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<html lang="en"> |
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<head> |
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<meta charset="utf-8"> |
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<title>JSONP</title> |
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<link rel="stylesheet" href="http://fonts.googleapis.com/css?family=PT+Sans:400,700,400italic,700italic"> |
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</head> |
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<body> |
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<!-- |
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<a href="https://github.com/yui/yui3"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://s3.amazonaws.com/github/ribbons/forkme_right_darkblue_121621.png" alt="Fork me on GitHub"></a> |
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--> |
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<div id="doc"> |
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<div id="hd"> |
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<h1><img src="http://yuilibrary.com/img/yui-logo.png"></h1> |
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</div> |
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<a href="#toc" class="jump">Jump to Table of Contents</a> |
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<h1>JSONP</h1> |
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<div class="yui3-g"> |
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<div class="yui3-u-3-4"> |
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<div id="main"> |
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<div class="content"><div class="intro component"> |
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<p> |
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The JSONP Utility is a specialized API for communicating with web |
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services that provide JSON responses wrapped in a callback |
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function. A typical JSONP request URL might look like |
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"http://example.com/service.php?callback=handleData" and |
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receive a text response in the form of |
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<code>handleData({"records":[....]});</code>. |
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</p> |
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<p> |
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The nature of YUI 3's sandbox model complicates JSONP transactions |
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because JSONP relies on a global access point to process the |
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response, but YUI 3 implementation code is typically wrapped in a |
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<code>use(...)</code> callback and is therefore not globally |
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accessible. The JSONP module provides a proxy system for |
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channeling JSONP responses back into your YUI instance sandbox. |
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</p> |
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<p> |
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<strong>Security Note:</strong> JSONP is an inherently unsecure |
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communication method, since it involves the transfer of unvalidated |
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JavaScript. It is by convention alone that the format is |
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associated with JSON, but in reality, the response can include any |
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arbitrary JavaScript, potentially opening your page to attack. |
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<em>Be cautious about which services you communicate with via |
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JSONP</em>. For safe JSON communication, use the <a |
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href="../json/index.html">JSON module</a> in |
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conjunction with the <a |
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href="../io/index.html">IO module</a> wherever |
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possible. |
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</p> |
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</div> |
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<h2 id="getting-started">Getting Started</h2> |
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<p> |
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To include the source files for JSONP and its dependencies, first load |
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the YUI seed file if you haven't already loaded it. |
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</p> |
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<pre class="code prettyprint"><script src="http://yui.yahooapis.com/3.10.3/build/yui/yui-min.js"></script></pre> |
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<p> |
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Next, create a new YUI instance for your application and populate it with the |
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modules you need by specifying them as arguments to the <code>YUI().use()</code> method. |
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YUI will automatically load any dependencies required by the modules you |
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specify. |
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</p> |
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<pre class="code prettyprint"><script> |
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// Create a new YUI instance and populate it with the required modules. |
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YUI().use('jsonp', 'jsonp-url', function (Y) { |
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// JSONP is available and ready for use. Add implementation |
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// code here. |
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}); |
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</script></pre> |
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<p> |
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For more information on creating YUI instances and on the |
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<a href="http://yuilibrary.com/yui/docs/api/classes/YUI.html#method_use"><code>use()</code> method</a>, see the |
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documentation for the <a href="../yui/index.html">YUI Global Object</a>. |
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</p> |
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<h2 id="using">Using the JSONP Utility</h2> |
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<h3 id="basic">Instantiation and the <code>Y.jsonp</code> method</h3> |
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<p> |
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The JSONP utility provides the <code>Y.jsonp(url, callback)</code> method |
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for single transactions as well as a <code>Y.JSONPRequest</code> class to |
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manage reusable connections. |
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</p> |
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<p> |
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The first argument to either the <code>Y.jsonp</code> method or the |
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<code>Y.JSONPRequest</code> constructor is the URL of the JSONP service, |
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and the second is a callback function or <a href="#config">configuration |
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object</a> that contains a callback function. When the service responds |
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with the data, the callback will be executed with the response data as the |
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first parameter. |
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</p> |
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<p> |
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In place of the JSONP callback name in the URL, include the string |
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"{callback}". This placeholder will be used for a proxy function |
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that will route the data to your callback. |
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</p> |
