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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>
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<h2>IO: Cross-Domain JSON Transaction — Retrieving a News Feed from Yahoo! Pipes</h2>
<div id="example" class="promo">
<div class="example-intro">
<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> </div>
<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>
<div id="syntax1" class="yui-syntax-highlight"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1"><span class="co1">//Create a YUI instance including support for IO and JSON modules:</span></div></li><li class="li1"><div class="de1">YUI<span class="br0">(</span><span class="br0">{</span>base<span class="sy0">:</span><span class="st0">"../../build/"</span><span class="sy0">,</span> timeout<span class="sy0">:</span> <span class="nu0">10000</span><span class="br0">}</span><span class="br0">)</span>.<span class="kw2">use</span><span class="br0">(</span><span class="st0">"io-xdr"</span><span class="sy0">,</span> <span class="st0">"substitute"</span><span class="sy0">,</span> <span class="st0">"json-parse"</span><span class="sy0">,</span> <span class="kw2">function</span><span class="br0">(</span>Y<span class="br0">)</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> <span class="co1">// Y is the YUI instance.</span></div></li><li class="li1"><div class="de1"> <span class="co1">// The rest of the following code is encapsulated in this</span></div></li><li class="li2"><div class="de2"> <span class="co1">// anonymous function.</span></div></li><li class="li1"><div class="de1"><span class="br0">}</span><span class="br0">)</span><span class="sy0">;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;"><span class="co1">//Create a YUI instance including support for IO and JSON modules:</span>
YUI<span class="br0">(</span><span class="br0">{</span>base<span class="sy0">:</span><span class="st0">"../../build/"</span><span class="sy0">,</span> timeout<span class="sy0">:</span> <span class="nu0">10000</span><span class="br0">}</span><span class="br0">)</span>.<span class="kw2">use</span><span class="br0">(</span><span class="st0">"io-xdr"</span><span class="sy0">,</span> <span class="st0">"substitute"</span><span class="sy0">,</span> <span class="st0">"json-parse"</span><span class="sy0">,</span> <span class="kw2">function</span><span class="br0">(</span>Y<span class="br0">)</span> <span class="br0">{</span>
<span class="co1">// Y is the YUI instance.</span>
<span class="co1">// The rest of the following code is encapsulated in this</span>
<span class="co1">// anonymous function.</span>
<span class="br0">}</span><span class="br0">)</span><span class="sy0">;</span></pre></div><textarea id="syntax1-plain">//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></div><p>We'll also get a Node reference to the container we'll be using to output the data we retrieve:</p>
<div id="syntax2" class="yui-syntax-highlight"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1"><span class="co1">//element #output:</span></div></li><li class="li1"><div class="de1"><span class="kw2">var</span> output <span class="sy0">=</span> Y.<span class="me1">Node</span>.<span class="me1">get</span><span class="br0">(</span><span class="st0">"#output ul"</span><span class="br0">)</span><span class="sy0">;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;"><span class="co1">//element #output:</span>
<span class="kw2">var</span> output <span class="sy0">=</span> Y.<span class="me1">Node</span>.<span class="me1">get</span><span class="br0">(</span><span class="st0">"#output ul"</span><span class="br0">)</span><span class="sy0">;</span></pre></div><textarea id="syntax2-plain">//element #output:
var output = Y.Node.get("#output ul");</textarea></div>
<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>
