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<h3>datasource&nbsp; <span class="subtitle">3.0.0b1</span></h3>
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<div class="highlight" ><pre><span class="c">/**</span>
<span class="c"> * The DataSource utility provides a common configurable interface for widgets to</span>
<span class="c"> * access a variety of data, from JavaScript arrays to online database servers.</span>
<span class="c"> *</span>
<span class="c"> * @module datasource</span>
<span class="c"> */</span>
<span class="c">/**</span>
<span class="c"> * Dynamic script node subclass for the YUI DataSource utility.</span>
<span class="c"> * @class DataSource.ScriptNode</span>
<span class="c"> * @extends DataSource.Local</span>
<span class="c"> * @constructor</span>
<span class="c"> */</span>
<span class="k">var</span> <span class="nx">DSSN</span> <span class="o">=</span> <span class="k">function</span><span class="o">()</span> <span class="o">{</span>
<span class="nx">DSSN</span><span class="o">.</span><span class="nx">superclass</span><span class="o">.</span><span class="nx">constructor</span><span class="o">.</span><span class="nx">apply</span><span class="o">(</span><span class="k">this</span><span class="o">,</span> <span class="nx">arguments</span><span class="o">);</span>
<span class="o">};</span>
<span class="c">/////////////////////////////////////////////////////////////////////////////</span>
<span class="c"></span> <span class="c">//</span>
<span class="c"></span> <span class="c">// DataSource.ScriptNode static properties</span>
<span class="c"></span> <span class="c">//</span>
<span class="c"></span> <span class="c">/////////////////////////////////////////////////////////////////////////////</span>
<span class="c"></span><span class="nx">Y</span><span class="o">.</span><span class="nx">mix</span><span class="o">(</span><span class="nx">DSSN</span><span class="o">,</span> <span class="o">{</span>
<span class="c">/**</span>
<span class="c"> * Class name.</span>
<span class="c"> *</span>
<span class="c"> * @property NAME</span>
<span class="c"> * @type String</span>
<span class="c"> * @static </span>
<span class="c"> * @final</span>
<span class="c"> * @value &quot;dataSourceScriptNode&quot;</span>
<span class="c"> */</span>
<span class="nx">NAME</span><span class="o">:</span> <span class="s2">&quot;dataSourceScriptNode&quot;</span><span class="o">,</span>
<span class="c">/////////////////////////////////////////////////////////////////////////////</span>
<span class="c"></span> <span class="c">//</span>
<span class="c"></span> <span class="c">// DataSource.ScriptNode Attributes</span>
<span class="c"></span> <span class="c">//</span>
<span class="c"></span> <span class="c">/////////////////////////////////////////////////////////////////////////////</span>
<span class="c"></span>
<span class="nx">ATTRS</span><span class="o">:</span> <span class="o">{</span>
<span class="c">/**</span>
<span class="c"> * Pointer to Get Utility.</span>
<span class="c"> *</span>
<span class="c"> * @attribute get</span>
<span class="c"> * @type Y.Get</span>
<span class="c"> * @default Y.Get</span>
<span class="c"> */</span>
<span class="nx">get</span><span class="o">:</span> <span class="o">{</span>
<span class="nx">value</span><span class="o">:</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">Get</span><span class="o">,</span>
<span class="nx">cloneDefaultValue</span><span class="o">:</span> <span class="kc">false</span>
<span class="o">},</span>
<span class="c">/**</span>
<span class="c"> * Defines request/response management in the following manner:</span>
<span class="c"> * &lt;dl&gt;</span>
<span class="c"> * &lt;!--&lt;dt&gt;queueRequests&lt;/dt&gt;</span>
<span class="c"> * &lt;dd&gt;If a request is already in progress, wait until response is returned before sending the next request.&lt;/dd&gt;</span>
<span class="c"> * &lt;dt&gt;cancelStaleRequests&lt;/dt&gt;</span>
