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<!DOCTYPE html> |
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<html lang="en"> |
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<head> |
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<meta charset="utf-8"> |
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<title>Example: Adding New Object Members During Parsing</title> |
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<link rel="stylesheet" href="http://fonts.googleapis.com/css?family=PT+Sans:400,700,400italic,700italic"> |
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<link rel="stylesheet" href="../../build/cssgrids/cssgrids-min.css"> |
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<link rel="stylesheet" href="../assets/css/main.css"> |
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<link rel="stylesheet" href="../assets/vendor/prettify/prettify-min.css"> |
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<link rel="shortcut icon" type="image/png" href="../assets/favicon.png"> |
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<script src="../../build/yui/yui-min.js"></script> |
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</head> |
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<body> |
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<!-- |
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<a href="https://github.com/yui/yui3"><img style="position: absolute; top: 0; right: 0; border: 0;" src="https://s3.amazonaws.com/github/ribbons/forkme_right_darkblue_121621.png" alt="Fork me on GitHub"></a> |
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--> |
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<div id="doc"> |
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<div id="hd"> |
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<h1><img src="http://yuilibrary.com/img/yui-logo.png"></h1> |
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</div> |
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<h1>Example: Adding New Object Members During Parsing</h1> |
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<div class="yui3-g"> |
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<div class="yui3-u-3-4"> |
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<div id="main"> |
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<div class="content"><div class="intro"> |
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<p> |
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This example shows how to use the <code>reviver</code> parameter in <code>JSON.parse()</code> to add new object members and format existing members during the parsing phase. |
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</p> |
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</div> |
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<div class="example yui3-skin-sam"> |
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<div id="demo"> |
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<p>Choose a currency, then get the data</p> |
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<select> |
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<option value="ARS">Argentine Peso</option> |
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<option value="AUD">Australian Dollar</option> |
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<option value="BRL">Brazilian Real</option> |
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<option value="GBP">British Pound</option> |
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<option value="CAD">Canadian Dollar</option> |
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<option value="CNY">Chinese Yuan</option> |
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<option value="COP">Colombian Peso</option> |
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<option value="HRK">Croatian Kuna</option> |
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<option value="CZK">Czech Koruna</option> |
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<option value="DKK">Danish Krone</option> |
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<option value="EEK">Estonian Kroon</option> |
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<option value="EUR">Euro</option> |
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<option value="HKD">Hong Kong Dollar</option> |
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<option value="HUF">Hungarian Forint</option> |
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<option value="ISK">Iceland Krona</option> |
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<option value="INR">Indian Rupee</option> |
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<option value="JPY">Japanese Yen</option> |
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<option value="KRW">Korean Won</option> |
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<option value="LVL">Latvian Lat</option> |
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<option value="LTL">Lithuanian Lita</option> |
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<option value="MYR">Malaysian Ringgit</option> |
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<option value="MXN">Mexican Peso</option> |
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<option value="NZD">New Zealand Dollar</option> |
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<option value="NOK">Norwegian Krone</option> |
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<option value="PHP">Philippine Peso</option> |
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<option value="PLN">Polish Zloty</option> |
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<option value="RUB">Russian Rouble</option> |
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<option value="SGD">Singapore Dollar</option> |
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<option value="SKK">Slovak Koruna</option> |
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<option value="ZAR">South African Rand</option> |
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<option value="LKR">Sri Lanka Rupee</option> |
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<option value="SEK">Swedish Krona</option> |
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<option value="TRY">Turkey Lira</option> |
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<option value="USD" selected="selected">U.S. Dollar</option> |