<div id="syntax3" class="yui-syntax-highlight"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1"><span class="co1">//Configure the cross-domain protocol:</span></div></li><li class="li1"><div class="de1"><span class="kw2">var</span> xdrConfig <span class="sy0">=</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> id<span class="sy0">:</span><span class="st0">'flash'</span><span class="sy0">,</span> <span class="co1">//We'll reference this id in the xdr configuration of our transaction.</span></div></li><li class="li1"><div class="de1"> yid<span class="sy0">:</span> Y.<span class="me1">id</span><span class="sy0">,</span> <span class="co1">//The yid provides a link from the Flash-based XDR engine</span></div></li><li class="li2"><div class="de2"> <span class="co1">//and the YUI instance.</span></div></li><li class="li1"><div class="de1"> src<span class="sy0">:</span><span class="st0">'../../build/io/IO.swf?t='</span> <span class="sy0">+</span> <span class="kw2">new</span> Date<span class="br0">(</span><span class="br0">)</span>.<span class="me1">valueOf</span><span class="br0">(</span><span class="br0">)</span>.<span class="me1">toString</span><span class="br0">(</span><span class="br0">)</span> <span class="co1">//Relative path to the .swf file from the current page.</span></div></li><li class="li1"><div class="de1"><span class="br0">}</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1">Y.<span class="me1">io</span>.<span class="me1">transport</span><span class="br0">(</span>xdrConfig<span class="br0">)</span><span class="sy0">;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;"><span class="co1">//Configure the cross-domain protocol:</span>
<span class="kw2">var</span> xdrConfig <span class="sy0">=</span> <span class="br0">{</span>
id<span class="sy0">:</span><span class="st0">'flash'</span><span class="sy0">,</span> <span class="co1">//We'll reference this id in the xdr configuration of our transaction.</span>
yid<span class="sy0">:</span> Y.<span class="me1">id</span><span class="sy0">,</span> <span class="co1">//The yid provides a link from the Flash-based XDR engine</span>
<span class="co1">//and the YUI instance.</span>
src<span class="sy0">:</span><span class="st0">'../../build/io/IO.swf?t='</span> <span class="sy0">+</span> <span class="kw2">new</span> Date<span class="br0">(</span><span class="br0">)</span>.<span class="me1">valueOf</span><span class="br0">(</span><span class="br0">)</span>.<span class="me1">toString</span><span class="br0">(</span><span class="br0">)</span> <span class="co1">//Relative path to the .swf file from the current page.</span>
<span class="br0">}</span><span class="sy0">;</span>
Y.<span class="me1">io</span>.<span class="me1">transport</span><span class="br0">(</span>xdrConfig<span class="br0">)</span><span class="sy0">;</span></pre></div><textarea id="syntax3-plain">//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></div>
<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>
<div id="syntax4" class="yui-syntax-highlight"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1"><span class="kw2">var</span> cfg <span class="sy0">=</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> method<span class="sy0">:</span> <span class="st0">"GET"</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> xdr<span class="sy0">:</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> <span class="kw2">use</span><span class="sy0">:</span><span class="st0">'flash'</span><span class="sy0">,</span> <span class="co1">//This is the xdrConfig id we referenced above.</span></div></li><li class="li2"><div class="de2"> responseXML<span class="sy0">:</span><span class="kw2">false</span> <span class="co1">//we're using JSON -- marginally faster, and</span></div></li><li class="li1"><div class="de1"> <span class="co1">//supported by the Pipes API</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> on<span class="sy0">:</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> <span class="co1">//Our event handlers previously defined:</span></div></li><li class="li2"><div class="de2"> start<span class="sy0">:</span> handleStart<span class="sy0">,</span></div></li><li class="li1"><div class="de1"> success<span class="sy0">:</span> handleSuccess<span class="sy0">,</span></div></li><li class="li1"><div class="de1"> failure<span class="sy0">:</span> handleFailure</div></li><li class="li1"><div class="de1"> <span class="br0">}</span></div></li><li class="li1"><div class="de1"><span class="br0">}</span><span class="sy0">;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;"><span class="kw2">var</span> cfg <span class="sy0">=</span> <span class="br0">{</span>
