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262 lines
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html>
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<title>YUI Library Examples: JSON Utility: JSON with Connection Manager</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8">
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<script type="text/javascript">
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//enable passthrough of errors from YUI Event:
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if ((typeof YAHOO !== "undefined") && (YAHOO.util) && (YAHOO.util.Event)) {
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YAHOO.util.Event.throwErrors = true;
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}
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</script>
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</head>
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<body id="yahoo-com" class="yui-skin-sam">
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<div id="custom-doc" class="yui-t2">
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<div id="hd">
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<div id="ygunav">
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<p><em><a href="http://developer.yahoo.com/yui/">YUI Library Home</a></em></p>
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<form action="http://search.yahoo.com/search" id="sitesearchform">
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<input name="vs" type="hidden" value="developer.yahoo.com">
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<input name="vs" type="hidden" value="yuiblog.com">
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<label for="searchinput">Site Search (YDN & YUIBlog): </label>
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<input type="text" id="searchinput" name="p">
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<input type="submit" value="Search" id="searchsubmit" class="ygbt">
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</form> </div>
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<div id="ygma"><a href="../../"><img src="../../assets/yui.gif" border="0" height="38"></a></div>
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<div id="pagetitle"><h1>YUI Library Examples: JSON Utility: JSON with Connection Manager</h1></div>
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</div>
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<div id="bd">
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<div id="yui-main">
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<div class="yui-b">
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<div class="yui-ge">
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<div class="yui-u first example">
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<div class="promo">
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<h1>JSON Utility: JSON with Connection Manager</h1>
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<div class="exampleIntro">
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<p>A natural fit for the JSON Utility is working with the <a href="http://developer.yahoo.com/yui/connection/">Connection Manager</a>. In this example, we'll request JSON data from the server using Connection Manager's <code>asyncRequest</code> and parse the resulting JSON string data for processing.</p>
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<p>Click the Get Messages button to send the request to the server.</p>
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</div>
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<div class="example-container module ">
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<div class="hd exampleHd">
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<p class="newWindowButton yui-skin-sam"><!--<span id="newWindowLinkx"><span class="first-child">--><a href="json_connect_clean.html" target="_blank">View example in new window.</a><!--</span></span>-->
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</div> <div id="example-canvas" class="bd">
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<!--BEGIN SOURCE CODE FOR EXAMPLE =============================== -->
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<div id="demo">
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<input type="button" id="demo_btn" value="Get Messages">
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<div id="demo_msg"></div>
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</div>
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<script type="text/javascript">
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YAHOO.util.Event.on('demo_btn','click',function (e) {
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// Get the div element in which to report messages from the server
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var msg_section = YAHOO.util.Dom.get('demo_msg');
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msg_section.innerHTML = '';
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// Define the callbacks for the asyncRequest
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var callbacks = {
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success : function (o) {
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YAHOO.log("RAW JSON DATA: " + o.responseText);
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// Process the JSON data returned from the server
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var messages = [];
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try {
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messages = YAHOO.lang.JSON.parse(o.responseText);
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}
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catch (x) {
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alert("JSON Parse failed!");
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return;
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}
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YAHOO.log("PARSED DATA: " + YAHOO.lang.dump(messages));
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// The returned data was parsed into an array of objects.
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// Add a P element for each received message
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for (var i = 0, len = messages.length; i < len; ++i) {
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var m = messages[i];
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var p = document.createElement('p');
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var message_text = document.createTextNode(
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m.animal + ' says "' + m.message + '"');
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p.appendChild(message_text);
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msg_section.appendChild(p);
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}
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},
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failure : function (o) {
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if (!YAHOO.util.Connect.isCallInProgress(o)) {
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alert("Async call failed!");
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}
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},
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timeout : 3000
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}
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// Make the call to the server for JSON data
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YAHOO.util.Connect.asyncRequest('GET',"assets/jsonConnect.php", callbacks);
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});
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</script>
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<!--END SOURCE CODE FOR EXAMPLE =============================== -->
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</div>
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</div>
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</div>
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<h2 class="first">Use <code>YAHOO.lang.JSON.parse</code> in the success handler</h2>
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<p>Pass the XHR <code>responseText</code> to <code>YAHOO.lang.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>
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<textarea name="code" class="JScript" rows="1" cols="60">
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var callbacks = {
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// Successful XHR response handler
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success : function (o) {
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var messages = [];
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// Use the JSON Utility to parse the data returned from the server
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try {
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messages = YAHOO.lang.JSON.parse(o.responseText);
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}
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catch (x) {
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alert("JSON Parse failed!");
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return;
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}
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// The returned data was parsed into an array of objects.
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// Add a P element for each received message
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for (var i = 0, len = messages.length; i < len; ++i) {
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var m = messages[i];
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var p = document.createElement('p');
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var message_text = document.createTextNode(
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m.animal + ' says "' + m.message + '"');
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p.appendChild(message_text);
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msg_section.appendChild(p);
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}
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},
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...
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};
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// Make the call to the server for JSON data
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YAHOO.util.Connect.asyncRequest('GET',"assets/jsonConnect.php", callbacks);
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</textarea>
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<p>The <code>parse</code> method returns the native JavaScript object representation of the string data returned from the <code>asyncRequest</code>. In this case, the data is an array of object literals in this form:</p>
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<textarea name="code" class="JScript" rows="1" cols="60">
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[
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{ "animal" : "Cat", "message" : "Meow" },
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{ "animal" : "Dog", "message" : "Woof" },
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{ "animal" : "Cow", "message" : "Moo" },
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{ "animal" : "Duck", "message" : "Quack" },
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{ "animal" : "Lion", "message" : "Roar" }
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]
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</textarea>
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<h2>Configuration for This Example</h2>
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<p>You can load the necessary JavaScript and CSS for this example from Yahoo's servers. <a href="http://developer.yahoo.com/yui/articles/hosting/?dom&event&json&connection&MIN#configure">Click here to load the YUI Dependency Configurator with all of this example's dependencies preconfigured</a>.</p>
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</div>
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<div class="yui-u">
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<div id="loggerModule" class="yui-skin-sam">
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<h3 class="firstContent">YUI Logger Output:</h3>
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<div id="loggerDiv"></div>
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</div>
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<div id="examples">
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<h3>JSON Utility Examples:</h3>
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<div id="exampleToc">
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<ul>
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<li class='selected'><a href='../json/json_connect.html'>JSON with Connection Manager</a></li><li><a href='../json/json_freeze_thaw.html'>Rebuilding class instances from JSON data</a></li><li><a href='../json/json_convert_values.html'>Adding new object members during parsing</a></li> </ul>
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</div>
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</div>
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<div id="module">
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<h3>More JSON Utility Resources:</h3>
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<ul>
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<li><a href="http://developer.yahoo.com/yui/json/">User's Guide</a> (external)</li>
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<li><a href="../../docs/module_json.html">API Documentation</a></li>
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<li><a href="http://yuiblog.com/assets/pdf/cheatsheets/json.pdf">Cheat Sheet PDF</a> (external)</li></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 class="yui-b" id="tocWrapper">
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<!-- TABLE OF CONTENTS -->
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<div id="toc">
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<ul>
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<li class="sect first">Yahoo! UI Library</li><li class="item"><a title="The Yahoo! User Interface Library (YUI)" href="http://developer.yahoo.com/yui/">Home (external)</a></li><li class="item"><a title="The Yahoo! 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<p class="first">Copyright © 2010 Yahoo! Inc. All rights reserved.</p>
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