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<option value="CHF">Swiss Franc</option> |
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<option value="TWD">Taiwan Dollar</option> |
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<option value="THB">Thai Baht</option> |
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</select> |
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<input type="button" id="demo_go" value="Get Data"> |
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<table cellspacing="0"> |
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<caption>Inventory</caption> |
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<thead> |
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<tr> |
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<th>SKU</th> |
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<th>Item</th> |
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<th>Price (USD)</th> |
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<th>Price (<span>USD</span>)</th> |
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</tr> |
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</thead> |
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<tbody> |
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<tr><td colspan="4">Click <em>Get Data</em></td></tr> |
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</tbody> |
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</table> |
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</div> |
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<script> |
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YUI().use("node", "io", "json-parse",function (Y) { |
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// Safari 4.0.3's native JSON does not support adding members during parse, |
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// so use JavaScript implementation for consistency |
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Y.JSON.useNativeParse = false; |
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var example = { |
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rates : {"USD":1,"EUR":0.6661,"GBP":0.5207,"AUD":1.1225,"BRL":1.609,"NZD":1.4198,"CAD":1.0667,"CHF":1.0792,"CNY":6.8587 ,"DKK":4.9702,"HKD":7.8064,"INR":42.0168,"JPY":109.8901,"KRW":1000,"LKR":107.5269,"MXN":10.1317,"MYR" :3.3167,"NOK":5.3277,"SEK":6.2617,"SGD":1.4073,"THB":33.7838,"TWD":31.1526,"VEF":2.1445,"ZAR":7.6923 ,"BGN":1.3028,"CZK":16.0514,"EEK":10.4275,"HUF":158.7302,"LTL":2.2999,"LVL":0.4692,"PLN":2.1758,"RON" :2.3804,"SKK":20.2429,"ISK":4.8008,"HRK":81.3008,"RUB":24.3309,"TRY":1.1811,"PHP":44.2478,"COP":2000 ,"ARS":3.1289}, |
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currency : 'USD', |
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convert : function (k,v) { |
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// 'this' will refer to the object containing the key:value pair, |
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// so this step will add a new object member while leaving the original |
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// intact (but formatted to two decimal places). If the original |
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// is not needed, just return the converted value. |
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if (k === 'Price') { |
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var x = Math.round(v * example.rates[example.currency] * 100) / 100; |
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this.convertedPrice = x.toFixed(2); // added to item |
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return v.toFixed(2); // assigned to item.Price |
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} |
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return v; |
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}, |
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updateTable : function (inventory) { |
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// Update the column header |
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Y.one('#demo table th span').set('innerHTML',example.currency); |
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var tbody = Y.one('#demo table tbody'), |
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html = ['<table><tbody>'], |
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rowTemplate = '<tr><td>{SKU}</td><td>{Item}</td><td>{Price}</td><td>{convertedPrice}</td></tr>', |
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i, len; |
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if (inventory) { |
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for (i = 0, len = inventory.length; i < len; ++i) { |
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html.push(Y.Lang.sub(rowTemplate, inventory[i])); |
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} |
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} else { |
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html.push('<tr><td colspan="4">No Inventory data</td></tr>'); |
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} |
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html.push('</tbody></table>'); |
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tbody.replace(Y.Node.create(html.join('')).one('tbody')); |
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} |
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}; |
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Y.one('#demo_go').on('click', function (e) { |
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// Disable the button temporarily |
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this.set('disabled',true); |
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// Store the requested currency |
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var sel = Y.one("#demo select"); |
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example.currency = sel.get("options").item(sel.get("selectedIndex")).get("value"); |
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Y.io('../assets/json/json-convert-values-response.json',{ |
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timeout : 3000, |
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on : { |
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success : function (xid, res) { |
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var inventory; |
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try { |
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inventory = Y.JSON.parse(res.responseText,example.convert); |