method<span class="sy0">:</span> <span class="st0">"GET"</span><span class="sy0">,</span>
xdr<span class="sy0">:</span> <span class="br0">{</span>
<span class="kw2">use</span><span class="sy0">:</span><span class="st0">'flash'</span><span class="sy0">,</span> <span class="co1">//This is the xdrConfig id we referenced above.</span>
responseXML<span class="sy0">:</span><span class="kw2">false</span> <span class="co1">//we're using JSON -- marginally faster, and</span>
<span class="co1">//supported by the Pipes API</span>
<span class="br0">}</span><span class="sy0">,</span>
on<span class="sy0">:</span> <span class="br0">{</span>
<span class="co1">//Our event handlers previously defined:</span>
start<span class="sy0">:</span> handleStart<span class="sy0">,</span>
success<span class="sy0">:</span> handleSuccess<span class="sy0">,</span>
failure<span class="sy0">:</span> handleFailure
<span class="br0">}</span>
<span class="br0">}</span><span class="sy0">;</span></pre></div><textarea id="syntax4-plain">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></div>
<p>The final step is to make the request:</p>
<div id="syntax5" class="yui-syntax-highlight"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1"><span class="kw2">var</span> obj <span class="sy0">=</span> Y.<span class="me1">io</span><span class="br0">(</span></div></li><li class="li1"><div class="de1"> <span class="co1">//this is a specific Pipes feed, populated with cycling news:</span></div></li><li class="li1"><div class="de1"> <span class="st0">"http://pipes.yahooapis.com/pipes/pipe.run?_id=giWz8Vc33BG6rQEQo_NLYQ&_render=json"</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> cfg</div></li><li class="li2"><div class="de2"><span class="br0">)</span><span class="sy0">;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;"><span class="kw2">var</span> obj <span class="sy0">=</span> Y.<span class="me1">io</span><span class="br0">(</span>
<span class="co1">//this is a specific Pipes feed, populated with cycling news:</span>
<span class="st0">"http://pipes.yahooapis.com/pipes/pipe.run?_id=giWz8Vc33BG6rQEQo_NLYQ&_render=json"</span><span class="sy0">,</span>
cfg
<span class="br0">)</span><span class="sy0">;</span></pre></div><textarea id="syntax5-plain">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></div>
<h3>Full Script</h3>
<p>The full script source for this example is as follows:</p>
<div id="syntax6" class="yui-syntax-highlight yui-syntax-highlight-linenumbers"><div class="numbers"><pre class="javascript" style="font-family:monospace;"><ol><li class="li1"><div class="de1">YUI<span class="br0">(</span><span class="br0">{</span>base<span class="sy0">:</span><span class="st0">"../../build/"</span><span class="sy0">,</span> timeout<span class="sy0">:</span> <span class="nu0">10000</span><span class="br0">}</span><span class="br0">)</span>.<span class="kw2">use</span><span class="br0">(</span><span class="st0">"io-xdr"</span><span class="sy0">,</span> <span class="st0">"substitute"</span><span class="sy0">,</span> <span class="st0">"json-parse"</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> </div></li><li class="li1"><div class="de1"> <span class="kw2">function</span><span class="br0">(</span>Y<span class="br0">)</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> </div></li><li class="li2"><div class="de2"> <span class="co1">//Data fetched will be displayed in a UL in the</span></div></li><li class="li1"><div class="de1"> <span class="co1">//element #output:</span></div></li><li class="li1"><div class="de1"> <span class="kw2">var</span> output <span class="sy0">=</span> Y.<span class="me1">Node</span>.<span class="me1">get</span><span class="br0">(</span><span class="st0">"#output ul"</span><span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> </div></li><li class="li1"><div class="de1"> <span class="co1">//Configure the cross-domain protocol:</span></div></li><li class="li2"><div class="de2"> <span class="kw2">var</span> xdrConfig <span class="sy0">=</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> id<span class="sy0">:</span><span class="st0">'flash'</span><span class="sy0">,</span> <span class="co1">//We'll reference this id in the xdr configuration of our transaction.