--- /dev/null Thu Jan 01 00:00:00 1970 +0000
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+ <title>YUI Library Examples: IO: Cross-Domain JSON Transaction — Retrieving a News Feed from Yahoo! Pipes</title>
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+<body id="yahoo-com" class=" yui-skin-sam">
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+ <div id="pagetitle"><h1>YUI Library Examples: IO: Cross-Domain JSON Transaction — Retrieving a News Feed from Yahoo! Pipes</h1></div>
+</div>
+<div id="bd">
+
+ <div id="bar-note"><p><strong>Note:</strong> This is YUI 3.x. Looking for <a href="http://developer.yahoo.com/yui/">YUI 2.x</a>?</p></div>
+
+ <div id="yui-main">
+ <div class="yui-b">
+ <div class="yui-ge">
+ <div class="yui-u first example" id="main">
+
+ <h2>IO: Cross-Domain JSON Transaction — Retrieving a News Feed from Yahoo! Pipes</h2>
+
+ <div id="example" class="promo">
+ <p>
+ <p>In the example below, IO is employed to make a cross-domain request to <a href="http://pipes.yahoo.com">Yahoo! Pipes</a>. The output of the Pipe is an RSS-style feed formatted as JSON. We pass that output to the JSON Utility's <code>parse</code> method for sanitization and then display the contents of the Pipe in a list.</p>
+
+<p>The cross-domain approach obviates the need for a server-side proxy, making it faster. And the use of IO in place of a script node allows us to retrieve the JSON data as a string and execute <code>JSON.parse</code> against it, making it safer to use; a script node would evaluate immediately in the global scope as soon as it was loaded.</p> </p>
+
+ <div class="module example-container ">
+ <div class="hd exampleHd">
+ <p class="newWindowButton yui-skin-sam">
+ <a href="io-xdr_clean.html" target="_blank">View example in new window.</a>
+ </p>
+ </div> <div id="example-canvas" class="bd">
+
+
+ <!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
+
+ <button id="fetch" disabled="disabled">Load JSON RSS news feed from Yahoo! Pipes.</button>
+
+<div id="output">
+ <ul>
+ <li>Content from Yahoo! Pipes feed will display here.</li>
+ </ul>
+</div>
+
+<script language="javascript">
+
+YUI({base:"../../build/", timeout: 10000}).use("io", "substitute", "json-parse",
+
+ function(Y) {
+
+ //Data fetched will be displayed in a UL in the
+ //element #output:
+ var output = Y.Node.get("#output ul");
+
+ //Configure the cross-domain protocol:
+ var xdrConfig = {
+ id:'flash', //We'll reference this id in the xdr configuration of our transaction.
+ yid: Y.id, //The yid provides a link from the Flash-based XDR engine
+ //and the YUI instance.
+ src:'../../build/io/io.swf?t=' + new Date().valueOf().toString() //Relative path to the .swf file from the current page.
+ };
+ Y.io.transport(xdrConfig);
+
+ //Event handler called when the transaction begins:
+ var handleStart = function(id, a) {
+ Y.log("io:start firing.", "info", "example");
+ output.set("innerHTML", "<li>Loading news stories via Yahoo! Pipes feed...</li>");
+ }
+
+ //Event handler for the success event -- use this handler to write the fetched
+ //RSS items to the page.
+ var handleSuccess = function(id, o, a) {
+
+ //We use JSON.parse to sanitize the JSON (as opposed to simply eval'ing
+ //it into the page):
+ var oRSS = Y.JSON.parse(o.responseText);
+
+ //From here, we simply access the JSON data from where it's provided
+ //in the Yahoo! Pipes output:
+ if (oRSS && oRSS.count) {
+
+ var s = "<!--begin news stories fetched via Yahoo! Pipes-->",
+ //t in this case is our simple template; this is fed to
+ //Y.Lang.substitute as we loop through RSS items:
+ t = "<li><a href='{link}'>{title}</a>, {pubDate}</li>";
+
+ for (var i=0; i<oRSS.count; i++) {
+ s += Y.Lang.substitute(t, oRSS.value.items[i]);
+ }
+
+ //Output the string to the page:
+ output.set("innerHTML", s);
+ output.addClass("yui-null");
+
+ } else {
+ //No news stories were found in the feed.
+ var s = "<li>The RSS feed did not return any items.</li>";
+ }
+ }
+
+ //In the event that the HTTP status returned is > 399, a
+ //failure is reported and this function is called:
+ var handleFailure = function(id, o, a) {
+ Y.log("ERROR " + id + " " + a, "info", "example");
+ }
+
+ //With all the aparatus in place, we can now configure our
+ //io call.