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example.updateTable(inventory); |
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} |
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catch(e) { |
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alert("Error getting inventory data"); |
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} |
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finally { |
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Y.one('#demo_go').set('disabled',false); |
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} |
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}, |
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failure : function () { |
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alert("Error getting inventory data"); |
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} |
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} |
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}); |
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}); |
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// Expose example objects for inspection |
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YUI.example = example; |
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}); |
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</script> |
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</div> |
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<h2>The Data</h2> |
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<p> |
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The data returned from the server will be a JSON string containing this object structure: |
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</p> |
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<pre class="code prettyprint lang-json">[ |
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{"SKU":"23-23874", "Price":23.99, "Item":"Helmet"}, |
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{"SKU":"48-38835", "Price":14.97, "Item":"Football"}, |
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{"SKU":"84-84848", "Price":3.49, "Item":"Goggles"}, |
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{"SKU":"84-84843", "Price":183, "Item":"Badminton Set"}, |
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{"SKU":"84-39321", "Price":6.79, "Item":"Tennis Balls"}, |
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{"SKU":"39-48949", "Price":618, "Item":"Snowboard"}, |
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{"SKU":"99-28128", "Price":78.99, "Item":"Cleats"}, |
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{"SKU":"83-48281", "Price":4.69, "Item":"Volleyball"}, |
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{"SKU":"89-32811", "Price":0.59, "Item":"Sweatband"}, |
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{"SKU":"28-22847", "Price":779.98, "Item":"Golf Set"}, |
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{"SKU":"38-38281", "Price":8.25, "Item":"Basketball Shorts"}, |
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{"SKU":"82-38333", "Price":1.39, "Item":"Lip balm"}, |
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{"SKU":"21-38485", "Price":0.07, "Item":"Ping Pong ball"}, |
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{"SKU":"83-38285", "Price":3.99, "Item":"Hockey Puck"} |
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]</pre> |
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<h2>Create a <code>reviver</code> function</h2> |
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<p> |
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We'll contain all the moving parts in an <code>example</code> namespace. In it, we'll include the currency exchange rates and a function to reference the rates to add a new member to the JSON response as it is being parsed. |
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</p> |
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<pre class="code prettyprint">YUI().use("node", "io", "json-parse",function (Y) { |
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var example = { |
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rates : {"USD":1,"EUR":0.6661,...,"COP":2000 ,"ARS":3.1289}, |
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currency : 'USD', // updated by the select element |
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convert : function (k,v) { |
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// 'this' will refer to the object containing the key:value pair, |
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// so this step will add a new object member while leaving the original |
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// intact (but formatted to two decimal places). If the original |
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// is not needed, just return the converted value. |
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if (k === 'Price') { |
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var x = Math.round(v * example.rates[example.currency] * 100) / 100; |
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this.convertedPrice = x.toFixed(2); // added to item |
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return v.toFixed(2); // assigned to item.Price |
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} |
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return v; |
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}, |
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… |
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}; |
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…</pre> |
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<h2>Sending the request and parsing the JSON response</h2> |
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<p> |
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When the <em>Get Data</em> button is clicked, we send an io request for the JSON data, and in our <code>success</code> handler, pass our conversion function to <code>JSON.parse()</code> with the response text. The resulting inventory records will have an additional member, <code>convertedPrice</code>. This data is then passed to a UI method to update the inventory table. |
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</p> |
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<pre class="code prettyprint">Y.one('#demo_go').on('click', function (e) { |