</span></div></li><li class="li1"><div class="de1"> yid<span class="sy0">:</span> Y.<span class="me1">id</span><span class="sy0">,</span> <span class="co1">//The yid provides a link from the Flash-based XDR engine</span></div></li><li class="li1"><div class="de1"> <span class="co1">//and the YUI instance.</span></div></li><li class="li1"><div class="de1"> src<span class="sy0">:</span><span class="st0">'../../build/io/io.swf'</span> <span class="co1">//Relative path to the .swf file from the current page.</span></div></li><li class="li2"><div class="de2"> <span class="br0">}</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> Y.<span class="me1">io</span>.<span class="me1">transport</span><span class="br0">(</span>xdrConfig<span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> </div></li><li class="li1"><div class="de1"> <span class="co1">//Event handler called when the transaction begins:</span></div></li><li class="li1"><div class="de1"> <span class="kw2">var</span> handleStart <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">(</span>id<span class="sy0">,</span> a<span class="br0">)</span> <span class="br0">{</span></div></li><li class="li2"><div class="de2"> Y.<span class="me1">log</span><span class="br0">(</span><span class="st0">"io:start firing."</span><span class="sy0">,</span> <span class="st0">"info"</span><span class="sy0">,</span> <span class="st0">"example"</span><span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> output.<span class="me1">set</span><span class="br0">(</span><span class="st0">"innerHTML"</span><span class="sy0">,</span> <span class="st0">"<li>Loading news stories via Yahoo! Pipes feed...</li>"</span><span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span></div></li><li class="li1"><div class="de1"> </div></li><li class="li1"><div class="de1"> <span class="co1">//Event handler for the success event -- use this handler to write the fetched</span></div></li><li class="li2"><div class="de2"> <span class="co1">//RSS items to the page.</span></div></li><li class="li1"><div class="de1"> <span class="kw2">var</span> handleSuccess <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">(</span>id<span class="sy0">,</span> o<span class="sy0">,</span> a<span class="br0">)</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> </div></li><li class="li1"><div class="de1"> <span class="co1">//We use JSON.parse to sanitize the JSON (as opposed to simply eval'ing</span></div></li><li class="li1"><div class="de1"> <span class="co1">//it into the page):</span></div></li><li class="li2"><div class="de2"> <span class="kw2">var</span> oRSS <span class="sy0">=</span> Y.<span class="me1">JSON</span>.<span class="me1">parse</span><span class="br0">(</span>o.<span class="me1">responseText</span><span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> </div></li><li class="li1"><div class="de1"> <span class="co1">//From here, we simply access the JSON data from where it's provided</span></div></li><li class="li1"><div class="de1"> <span class="co1">//in the Yahoo! Pipes output:</span></div></li><li class="li1"><div class="de1"> <span class="kw1">if</span> <span class="br0">(</span>oRSS <span class="sy0">&&</span> oRSS.<span class="me1">count</span><span class="br0">)</span> <span class="br0">{</span></div></li><li class="li2"><div class="de2"> </div></li><li class="li1"><div class="de1"> <span class="kw2">var</span> s <span class="sy0">=</span> <span class="st0">"<!--begin news stories fetched via Yahoo! Pipes-->"</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> <span class="co1">//t in this case is our simple template; this is fed to</span></div></li><li class="li1"><div class="de1"> <span class="co1">//Y.Lang.substitute as we loop through RSS items:</span></div></li><li class="li1"><div class="de1"> t <span class="sy0">=</span> <span class="st0">"<li><a href='{link}'>{title}</a>, {pubDate}</li>"</span><span class="sy0">;</span></div></li><li class="li2"><div class="de2"> </div></li><li class="li1"><div class="de1"> <span class="kw1">for</span> <span class="br0">(</span><span class="kw2">var</span> i<span class="sy0">=</span><span class="nu0">0</span><span class="sy0">;</span> i<span class="sy0"><</span>oRSS.