framework to automatically route
-     * actions sent to one url based upon the HTTP method, for example:
-     * 

-store: new Ext.data.Store({
-    restful: true,
-    proxy: new Ext.data.HttpProxy({url:'/users'}); // all requests sent to /users
-    ...
-)}
-     * 
-     * If there is no {@link #api} specified in the configuration of the proxy,
-     * all requests will be marshalled to a single RESTful url (/users) so the serverside
-     * framework can inspect the HTTP Method and act accordingly:
-     * -Method   url        action
-POST     /users     create
-GET      /users     read
-PUT      /users/23  update
-DESTROY  /users/23  delete
-     * 

-     * If set to true, a {@link Ext.data.Record#phantom non-phantom} record's
-     * {@link Ext.data.Record#id id} will be appended to the url. Some MVC (e.g., Ruby on Rails,
-     * Merb and Django) support segment based urls where the segments in the URL follow the
-     * Model-View-Controller approach:

-     * someSite.com/controller/action/id
-     * 
-     * Where the segments in the url are typically:
-     * The first segment : represents the controller class that should be invoked.
-     * The second segment : represents the class function, or method, that should be called.
-     * The third segment : represents the ID (a variable typically passed to the method).
-     * 

-     * 
Refer to {@link Ext.data.DataProxy#api} for additional information.
-     */
-    restful: false,
-
-    /**
-     * Redefines the Proxy's API or a single action of an API. Can be called with two method signatures.
-     * If called with an object as the only parameter, the object should redefine the entire API, e.g.:

-proxy.setApi({
-    read    : '/users/read',
-    create  : '/users/create',
-    update  : '/users/update',
-    destroy : '/users/destroy'
-});
-
-     * If called with two parameters, the first parameter should be a string specifying the API action to
-     * redefine and the second parameter should be the URL (or function if using DirectProxy) to call for that action, e.g.:

