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* Ext JS Library 3.0 RC2
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* Copyright(c) 2006-2009, Ext JS, LLC.
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* http://extjs.com/license
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* Ext.data.Api is a singleton designed to manage the data API including methods for validating
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* a developer's DataProxy API. Defines variables for CRUD actions create, read, update and destroy in addition to a
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* mapping of RESTful HTTP methods GET, POST, PUT and DELETE to CRUD actions.
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Ext.data.Api = (function() {
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// private validActions. validActions is essentially an inverted hash of Ext.data.Api.actions, where value becomes the key.
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// Some methods in this singleton (eg: getActions, getVerb) will loop through actions with the code <code>for (var verb in this.actions)</code>
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// For efficiency, some methods will first check this hash for a match. Those methods which do acces validActions will cache their result here.
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// We cannot pre-define this hash since the developer may over-ride the actions at runtime.
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var validActions = {};
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* Defined actions corresponding to remote actions:
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create : 'create', // Text representing the remote-action to create records on server.
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read : 'read', // Text representing the remote-action to read/load data from server.
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update : 'update', // Text representing the remote-action to update records on server.
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destroy : 'destroy' // Text representing the remote-action to destroy records on server.
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* Defined {CRUD action}:{HTTP method} pairs corresponding to remote actions for RESTful proxies.
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* Returns true if supplied action-name is a valid API action defined in <code>{@link #actions}</code> constants
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* @param {String} action
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* @param {String[]}(Optional) List of available CRUD actions. Pass in list when executing multiple times for efficiency.
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isAction : function(action) {
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return (Ext.data.Api.actions[action]) ? true : false;
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* Returns the actual CRUD action KEY "create", "read", "update" or "destroy" from the supplied action-name. This method is used internally and shouldn't generally
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* need to be used directly. The key/value pair of Ext.data.Api.actions will often be identical but this is not necessarily true. A developer can override this naming
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* convention if desired. However, the framework internally calls methods based upon the KEY so a way of retreiving the the words "create", "read", "update" and "destroy" is
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* required. This method will cache discovered KEYS into the private validActions hash.
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* @param {String} name The runtime name of the action.
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* @return {String||null} returns the action-key, or verb of the user-action or null if invalid.
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getVerb : function(name) {
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if (validActions[name]) {
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return validActions[name]; // <-- found in cache. return immediately.
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for (var verb in this.actions) {
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if (this.actions[verb] === name) {
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validActions[name] = verb;
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return (validActions[name] !== undefined) ? validActions[name] : null;
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* Returns true if the supplied API is valid; that is, check that all keys match defined actions
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* otherwise returns an array of mistakes.
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* @return {String[]||true}
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isValid : function(api){
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var crud = this.actions; // <-- cache a copy of the actions.
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for (var action in api) {
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if (!(action in crud)) {
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invalid.push(action);
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return (!invalid.length) ? true : invalid;
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* Returns true if the supplied verb upon the supplied proxy points to a unique url in that none of the other api-actions
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* point to the same url. The question is important for deciding whether to insert the "xaction" HTTP parameter within an
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* Ajax request. This method is used internally and shouldn't generally need to be called directly.
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* @param {Ext.data.DataProxy} proxy
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* @param {String} verb
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hasUniqueUrl : function(proxy, verb) {
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var url = (proxy.api[verb]) ? proxy.api[verb].url : null;
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for (var action in proxy.api) {
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if ((unique = (action === verb) ? true : (proxy.api[action].url != url) ? true : false) === false) {
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* This method is used internally by <tt>{@link Ext.data.DataProxy DataProxy}</tt> and should not generally need to be used directly.
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* Each action of a DataProxy api can be initially defined as either a String or an Object. When specified as an object,
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* one can explicitly define the HTTP method (GET|POST) to use for each CRUD action. This method will prepare the supplied API, setting
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* each action to the Object form. If your API-actions do not explicitly define the HTTP method, the "method" configuration-parameter will
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* be used. If the method configuration parameter is not specified, POST will be used.
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new Ext.data.HttpProxy({
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method: "POST", // <-- default HTTP method when not specified.
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create: 'create.php',
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destroy: 'destroy.php'
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// Alternatively, one can use the object-form to specify the API
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new Ext.data.HttpProxy({
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load: {url: 'read.php', method: 'GET'},
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create: 'create.php',
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destroy: 'destroy.php',
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* @param {Ext.data.DataProxy} proxy
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prepare : function(proxy) {
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proxy.api = {}; // <-- No api? create a blank one.
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for (var verb in this.actions) {
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var action = this.actions[verb];
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proxy.api[action] = proxy.api[action] || proxy.url || proxy.directFn;
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if (typeof(proxy.api[action]) == 'string') {
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proxy.api[action] = {
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url: proxy.api[action]
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* Prepares a supplied Proxy to be RESTful. Sets the HTTP method for each api-action to be one of
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* GET, POST, PUT, DELETE according to the defined {@link #restActions}.
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* @param {Ext.data.DataProxy} proxy
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restify : function(proxy) {
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proxy.restful = true;
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for (var verb in this.restActions) {
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proxy.api[this.actions[verb]].method = this.restActions[verb];
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* Error class for Ext.data.Api errors.
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Ext.data.Api.Error = Ext.extend(Ext.Error, {
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constructor : function(message, arg) {
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Ext.Error.call(this, message);
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Ext.apply(Ext.data.Api.Error.prototype, {
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'action-url-undefined': 'No fallback url defined for this action. When defining a DataProxy api, please be sure to define an url for each CRUD action in Ext.data.Api.actions or define a default url in addition to your api-configuration.',
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'invalid': 'received an invalid API-configuration. Please ensure your proxy API-configuration contains only the actions defined in Ext.data.Api.actions',
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'invalid-url': 'Invalid url. Please review your proxy configuration.',
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'execute': 'Attempted to execute an unknown action. Valid API actions are defined in Ext.data.Api.actions"'