<span class="me1">count</span><span class="sy0">;</span> i<span class="sy0">++</span><span class="br0">)</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> s <span class="sy0">+=</span> Y.<span class="me1">Lang</span>.<span class="me1">substitute</span><span class="br0">(</span>t<span class="sy0">,</span> oRSS.<span class="me1">value</span>.<span class="me1">items</span><span class="br0">[</span>i<span class="br0">]</span><span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span></div></li><li class="li1"><div class="de1"> </div></li><li class="li2"><div class="de2"> <span class="co1">//Output the string to the page:</span></div></li><li class="li1"><div class="de1"> output.<span class="me1">set</span><span class="br0">(</span><span class="st0">"innerHTML"</span><span class="sy0">,</span> s<span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> </div></li><li class="li1"><div class="de1"> <span class="br0">}</span> <span class="kw1">else</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> <span class="co1">//No news stories were found in the feed.</span></div></li><li class="li2"><div class="de2"> <span class="kw2">var</span> s <span class="sy0">=</span> <span class="st0">"<li>The RSS feed did not return any items.</li>"</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span></div></li><li class="li1"><div class="de1"> </div></li><li class="li1"><div class="de1"> <span class="co1">//In the event that the HTTP status returned is > 399, a</span></div></li><li class="li2"><div class="de2"> <span class="co1">//failure is reported and this function is called:</span></div></li><li class="li1"><div class="de1"> <span class="kw2">var</span> handleFailure <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">(</span>id<span class="sy0">,</span> o<span class="sy0">,</span> a<span class="br0">)</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> Y.<span class="me1">log</span><span class="br0">(</span><span class="st0">"ERROR "</span> <span class="sy0">+</span> id <span class="sy0">+</span> <span class="st0">" "</span> <span class="sy0">+</span> a<span class="sy0">,</span> <span class="st0">"info"</span><span class="sy0">,</span> <span class="st0">"example"</span><span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span></div></li><li class="li1"><div class="de1"> </div></li><li class="li2"><div class="de2"> <span class="co1">//With all the aparatus in place, we can now configure our</span></div></li><li class="li1"><div class="de1"> <span class="co1">//io call.</span></div></li><li class="li1"><div class="de1"> <span class="kw2">var</span> cfg <span class="sy0">=</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> method<span class="sy0">:</span> <span class="st0">"GET"</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> xdr<span class="sy0">:</span> <span class="br0">{</span></div></li><li class="li2"><div class="de2"> <span class="kw2">use</span><span class="sy0">:</span><span class="st0">'flash'</span><span class="sy0">,</span> <span class="co1">//This is the xdrConfig id we referenced above.</span></div></li><li class="li1"><div class="de1"> responseXML<span class="sy0">:</span><span class="kw2">false</span> <span class="co1">//we're using JSON -- marginally faster, and</span></div></li><li class="li1"><div class="de1"> <span class="co1">//supported by the Pipes API</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> on<span class="sy0">:</span> <span class="br0">{</span></div></li><li class="li2"><div class="de2"> <span class="co1">//Our event handlers previously defined:</span></div></li><li class="li1"><div class="de1"> start<span class="sy0">:</span> handleStart<span class="sy0">,</span></div></li><li class="li1"><div class="de1"> success<span class="sy0">:</span> handleSuccess<span class="sy0">,</span></div></li><li class="li1"><div class="de1"> failure<span class="sy0">:</span> handleFailure</div></li><li class="li1"><div class="de1"> <span class="br0">}</span></div></li><li class="li2"><div class="de2"> <span class="br0">}</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> </div></li><li class="li1"><div class="de1"> <span class="co1">//Wire the buttton to a click handler to fire our request each</span></div></li><li class="li1"><div class="de1"> <span class="co1">//time the button is clicked:</span></div></li><li class="li1"><div class="de1"> <span class="kw2">var</span> handleClick <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">(</span>o<span class="br0">)</span> <span class="br0">{</span></div></li><li class="li2"><div class="de2"> Y.