<span class="c"> * &lt;dd&gt;If a request is already in progress, cancel it before sending the next request.&lt;/dd&gt;--&gt;</span>
<span class="c"> * &lt;dt&gt;ignoreStaleResponses&lt;/dt&gt;</span>
<span class="c"> * &lt;dd&gt;Send all requests, but handle only the response for the most recently sent request.&lt;/dd&gt;</span>
<span class="c"> * &lt;dt&gt;allowAll&lt;/dt&gt;</span>
<span class="c"> * &lt;dd&gt;Send all requests and handle all responses.&lt;/dd&gt;</span>
<span class="c"> * &lt;/dl&gt;</span>
<span class="c"> *</span>
<span class="c"> * @attribute asyncMode</span>
<span class="c"> * @type String</span>
<span class="c"> * @default &quot;allowAll&quot;</span>
<span class="c"> */</span>
<span class="nx">asyncMode</span><span class="o">:</span> <span class="o">{</span>
<span class="nx">value</span><span class="o">:</span> <span class="s2">&quot;allowAll&quot;</span>
<span class="o">},</span>
<span class="c">/**</span>
<span class="c"> * Callback string parameter name sent to the remote script. By default,</span>
<span class="c"> * requests are sent to</span>
<span class="c"> * &amp;#60;URI&amp;#62;?&amp;#60;scriptCallbackParam&amp;#62;=callbackFunction</span>
<span class="c"> *</span>
<span class="c"> * @attribute scriptCallbackParam</span>
<span class="c"> * @type String</span>
<span class="c"> * @default &quot;callback&quot;</span>
<span class="c"> */</span>
<span class="nx">scriptCallbackParam</span> <span class="o">:</span> <span class="o">{</span>
<span class="nx">value</span><span class="o">:</span> <span class="s2">&quot;callback&quot;</span>
<span class="o">},</span>
<span class="c">/**</span>
<span class="c"> * Accepts the DataSource instance and a callback ID, and returns a callback</span>
<span class="c"> * param/value string that gets appended to the script URI. Implementers</span>
<span class="c"> * can customize this string to match their server&#39;s query syntax.</span>
<span class="c"> *</span>
<span class="c"> * @attribute generateRequestCallback</span>
<span class="c"> * @type Function</span>
<span class="c"> */</span>
<span class="nx">generateRequestCallback</span> <span class="o">:</span> <span class="o">{</span>
<span class="nx">value</span><span class="o">:</span> <span class="k">function</span><span class="o">(</span><span class="nx">self</span><span class="o">,</span> <span class="nx">id</span><span class="o">)</span> <span class="o">{</span>
<span class="k">return</span> <span class="s2">&quot;&amp;&quot;</span> <span class="o">+</span> <span class="nx">self</span><span class="o">.</span><span class="nx">get</span><span class="o">(</span><span class="s2">&quot;scriptCallbackParam&quot;</span><span class="o">)</span> <span class="o">+</span> <span class="s2">&quot;=YUI.Env.DataSource.callbacks[&quot;</span><span class="o">+</span><span class="nx">id</span><span class="o">+</span><span class="s2">&quot;]&quot;</span> <span class="o">;</span>
<span class="o">}</span>
<span class="o">}</span>
<span class="o">},</span>
<span class="c">/**</span>
<span class="c"> * Global array of callback functions, one for each request sent.</span>
<span class="c"> *</span>
<span class="c"> * @property callbacks</span>
<span class="c"> * @type Function[]</span>
<span class="c"> * @static</span>
<span class="c"> */</span>
<span class="nx">callbacks</span> <span class="o">:</span> <span class="o">[],</span>
<span class="c">/**</span>
<span class="c"> * Unique ID to track requests.</span>
<span class="c"> *</span>
<span class="c"> * @property _tId</span>
<span class="c"> * @type Number</span>
<span class="c"> * @private</span>
<span class="c"> * @static</span>
<span class="c"> */</span>
<span class="nx">_tId</span> <span class="o">:</span> <span class="m">0</span>
<span class="o">});</span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">extend</span><span class="o">(</span><span class="nx">DSSN</span><span class="o">,</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">DataSource</span><span class="o">.</span><span class="nx">Local</span><span class="o">,</span> <span class="o">{</span>
