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- <title>The source code</title>\r
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- <pre class="prettyprint lang-js"><div id="cls-Ext.data.DataWriter"></div>/**
- * @class Ext.data.DataWriter
- * <p>Ext.data.DataWriter facilitates create, update, and destroy actions between
- * an Ext.data.Store and a server-side framework. A Writer enabled Store will
- * automatically manage the Ajax requests to perform CRUD actions on a Store.</p>
- * <p>Ext.data.DataWriter is an abstract base class which is intended to be extended
- * and should not be created directly. For existing implementations, see
- * {@link Ext.data.JsonWriter}.</p>
- * <p>Creating a writer is simple:</p>
- * <pre><code>
-var writer = new Ext.data.JsonWriter();
- * </code></pre>
- * <p>The proxy for a writer enabled store can be configured with a simple <code>url</code>:</p>
- * <pre><code>
-// Create a standard HttpProxy instance.
-var proxy = new Ext.data.HttpProxy({
- url: 'app.php/users'
-});
- * </code></pre>
- * <p>For finer grained control, the proxy may also be configured with an <code>api</code>:</p>
- * <pre><code>
-// Use the api specification
-var proxy = new Ext.data.HttpProxy({
- api: {
- read : 'app.php/users/read',
- create : 'app.php/users/create',
- update : 'app.php/users/update',
- destroy : 'app.php/users/destroy'
- }
-});
- * </code></pre>
- * <p>Creating a Writer enabled store:</p>
- * <pre><code>
-var store = new Ext.data.Store({
- proxy: proxy,
- reader: reader,
- writer: writer
-});
- * </code></pre>
- * @constructor Create a new DataWriter
- * @param {Object} meta Metadata configuration options (implementation-specific)
- * @param {Object} recordType Either an Array of field definition objects as specified
- * in {@link Ext.data.Record#create}, or an {@link Ext.data.Record} object created
- * using {@link Ext.data.Record#create}.
- */
-Ext.data.DataWriter = function(config){
- <div id="prop-Ext.data.DataWriter-meta"></div>/**
- * This DataWriter's configured metadata as passed to the constructor.
- * @type Mixed
- * @property meta
- */
- Ext.apply(this, config);
-};
-
-Ext.data.DataWriter.prototype = {
-
- <div id="cfg-Ext.data.DataWriter-writeAllFields"></div>/**
- * @cfg {Boolean} writeAllFields
- * <tt>false</tt> by default. Set <tt>true</tt> to have DataWriter return ALL fields of a modified
- * record -- not just those that changed.
- * <tt>false</tt> to have DataWriter only request modified fields from a record.
- */
- writeAllFields : false,
- <div id="cfg-Ext.data.DataWriter-listful"></div>/**
- * @cfg {Boolean} listful
- * <tt>false</tt> by default. Set <tt>true</tt> to have the DataWriter <b>always</b> write HTTP params as a list,
- * even when acting upon a single record.
- */
- listful : false, // <-- listful is actually not used internally here in DataWriter. @see Ext.data.Store#execute.
-
- <div id="method-Ext.data.DataWriter-write"></div>/**
- * Writes data in preparation for server-write action. Simply proxies to DataWriter#update, DataWriter#create
- * DataWriter#destroy.
- * @param {String} action [CREATE|UPDATE|DESTROY]
- * @param {Object} params The params-hash to write-to
- * @param {Record/Record[]} rs The recordset write.
- */
- write : function(action, params, rs) {
- this.render(action, rs, params, this[action](rs));
- },
-
- <div id="method-Ext.data.DataWriter-render"></div>/**
- * abstract method meant to be overridden by all DataWriter extensions. It's the extension's job to apply the "data" to the "params".
- * The data-object provided to render is populated with data according to the meta-info defined in the user's DataReader config,
- * @param {String} action [Ext.data.Api.actions.create|read|update|destroy]
- * @param {Record[]} rs Store recordset
- * @param {Object} params Http params to be sent to server.
- * @param {Object} data object populated according to DataReader meta-data.
- */
- render : Ext.emptyFn,
-
- /**
- * update
- * @param {Object} p Params-hash to apply result to.
- * @param {Record/Record[]} rs Record(s) to write
- * @private
- */
- update : function(rs) {
- var params = {};
- if (Ext.isArray(rs)) {
- var data = [],
- ids = [];
- Ext.each(rs, function(val){
- ids.push(val.id);
- data.push(this.updateRecord(val));
- }, this);
- params[this.meta.idProperty] = ids;
- params[this.meta.root] = data;
- }
- else if (rs instanceof Ext.data.Record) {
- //params[this.meta.idProperty] = rs.id; // <-- removed, un-neccessary.
- params[this.meta.root] = this.updateRecord(rs);
- }
- return params;
- },
-
- <div id="cfg-Ext.data.DataWriter-saveRecord"></div>/**
- * @cfg {Function} saveRecord Abstract method that should be implemented in all subclasses
- * (e.g.: {@link Ext.data.JsonWriter#saveRecord JsonWriter.saveRecord}
- */
- updateRecord : Ext.emptyFn,
-
- /**
- * create
- * @param {Object} p Params-hash to apply result to.
- * @param {Record/Record[]} rs Record(s) to write
- * @private
- */
- create : function(rs) {
- var params = {};
- if (Ext.isArray(rs)) {
- var data = [];
- Ext.each(rs, function(val){
- data.push(this.createRecord(val));
- }, this);
- params[this.meta.root] = data;
- }
- else if (rs instanceof Ext.data.Record) {
- params[this.meta.root] = this.createRecord(rs);
- }
- return params;
- },
-
- <div id="cfg-Ext.data.DataWriter-createRecord"></div>/**
- * @cfg {Function} createRecord Abstract method that should be implemented in all subclasses
- * (e.g.: {@link Ext.data.JsonWriter#createRecord JsonWriter.createRecord})
- */
- createRecord : Ext.emptyFn,
-
- /**
- * destroy
- * @param {Object} p Params-hash to apply result to.
- * @param {Record/Record[]} rs Record(s) to write
- * @private
- */
- destroy : function(rs) {
- var params = {};
- if (Ext.isArray(rs)) {
- var data = [],
- ids = [];
- Ext.each(rs, function(val){
- data.push(this.destroyRecord(val));
- }, this);
- params[this.meta.root] = data;
- } else if (rs instanceof Ext.data.Record) {
- params[this.meta.root] = this.destroyRecord(rs);
- }
- return params;
- },
-
- <div id="cfg-Ext.data.DataWriter-destroyRecord"></div>/**
- * @cfg {Function} destroyRecord Abstract method that should be implemented in all subclasses
- * (e.g.: {@link Ext.data.JsonWriter#destroyRecord JsonWriter.destroyRecord})
- */
- destroyRecord : Ext.emptyFn,
-
- /**
- * Converts a Record to a hash
- * @param {Record}
- * @private
- */
- toHash : function(rec) {
- var map = rec.fields.map,
- data = {},
- raw = (this.writeAllFields === false && rec.phantom === false) ? rec.getChanges() : rec.data,
- m;
- Ext.iterate(raw, function(prop, value){
- if((m = map[prop])){
- data[m.mapping ? m.mapping : m.name] = value;
- }
- });
- data[this.meta.idProperty] = rec.id;
- return data;
- }
-};</pre> \r
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