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<pre class="code prettyprint">// instead of service.php?callback=handleJSONP |
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var url = "http://example.com/service.php?callback={callback}"; |
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function handleJSONP(response) { |
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// response is a JavaScript object. No parsing necessary |
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Y.one("#output").setHTML(response.outputHTML); |
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} |
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Y.jsonp(url, handleJSONP); |
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// or |
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var service = new Y.JSONPRequest(url, handleJSONP); |
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service.send();</pre> |
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<h4 id="timing">Sending JSONP requests</h4> |
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<p> |
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<code>Y.jsonp(url, callback)</code> will dispatch the request immediately. |
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JSONPRequest instances will dispatch the request each time their |
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<code>send()</code> method is called. |
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</p> |
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<pre class="code prettyprint">// request sent immediately |
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Y.jsonp(url, handleJSONP); |
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// No request sent |
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var service = new Y.JSONPRequest(url, handleJSONP); |
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// ...until now |
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service.send(); |
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// ...and now again |
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service.send();</pre> |
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<p> |
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<code>Y.jsonp(url, callback)</code> is a convenience wrapper to instantiate |
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a JSONPRequest instance and call its <code>send()</code> method. |
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</p> |
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<p> |
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This will generate a request to a URL like this one (note that the |
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<code>{callback}</code> placeholder has been replaced with a dynamically |
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generated callback name): |
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</p> |
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<pre class="code prettyprint">http://example.com/service.php?callback=YUI.Env.JSONP.yui_3_3_0_1_1294184187597423</pre> |
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<p> |
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The server will then be expected to respond with a JavaScript value wrapped |
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in a call to that function, like this: |
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</p> |
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<pre class="code prettyprint">YUI.Env.JSONP.yui_3_3_0_1_1294184187597423({"foo":"bar"});</pre> |
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<h3 id="config">Configuring the connection</h3> |
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<p> |
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The second argument to either <code>Y.jsonp</code> or the |
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<code>Y.JSONPRequest</code> constructor can be a success callback function |
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or for more control, it can be a configuration object. The supported keys |
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of this object are: |
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</p> |
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<table> |
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<thead> |
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<tr> |
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<th>Property</th> |
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<th>Description</th> |
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</tr> |
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</thead> |
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<tbody> |
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<tr> |
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<td>timeout</td> |
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<td> |
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This value, defined as milliseconds, is a time threshold for |
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the transaction (e.g., <code>{ timeout: 2000 }</code> ). When |
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this limit is reached, the transaction's |
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<code>on.timeout</code> callback will be executed if |
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supplied. |
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</td> |
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</tr> |
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<tr> |
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<td>context</td> |
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<td> |
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Defines what will be "<code>this</code>" in the |
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callbacks. If undefined, the default will be the JSONPRequest |
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instance. |
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</td> |
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</tr> |
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<tr> |
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<td>args</td> |
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<td> |
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An array of additional arguments that will be passed to the |
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callbacks as second, third, and so on arguments. |
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</td> |
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</tr> |
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<tr> |
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<td>on</td> |
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<td> |
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<p> |
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<strong>Required</strong>. This object defines the |
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callbacks to be used for the transaction. At least an |
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<code>on.success</code> handler must be defined. |
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</p> |
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<ul> |
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<li>success (<strong>required</strong>)</li> |
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<li>failure</li> |
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<li>timeout</li> |
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</ul> |
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</td> |
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</tr> |
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<tr> |
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<td>format</td> |
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<td> |
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Preprocessor function to stitch together the supplied URL |
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(first argument), the proxy function name (internally |
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generated), and any additional arguments passed to |
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<code>send()</code>. See <a href="#format">Customizing the |
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JSONP URL</a> for more detail. |
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</td> |
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</tr> |
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</tbody> |
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</table> |
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<p> |
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This is an example of a configuration object, with a set of properties |