<span class="c">/**</span>
<span class="c"> * Passes query string to Get Utility. Fires &lt;code&gt;response&lt;/code&gt; event when</span>
<span class="c"> * response is received asynchronously.</span>
<span class="c"> *</span>
<span class="c"> * @method _defRequestFn</span>
<span class="c"> * @param e {Event.Facade} Event Facade with the following properties:</span>
<span class="c"> * &lt;dl&gt;</span>
<span class="c"> * &lt;dt&gt;tId (Number)&lt;/dt&gt; &lt;dd&gt;Unique transaction ID.&lt;/dd&gt;</span>
<span class="c"> * &lt;dt&gt;request (Object)&lt;/dt&gt; &lt;dd&gt;The request.&lt;/dd&gt;</span>
<span class="c"> * &lt;dt&gt;callback (Object)&lt;/dt&gt; &lt;dd&gt;The callback object with the following properties:</span>
<span class="c"> * &lt;dl&gt;</span>
<span class="c"> * &lt;dt&gt;success (Function)&lt;/dt&gt; &lt;dd&gt;Success handler.&lt;/dd&gt;</span>
<span class="c"> * &lt;dt&gt;failure (Function)&lt;/dt&gt; &lt;dd&gt;Failure handler.&lt;/dd&gt;</span>
<span class="c"> * &lt;/dl&gt;</span>
<span class="c"> * &lt;/dd&gt;</span>
<span class="c"> * &lt;dt&gt;cfg (Object)&lt;/dt&gt; &lt;dd&gt;Configuration object.&lt;/dd&gt;</span>
<span class="c"> * &lt;/dl&gt;</span>
<span class="c"> * @protected</span>
<span class="c"> */</span>
<span class="nx">_defRequestFn</span><span class="o">:</span> <span class="k">function</span><span class="o">(</span><span class="nx">e</span><span class="o">)</span> <span class="o">{</span>
<span class="k">var</span> <span class="nx">uri</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="nx">get</span><span class="o">(</span><span class="s2">&quot;source&quot;</span><span class="o">),</span>
<span class="nx">get</span> <span class="o">=</span> <span class="k">this</span><span class="o">.</span><span class="nx">get</span><span class="o">(</span><span class="s2">&quot;get&quot;</span><span class="o">),</span>
<span class="nx">id</span> <span class="o">=</span> <span class="nx">DSSN</span><span class="o">.</span><span class="nx">_tId</span><span class="o">++,</span>
<span class="nx">self</span> <span class="o">=</span> <span class="k">this</span><span class="o">;</span>
<span class="c">// Dynamically add handler function with a closure to the callback stack</span>
<span class="c"></span> <span class="nx">YUI</span><span class="o">.</span><span class="nx">Env</span><span class="o">.</span><span class="nx">DataSource</span><span class="o">.</span><span class="nx">callbacks</span><span class="o">[</span><span class="nx">id</span><span class="o">]</span> <span class="o">=</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">rbind</span><span class="o">(</span><span class="k">function</span><span class="o">(</span><span class="nx">response</span><span class="o">)</span> <span class="o">{</span>
<span class="k">if</span><span class="o">((</span><span class="nx">self</span><span class="o">.</span><span class="nx">get</span><span class="o">(</span><span class="s2">&quot;asyncMode&quot;</span><span class="o">)</span> <span class="o">!==</span> <span class="s2">&quot;ignoreStaleResponses&quot;</span><span class="o">)||</span>
<span class="o">(</span><span class="nx">id</span> <span class="o">===</span> <span class="nx">DSSN</span><span class="o">.</span><span class="nx">callbacks</span><span class="o">.</span><span class="nx">length</span><span class="o">-</span><span class="m">1</span><span class="o">))</span> <span class="o">{</span> <span class="c">// Must ignore stale responses</span>
<span class="c"></span>
<span class="nx">self</span><span class="o">.</span><span class="nx">fire</span><span class="o">(</span><span class="s2">&quot;data&quot;</span><span class="o">,</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">mix</span><span class="o">({</span><span class="nx">data</span><span class="o">:</span><span class="nx">response</span><span class="o">},</span> <span class="nx">e</span><span class="o">));</span>
<span class="o">}</span>