<span class="me1">log</span><span class="br0">(</span><span class="st0">"Click detected; beginning io request to Yahoo! Pipes."</span><span class="sy0">,</span> <span class="st0">"info"</span><span class="sy0">,</span> <span class="st0">"example"</span><span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> <span class="kw2">var</span> obj <span class="sy0">=</span> Y.<span class="me1">io</span><span class="br0">(</span></div></li><li class="li1"><div class="de1"> <span class="co1">//this is a specific Pipes feed, populated with cycling news:</span></div></li><li class="li1"><div class="de1"> <span class="st0">"http://pipes.yahooapis.com/pipes/pipe.run?_id=giWz8Vc33BG6rQEQo_NLYQ&_render=json"</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> cfg</div></li><li class="li2"><div class="de2"> <span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span></div></li><li class="li1"><div class="de1"> </div></li><li class="li1"><div class="de1"> <span class="co1">//add the clickHandler as soon as the xdr Flash module has</span></div></li><li class="li1"><div class="de1"> <span class="co1">//loaded:</span></div></li><li class="li2"><div class="de2"> Y.<span class="me1">on</span><span class="br0">(</span><span class="st0">'io:xdrReady'</span><span class="sy0">,</span> <span class="kw2">function</span><span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> <span class="kw2">var</span> fetch <span class="sy0">=</span> Y.<span class="me1">Node</span>.<span class="me1">get</span><span class="br0">(</span><span class="st0">"#fetch"</span><span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> fetch.<span class="me1">set</span><span class="br0">(</span><span class="st0">"disabled"</span><span class="sy0">,</span> <span class="kw2">false</span><span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> Y.<span class="me1">on</span><span class="br0">(</span><span class="st0">"click"</span><span class="sy0">,</span> handleClick<span class="sy0">,</span> fetch<span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span><span class="br0">)</span><span class="sy0">;</span></div></li><li class="li2"><div class="de2"> <span class="br0">}</span></div></li><li class="li1"><div class="de1"><span class="br0">)</span><span class="sy0">;</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;">YUI<span class="br0">(</span><span class="br0">{</span>base<span class="sy0">:</span><span class="st0">"../../build/"</span><span class="sy0">,</span> timeout<span class="sy0">:</span> <span class="nu0">10000</span><span class="br0">}</span><span class="br0">)</span>.<span class="kw2">use</span><span class="br0">(</span><span class="st0">"io-xdr"</span><span class="sy0">,</span> <span class="st0">"substitute"</span><span class="sy0">,</span> <span class="st0">"json-parse"</span><span class="sy0">,</span>
<span class="kw2">function</span><span class="br0">(</span>Y<span class="br0">)</span> <span class="br0">{</span>
<span class="co1">//Data fetched will be displayed in a UL in the</span>
<span class="co1">//element #output:</span>
<span class="kw2">var</span> output <span class="sy0">=</span> Y.<span class="me1">Node</span>.<span class="me1">get</span><span class="br0">(</span><span class="st0">"#output ul"</span><span class="br0">)</span><span class="sy0">;</span>
<span class="co1">//Configure the cross-domain protocol:</span>
<span class="kw2">var</span> xdrConfig <span class="sy0">=</span> <span class="br0">{</span>
id<span class="sy0">:</span><span class="st0">'flash'</span><span class="sy0">,</span> <span class="co1">//We'll reference this id in the xdr configuration of our transaction.</span>
yid<span class="sy0">:</span> Y.<span class="me1">id</span><span class="sy0">,</span> <span class="co1">//The yid provides a link from the Flash-based XDR engine</span>
<span class="co1">//and the YUI instance.</span>
src<span class="sy0">:</span><span class="st0">'../../build/io/io.swf'</span> <span class="co1">//Relative path to the .swf file from the current page.</span>