-proxy.setApi(Ext.data.Api.actions.read, '/users/new_load_url');
-
-     * @param {String/Object} api An API specification object, or the name of an action.
-     * @param {String/Function} url The URL (or function if using DirectProxy) to call for the action.
-     */
-    setApi : function() {
-        if (arguments.length == 1) {
-            var valid = Ext.data.Api.isValid(arguments[0]);
-            if (valid === true) {
-                this.api = arguments[0];
-            }
-            else {
-                throw new Ext.data.Api.Error('invalid', valid);
-            }
-        }
-        else if (arguments.length == 2) {
-            if (!Ext.data.Api.isAction(arguments[0])) {
-                throw new Ext.data.Api.Error('invalid', arguments[0]);
-            }
-            this.api[arguments[0]] = arguments[1];
-        }
-        Ext.data.Api.prepare(this);
-    },
-
-    /**
-     * Returns true if the specified action is defined as a unique action in the api-config.
-     * request.  If all API-actions are routed to unique urls, the xaction parameter is unecessary.  However, if no api is defined
-     * and all Proxy actions are routed to DataProxy#url, the server-side will require the xaction parameter to perform a switch to
-     * the corresponding code for CRUD action.
-     * @param {String [Ext.data.Api.CREATE|READ|UPDATE|DESTROY]} action
-     * @return {Boolean}
-     */
-    isApiAction : function(action) {
-        return (this.api[action]) ? true : false;
-    },
-
-    /**
-     * All proxy actions are executed through this method.  Automatically fires the "before" + action event
-     * @param {String} action Name of the action
-     * @param {Ext.data.Record/Ext.data.Record[]/null} rs Will be null when action is 'load'
-     * @param {Object} params
-     * @param {Ext.data.DataReader} reader
-     * @param {Function} callback
-     * @param {Object} scope The scope (this reference) in which the callback function is executed. Defaults to the Proxy object.
-     * @param {Object} options Any options specified for the action (e.g. see {@link Ext.data.Store#load}.
-     */
-    request : function(action, rs, params, reader, callback, scope, options) {
-        if (!this.api[action] && !this.load) {
-            throw new Ext.data.DataProxy.Error('action-undefined', action);
-        }
-        params = params || {};
-        if ((action === Ext.data.Api.actions.read) ? this.fireEvent("beforeload", this, params) : this.fireEvent("beforewrite", this, action, rs, params) !== false) {
-            this.doRequest.apply(this, arguments);
-        }
-        else {
-            callback.call(scope || this, null, options, false);
-        }
-    },
-
-
-    /**
-     * Deprecated load method using old method signature. See {@doRequest} for preferred method.
-     * @deprecated
-     * @param {Object} params
-     * @param {Object} reader
-     * @param {Object} callback
-     * @param {Object} scope
-     * @param {Object} arg
-     */
-    load : null,
-
-    /**
-     * @cfg {Function} doRequest Abstract method that should be implemented in all subclasses.  Note: Should only be used by custom-proxy developers.
-     * (e.g.: {@link Ext.data.HttpProxy#doRequest HttpProxy.doRequest},
-     * {@link Ext.data.DirectProxy#doRequest DirectProxy.doRequest}).
-     */
-    doRequest : function(action, rs, params, reader, callback, scope, options) {
-        // default implementation of doRequest for backwards compatibility with 2.0 proxies.
-        // If we're executing here, the action is probably "load".
-        // Call with the pre-3.0 method signature.
-        this.load(params, reader, callback, scope, options);
-    },
-
-    /**
-     * @cfg {Function} onRead Abstract method that should be implemented in all subclasses.  Note: Should only be used by custom-proxy developers.  Callback for read {@link Ext.data.Api#actions action}.
-     * @param {String} action Action name as per {@link Ext.data.Api.actions#read}.
-     * @param {Object} o The request transaction object
-     * @param {Object} res The server response
-     * @fires loadexception (deprecated)