+ var cfg = {
+ method: "GET",
+ xdr: {
+ use:'flash' //This is the xdrConfig id we referenced above.
+ },
+ on: {
+ //Our event handlers previously defined:
+ start: handleStart,
+ success: handleSuccess,
+ failure: handleFailure
+ }
+ };
+
+ //Wire the buttton to a click handler to fire our request each
+ //time the button is clicked:
+ var handleClick = function(o) {
+ Y.log("Click detected; beginning io request to Yahoo! Pipes.", "info", "example");
+ var obj = Y.io(
+ //this is a specific Pipes feed, populated with cycling news:
+ "http://pipes.yahooapis.com/pipes/pipe.run?_id=giWz8Vc33BG6rQEQo_NLYQ&_render=json",
+ cfg
+ );
+ }
+
+ //add the clickHandler as soon as the xdr Flash module has
+ //loaded:
+ Y.on('io:xdrReady', function() {
+ var fetch = Y.Node.get("#fetch");
+ fetch.set("disabled", false);
+ Y.on("click", handleClick, fetch);
+ });
+
+ }
+);
+</script>
+ <!--END SOURCE CODE FOR EXAMPLE =============================== -->
+
+
+ </div>
+ </div>
+ </div>
+
+ <h2 class="first">Implementing a Simple Cross-Domain Request for JSON Data</h2>
+
+<p>In this example, we begin with a YUI instance that loads the IO and JSON modules:</p>
+
+<textarea name="code" class="JScript" cols="60" rows="1">
+//Create a YUI instance including support for IO and JSON modules:
+YUI({base:"../../build/", timeout: 10000}).use("io-xdr", "substitute", "json-parse", function(Y) {
+ // Y is the YUI instance.
+ // The rest of the following code is encapsulated in this
+ // anonymous function.
+} );
+</textarea>
+<p>We'll also get a Node reference to the container we'll be using to output the data we retrieve:</p>
+
+<textarea name="code" class="JScript" cols="60" rows="1">//Data fetched will be displayed in a UL in the
+//element #output:
+var output = Y.Node.get("#output ul");</textarea>
+
+<p>Next, we configure IO's cross-domain interface for this YUI instance. Flash is the underlying mechansim used here. Be sure to configure the <code>src</code> property to point to your <code>IO.swf</code> file.</p>
+
+<textarea name="code" class="JScript" cols="60" rows="1">//Configure the cross-domain protocol:
+var xdrConfig = {
+ id:'flash', //We'll reference this id in the xdr configuration of our transaction.
+ yid: Y.id, //The yid provides a link from the Flash-based XDR engine
+ //and the YUI instance.
+ src:'../../build/io/IO.swf?t=' + new Date().valueOf().toString() //Relative path to the .swf file from the current page.
+};
+Y.io.transport(xdrConfig);</textarea>
+
+<p>The configuration for our specific IO transaction contains a reference to the <code>xdr</code> configuration we created above and specifies that there will not be a need to process the response as XML (we're getting JSON instead):</p>
+
+<textarea name="code" class="JScript" cols="60" rows="1">var cfg = {
+ method: "GET",
+ xdr: {
+ use:'flash', //This is the xdrConfig id we referenced above.
+ responseXML:false //we're using JSON -- marginally faster, and
+ //supported by the Pipes API
+ },
+ on: {
+ //Our event handlers previously defined:
+ start: handleStart,
+ success: handleSuccess,
+ failure: handleFailure
+ }
+};</textarea>
+
+<p>The final step is to make the request:</p>
+
+<textarea name="code" class="JScript" cols="60" rows="1">var obj = Y.io(
+ //this is a specific Pipes feed, populated with cycling news:
+ "http://pipes.yahooapis.com/pipes/pipe.run?_id=giWz8Vc33BG6rQEQo_NLYQ&_render=json",
+ cfg
+);</textarea>
+
+<h3>Full Script</h3>
+
+<p>The full script source for this example is as follows:</p>
+
+<textarea name="code" class="JScript" cols="60" rows="1">
+YUI({base:"../../build/", timeout: 10000}).use("io-xdr", "substitute", "json-parse",
+
+ function(Y) {
+
+ //Data fetched will be displayed in a UL in the
+ //element #output:
+ var output = Y.Node.get("#output ul");
+
+ //Configure the cross-domain protocol:
+ var xdrConfig = {
+ id:'flash', //We'll reference this id in the xdr configuration of our transaction.
+ yid: Y.id, //The yid provides a link from the Flash-based XDR engine
+ //and the YUI instance.