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// Disable the button temporarily |
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this.set('disabled',true); |
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// Store the requested currency |
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var sel = Y.one("#demo select"); |
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example.currency = sel.get("options").item(sel.get("selectedIndex")).get("value"); |
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// Send the request for the JSON data |
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Y.io('../assets/json/json-convert-values-response.json',{ |
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timeout : 3000, |
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on : { |
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success : function (xid, res) { |
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var inventory; |
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try { |
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inventory = Y.JSON.parse(res.responseText,example.convert); |
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example.updateTable(inventory); |
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} |
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catch(e) { |
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alert("Error getting inventory data"); |
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} |
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finally { |
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Y.one('#demo_go').set('disabled',false); |
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} |
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}, |
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failure : function () { |
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alert("Error getting inventory data"); |
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} |
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} |
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}); |
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}); |
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}); // End YUI(..).use(..,function (Y) {</pre> |
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<h2>Complete Example Source</h2> |
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<pre class="code prettyprint"><div id="demo"> |
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<p>Choose a currency, then get the data</p> |
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<select> |
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<option value="ARS">Argentine Peso</option> |
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<option value="AUD">Australian Dollar</option> |
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<option value="BRL">Brazilian Real</option> |
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<option value="GBP">British Pound</option> |
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<option value="CAD">Canadian Dollar</option> |
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<option value="CNY">Chinese Yuan</option> |
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<option value="COP">Colombian Peso</option> |
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<option value="HRK">Croatian Kuna</option> |
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<option value="CZK">Czech Koruna</option> |
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<option value="DKK">Danish Krone</option> |
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<option value="EEK">Estonian Kroon</option> |
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<option value="EUR">Euro</option> |
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<option value="HKD">Hong Kong Dollar</option> |
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<option value="HUF">Hungarian Forint</option> |
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<option value="ISK">Iceland Krona</option> |
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<option value="INR">Indian Rupee</option> |
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<option value="JPY">Japanese Yen</option> |
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<option value="KRW">Korean Won</option> |
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<option value="LVL">Latvian Lat</option> |
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<option value="LTL">Lithuanian Lita</option> |
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<option value="MYR">Malaysian Ringgit</option> |
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<option value="MXN">Mexican Peso</option> |
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<option value="NZD">New Zealand Dollar</option> |
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<option value="NOK">Norwegian Krone</option> |
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<option value="PHP">Philippine Peso</option> |
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<option value="PLN">Polish Zloty</option> |
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<option value="RUB">Russian Rouble</option> |
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<option value="SGD">Singapore Dollar</option> |
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<option value="SKK">Slovak Koruna</option> |
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<option value="ZAR">South African Rand</option> |
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<option value="LKR">Sri Lanka Rupee</option> |
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<option value="SEK">Swedish Krona</option> |
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<option value="TRY">Turkey Lira</option> |
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<option value="USD" selected="selected">U.S. Dollar</option> |
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<option value="CHF">Swiss Franc</option> |
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<option value="TWD">Taiwan Dollar</option> |
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<option value="THB">Thai Baht</option> |
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</select> |
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<input type="button" id="demo_go" value="Get Data"> |
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<table cellspacing="0"> |