-     * @fires exception
-     * @fires load
-     * @protected
-     */
-    onRead : Ext.emptyFn,
-    /**
-     * @cfg {Function} onWrite Abstract method that should be implemented in all subclasses.  Note: Should only be used by custom-proxy developers.  Callback for create, update and destroy {@link Ext.data.Api#actions actions}.
-     * @param {String} action [Ext.data.Api.actions.create|read|update|destroy]
-     * @param {Object} trans The request transaction object
-     * @param {Object} res The server response
-     * @fires exception
-     * @fires write
-     * @protected
-     */
-    onWrite : Ext.emptyFn,
-    /**
-     * buildUrl
-     * Sets the appropriate url based upon the action being executed.  If restful is true, and only a single record is being acted upon,
-     * url will be built Rails-style, as in "/controller/action/32".  restful will aply iff the supplied record is an
-     * instance of Ext.data.Record rather than an Array of them.
-     * @param {String} action The api action being executed [read|create|update|destroy]
-     * @param {Ext.data.Record/Array[Ext.data.Record]} The record or Array of Records being acted upon.
-     * @return {String} url
-     * @private
-     */
-    buildUrl : function(action, record) {
-        record = record || null;
-
-        // conn.url gets nullified after each request.  If it's NOT null here, that means the user must have intervened with a call
-        // to DataProxy#setUrl or DataProxy#setApi and changed it before the request was executed.  If that's the case, use conn.url,
-        // otherwise, build the url from the api or this.url.
-        var url = (this.conn && this.conn.url) ? this.conn.url : (this.api[action]) ? this.api[action].url : this.url;
-        if (!url) {
-            throw new Ext.data.Api.Error('invalid-url', action);
-        }
-
-        // look for urls having "provides" suffix used in some MVC frameworks like Rails/Merb and others.  The provides suffice informs
-        // the server what data-format the client is dealing with and returns data in the same format (eg: application/json, application/xml, etc)
-        // e.g.: /users.json, /users.xml, etc.
-        // with restful routes, we need urls like:
-        // PUT /users/1.json
-        // DELETE /users/1.json
-        var provides = null;
-        var m = url.match(/(.*)(\.json|\.xml|\.html)$/);
-        if (m) {
-            provides = m[2];    // eg ".json"
-            url      = m[1];    // eg: "/users"
-        }
-        // prettyUrls is deprectated in favor of restful-config
-        if ((this.restful === true || this.prettyUrls === true) && record instanceof Ext.data.Record && !record.phantom) {
-            url += '/' + record.id;
-        }
-        return (provides === null) ? url : url + provides;
-    },
-
-    /**
-     * Destroys the proxy by purging any event listeners and cancelling any active requests.
-     */
-    destroy: function(){
-        this.purgeListeners();
-    }
-});
-
-// Apply the Observable prototype to the DataProxy class so that proxy instances can relay their
-// events to the class.  Allows for centralized listening of all proxy instances upon the DataProxy class.
-Ext.apply(Ext.data.DataProxy, Ext.util.Observable.prototype);
-Ext.util.Observable.call(Ext.data.DataProxy);
-
-/**
- * @class Ext.data.DataProxy.Error
- * @extends Ext.Error
- * DataProxy Error extension.
- * constructor
- * @param {String} name
- * @param {Record/Array[Record]/Array}
- */
-Ext.data.DataProxy.Error = Ext.extend(Ext.Error, {
-    constructor : function(message, arg) {
-        this.arg = arg;
-        Ext.Error.call(this, message);
-    },
-    name: 'Ext.data.DataProxy'
-});
-Ext.apply(Ext.data.DataProxy.Error.prototype, {
-    lang: {
-        'action-undefined': "DataProxy attempted to execute an API-action but found an undefined url / function.  Please review your Proxy url/api-configuration.",
-        'api-invalid': 'Recieved an invalid API-configuration.  Please ensure your proxy API-configuration contains only the actions from Ext.data.Api.actions.'
-    }
-});
-
-
-

