X-Git-Url: http://git.ithinksw.org/extjs.git/blobdiff_plain/ee06f37b0f6f6d94cd05a6ffae556660f7c4a2bc..c930e9176a5a85509c5b0230e2bff5c22a591432:/src/data/HttpProxy.js?ds=sidebyside diff --git a/src/data/HttpProxy.js b/src/data/HttpProxy.js new file mode 100644 index 00000000..19eff36d --- /dev/null +++ b/src/data/HttpProxy.js @@ -0,0 +1,276 @@ +/*! + * Ext JS Library 3.0.0 + * Copyright(c) 2006-2009 Ext JS, LLC + * licensing@extjs.com + * http://www.extjs.com/license + */ +/** + * @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, beforesave, etc). The connection url will be nullified + // after each request as well. Url is always re-defined during doRequest. + this.conn.url = null; + + this.useAjax = !conn || !conn.events; + + //private. 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, { + /** + * @cfg {Boolean} restful + *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 (defaults to false).
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}.
Some MVC (e.g., Ruby on Rails, Merb and Django) support this style of 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: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'
+}
+ */
+
+ /**
+ * 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;
+ 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 in which to call the callback
+ * @param {Object} arg An optional argument which is passed to the callback as its second parameter.
+ */
+ 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
+ };
+ // Sample the request data: If it's an object, then it hasn't been json-encoded yet.
+ // Transmit data using jsonData config of Ext.Ajax.request
+ if (typeof(params[reader.meta.root]) === 'object') {
+ o.jsonData = params;
+ } else {
+ o.params = params || {};
+ }
+ // Set the connection url. If this.conn.url is not null here,
+ // the user may have overridden the url during a beforeaction event-handler.
+ // this.conn.url is nullified after each request.
+ if (this.conn.url === null) {
+ this.conn.url = this.buildUrl(action, rs);
+ }
+ else if (this.restful === true && rs instanceof Ext.data.Record && !rs.phantom) {
+ this.conn.url += '/' + rs.id;
+ }
+ 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
+ //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.
+ 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
+ * @private
+ */
+ onRead : function(action, o, response) {
+ var result;
+ try {
+ result = o.reader.read(response);
+ }catch(e){
+ // @deprecated: fire old loadexception for backwards-compat.
+ 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.
+ 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);
+ }
+ 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
+ * @private
+ */
+ 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[reader.meta.successProperty] === false) {
+ this.fireEvent('exception', this, 'remote', action, o, res, rs);
+ } else {
+ this.fireEvent('write', this, action, res[reader.meta.root], res, rs, o.request.arg);
+ }
+ o.request.callback.call(o.request.scope, res[reader.meta.root], res, res[reader.meta.successProperty]);
+ },
+
+ // 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);
+ }
+});
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