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<div id="pagetitle"><h1>YUI Library Examples: JSON: JSON with Y.io</h1></div>
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<h2>JSON: JSON with Y.io</h2>
<div id="example" class="promo">
<div class="example-intro">
<p>A natural fit for JSON is working with the <a href="http://developer.yahoo.com/yui/io/">io module</a>. In this example, we'll request JSON data from the server using the <code>Y.io</code> method and parse the resulting JSON string data for processing.</p>
<p>Click the Get Messages button to send the request to the server.</p>
</div>
<div class="module example-container ">
<div class="hd exampleHd">
<p class="newWindowButton yui-skin-sam">
<a href="json_connect_clean.html" target="_blank">View example in new window.</a>
</p>
</div> <div id="example-canvas" class="bd">
<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
<div id="demo">
<input type="button" id="demo_btn" value="Get Messages">
<div id="demo_msg"></div>
</div>
<script type="text/javascript">
YUI({base:"../../build/", timeout: 10000}).use("node", "io", "dump", "json-parse",function (Y) {
var target = Y.Node.get('#demo_msg');
var callback = {
timeout : 3000,
on : {
success : function (x,o) {
Y.log("RAW JSON DATA: " + o.responseText);
// Process the JSON data returned from the server
var messages = [],
html = '', i, l;
try {
messages = Y.JSON.parse(o.responseText);
}
catch (e) {
alert("JSON Parse failed!");
return;
}
Y.log("PARSED DATA: " + Y.Lang.dump(messages));
// The returned data was parsed into an array of objects.
// Add a P element for each received message
for (i=0, l=messages.length; i < l; ++i) {
html += '<p>' + messages[i].animal + ' says "' +
messages[i].message + '"</p>';
}
// Use the Node API to apply the new innerHTML to the target
target.set('innerHTML',html);
},
failure : function (x,o) {
alert("Async call failed!");
}
}
}
// Attach a click event listener to the button #demo_btn to send the request
Y.on('click',function (e) {
// Make the call to the server for JSON data
transaction = Y.io("assets/jsonConnect.php", callback);
},'#demo_btn');
});
</script>
<!--END SOURCE CODE FOR EXAMPLE =============================== -->
</div>
</div>
</div>
<h3 class="first">Use <code>Y.JSON.parse</code> in the success handler</h3>
<p>Pass the XHR <code>responseText</code> to <code>Y.JSON.parse</code> and capture the return value. Note that the parse method can throw a <code>SyntaxError</code> exception, so be sure to wrap the call in a <code>try/catch</code> block.</p>
<div id="syntax1" 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"><span class="co1">// Create business logic in a YUI sandbox using the '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">"node"</span><span class="sy0">,</span> <span class="st0">"io"</span><span class="sy0">,</span> <span class="st0">"dump"</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"> </div></li><li class="li1"><div class="de1"> <span class="co1">// capture the node that we'll display the messages in</span></div></li><li class="li2"><div class="de2"> <span class="kw2">var</span> target <span class="sy0">=</span> Y.<span class="me1">Node</span>.<span class="me1">get</span><span class="br0">(</span><span class="st0">'#demo_msg'</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">// Create the io callback/configuration</span></div></li><li class="li1"><div class="de1"> <span class="kw2">var</span> callback <span class="sy0">=</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> </div></li><li class="li2"><div class="de2"> timeout <span class="sy0">:</span> <span class="nu0">3000</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> </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"> success <span class="sy0">:</span> <span class="kw2">function</span> <span class="br0">(</span>x<span class="sy0">,</span>o<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">"RAW JSON DATA: "</span> <span class="sy0">+</span> o.<span class="me1">responseText</span><span class="br0">)</span><span class="sy0">;</span></div></li><li class="li2"><div class="de2"> </div></li><li class="li1"><div class="de1"> <span class="kw2">var</span> messages <span class="sy0">=</span> <span class="br0">[</span><span class="br0">]</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> html <span class="sy0">=</span> <span class="st0">''</span><span class="sy0">,</span> i<span class="sy0">,</span> l<span class="sy0">;</span></div></li><li class="li1"><div class="de1"> </div></li><li class="li1"><div class="de1"> <span class="co1">// Process the JSON data returned from the server</span></div></li><li class="li2"><div class="de2"> <span class="kw1">try</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> messages <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"> <span class="br0">}</span></div></li><li class="li1"><div class="de1"> <span class="kw1">catch</span> <span class="br0">(</span>e<span class="br0">)</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> <span class="kw3">alert</span><span class="br0">(</span><span class="st0">"JSON Parse failed!"