- + + + + The source code + + + + +

/*!
+ * Ext JS Library 3.2.1
+ * Copyright(c) 2006-2010 Ext JS, Inc.
+ * licensing@extjs.com
+ * http://www.extjs.com/license
+ */
+/**
+ * @class Ext.data.DataProxy
+ * @extends Ext.util.Observable
+ * Abstract base class for implementations which provide retrieval of unformatted data objects.
+ * This class is intended to be extended and should not be created directly. For existing implementations,
+ * see {@link Ext.data.DirectProxy}, {@link Ext.data.HttpProxy}, {@link Ext.data.ScriptTagProxy} and
+ * {@link Ext.data.MemoryProxy}.
+ * DataProxy implementations are usually used in conjunction with an implementation of {@link Ext.data.DataReader}
+ * (of the appropriate type which knows how to parse the data object) to provide a block of
+ * {@link Ext.data.Records} to an {@link Ext.data.Store}.
+ * The parameter to a DataProxy constructor may be an {@link Ext.data.Connection} or can also be the
+ * config object to an {@link Ext.data.Connection}.
+ * Custom implementations must implement either the doRequest method (preferred) or the
+ * load method (deprecated). See
+ * {@link Ext.data.HttpProxy}.{@link Ext.data.HttpProxy#doRequest doRequest} or
+ * {@link Ext.data.HttpProxy}.{@link Ext.data.HttpProxy#load load} for additional details.
+ * Example 1
+ * 
+proxy: new Ext.data.ScriptTagProxy({
+    {@link Ext.data.Connection#url url}: 'http://extjs.com/forum/topics-remote.php'
+}),
+ * 
+ * Example 2
+ * 
+proxy : new Ext.data.HttpProxy({
+    {@link Ext.data.Connection#method method}: 'GET',
+    {@link Ext.data.HttpProxy#prettyUrls prettyUrls}: false,
+    {@link Ext.data.Connection#url url}: 'local/default.php', // see options parameter for {@link Ext.Ajax#request}
+    {@link #api}: {
+        // all actions except the following will use above url
+        create  : 'local/new.php',
+        update  : 'local/update.php'
+    }
+}),
+ * 
+ * And new in Ext version 3, attach centralized event-listeners upon the DataProxy class itself!  This is a great place
+ * to implement a messaging system to centralize your application's user-feedback and error-handling.
+ * 
+// Listen to all "beforewrite" event fired by all proxies.
+Ext.data.DataProxy.on('beforewrite', function(proxy, action) {
+    console.log('beforewrite: ', action);
+});
+
+// Listen to "write" event fired by all proxies
+Ext.data.DataProxy.on('write', function(proxy, action, data, res, rs) {
+    console.info('write: ', action);
+});
+
+// Listen to "exception" event fired by all proxies
+Ext.data.DataProxy.on('exception', function(proxy, type, action) {
+    console.error(type + action + ' exception);
+});
+ * 
+ * Note: These three events are all fired with the signature of the corresponding DataProxy instance event {@link #beforewrite beforewrite}, {@link #write write} and {@link #exception exception}.
+ */
+Ext.data.DataProxy = function(conn){
+    // make sure we have a config object here to support ux proxies.
+    // All proxies should now send config into superclass constructor.
+    conn = conn || {};
+
+    // This line caused a bug when people use custom Connection object having its own request method.
+    // http://extjs.com/forum/showthread.php?t=67194.  Have to set DataProxy config
+    //Ext.applyIf(this, conn);
+
+    this.api     = conn.api;
+    this.url     = conn.url;
+    this.restful = conn.restful;
+    this.listeners = conn.listeners;
+
+    // deprecated
+    this.prettyUrls = conn.prettyUrls;
+
+    /**
+     * @cfg {Object} api
+     * Specific urls to call on CRUD action methods "read", "create", "update" and "destroy".
+     * Defaults to:
+api: {
+    read    : undefined,
+    create  : undefined,
+    update  : undefined,
+    destroy : undefined
+}
+     * 
+     * The url is built based upon the action being executed [load|create|save|destroy]
+     * using the commensurate {@link #api} property, or if undefined default to the
+     * configured {@link Ext.data.Store}.{@link Ext.data.Store#url url}.


+     * For example:
+     * 
+api: {
+    load :    '/controller/load',
+    create :  '/controller/new',  // Server MUST return idProperty of new record
+    save :    '/controller/update',
+    destroy : '/controller/destroy_action'
+}
+
+// Alternatively, one can use the object-form to specify each API-action
+api: {
+    load: {url: 'read.php', method: 'GET'},
+    create: 'create.php',
+    destroy: 'destroy.php',
+    save: 'update.php'
+}
+     * 
+     * If the specific URL for a given CRUD action is undefined, the CRUD action request
+     * will be directed to the configured {@link Ext.data.Connection#url url}.
+     * 
Note: To modify the URL for an action dynamically the appropriate API
+     * property should be modified before the action is requested using the corresponding before
+     * action event.  For example to modify the URL associated with the load action:
+     * 

