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YUI.add('datasource-get', function (Y, NAME) {
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/**
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* Provides a DataSource implementation which can be used to retrieve data via the Get Utility.
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*
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* @module datasource
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* @submodule datasource-get
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*/
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/**
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* Get Utility subclass for the DataSource Utility.
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* @class DataSource.Get
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* @extends DataSource.Local
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* @constructor
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*/
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var DSGet = function() {
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DSGet.superclass.constructor.apply(this, arguments);
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};
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Y.DataSource.Get = Y.extend(DSGet, Y.DataSource.Local, {
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/**
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* Passes query string to Get Utility. Fires <code>response</code> event when
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* response is received asynchronously.
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*
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* @method _defRequestFn
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* @param e {EventFacade} Event Facade with the following properties:
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* <dl>
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* <dt>tId (Number)</dt> <dd>Unique transaction ID.</dd>
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* <dt>request (Object)</dt> <dd>The request.</dd>
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* <dt>callback (Object)</dt> <dd>The callback object with the following properties:
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* <dl>
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* <dt>success (Function)</dt> <dd>Success handler.</dd>
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* <dt>failure (Function)</dt> <dd>Failure handler.</dd>
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* </dl>
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* </dd>
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* <dt>cfg (Object)</dt> <dd>Configuration object.</dd>
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* </dl>
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* @protected
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*/
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_defRequestFn: function(e) {
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var uri = this.get("source"),
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get = this.get("get"),
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guid = Y.guid().replace(/\-/g, '_'),
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generateRequest = this.get( "generateRequestCallback" ),
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payload = e.details[0],
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self = this;
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/**
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* Stores the most recent request id for validation against stale
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* response handling.
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*
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* @property _last
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* @type {String}
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* @protected
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*/
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this._last = guid;
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// Dynamically add handler function with a closure to the callback stack
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// for access to guid
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YUI.Env.DataSource.callbacks[guid] = function(response) {
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delete YUI.Env.DataSource.callbacks[guid];
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delete Y.DataSource.Local.transactions[e.tId];
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var process = self.get('asyncMode') !== "ignoreStaleResponses" ||
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self._last === guid;
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if (process) {
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payload.data = response;
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self.fire("data", payload);
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} else {
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}
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};
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// Add the callback param to the request url
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uri += e.request + generateRequest.call( this, guid );
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Y.DataSource.Local.transactions[e.tId] = get.script(uri, {
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autopurge: true,
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// Works in Firefox only....
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onFailure: function (o) {
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delete YUI.Env.DataSource.callbacks[guid];
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delete Y.DataSource.Local.transactions[e.tId];
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payload.error = new Error(o.msg || "Script node data failure");
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self.fire("data", payload);
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},
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onTimeout: function(o) {
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delete YUI.Env.DataSource.callbacks[guid];
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delete Y.DataSource.Local.transactions[e.tId];
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payload.error = new Error(o.msg || "Script node data timeout");
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self.fire("data", payload);
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}
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});
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return e.tId;
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},
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/**
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* Default method for adding callback param to url. See
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* generateRequestCallback attribute.
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*
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* @method _generateRequest
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* @param guid {String} unique identifier for callback function wrapper
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* @protected
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*/
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_generateRequest: function (guid) {
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return "&" + this.get("scriptCallbackParam") +
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"=YUI.Env.DataSource.callbacks." + guid;
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}
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}, {
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/**
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* Class name.
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*
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* @property NAME
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* @type String
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* @static
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* @final
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* @value "dataSourceGet"
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*/
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NAME: "dataSourceGet",
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////////////////////////////////////////////////////////////////////////////
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//
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// DataSource.Get Attributes
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//
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////////////////////////////////////////////////////////////////////////////
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ATTRS: {
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/**
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* Pointer to Get Utility.
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*
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* @attribute get
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* @type Y.Get
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* @default Y.Get
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*/
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get: {
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value: Y.Get,
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cloneDefaultValue: false
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},
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/**
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* Defines request/response management in the following manner:
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* <dl>
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* <!--<dt>queueRequests</dt>
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* <dd>If a request is already in progress, wait until response is
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* returned before sending the next request.</dd>
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* <dt>cancelStaleRequests</dt>
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* <dd>If a request is already in progress, cancel it before
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* sending the next request.</dd>-->
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* <dt>ignoreStaleResponses</dt>
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* <dd>Send all requests, but handle only the response for the most
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* recently sent request.</dd>
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* <dt>allowAll</dt>
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* <dd>Send all requests and handle all responses.</dd>
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* </dl>
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*
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* @attribute asyncMode
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* @type String
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* @default "allowAll"
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*/
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asyncMode: {
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value: "allowAll"
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},
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/**
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* Callback string parameter name sent to the remote script. By default,
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* requests are sent to
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* <URI>?<scriptCallbackParam>=callbackFunction
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*
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* @attribute scriptCallbackParam
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* @type String
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* @default "callback"
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*/
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scriptCallbackParam : {
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value: "callback"
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},
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/**
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* Accepts the DataSource instance and a callback ID, and returns a callback
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* param/value string that gets appended to the script URI. Implementers
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* can customize this string to match their server's query syntax.
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*
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* @attribute generateRequestCallback
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* @type Function
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*/
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generateRequestCallback : {
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value: function () {
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return this._generateRequest.apply(this, arguments);
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}
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}
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}
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});
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YUI.namespace("Env.DataSource.callbacks");
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}, '3.18.1', {"requires": ["datasource-local", "get"]});
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