</span><span class="br0">)</span><span class="sy0">;</span></div></li><li class="li2"><div class="de2"> <span class="kw1">return</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"> Y.<span class="me1">log</span><span class="br0">(</span><span class="st0">"PARSED DATA: "</span> <span class="sy0">+</span> Y.<span class="me1">Lang</span>.<span class="me1">dump</span><span class="br0">(</span>messages<span class="br0">)</span><span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> </div></li><li class="li2"><div class="de2"> <span class="co1">// The returned data was parsed into an array of objects.</span></div></li><li class="li1"><div class="de1"> <span class="co1">// Add a P element for each received message</span></div></li><li class="li1"><div class="de1"> <span class="kw1">for</span> <span class="br0">(</span>i<span class="sy0">=</span><span class="nu0">0</span><span class="sy0">,</span> l<span class="sy0">=</span>messages.<span class="me1">length</span><span class="sy0">;</span> i <span class="sy0"><</span> l<span class="sy0">;</span> <span class="sy0">++</span>i<span class="br0">)</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> html <span class="sy0">+=</span> <span class="st0">'<p>'</span> <span class="sy0">+</span> messages<span class="br0">[</span>i<span class="br0">]</span>.<span class="me1">animal</span> <span class="sy0">+</span> <span class="st0">' says &quot;'</span> <span class="sy0">+</span></div></li><li class="li1"><div class="de1"> messages<span class="br0">[</span>i<span class="br0">]</span>.<span class="me1">message</span> <span class="sy0">+</span> <span class="st0">'&quot;</p>'</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"> </div></li><li class="li1"><div class="de1"> <span class="co1">// Use the Node API to apply the new innerHTML to the target</span></div></li><li class="li1"><div class="de1"> target.<span class="me1">set</span><span class="br0">(</span><span class="st0">'innerHTML'</span><span class="sy0">,</span>html<span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span><span class="sy0">,</span></div></li><li class="li2"><div class="de2"> </div></li><li class="li1"><div class="de1"> failure <span class="sy0">:</span> <span class="kw2">function</span> <span class="br0">(</span>x<span class="sy0">,</span>o<span class="br0">)</span> <span class="br0">{</span></div></li><li class="li1"><div class="de1"> <span class="kw3">alert</span><span class="br0">(</span><span class="st0">"Async call failed!"</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="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">// Attach a click event listener to the button #demo_btn to send the request</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><span class="kw2">function</span> <span class="br0">(</span>e<span class="br0">)</span> <span class="br0">{</span></div></li><li class="li2"><div class="de2"> <span class="co1">// Make the call to the server for JSON data</span></div></li><li class="li1"><div class="de1"> transaction <span class="sy0">=</span> Y.<span class="me1">io</span><span class="br0">(</span><span class="st0">"assets/jsonConnect.php"</span><span class="sy0">,</span> callback<span class="br0">)</span><span class="sy0">;</span></div></li><li class="li1"><div class="de1"> <span class="br0">}</span><span class="sy0">,</span><span class="st0">'#demo_btn'</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="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 business logic in a YUI sandbox using the '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">"node"</span><span class="sy0">,</span> <span class="st0">"io"</span><span class="sy0">,</span> <span class="st0">"dump"</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">// capture the node that we'll display the messages in</span>
<span class="kw2">var</span> target <span class="sy0">=</span> Y.<span class="me1">Node</span>.<span class="me1">get</span><span class="br0">(</span><span class="st0">'#demo_msg'</span><span class="br0">)</span><span class="sy0">;</span>
<span class="co1">// Create the io callback/configuration</span>
<span class="kw2">var</span> callback <span class="sy0">=</span> <span class="br0">{</span>
timeout <span class="sy0">:</span> <span class="nu0">3000</span><span class="sy0">,</span>
on <span class="sy0">:</span> <span class="br0">{</span>