+// modify the url for the action
+myStore.on({
+    beforeload: {
+        fn: function (store, options) {
+            // use {@link Ext.data.HttpProxy#setUrl setUrl} to change the URL for *just* this request.
+            store.proxy.setUrl('changed1.php');
+
+            // set optional second parameter to true to make this URL change
+            // permanent, applying this URL for all subsequent requests.
+            store.proxy.setUrl('changed1.php', true);
+
+            // Altering the proxy API should be done using the public
+            // method {@link Ext.data.DataProxy#setApi setApi}.
+            store.proxy.setApi('read', 'changed2.php');
+
+            // Or set the entire API with a config-object.
+            // When using the config-object option, you must redefine the entire
+            // API -- not just a specific action of it.
+            store.proxy.setApi({
+                read    : 'changed_read.php',
+                create  : 'changed_create.php',
+                update  : 'changed_update.php',
+                destroy : 'changed_destroy.php'
+            });
+        }
+    }
+});
+     * 
+     * 
+     */
+
+    this.addEvents(
+        /**
+         * @event exception
+         * Fires if an exception occurs in the Proxy during a remote request. This event is relayed
+         * through a corresponding {@link Ext.data.Store}.{@link Ext.data.Store#exception exception},
+         * so any Store instance may observe this event.
+         * In addition to being fired through the DataProxy instance that raised the event, this event is also fired
+         * through the Ext.data.DataProxy class to allow for centralized processing of exception events from all
+         * DataProxies by attaching a listener to the Ext.data.Proxy class itself.
+         * This event can be fired for one of two reasons:
+         * 
+         * remote-request failed : 
+         * The server did not return status === 200.
+         * 
+         * remote-request succeeded : 
+         * The remote-request succeeded but the reader could not read the response.
+         * This means the server returned data, but the configured Reader threw an
+         * error while reading the response.  In this case, this event will be
+         * raised and the caught error will be passed along into this event.
+         * 
+         * 
+         * 
This event fires with two different contexts based upon the 2nd
+         * parameter type [remote|response].  The first four parameters
+         * are identical between the two contexts -- only the final two parameters
+         * differ.
+         * @param {DataProxy} this The proxy that sent the request
+         * @param {String} type
+         * The value of this parameter will be either 'response' or 'remote'.
+         * 
+         * 'response' : 
+         * An invalid response from the server was returned: either 404,
+         * 500 or the response meta-data does not match that defined in the DataReader
+         * (e.g.: root, idProperty, successProperty).
+         * 
+         * 'remote' : 
+         * A valid response was returned from the server having
+         * successProperty === false.  This response might contain an error-message
+         * sent from the server.  For example, the user may have failed
+         * authentication/authorization or a database validation error occurred.
+         * 
+         * 
+         * @param {String} action Name of the action (see {@link Ext.data.Api#actions}.
+         * @param {Object} options The options for the action that were specified in the {@link #request}.
+         * @param {Object} response
+         * The value of this parameter depends on the value of the type parameter:
+         * 
+         * 'response' : 
+         * The raw browser response object (e.g.: XMLHttpRequest)
+         * 
+         * 'remote' : 
+         * The decoded response object sent from the server.
+         * 
+         * 
+         * @param {Mixed} arg
+         * The type and value of this parameter depends on the value of the type parameter:
+         * 
+         * 'response' : Error
+         * The JavaScript Error object caught if the configured Reader could not read the data.
+         * If the remote request returns success===false, this parameter will be null.
+         * 
+         * 'remote' : Record/Record[]
+         * This parameter will only exist if the action was a write action
+         * (Ext.data.Api.actions.create|update|destroy).
+         * 
+         * 
+         */
+        'exception',
+        /**
+         * @event beforeload
+         * Fires before a request to retrieve a data object.
+         * @param {DataProxy} this The proxy for the request
+         * @param {Object} params The params object passed to the {@link #request} function
+         */
+        'beforeload',
+        /**
+         * @event load
+         * Fires before the load method's callback is called.
+         * @param {DataProxy} this The proxy for the request
+         * @param {Object} o The request transaction object
+         * @param {Object} options The callback's options property as passed to the {@link #request} function
+         */
+        'load',
+        /**
+         * @event loadexception
+         * This event is deprecated.  The signature of the loadexception event
+         * varies depending on the proxy, use the catch-all {@link #exception} event instead.
+         * This event will fire in addition to the {@link #exception} event.
+         * @param {misc} misc See {@link #exception}.
+         * @deprecated
+         */
+        'loadexception',
+        /**
+         * @event beforewrite
+         * Fires before a request is generated for one of the actions Ext.data.Api.actions.create|update|destroy
+         * In addition to being fired through the DataProxy instance that raised the event, this event is also fired
+         * through the Ext.data.DataProxy class to allow for centralized processing of beforewrite events from all
+         * DataProxies by attaching a listener to the Ext.data.Proxy class itself.
+         * @param {DataProxy} this The proxy for the request
+         * @param {String} action [Ext.data.Api.actions.create|update|destroy]
+         * @param {Record/Record[]} rs The Record(s) to create|update|destroy.
+         * @param {Object} params The request params object.  Edit params to add parameters to the request.
+         */
+        'beforewrite',
+        /**
+         * @event write
+         * Fires before the request-callback is called
+         * In addition to being fired through the DataProxy instance that raised the event, this event is also fired
+         * through the Ext.data.DataProxy class to allow for centralized processing of write events from all
+         * DataProxies by attaching a listener to the Ext.data.Proxy class itself.
+         * @param {DataProxy} this The proxy that sent the request
+         * @param {String} action [Ext.data.Api.actions.create|upate|destroy]
+         * @param {Object} data The data object extracted from the server-response
+         * @param {Object} response The decoded response from server
+         * @param {Record/Record[]} rs The Record(s) from Store
+         * @param {Object} options The callback's options property as passed to the {@link #request} function
+         */
+        'write'
+    );
+    Ext.data.DataProxy.superclass.constructor.call(this);
+
+    // Prepare the proxy api.  Ensures all API-actions are defined with the Object-form.
+    try {
+        Ext.data.Api.prepare(this);
+    } catch (e) {
+        if (e instanceof Ext.data.Api.Error) {
+            e.toConsole();
+        }
+    }
+    // relay each proxy's events onto Ext.data.DataProxy class for centralized Proxy-listening
+    Ext.data.DataProxy.relayEvents(this, ['beforewrite', 'write', 'exception']);
+};
+
+Ext.extend(Ext.data.DataProxy, Ext.util.Observable, {
+    /**
+     * @cfg {Boolean} restful
+     * Defaults to false.  Set to true to operate in a RESTful manner.
+     * 
 Note: this parameter will automatically be set to true if the
+     * {@link Ext.data.Store} it is plugged into is set to restful: true. If the
+     * Store is RESTful, there is no need to set this option on the proxy.
+     * 
RESTful implementations enable the serverside framework to automatically route
+     * actions sent to one url based upon the HTTP method, for example:
+     * 