<span class="br0">}</span><span class="sy0">;</span>
Y.<span class="me1">io</span>.<span class="me1">transport</span><span class="br0">(</span>xdrConfig<span class="br0">)</span><span class="sy0">;</span>
<span class="co1">//Event handler called when the transaction begins:</span>
<span class="kw2">var</span> handleStart <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">(</span>id<span class="sy0">,</span> a<span class="br0">)</span> <span class="br0">{</span>
Y.<span class="me1">log</span><span class="br0">(</span><span class="st0">"io:start firing."</span><span class="sy0">,</span> <span class="st0">"info"</span><span class="sy0">,</span> <span class="st0">"example"</span><span class="br0">)</span><span class="sy0">;</span>
output.<span class="me1">set</span><span class="br0">(</span><span class="st0">"innerHTML"</span><span class="sy0">,</span> <span class="st0">"<li>Loading news stories via Yahoo! Pipes feed...</li>"</span><span class="br0">)</span><span class="sy0">;</span>
<span class="br0">}</span>
<span class="co1">//Event handler for the success event -- use this handler to write the fetched</span>
<span class="co1">//RSS items to the page.</span>
<span class="kw2">var</span> handleSuccess <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">(</span>id<span class="sy0">,</span> o<span class="sy0">,</span> a<span class="br0">)</span> <span class="br0">{</span>
<span class="co1">//We use JSON.parse to sanitize the JSON (as opposed to simply eval'ing</span>
<span class="co1">//it into the page):</span>
<span class="kw2">var</span> oRSS <span class="sy0">=</span> Y.<span class="me1">JSON</span>.<span class="me1">parse</span><span class="br0">(</span>o.<span class="me1">responseText</span><span class="br0">)</span><span class="sy0">;</span>
<span class="co1">//From here, we simply access the JSON data from where it's provided</span>
<span class="co1">//in the Yahoo! Pipes output:</span>
<span class="kw1">if</span> <span class="br0">(</span>oRSS <span class="sy0">&&</span> oRSS.<span class="me1">count</span><span class="br0">)</span> <span class="br0">{</span>
<span class="kw2">var</span> s <span class="sy0">=</span> <span class="st0">"<!--begin news stories fetched via Yahoo! Pipes-->"</span><span class="sy0">,</span>
<span class="co1">//t in this case is our simple template; this is fed to</span>
<span class="co1">//Y.Lang.substitute as we loop through RSS items:</span>
t <span class="sy0">=</span> <span class="st0">"<li><a href='{link}'>{title}</a>, {pubDate}</li>"</span><span class="sy0">;</span>
<span class="kw1">for</span> <span class="br0">(</span><span class="kw2">var</span> i<span class="sy0">=</span><span class="nu0">0</span><span class="sy0">;</span> i<span class="sy0"><</span>oRSS.<span class="me1">count</span><span class="sy0">;</span> i<span class="sy0">++</span><span class="br0">)</span> <span class="br0">{</span>
s <span class="sy0">+=</span> Y.<span class="me1">Lang</span>.<span class="me1">substitute</span><span class="br0">(</span>t<span class="sy0">,</span> oRSS.<span class="me1">value</span>.<span class="me1">items</span><span class="br0">[</span>i<span class="br0">]</span><span class="br0">)</span><span class="sy0">;</span>
<span class="br0">}</span>
<span class="co1">//Output the string to the page:</span>
output.<span class="me1">set</span><span class="br0">(</span><span class="st0">"innerHTML"</span><span class="sy0">,</span> s<span class="br0">)</span><span class="sy0">;</span>
<span class="br0">}</span> <span class="kw1">else</span> <span class="br0">{</span>
<span class="co1">//No news stories were found in the feed.</span>
<span class="kw2">var</span> s <span class="sy0">=</span> <span class="st0">"<li>The RSS feed did not return any items.</li>"</span><span class="sy0">;</span>
<span class="br0">}</span>
<span class="br0">}</span>
<span class="co1">//In the event that the HTTP status returned is > 399, a</span>
<span class="co1">//failure is reported and this function is called:</span>
<span class="kw2">var</span> handleFailure <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">(</span>id<span class="sy0">,</span> o<span class="sy0">,</span> a<span class="br0">)</span> <span class="br0">{</span>