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defined. |
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</p> |
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<pre class="code prettyprint">var url = "http://example.com/service.php?callback={callback}", |
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service = new Y.JSONPRequest(url, { |
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on: { |
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success: MyApp.handleJSONP, |
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timeout: MyApp.handleTimeout |
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}, |
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context: MyApp |
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timeout: 3000, // 3 second timeout |
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args: [new Date(), 100] // e.g. handleJSONP(data, date, number) |
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}); |
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service.send(); |
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// or |
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Y.jsonp(url, { |
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on: { |
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success: MyApp.handleJSONP, |
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timeout: MyApp.handleTimeout |
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}, |
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context: MyApp |
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timeout: 3000, // 3 second timeout |
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args: [new Date(), 100] // e.g. handleJSONP(data, date, number) |
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});</pre> |
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<h3 id="url">Parsing the callback from the URL</h3> |
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<p> |
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An extension for the <code>jsonp</code> module is the |
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<code>jsonp-url</code> module which provides a few additional features. |
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</p> |
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<ol> |
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<li> |
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If you have a global function or a function available from the YUI |
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instance (e.g. <code>Y.MyApp.handleJSONP</code>), you can include the |
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name in the URL and omit the second parameter entirely. |
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</li> |
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<li> |
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The URL passed as the first parameter need not include the |
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"{callback}" string. If it is not found, it will look for |
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"callback=", then fall back to adding the query parameter |
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onto the URL. |
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</li> |
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</ol> |
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<pre class="code prettyprint">Y.MyApp.handleJSONP = function (data) { |
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Y.one("#output").setHTML(data.outputHTML); |
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}; |
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Y.jsonp("http://example.com/service.php?callback=Y.MyApp.handleJSONP"); |
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// or |
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Y.jsonp("http://example.com/service.php", { |
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context: Y.MyApp, |
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on: { |
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success: Y.MyApp.handleJSONP, |
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failure: Y.MyApp.handleFailure |
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} |
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});</pre> |
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<h3 id="format">Customizing the JSONP URL</h3> |
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<p> |
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The default URL formatter simply replaces the "{callback}" |
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placehold with the name of the generated proxy function. If you want to |
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customize the URL generation process, you can provide a <code>format</code> |
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function in the configuration. The function will receive the configured |
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URL (with "{callback}" placeholder), the string name of the proxy |
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function, and any additional arguments that were passed to |
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<code>send()</code>. |
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</p> |
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<pre class="code prettyprint">// Our custom formatter will expect a URL with an additional placeholder for |
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// username that must be supplied in send("bill"); |
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// e.g. http://example.com/bill/json?fn=YUI.Env.JSONP._12345 |
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function prepareJSONPUrl(url, proxy, username) { |
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return Y.Lang.sub(url, { |
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callback: proxy, |
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name: username || "user" |
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}); |
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} |
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var url = "http://example.com/{name}/json?fn={callback}"; |
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var service = new Y.JSONPRequest(url, { |
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format: prepareJSONPUrl, |
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on: { |
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success: handleJSONP |
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} |
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}); |
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service.send("apipkin"); |
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service.send("tivac"); |
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service.send("razass");</pre> |
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<h2 id="issues">Known Issues</h2> |
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<ul> |
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<li> |
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Unlike the XMLHttpRequest calls generated by the IO utility, JSONP |
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requests can't be aborted, since they rely on dynamic script insertion |
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(which provides less low-level control than XHR). Keep this in mind |
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when deciding which method to use. |
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</li> |
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<li> |
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Since most browsers don't enforce execution order for dynamically |
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inserted scripts, JSONP callbacks may not be called in the same order |
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that the requests were sent. On the other hand, some browsers |
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<em>do</em> enforce execution order, so in these browsers a slow |
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request may block the execution of subsequent JSONP callbacks. |
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</li> |
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<li> |
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In WinJS (Windows 8 application mode), JSONP is not supported |
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due to the security measures enforced in that environment. Making |
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a JSONP request requires a remote script tag which is prohibited. |
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An alternative is to use the YQL module to query a YQL table that |