success <span class="sy0">:</span> <span class="kw2">function</span> <span class="br0">(</span>x<span class="sy0">,</span>o<span class="br0">)</span> <span class="br0">{</span>
Y.<span class="me1">log</span><span class="br0">(</span><span class="st0">"RAW JSON DATA: "</span> <span class="sy0">+</span> o.<span class="me1">responseText</span><span class="br0">)</span><span class="sy0">;</span>
<span class="kw2">var</span> messages <span class="sy0">=</span> <span class="br0">[</span><span class="br0">]</span><span class="sy0">,</span>
html <span class="sy0">=</span> <span class="st0">''</span><span class="sy0">,</span> i<span class="sy0">,</span> l<span class="sy0">;</span>
<span class="co1">// Process the JSON data returned from the server</span>
<span class="kw1">try</span> <span class="br0">{</span>
messages <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="br0">}</span>
<span class="kw1">catch</span> <span class="br0">(</span>e<span class="br0">)</span> <span class="br0">{</span>
<span class="kw3">alert</span><span class="br0">(</span><span class="st0">"JSON Parse failed!"</span><span class="br0">)</span><span class="sy0">;</span>
<span class="kw1">return</span><span class="sy0">;</span>
<span class="br0">}</span>
Y.<span class="me1">log</span><span class="br0">(</span><span class="st0">"PARSED DATA: "</span> <span class="sy0">+</span> Y.<span class="me1">Lang</span>.<span class="me1">dump</span><span class="br0">(</span>messages<span class="br0">)</span><span class="br0">)</span><span class="sy0">;</span>
<span class="co1">// The returned data was parsed into an array of objects.</span>
<span class="co1">// Add a P element for each received message</span>
<span class="kw1">for</span> <span class="br0">(</span>i<span class="sy0">=</span><span class="nu0">0</span><span class="sy0">,</span> l<span class="sy0">=</span>messages.<span class="me1">length</span><span class="sy0">;</span> i <span class="sy0"><</span> l<span class="sy0">;</span> <span class="sy0">++</span>i<span class="br0">)</span> <span class="br0">{</span>
html <span class="sy0">+=</span> <span class="st0">'<p>'</span> <span class="sy0">+</span> messages<span class="br0">[</span>i<span class="br0">]</span>.<span class="me1">animal</span> <span class="sy0">+</span> <span class="st0">' says &quot;'</span> <span class="sy0">+</span>
messages<span class="br0">[</span>i<span class="br0">]</span>.<span class="me1">message</span> <span class="sy0">+</span> <span class="st0">'&quot;</p>'</span><span class="sy0">;</span>
<span class="br0">}</span>
<span class="co1">// Use the Node API to apply the new innerHTML to the target</span>
target.<span class="me1">set</span><span class="br0">(</span><span class="st0">'innerHTML'</span><span class="sy0">,</span>html<span class="br0">)</span><span class="sy0">;</span>
<span class="br0">}</span><span class="sy0">,</span>
failure <span class="sy0">:</span> <span class="kw2">function</span> <span class="br0">(</span>x<span class="sy0">,</span>o<span class="br0">)</span> <span class="br0">{</span>
<span class="kw3">alert</span><span class="br0">(</span><span class="st0">"Async call failed!"</span><span class="br0">)</span><span class="sy0">;</span>
<span class="br0">}</span>
<span class="br0">}</span>
<span class="br0">}</span>
<span class="co1">// Attach a click event listener to the button #demo_btn to send the request</span>
Y.<span class="me1">on</span><span class="br0">(</span><span class="st0">'click'</span><span class="sy0">,</span><span class="kw2">function</span> <span class="br0">(</span>e<span class="br0">)</span> <span class="br0">{</span>
<span class="co1">// Make the call to the server for JSON data</span>
transaction <span class="sy0">=</span> Y.<span class="me1">io</span><span class="br0">(</span><span class="st0">"assets/jsonConnect.php"</span><span class="sy0">,</span> callback<span class="br0">)</span><span class="sy0">;</span>
<span class="br0">}</span><span class="sy0">,</span><span class="st0">'#demo_btn'</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="syntax1-plain">// Create business logic in a YUI sandbox using the 'io' and 'json' modules
YUI({base:"../../build/", timeout: 10000}).use("node", "io", "dump", "json-parse",function (Y) {
// capture the node that we'll display the messages in
var target = Y.Node.get('#demo_msg');
// Create the io callback/configuration
var callback = {
timeout : 3000,
on : {
success : function (x,o) {
Y.log("RAW JSON DATA: " + o.responseText);
var messages = [],
html = '', i, l;
// Process the JSON data returned from the server
try {
messages = Y.JSON.parse(o.responseText);
}
catch (e) {
alert("JSON Parse failed!");
return;
}
Y.log("PARSED DATA: " + Y.Lang.dump(messages));
// The returned data was parsed into an array of objects.