+ src:'../../build/io/IO.swf' //Relative path to the .swf file from the current page.
+ };
+ Y.io.transport(xdrConfig);
+
+ //Event handler called when the transaction begins:
+ var handleStart = function(id, a) {
+ Y.log("io:start firing.", "info", "example");
+ output.set("innerHTML", "<li>Loading news stories via Yahoo! Pipes feed...</li>");
+ }
+
+ //Event handler for the success event -- use this handler to write the fetched
+ //RSS items to the page.
+ var handleSuccess = function(id, o, a) {
+
+ //We use JSON.parse to sanitize the JSON (as opposed to simply eval'ing
+ //it into the page):
+ var oRSS = Y.JSON.parse(o.responseText);
+
+ //From here, we simply access the JSON data from where it's provided
+ //in the Yahoo! Pipes output:
+ if (oRSS && oRSS.count) {
+
+ var s = "<!--begin news stories fetched via Yahoo! Pipes-->",
+ //t in this case is our simple template; this is fed to
+ //Y.Lang.substitute as we loop through RSS items:
+ t = "<li><a href='{link}'>{title}</a>, {pubDate}</li>";
+
+ for (var i=0; i<oRSS.count; i++) {
+ s += Y.Lang.substitute(t, oRSS.value.items[i]);
+ }
+
+ //Output the string to the page:
+ output.set("innerHTML", s);
+
+ } else {
+ //No news stories were found in the feed.
+ var s = "<li>The RSS feed did not return any items.</li>";
+ }
+ }
+
+ //In the event that the HTTP status returned is > 399, a
+ //failure is reported and this function is called:
+ var handleFailure = function(id, o, a) {
+ Y.log("ERROR " + id + " " + a, "info", "example");
+ }
+
+ //With all the aparatus in place, we can now configure our
+ //io call.
+ var cfg = {
+ method: "GET",
+ xdr: {
+ use:'flash', //This is the xdrConfig id we referenced above.
+ responseXML:false //we're using JSON -- marginally faster, and
+ //supported by the Pipes API
+ },
+ on: {
+ //Our event handlers previously defined:
+ start: handleStart,
+ success: handleSuccess,
+ failure: handleFailure
+ }
+ };
+
+ //Wire the buttton to a click handler to fire our request each
+ //time the button is clicked:
+ var handleClick = function(o) {
+ Y.log("Click detected; beginning io request to Yahoo! Pipes.", "info", "example");
+ var obj = Y.io(
+ //this is a specific Pipes feed, populated with cycling news:
+ "http://pipes.yahooapis.com/pipes/pipe.run?_id=giWz8Vc33BG6rQEQo_NLYQ&_render=json",
+ cfg
+ );
+ }
+
+ //add the clickHandler as soon as the xdr Flash module has
+ //loaded:
+ Y.on('io:xdrReady', function() {
+ var fetch = Y.Node.get("#fetch");
+ fetch.set("disabled", false);
+ Y.on("click", handleClick, fetch);
+ });
+ }
+);
+</textarea> </div>
+ <div class="yui-u sidebar">
+
+
+ <div id="examples" class="mod box4">
+ <div class="hd">
+ <h4>
+ IO Examples:</h4>
+ </div>
+ <div class="bd">
+ <ul>
+ <li><a href='../io/io-get.html'>GET Transaction</a></li><li><a href='../io/io-post.html'>POST Transaction</a></li><li><a href='../io/io-weather.html'>XML Transaction — Retrieving a Yahoo! Weather RSS (XML) Feed via a Server-Side Proxy</a></li><li class='selected'><a href='../io/io-xdr.html'>Cross-Domain JSON Transaction — Retrieving a News Feed from Yahoo! Pipes</a></li><li><a href='../node-menunav/node-menunav-8.html'>Adding Submenus On The Fly (included with examples for MenuNav Node Plugin)</a></li><li><a href='../overlay/overlay-io-plugin.html'>IO Plugin (included with examples for Overlay)</a></li><li><a href='../dd/portal-drag.html'>Portal Style Example (included with examples for Drag & Drop)</a></li> </ul>
+ </div>
+ </div>
+
+ <div class="mod box4">
+ <div class="hd">
+ <h4>More IO Resources:</h4>
+ </div>
+ <div class="bd">
+ <ul>
+ <!-- <li><a href="http://developer.yahoo.com/yui/io/">User's Guide</a> (external)</li> -->
+ <li><a href="../../api/module_io.html">API Documentation</a></li>
+</ul>
+ </div>
+ </div>
+ </div>
+ </div>
+
+ </div>
+ </div>
+
+
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