+store: new Ext.data.Store({
+    restful: true,
+    proxy: new Ext.data.HttpProxy({url:'/users'}); // all requests sent to /users
+    ...
+)}
+     * 
+     * If there is no {@link #api} specified in the configuration of the proxy,
+     * all requests will be marshalled to a single RESTful url (/users) so the serverside
+     * framework can inspect the HTTP Method and act accordingly:
+     * +Method   url        action
+POST     /users     create
+GET      /users     read
+PUT      /users/23  update
+DESTROY  /users/23  delete
+     * 

+     * If set to true, a {@link Ext.data.Record#phantom non-phantom} record's
+     * {@link Ext.data.Record#id id} will be appended to the url. Some MVC (e.g., Ruby on Rails,
+     * Merb and Django) support segment based urls where the segments in the URL follow the
+     * Model-View-Controller approach:

+     * someSite.com/controller/action/id
+     * 
+     * Where the segments in the url are typically:
+     * The first segment : represents the controller class that should be invoked.
+     * The second segment : represents the class function, or method, that should be called.
+     * The third segment : represents the ID (a variable typically passed to the method).
+     * 

+     * 
Refer to {@link Ext.data.DataProxy#api} for additional information.
+     */
+    restful: false,
+
+    /**
+     * Redefines the Proxy's API or a single action of an API. Can be called with two method signatures.
+     * If called with an object as the only parameter, the object should redefine the entire API, e.g.:

+proxy.setApi({
+    read    : '/users/read',
+    create  : '/users/create',
+    update  : '/users/update',
+    destroy : '/users/destroy'
+});
+
+     * If called with two parameters, the first parameter should be a string specifying the API action to
+     * redefine and the second parameter should be the URL (or function if using DirectProxy) to call for that action, e.g.:

+proxy.setApi(Ext.data.Api.actions.read, '/users/new_load_url');
+
+     * @param {String/Object} api An API specification object, or the name of an action.
+     * @param {String/Function} url The URL (or function if using DirectProxy) to call for the action.
+     */
+    setApi : function() {
+        if (arguments.length == 1) {
+            var valid = Ext.data.Api.isValid(arguments[0]);
+            if (valid === true) {
+                this.api = arguments[0];
+            }
+            else {
+                throw new Ext.data.Api.Error('invalid', valid);
+            }
+        }
+        else if (arguments.length == 2) {
+            if (!Ext.data.Api.isAction(arguments[0])) {
+                throw new Ext.data.Api.Error('invalid', arguments[0]);
+            }
+            this.api[arguments[0]] = arguments[1];
+        }
+        Ext.data.Api.prepare(this);
+    },
+
+    /**
+     * Returns true if the specified action is defined as a unique action in the api-config.
+     * request.  If all API-actions are routed to unique urls, the xaction parameter is unecessary.  However, if no api is defined
+     * and all Proxy actions are routed to DataProxy#url, the server-side will require the xaction parameter to perform a switch to
+     * the corresponding code for CRUD action.
+     * @param {String [Ext.data.Api.CREATE|READ|UPDATE|DESTROY]} action
+     * @return {Boolean}
+     */
+    isApiAction : function(action) {
+        return (this.api[action]) ? true : false;
+    },
+
+    /**
+     * All proxy actions are executed through this method.  Automatically fires the "before" + action event
+     * @param {String} action Name of the action
+     * @param {Ext.data.Record/Ext.data.Record[]/null} rs Will be null when action is 'load'
+     * @param {Object} params
+     * @param {Ext.data.DataReader} reader
+     * @param {Function} callback
+     * @param {Object} scope The scope (this reference) in which the callback function is executed. Defaults to the Proxy object.
+     * @param {Object} options Any options specified for the action (e.g. see {@link Ext.data.Store#load}.
+     */
+    request : function(action, rs, params, reader, callback, scope, options) {
+        if (!this.api[action] && !this.load) {
+            throw new Ext.data.DataProxy.Error('action-undefined', action);
+        }
+        params = params || {};
+        if ((action === Ext.data.Api.actions.read) ? this.fireEvent("beforeload", this, params) : this.fireEvent("beforewrite", this, action, rs, params) !== false) {
+            this.doRequest.apply(this, arguments);
+        }
+        else {
+            callback.call(scope || this, null, options, false);
+        }
+    },
+
+
+    /**
+     * Deprecated load method using old method signature. See {@doRequest} for preferred method.
+     * @deprecated
+     * @param {Object} params
+     * @param {Object} reader
+     * @param {Object} callback
+     * @param {Object} scope
+     * @param {Object} arg
+     */
+    load : null,
+
+    /**
+     * @cfg {Function} doRequest Abstract method that should be implemented in all subclasses.  Note: Should only be used by custom-proxy developers.
+     * (e.g.: {@link Ext.data.HttpProxy#doRequest HttpProxy.doRequest},
+     * {@link Ext.data.DirectProxy#doRequest DirectProxy.doRequest}).
+     */
+    doRequest : function(action, rs, params, reader, callback, scope, options) {
+        // default implementation of doRequest for backwards compatibility with 2.0 proxies.
+        // If we're executing here, the action is probably "load".
+        // Call with the pre-3.0 method signature.
+        this.load(params, reader, callback, scope, options);
+    },
+
+    /**
+     * @cfg {Function} onRead Abstract method that should be implemented in all subclasses.  Note: Should only be used by custom-proxy developers.  Callback for read {@link Ext.data.Api#actions action}.
+     * @param {String} action Action name as per {@link Ext.data.Api.actions#read}.
+     * @param {Object} o The request transaction object
+     * @param {Object} res The server response
+     * @fires loadexception (deprecated)