// Add a P element for each received message
for (i=0, l=messages.length; i < l; ++i) {
html += '<p>' + messages[i].animal + ' says "' +
messages[i].message + '"</p>';
}
// Use the Node API to apply the new innerHTML to the target
target.set('innerHTML',html);
},
failure : function (x,o) {
alert("Async call failed!");
}
}
}
// Attach a click event listener to the button #demo_btn to send the request
Y.on('click',function (e) {
// Make the call to the server for JSON data
transaction = Y.io("assets/jsonConnect.php", callback);
},'#demo_btn');
});</textarea></div>
<p>The <code>parse</code> method returns the native JavaScript object representation of the string data returned from the <code>Y.io</code> call. In this case, the data is an array of object literals in this form:</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="br0">[</span></div></li><li class="li1"><div class="de1"> <span class="br0">{</span> <span class="st0">"animal"</span> <span class="sy0">:</span> <span class="st0">"Cat"</span><span class="sy0">,</span> <span class="st0">"message"</span> <span class="sy0">:</span> <span class="st0">"Meow"</span> <span class="br0">}</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> <span class="br0">{</span> <span class="st0">"animal"</span> <span class="sy0">:</span> <span class="st0">"Dog"</span><span class="sy0">,</span> <span class="st0">"message"</span> <span class="sy0">:</span> <span class="st0">"Woof"</span> <span class="br0">}</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> <span class="br0">{</span> <span class="st0">"animal"</span> <span class="sy0">:</span> <span class="st0">"Cow"</span><span class="sy0">,</span> <span class="st0">"message"</span> <span class="sy0">:</span> <span class="st0">"Moo"</span> <span class="br0">}</span><span class="sy0">,</span></div></li><li class="li2"><div class="de2"> <span class="br0">{</span> <span class="st0">"animal"</span> <span class="sy0">:</span> <span class="st0">"Duck"</span><span class="sy0">,</span> <span class="st0">"message"</span> <span class="sy0">:</span> <span class="st0">"Quack"</span> <span class="br0">}</span><span class="sy0">,</span></div></li><li class="li1"><div class="de1"> <span class="br0">{</span> <span class="st0">"animal"</span> <span class="sy0">:</span> <span class="st0">"Lion"</span><span class="sy0">,</span> <span class="st0">"message"</span> <span class="sy0">:</span> <span class="st0">"Roar"</span> <span class="br0">}</span></div></li><li class="li1"><div class="de1"><span class="br0">]</span></div></li></ol></pre></div><div class="nonumbers"><pre class="javascript" style="font-family:monospace;"><span class="br0">[</span>
<span class="br0">{</span> <span class="st0">"animal"</span> <span class="sy0">:</span> <span class="st0">"Cat"</span><span class="sy0">,</span> <span class="st0">"message"</span> <span class="sy0">:</span> <span class="st0">"Meow"</span> <span class="br0">}</span><span class="sy0">,</span>
<span class="br0">{</span> <span class="st0">"animal"</span> <span class="sy0">:</span> <span class="st0">"Dog"</span><span class="sy0">,</span> <span class="st0">"message"</span> <span class="sy0">:</span> <span class="st0">"Woof"</span> <span class="br0">}</span><span class="sy0">,</span>
<span class="br0">{</span> <span class="st0">"animal"</span> <span class="sy0">:</span> <span class="st0">"Cow"</span><span class="sy0">,</span> <span class="st0">"message"</span> <span class="sy0">:</span> <span class="st0">"Moo"</span> <span class="br0">}</span><span class="sy0">,</span>
<span class="br0">{</span> <span class="st0">"animal"</span> <span class="sy0">:</span> <span class="st0">"Duck"</span><span class="sy0">,</span> <span class="st0">"message"</span> <span class="sy0">:</span> <span class="st0">"Quack"</span> <span class="br0">}</span><span class="sy0">,</span>
<span class="br0">{</span> <span class="st0">"animal"</span> <span class="sy0">:</span> <span class="st0">"Lion"</span><span class="sy0">,</span> <span class="st0">"message"</span> <span class="sy0">:</span> <span class="st0">"Roar"</span> <span class="br0">}</span>
<span class="br0">]</span></pre></div><textarea id="syntax2-plain">[
{ "animal" : "Cat", "message" : "Meow" },
{ "animal" : "Dog", "message" : "Woof" },
{ "animal" : "Cow", "message" : "Moo" },
{ "animal" : "Duck", "message" : "Quack" },
{ "animal" : "Lion", "message" : "Roar" }
]</textarea></div> </div>
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