X-Git-Url: http://git.ithinksw.org/extjs.git/blobdiff_plain/c930e9176a5a85509c5b0230e2bff5c22a591432..c8256059947f3aa8f5b0a9a2acf55e2142bb4742:/docs/source/DataProxy.html diff --git a/docs/source/DataProxy.html b/docs/source/DataProxy.html index c37e14a2..0f5b5daa 100644 --- a/docs/source/DataProxy.html +++ b/docs/source/DataProxy.html @@ -1,431 +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'
-    }
-}),
- * 
- */ -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
-}
-
- *

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);
-
-            // manually set the private connection URL.
-            // Warning:  Accessing the private URL property should be avoided.
-            // Use the public method {@link Ext.data.HttpProxy#setUrl setUrl} instead, shown above.
-            // It should be noted that changing the URL like this will affect
-            // the URL for just this request.  Subsequent requests will use the
-            // API or URL defined in your initial proxy configuration.
-            store.proxy.conn.url = 'changed1.php';
-
-            // proxy URL will be superseded by API (only if proxy created to use ajax):
-            // It should be noted that proxy API changes are permanent and will
-            // be used for all subsequent requests.
-            store.proxy.api.load = 'changed2.php';
-
-            // However, altering the proxy API should be done using the public
-            // method {@link Ext.data.DataProxy#setApi setApi} instead.
-            store.proxy.setApi('load', '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'
-            });
-        }
-    }
-});
-     * 
- *

- */ - // 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(); - } - } - - 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. - * This event can be fired for one of two reasons:

- *
- *

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'.

- *
- * @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:

- *
- * @param {Mixed} arg - *

The type and value of this parameter depends on the value of the type parameter:

- *
- */ - '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 - * @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 - * @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); -}; - -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
-    ...
-)}
-     * 
- * 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
-     * 

- */ - 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 Scope with which to call the callback (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 - * (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); - }, - - /** - * 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; - var url = (this.api[action]) ? this.api[action].url : this.url; - if (!url) { - throw new Ext.data.Api.Error('invalid-url', action); - } - - var format = null; - var m = url.match(/(.*)(\.\w+)$/); // <-- look for urls with "provides" suffix, e.g.: /users.json, /users.xml, etc - if (m) { - format = m[2]; - url = m[1]; - } - // prettyUrls is deprectated in favor of restful-config - if ((this.prettyUrls === true || this.restful === true) && record instanceof Ext.data.Record && !record.phantom) { - url += '/' + record.id; - } - if (format) { // <-- append the request format if exists (ie: /users/update/69[.json]) - url += format; - } - return url; - }, - -
/** - * Destroys the proxy by purging any event listeners and cancelling any active requests. - */ - destroy: function(){ - this.purgeListeners(); - } -}); - -
/** - * @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:

+ *
+ *

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'.

+ *
+ * @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:

+ *
+ * @param {Mixed} arg + *

The type and value of this parameter depends on the value of the type parameter:

+ *
+ */ + '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:

+ *

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