Y.<span class="me1">log</span><span class="br0">(</span><span class="st0">"ERROR "</span> <span class="sy0">+</span> id <span class="sy0">+</span> <span class="st0">" "</span> <span class="sy0">+</span> a<span class="sy0">,</span> <span class="st0">"info"</span><span class="sy0">,</span> <span class="st0">"example"</span><span class="br0">)</span><span class="sy0">;</span>
<span class="br0">}</span>
<span class="co1">//With all the aparatus in place, we can now configure our</span>
<span class="co1">//io call.</span>
<span class="kw2">var</span> cfg <span class="sy0">=</span> <span class="br0">{</span>
method<span class="sy0">:</span> <span class="st0">"GET"</span><span class="sy0">,</span>
xdr<span class="sy0">:</span> <span class="br0">{</span>
<span class="kw2">use</span><span class="sy0">:</span><span class="st0">'flash'</span><span class="sy0">,</span> <span class="co1">//This is the xdrConfig id we referenced above.</span>
responseXML<span class="sy0">:</span><span class="kw2">false</span> <span class="co1">//we're using JSON -- marginally faster, and</span>
<span class="co1">//supported by the Pipes API</span>
<span class="br0">}</span><span class="sy0">,</span>
on<span class="sy0">:</span> <span class="br0">{</span>
<span class="co1">//Our event handlers previously defined:</span>
start<span class="sy0">:</span> handleStart<span class="sy0">,</span>
success<span class="sy0">:</span> handleSuccess<span class="sy0">,</span>
failure<span class="sy0">:</span> handleFailure
<span class="br0">}</span>
<span class="br0">}</span><span class="sy0">;</span>
<span class="co1">//Wire the buttton to a click handler to fire our request each</span>
<span class="co1">//time the button is clicked:</span>
<span class="kw2">var</span> handleClick <span class="sy0">=</span> <span class="kw2">function</span><span class="br0">(</span>o<span class="br0">)</span> <span class="br0">{</span>
Y.<span class="me1">log</span><span class="br0">(</span><span class="st0">"Click detected; beginning io request to Yahoo! Pipes."</span><span class="sy0">,</span> <span class="st0">"info"</span><span class="sy0">,</span> <span class="st0">"example"</span><span class="br0">)</span><span class="sy0">;</span>
<span class="kw2">var</span> obj <span class="sy0">=</span> Y.<span class="me1">io</span><span class="br0">(</span>
<span class="co1">//this is a specific Pipes feed, populated with cycling news:</span>
<span class="st0">"http://pipes.yahooapis.com/pipes/pipe.run?_id=giWz8Vc33BG6rQEQo_NLYQ&_render=json"</span><span class="sy0">,</span>
cfg
<span class="br0">)</span><span class="sy0">;</span>
<span class="br0">}</span>
<span class="co1">//add the clickHandler as soon as the xdr Flash module has</span>
<span class="co1">//loaded:</span>
Y.<span class="me1">on</span><span class="br0">(</span><span class="st0">'io:xdrReady'</span><span class="sy0">,</span> <span class="kw2">function</span><span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span>
<span class="kw2">var</span> fetch <span class="sy0">=</span> Y.<span class="me1">Node</span>.<span class="me1">get</span><span class="br0">(</span><span class="st0">"#fetch"</span><span class="br0">)</span><span class="sy0">;</span>
fetch.<span class="me1">set</span><span class="br0">(</span><span class="st0">"disabled"</span><span class="sy0">,</span> <span class="kw2">false</span><span class="br0">)</span><span class="sy0">;</span>
Y.<span class="me1">on</span><span class="br0">(</span><span class="st0">"click"</span><span class="sy0">,</span> handleClick<span class="sy0">,</span> fetch<span class="br0">)</span><span class="sy0">;</span>
<span class="br0">}</span><span class="br0">)</span><span class="sy0">;</span>
<span class="br0">}</span>
<span class="br0">)</span><span class="sy0">;</span></pre></div><textarea id="syntax6-plain">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>
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<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>
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<h4>More IO Resources:</h4>
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<!-- <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>
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