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<title>The source code</title>
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<pre class="prettyprint lang-js">/*!
* Ext JS Library 3.4.0
* Copyright(c) 2006-2011 Sencha Inc.
* licensing@sencha.com
* http://www.sencha.com/license
*/
<div id="cls-Ext.data.DataProxy"></div>/**
* @class Ext.data.DataProxy
* @extends Ext.util.Observable
* <p>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}.</p>
* <p>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}.</p>
* <p>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}.</p>
* <p>Custom implementations must implement either the <code><b>doRequest</b></code> method (preferred) or the
* <code>load</code> 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.</p>
* <p><b><u>Example 1</u></b></p>
* <pre><code>
proxy: new Ext.data.ScriptTagProxy({
{@link Ext.data.Connection#url url}: 'http://extjs.com/forum/topics-remote.php'
}),
* </code></pre>
* <p><b><u>Example 2</u></b></p>
* <pre><code>
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'
}
}),
* </code></pre>
* <p>And <b>new in Ext version 3</b>, attach centralized event-listeners upon the DataProxy class itself! This is a great place
* to implement a <i>messaging system</i> to centralize your application's user-feedback and error-handling.</p>
* <pre><code>
// 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, exception) {
console.error(type + action + ' exception);
});
* </code></pre>
* <b>Note:</b> These three events are all fired with the signature of the corresponding <i>DataProxy instance</i> 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;
<div id="cfg-Ext.data.DataProxy-api"></div>/**
* @cfg {Object} api
* Specific urls to call on CRUD action methods "read", "create", "update" and "destroy".
* Defaults to:<pre><code>
api: {
read : undefined,
create : undefined,
update : undefined,
destroy : undefined
}
* </code></pre>
* <p>The url is built based upon the action being executed <tt>[load|create|save|destroy]</tt>
* using the commensurate <tt>{@link #api}</tt> property, or if undefined default to the
* configured {@link Ext.data.Store}.{@link Ext.data.Store#url url}.</p><br>
* <p>For example:</p>
* <pre><code>
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'
}
* </code></pre>
* <p>If the specific URL for a given CRUD action is undefined, the CRUD action request
* will be directed to the configured <tt>{@link Ext.data.Connection#url url}</tt>.</p>
* <br><p><b>Note</b>: 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:
* <pre><code>
// modify the url for the action
myStore.on({
beforeload: {
fn: function (store, options) {
// use <tt>{@link Ext.data.HttpProxy#setUrl setUrl}</tt> 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 <tt>{@link Ext.data.DataProxy#setApi setApi}</tt>.
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 <b>entire</b>
// 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'
});
}
}
});
* </code></pre>
* </p>
*/
this.addEvents(
<div id="event-Ext.data.DataProxy-exception"></div>/**
* @event exception
* <p>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.</p>
* <p>In addition to being fired through the DataProxy instance that raised the event, this event is also fired
* through the Ext.data.DataProxy <i>class</i> to allow for centralized processing of exception events from <b>all</b>
* DataProxies by attaching a listener to the Ext.data.DataProxy class itself.</p>
* <p>This event can be fired for one of two reasons:</p>
* <div class="mdetail-params"><ul>
* <li>remote-request <b>failed</b> : <div class="sub-desc">
* The server did not return status === 200.
* </div></li>
* <li>remote-request <b>succeeded</b> : <div class="sub-desc">
* 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.
* </div></li>
* </ul></div>
* <br><p>This event fires with two different contexts based upon the 2nd
* parameter <tt>type [remote|response]</tt>. The first four parameters
* are identical between the two contexts -- only the final two parameters
* differ.</p>
* @param {DataProxy} this The proxy that sent the request
* @param {String} type
* <p>The value of this parameter will be either <tt>'response'</tt> or <tt>'remote'</tt>.</p>
* <div class="mdetail-params"><ul>
* <li><b><tt>'response'</tt></b> : <div class="sub-desc">
* <p>An <b>invalid</b> 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).</p>
* </div></li>
* <li><b><tt>'remote'</tt></b> : <div class="sub-desc">
* <p>A <b>valid</b> 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.</p>
* </div></li>
* </ul></div>
* @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
* <p>The value of this parameter depends on the value of the <code>type</code> parameter:</p>
* <div class="mdetail-params"><ul>
* <li><b><tt>'response'</tt></b> : <div class="sub-desc">
* <p>The raw browser response object (e.g.: XMLHttpRequest)</p>
* </div></li>
* <li><b><tt>'remote'</tt></b> : <div class="sub-desc">
* <p>The decoded response object sent from the server.</p>
* </div></li>
* </ul></div>
* @param {Mixed} arg
* <p>The type and value of this parameter depends on the value of the <code>type</code> parameter:</p>
* <div class="mdetail-params"><ul>
* <li><b><tt>'response'</tt></b> : Error<div class="sub-desc">
* <p>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.</p>
* </div></li>
* <li><b><tt>'remote'</tt></b> : Record/Record[]<div class="sub-desc">
* <p>This parameter will only exist if the <tt>action</tt> was a <b>write</b> action
* (Ext.data.Api.actions.create|update|destroy).</p>
* </div></li>
* </ul></div>
*/
'exception',
<div id="event-Ext.data.DataProxy-beforeload"></div>/**
* @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',
<div id="event-Ext.data.DataProxy-load"></div>/**
* @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 <tt>options</tt> property as passed to the {@link #request} function
*/
'load',
<div id="event-Ext.data.DataProxy-loadexception"></div>/**
* @event loadexception
* <p>This event is <b>deprecated</b>. 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.</p>
* @param {misc} misc See {@link #exception}.