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can return the data that you need. The YQL module is supported in |
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this environment because it uses native <code>XMLHttpRequest</code> to fetch it's data. |
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</li> |
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</ul> |
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</div> |
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</div> |
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</div> |
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<div class="yui3-u-1-4"> |
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<div class="sidebar"> |
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<div id="toc" class="sidebox"> |
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<div class="hd"> |
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<h2 class="no-toc">Table of Contents</h2> |
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</div> |
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<div class="bd"> |
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<ul class="toc"> |
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<li> |
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<a href="#getting-started">Getting Started</a> |
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</li> |
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<li> |
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<a href="#using">Using the JSONP Utility</a> |
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<ul class="toc"> |
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<li> |
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<a href="#basic">Instantiation and the <code>Y.jsonp</code> method</a> |
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<ul class="toc"> |
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<li> |
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<a href="#timing">Sending JSONP requests</a> |
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</li> |
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</ul> |
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</li> |
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<li> |
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<a href="#config">Configuring the connection</a> |
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</li> |
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<li> |
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<a href="#url">Parsing the callback from the URL</a> |
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</li> |
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<li> |
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<a href="#format">Customizing the JSONP URL</a> |
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</li> |
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</ul> |
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</li> |
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<li> |
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<a href="#issues">Known Issues</a> |
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</li> |
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</ul> |
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</div> |
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</div> |
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<div class="sidebox"> |
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<div class="hd"> |
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<h2 class="no-toc">Examples</h2> |
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</div> |
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<div class="bd"> |
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<ul class="examples"> |
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<li data-description="Get basic GitHub user info using a Y.jsonp(url, callback)."> |
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<a href="jsonp-github.html">Getting Cross Domain JSON Data Using Y.jsonp()</a> |
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</li> |
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447 |
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448 |
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449 |
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<li data-description="Create a reusable JSONPRequest object to poll the YUILibrary.com Gallery web service, fetching info on a random Gallery module."> |
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<a href="jsonp-gallery.html">Reusing a JSONPRequest Instance to Poll a Remote Server</a> |
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</li> |
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</ul> |
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</div> |
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</div> |
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<div class="sidebox"> |
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466 |
<div class="hd"> |
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467 |
<h2 class="no-toc">Examples That Use This Component</h2> |
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468 |
</div> |
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469 |
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<div class="bd"> |
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471 |
<ul class="examples"> |
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472 |
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473 |
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475 |
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476 |
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477 |
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<li data-description="Wrapping async transactions with promises"> |
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<a href="../promise/basic-example.html">Wrapping async transactions with promises</a> |
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480 |
</li> |
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481 |
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<li data-description="Extend Y.Promise to create classes that encapsulate standard transaction logic in descriptive method names"> |
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<a href="../promise/subclass-example.html">Subclassing Y.Promise</a> |
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486 |
</li> |
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487 |
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488 |
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</ul> |
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</div> |
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</div> |
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</div> |
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</div> |
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</div> |
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</div> |
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<script src="../assets/vendor/prettify/prettify-min.js"></script> |
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<script>prettyPrint();</script> |
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<script> |
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YUI.Env.Tests = { |
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examples: [], |
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project: '../assets', |
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assets: '../assets/jsonp', |
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name: 'jsonp', |
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title: 'JSONP', |
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newWindow: '', |
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auto: false |
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}; |
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YUI.Env.Tests.examples.push('jsonp-github'); |
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512 |
YUI.Env.Tests.examples.push('jsonp-gallery'); |
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YUI.Env.Tests.examples.push('basic-example'); |
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YUI.Env.Tests.examples.push('subclass-example'); |
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515 |
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</script> |
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517 |
<script src="../assets/yui/test-runner.js"></script> |
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518 |
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519 |
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520 |
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</body> |
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</html> |