The source code

/** * @class Ext.data.HttpProxy * @extends Ext.data.DataProxy *

An implementation of {@link Ext.data.DataProxy} that processes data requests within the same * domain of the originating page.

Note: this class cannot be used to retrieve data from a domain other * than the domain from which the running page was served. For cross-domain requests, use a * {@link Ext.data.ScriptTagProxy ScriptTagProxy}.

Be aware that to enable the browser to parse an XML document, the server must set * the Content-Type header in the HTTP response to "text/xml".

* @constructor * @param {Object} conn * An {@link Ext.data.Connection} object, or options parameter to {@link Ext.Ajax#request}. *

Note that if this HttpProxy is being used by a {@link Ext.data.Store Store}, then the * Store's call to {@link #load} will override any specified callback and params * options. In this case, use the Store's {@link Ext.data.Store#events events} to modify parameters, * or react to loading events. The Store's {@link Ext.data.Store#baseParams baseParams} may also be * used to pass parameters known at instantiation time.

If an options parameter is passed, the singleton {@link Ext.Ajax} object will be used to make * the request.

*/ Ext.data.HttpProxy = function(conn){ Ext.data.HttpProxy.superclass.constructor.call(this, conn);

/** * The Connection object (Or options parameter to {@link Ext.Ajax#request}) which this HttpProxy * uses to make requests to the server. Properties of this object may be changed dynamically to * change the way data is requested. * @property */ this.conn = conn; // nullify the connection url. The url param has been copied to 'this' above. The connection // url will be set during each execution of doRequest when buildUrl is called. This makes it easier for users to override the // connection url during beforeaction events (ie: beforeload, beforewrite, etc). // Url is always re-defined during doRequest. this.conn.url = null; this.useAjax = !conn || !conn.events; // A hash containing active requests, keyed on action [Ext.data.Api.actions.create|read|update|destroy] var actions = Ext.data.Api.actions; this.activeRequest = {}; for (var verb in actions) { this.activeRequest[actions[verb]] = undefined; } }; Ext.extend(Ext.data.HttpProxy, Ext.data.DataProxy, {

/** * Return the {@link Ext.data.Connection} object being used by this Proxy. * @return {Connection} The Connection object. This object may be used to subscribe to events on * a finer-grained basis than the DataProxy events. */ getConnection : function() { return this.useAjax ? Ext.Ajax : this.conn; },

/** * Used for overriding the url used for a single request. Designed to be called during a beforeaction event. Calling setUrl * will override any urls set via the api configuration parameter. Set the optional parameter makePermanent to set the url for * all subsequent requests. If not set to makePermanent, the next request will use the same url or api configuration defined * in the initial proxy configuration. * @param {String} url * @param {Boolean} makePermanent (Optional) [false] * * (e.g.: beforeload, beforesave, etc). */ setUrl : function(url, makePermanent) { this.conn.url = url; if (makePermanent === true) { this.url = url; this.api = null; Ext.data.Api.prepare(this); } },

/** * HttpProxy implementation of DataProxy#doRequest * @param {String} action The crud action type (create, read, update, destroy) * @param {Ext.data.Record/Ext.data.Record[]} rs If action is load, rs will be null * @param {Object} params An object containing properties which are to be used as HTTP parameters * for the request to the remote server. * @param {Ext.data.DataReader} reader The Reader object which converts the data * object into a block of Ext.data.Records. * @param {Function} callback *

A function to be called after the request. * The callback is passed the following arguments:

r : Ext.data.Record[] The block of Ext.data.Records.
options: Options object from the action request
success: Boolean success indicator