+     * @fires exception
+     * @fires load
+     * @protected
+     */
+    onRead : Ext.emptyFn,
+    /**
+     * @cfg {Function} onWrite Abstract method that should be implemented in all subclasses.  Note: Should only be used by custom-proxy developers.  Callback for create, update and destroy {@link Ext.data.Api#actions actions}.
+     * @param {String} action [Ext.data.Api.actions.create|read|update|destroy]
+     * @param {Object} trans The request transaction object
+     * @param {Object} res The server response
+     * @fires exception
+     * @fires write
+     * @protected
+     */
+    onWrite : Ext.emptyFn,
+    /**
+     * buildUrl
+     * Sets the appropriate url based upon the action being executed.  If restful is true, and only a single record is being acted upon,
+     * url will be built Rails-style, as in "/controller/action/32".  restful will aply iff the supplied record is an
+     * instance of Ext.data.Record rather than an Array of them.
+     * @param {String} action The api action being executed [read|create|update|destroy]
+     * @param {Ext.data.Record/Ext.data.Record[]} record The record or Array of Records being acted upon.
+     * @return {String} url
+     * @private
+     */
+    buildUrl : function(action, record) {
+        record = record || null;
+
+        // conn.url gets nullified after each request.  If it's NOT null here, that means the user must have intervened with a call
+        // to DataProxy#setUrl or DataProxy#setApi and changed it before the request was executed.  If that's the case, use conn.url,
+        // otherwise, build the url from the api or this.url.
+        var url = (this.conn && this.conn.url) ? this.conn.url : (this.api[action]) ? this.api[action].url : this.url;
+        if (!url) {
+            throw new Ext.data.Api.Error('invalid-url', action);
+        }
+
+        // look for urls having "provides" suffix used in some MVC frameworks like Rails/Merb and others.  The provides suffice informs
+        // the server what data-format the client is dealing with and returns data in the same format (eg: application/json, application/xml, etc)
+        // e.g.: /users.json, /users.xml, etc.
+        // with restful routes, we need urls like:
+        // PUT /users/1.json
+        // DELETE /users/1.json
+        var provides = null;
+        var m = url.match(/(.*)(\.json|\.xml|\.html)$/);
+        if (m) {
+            provides = m[2];    // eg ".json"
+            url      = m[1];    // eg: "/users"
+        }
+        // prettyUrls is deprectated in favor of restful-config
+        if ((this.restful === true || this.prettyUrls === true) && record instanceof Ext.data.Record && !record.phantom) {
+            url += '/' + record.id;
+        }
+        return (provides === null) ? url : url + provides;
+    },
+
+    /**
+     * Destroys the proxy by purging any event listeners and cancelling any active requests.
+     */
+    destroy: function(){
+        this.purgeListeners();
+    }
+});
+
+// Apply the Observable prototype to the DataProxy class so that proxy instances can relay their
+// events to the class.  Allows for centralized listening of all proxy instances upon the DataProxy class.
+Ext.apply(Ext.data.DataProxy, Ext.util.Observable.prototype);
+Ext.util.Observable.call(Ext.data.DataProxy);
+
+/**
+ * @class Ext.data.DataProxy.Error
+ * @extends Ext.Error
+ * DataProxy Error extension.
+ * constructor
+ * @param {String} message Message describing the error.
+ * @param {Record/Record[]} arg
+ */
+Ext.data.DataProxy.Error = Ext.extend(Ext.Error, {
+    constructor : function(message, arg) {
+        this.arg = arg;
+        Ext.Error.call(this, message);
+    },
+    name: 'Ext.data.DataProxy'
+});
+Ext.apply(Ext.data.DataProxy.Error.prototype, {
+    lang: {
+        'action-undefined': "DataProxy attempted to execute an API-action but found an undefined url / function.  Please review your Proxy url/api-configuration.",
+        'api-invalid': 'Recieved an invalid API-configuration.  Please ensure your proxy API-configuration contains only the actions from Ext.data.Api.actions.'
+    }
+});
+
+
+

+ \ No newline at end of file