* @deprecated
*/
'loadexception',
<div id="event-Ext.data.DataProxy-beforewrite"></div>/**
* @event beforewrite
* <p>Fires before a request is generated for one of the actions Ext.data.Api.actions.create|update|destroy</p>
* <p>In addition to being fired through the DataProxy instance that raised the event, this event is also fired
* through the Ext.data.DataProxy <i>class</i> to allow for centralized processing of beforewrite events from <b>all</b>
* DataProxies by attaching a listener to the Ext.data.DataProxy class itself.</p>
* @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 <code>params</code> object. Edit <code>params</code> to add parameters to the request.
*/
'beforewrite',
<div id="event-Ext.data.DataProxy-write"></div>/**
* @event write
* <p>Fires before the request-callback is called</p>
* <p>In addition to being fired through the DataProxy instance that raised the event, this event is also fired
* through the Ext.data.DataProxy <i>class</i> to allow for centralized processing of write events from <b>all</b>
* DataProxies by attaching a listener to the Ext.data.DataProxy class itself.</p>
* @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 <tt>options</tt> 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, {
<div id="cfg-Ext.data.DataProxy-restful"></div>/**
* @cfg {Boolean} restful
* <p>Defaults to <tt>false</tt>. Set to <tt>true</tt> to operate in a RESTful manner.</p>
* <br><p> Note: this parameter will automatically be set to <tt>true</tt> if the
* {@link Ext.data.Store} it is plugged into is set to <code>restful: true</code>. If the
* Store is RESTful, there is no need to set this option on the proxy.</p>
* <br><p>RESTful implementations enable the serverside framework to automatically route
* actions sent to one url based upon the HTTP method, for example:
* <pre><code>
store: new Ext.data.Store({
restful: true,
proxy: new Ext.data.HttpProxy({url:'/users'}); // all requests sent to /users
...
)}
* </code></pre>
* If there is no <code>{@link #api}</code> 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:
* <pre>
<u>Method</u> <u>url</u> <u>action</u>
POST /users create
GET /users read
PUT /users/23 update
DESTROY /users/23 delete
* </pre></p>
* <p>If set to <tt>true</tt>, 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:<pre><code>
* someSite.com/controller/action/id
* </code></pre>
* Where the segments in the url are typically:<div class="mdetail-params"><ul>
* <li>The first segment : represents the controller class that should be invoked.</li>
* <li>The second segment : represents the class function, or method, that should be called.</li>
* <li>The third segment : represents the ID (a variable typically passed to the method).</li>
* </ul></div></p>
* <br><p>Refer to <code>{@link Ext.data.DataProxy#api}</code> for additional information.</p>
*/
restful: false,
<div id="method-Ext.data.DataProxy-setApi"></div>/**
* <p>Redefines the Proxy's API or a single action of an API. Can be called with two method signatures.</p>
* <p>If called with an object as the only parameter, the object should redefine the <b>entire</b> API, e.g.:</p><pre><code>
proxy.setApi({
read : '/users/read',
create : '/users/create',
update : '/users/update',
destroy : '/users/destroy'
});
</code></pre>
* <p>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.:</p><pre><code>
proxy.setApi(Ext.data.Api.actions.read, '/users/new_load_url');
</code></pre>
* @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);
},
<div id="method-Ext.data.DataProxy-isApiAction"></div>/**
* 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;
},
<div id="method-Ext.data.DataProxy-request"></div>/**
* 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 (<code>this</code> 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);
}
},
<div id="method-Ext.data.DataProxy-load"></div>/**
* <b>Deprecated</b> 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,
<div id="cfg-Ext.data.DataProxy-doRequest"></div>/**
* @cfg {Function} doRequest Abstract method that should be implemented in all subclasses. <b>Note:</b> 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);
},
<div id="cfg-Ext.data.DataProxy-onRead"></div>/**
* @cfg {Function} onRead Abstract method that should be implemented in all subclasses. <b>Note:</b> 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,
<div id="cfg-Ext.data.DataProxy-onWrite"></div>/**
* @cfg {Function} onWrite Abstract method that should be implemented in all subclasses. <b>Note:</b> Should only be used by custom-proxy developers. Callback for <i>create, update and destroy</i> {@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;
},
<div id="method-Ext.data.DataProxy-destroy"></div>/**
* 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);
<div id="cls-Ext.data.DataProxy.Error"></div>/**
* @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.'
}
});
</pre>
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