* @param {Object} scope The scope (this reference) in which the callback function is executed. Defaults to the browser window. * @param {Object} arg An optional argument which is passed to the callback as its second parameter. * @protected */ doRequest : function(action, rs, params, reader, cb, scope, arg) { var o = { method: (this.api[action]) ? this.api[action]['method'] : undefined, request: { callback : cb, scope : scope, arg : arg }, reader: reader, callback : this.createCallback(action, rs), scope: this }; // If possible, transmit data using jsonData || xmlData on Ext.Ajax.request (An installed DataWriter would have written it there.). // Use std HTTP params otherwise. if (params.jsonData) { o.jsonData = params.jsonData; } else if (params.xmlData) { o.xmlData = params.xmlData; } else { o.params = params || {}; } // Set the connection url. If this.conn.url is not null here, // the user must have overridden the url during a beforewrite/beforeload event-handler. // this.conn.url is nullified after each request. this.conn.url = this.buildUrl(action, rs); if(this.useAjax){ Ext.applyIf(o, this.conn); // If a currently running request is found for this action, abort it. if (this.activeRequest[action]) { //// // Disabled aborting activeRequest while implementing REST. activeRequest[action] will have to become an array // TODO ideas anyone? // //Ext.Ajax.abort(this.activeRequest[action]); } this.activeRequest[action] = Ext.Ajax.request(o); }else{ this.conn.request(o); } // request is sent, nullify the connection url in preparation for the next request this.conn.url = null; }, /** * Returns a callback function for a request. Note a special case is made for the * read action vs all the others. * @param {String} action [create|update|delete|load] * @param {Ext.data.Record[]} rs The Store-recordset being acted upon * @private */ createCallback : function(action, rs) { return function(o, success, response) { this.activeRequest[action] = undefined; if (!success) { if (action === Ext.data.Api.actions.read) { // @deprecated: fire loadexception for backwards compat. // TODO remove this.fireEvent('loadexception', this, o, response); } this.fireEvent('exception', this, 'response', action, o, response); o.request.callback.call(o.request.scope, null, o.request.arg, false); return; } if (action === Ext.data.Api.actions.read) { this.onRead(action, o, response); } else { this.onWrite(action, o, response, rs); } }; },

/** * Callback for read 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 : function(action, o, response) { var result; try { result = o.reader.read(response); }catch(e){ // @deprecated: fire old loadexception for backwards-compat. // TODO remove this.fireEvent('loadexception', this, o, response, e); this.fireEvent('exception', this, 'response', action, o, response, e); o.request.callback.call(o.request.scope, null, o.request.arg, false); return; } if (result.success === false) { // @deprecated: fire old loadexception for backwards-compat. // TODO remove this.fireEvent('loadexception', this, o, response); // Get DataReader read-back a response-object to pass along to exception event var res = o.reader.readResponse(action, response); this.fireEvent('exception', this, 'remote', action, o, res, null); } else { this.fireEvent('load', this, o, o.request.arg); } // TODO refactor onRead, onWrite to be more generalized now that we're dealing with Ext.data.Response instance // the calls to request.callback(...) in each will have to be made identical. // NOTE reader.readResponse does not currently return Ext.data.Response o.request.callback.call(o.request.scope, result, o.request.arg, result.success); },

/** * Callback for write 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 : function(action, o, response, rs) { var reader = o.reader; var res; try { res = reader.readResponse(action, response); } catch (e) { this.fireEvent('exception', this, 'response', action, o, response, e); o.request.callback.call(o.request.scope, null, o.request.arg, false); return; } if (res.success === true) { this.fireEvent('write', this, action, res.data, res, rs, o.request.arg); } else { this.fireEvent('exception', this, 'remote', action, o, res, rs); } // TODO refactor onRead, onWrite to be more generalized now that we're dealing with Ext.data.Response instance // the calls to request.callback(...) in each will have to be made similar. // NOTE reader.readResponse does not currently return Ext.data.Response o.request.callback.call(o.request.scope, res.data, res, res.success); }, // inherit docs destroy: function(){ if(!this.useAjax){ this.conn.abort(); }else if(this.activeRequest){ var actions = Ext.data.Api.actions; for (var verb in actions) { if(this.activeRequest[actions[verb]]){ Ext.Ajax.abort(this.activeRequest[actions[verb]]); } } } Ext.data.HttpProxy.superclass.destroy.call(this); } });