<span class="k">else</span> <span class="o">{</span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">log</span><span class="o">(</span><span class="s2">&quot;DataSource ignored stale response for id &quot;</span> <span class="o">+</span> <span class="nx">e</span><span class="o">.</span><span class="nx">tId</span> <span class="o">+</span> <span class="s2">&quot;(&quot;</span> <span class="o">+</span> <span class="nx">e</span><span class="o">.</span><span class="nx">request</span> <span class="o">+</span> <span class="s2">&quot;)&quot;</span><span class="o">,</span> <span class="s2">&quot;info&quot;</span><span class="o">,</span> <span class="s2">&quot;datasource-scriptnode&quot;</span><span class="o">);</span>
<span class="o">}</span>
<span class="nx">delete</span> <span class="nx">DSSN</span><span class="o">.</span><span class="nx">callbacks</span><span class="o">[</span><span class="nx">id</span><span class="o">];</span>
<span class="o">},</span> <span class="k">this</span><span class="o">,</span> <span class="nx">id</span><span class="o">);</span>
<span class="c">// We are now creating a request</span>
<span class="c"></span> <span class="nx">uri</span> <span class="o">+=</span> <span class="nx">e</span><span class="o">.</span><span class="nx">request</span> <span class="o">+</span> <span class="k">this</span><span class="o">.</span><span class="nx">get</span><span class="o">(</span><span class="s2">&quot;generateRequestCallback&quot;</span><span class="o">)(</span><span class="k">this</span><span class="o">,</span> <span class="nx">id</span><span class="o">);</span>
<span class="c">//uri = this.doBeforeGetScriptNode(sUri);</span>
<span class="c"></span> <span class="nx">Y</span><span class="o">.</span><span class="nx">log</span><span class="o">(</span><span class="s2">&quot;DataSource is querying URL &quot;</span> <span class="o">+</span> <span class="nx">uri</span><span class="o">,</span> <span class="s2">&quot;info&quot;</span><span class="o">,</span> <span class="s2">&quot;datasource-scriptnode&quot;</span><span class="o">);</span>
<span class="nx">get</span><span class="o">.</span><span class="nx">script</span><span class="o">(</span><span class="nx">uri</span><span class="o">,</span> <span class="o">{</span>
<span class="nx">autopurge</span><span class="o">:</span> <span class="kc">true</span><span class="o">,</span>
<span class="c">// Works in Firefox only....</span>
<span class="c"></span> <span class="nx">onFailure</span><span class="o">:</span> <span class="nx">Y</span><span class="o">.</span><span class="nx">bind</span><span class="o">(</span><span class="k">function</span><span class="o">(</span><span class="nx">e</span><span class="o">)</span> <span class="o">{</span>
<span class="nx">e</span><span class="o">.</span><span class="nx">error</span> <span class="o">=</span> <span class="k">new</span> <span class="nb">Error</span><span class="o">(</span><span class="s2">&quot;Script node data failure&quot;</span><span class="o">);</span>
<span class="k">this</span><span class="o">.</span><span class="nx">fire</span><span class="o">(</span><span class="s2">&quot;error&quot;</span><span class="o">,</span> <span class="nx">e</span><span class="o">);</span>
<span class="o">},</span> <span class="k">this</span><span class="o">,</span> <span class="nx">e</span><span class="o">)</span>
<span class="o">});</span>
<span class="k">return</span> <span class="nx">e</span><span class="o">.</span><span class="nx">tId</span><span class="o">;</span>
<span class="o">}</span>
<span class="o">});</span>
<span class="nx">Y</span><span class="o">.</span><span class="nx">DataSource</span><span class="o">.</span><span class="nx">ScriptNode</span> <span class="o">=</span> <span class="nx">DSSN</span><span class="o">;</span>
<span class="nx">YUI</span><span class="o">.</span><span class="nx">namespace</span><span class="o">(</span><span class="s2">&quot;Env.DataSource.callbacks&quot;</span><span class="o">);</span>
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