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<caption>Inventory</caption> |
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<thead> |
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<tr> |
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<th>SKU</th> |
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<th>Item</th> |
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<th>Price (USD)</th> |
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<th>Price (<span>USD</span>)</th> |
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</tr> |
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</thead> |
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<tbody> |
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<tr><td colspan="4">Click <em>Get Data</em></td></tr> |
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</tbody> |
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</table> |
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</div> |
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<script> |
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YUI().use("node", "io", "json-parse",function (Y) { |
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337 |
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// Safari 4.0.3's native JSON does not support adding members during parse, |
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// so use JavaScript implementation for consistency |
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Y.JSON.useNativeParse = false; |
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var example = { |
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rates : {"USD":1,"EUR":0.6661,"GBP":0.5207,"AUD":1.1225,"BRL":1.609,"NZD":1.4198,"CAD":1.0667,"CHF":1.0792,"CNY":6.8587 ,"DKK":4.9702,"HKD":7.8064,"INR":42.0168,"JPY":109.8901,"KRW":1000,"LKR":107.5269,"MXN":10.1317,"MYR" :3.3167,"NOK":5.3277,"SEK":6.2617,"SGD":1.4073,"THB":33.7838,"TWD":31.1526,"VEF":2.1445,"ZAR":7.6923 ,"BGN":1.3028,"CZK":16.0514,"EEK":10.4275,"HUF":158.7302,"LTL":2.2999,"LVL":0.4692,"PLN":2.1758,"RON" :2.3804,"SKK":20.2429,"ISK":4.8008,"HRK":81.3008,"RUB":24.3309,"TRY":1.1811,"PHP":44.2478,"COP":2000 ,"ARS":3.1289}, |
|
|
344 |
|
|
|
345 |
currency : 'USD', |
|
|
346 |
|
|
|
347 |
convert : function (k,v) { |
|
|
348 |
// 'this' will refer to the object containing the key:value pair, |
|
|
349 |
// so this step will add a new object member while leaving the original |
|
|
350 |
// intact (but formatted to two decimal places). If the original |
|
|
351 |
// is not needed, just return the converted value. |
|
|
352 |
if (k === 'Price') { |
|
|
353 |
var x = Math.round(v * example.rates[example.currency] * 100) / 100; |
|
|
354 |
this.convertedPrice = x.toFixed(2); // added to item |
|
|
355 |
return v.toFixed(2); // assigned to item.Price |
|
|
356 |
} |
|
|
357 |
return v; |
|
|
358 |
}, |
|
|
359 |
|
|
|
360 |
updateTable : function (inventory) { |
|
|
361 |
// Update the column header |
|
|
362 |
Y.one('#demo table th span').set('innerHTML',example.currency); |
|
|
363 |
|
|
|
364 |
var tbody = Y.one('#demo table tbody'), |
|
|
365 |
html = ['<table><tbody>'], |
|
|
366 |
rowTemplate = '<tr><td>{SKU}</td><td>{Item}</td><td>{Price}</td><td>{convertedPrice}</td></tr>', |
|
|
367 |
i, len; |
|
|
368 |
|
|
|
369 |
if (inventory) { |
|
|
370 |
for (i = 0, len = inventory.length; i < len; ++i) { |
|
|
371 |
html.push(Y.Lang.sub(rowTemplate, inventory[i])); |
|
|
372 |
} |
|
|
373 |
} else { |
|
|
374 |
html.push('<tr><td colspan="4">No Inventory data</td></tr>'); |
|
|
375 |
} |
|
|
376 |
|
|
|
377 |
html.push('</tbody></table>'); |
|
|
378 |
|
|
|
379 |
tbody.replace(Y.Node.create(html.join('')).one('tbody')); |
|
|
380 |
} |
|
|
381 |
}; |
|
|
382 |
|
|
|
383 |
Y.one('#demo_go').on('click', function (e) { |
|
|
384 |
// Disable the button temporarily |
|
|
385 |
this.set('disabled',true); |
|
|
386 |
|
|
|
387 |
// Store the requested currency |
|
|
388 |
var sel = Y.one("#demo select"); |
|
|
389 |
example.currency = sel.get("options").item(sel.get("selectedIndex")).get("value"); |
|
|
390 |
|
|
|
391 |
Y.io('../assets/json/json-convert-values-response.json',{ |
|
|
392 |
timeout : 3000, |
|
|
393 |
on : { |
|
|
394 |
success : function (xid, res) { |
|
|
395 |
var inventory; |
|
|
396 |
try { |
|
|
397 |
inventory = Y.JSON.parse(res.responseText,example.convert); |
|
|
398 |
|
|
|
399 |
example.updateTable(inventory); |
|
|
400 |
} |
|
|
401 |
catch(e) { |
|
|
402 |
alert("Error getting inventory data"); |
|
|
403 |
} |
|
|
404 |
finally { |
|
|
405 |
Y.one('#demo_go').set('disabled',false); |
|
|
406 |
} |
|
|
407 |
}, |
|
|
408 |
failure : function () { |
|
|
409 |
alert("Error getting inventory data"); |
|
|
410 |
} |
|
|
411 |
} |
|
|
412 |
}); |
|
|
413 |
}); |
|
|
414 |
|
|
|
415 |
// Expose example objects for inspection |
|
|
416 |
YUI.example = example; |
|
|
417 |
}); |
|
|
418 |
</script></pre> |
|
|
419 |
|
|
|
420 |
</div> |
|
|
421 |
</div> |
|
|
422 |
</div> |
|
|
423 |
|
|
|
424 |
<div class="yui3-u-1-4"> |
|
|
425 |
<div class="sidebar"> |
|
|
426 |
|
|
|
427 |
|
|
|
428 |
|
|
|
429 |
<div class="sidebox"> |
|
|
430 |
<div class="hd"> |
|
|
431 |
<h2 class="no-toc">Examples</h2> |
|
|
432 |
</div> |
|
|
433 |
|
|
|
434 |
<div class="bd"> |
|
|
435 |
<ul class="examples"> |
|
|
436 |
|
|
|
437 |
|
|
|
438 |
<li data-description="Use JSON to parse data received via XMLHttpRequest via Y.io calls — a simple JSON use case."> |
|
|
439 |
<a href="json-connect.html">JSON with Y.io</a> |
|
|
440 |
</li> |
|
|
441 |
|
|
|
442 |
|
|
|
443 |
|
|
|
444 |
<li data-description="Use the replacer and reviver parameters to reconstitute object instances that have been serialized to JSON."> |
|
|
445 |
<a href="json-freeze-thaw.html">Rebuilding Class Instances from JSON Data</a> |
|
|
446 |
</li> |
|
|
447 |
|
|
|
448 |
|
|
|
449 |
|
|
|
450 |
<li data-description="Use a currency conversion calculation to add a new price member to a JSON response, demonstrating how JSON data, once retrieved, can be transformed during parsing."> |
|
|
451 |
<a href="json-convert-values.html">Adding New Object Members During Parsing</a> |
|
|
452 |
</li> |
|
|
453 |
|
|
|
454 |
|
|
|
455 |
|
|
|
456 |
|
|
|
457 |
|
|
|
458 |
|
|
|
459 |
</ul> |
|
|
460 |
</div> |
|
|
461 |
</div> |
|
|
462 |
|
|
|
463 |
|
|
|
464 |
|
|
|
465 |
<div class="sidebox"> |
|
|
466 |
<div class="hd"> |
|
|
467 |
<h2 class="no-toc">Examples That Use This Component</h2> |
|
|
468 |
</div> |
|
|
469 |
|
|
|
470 |
<div class="bd"> |
|
|
471 |
<ul class="examples"> |
|
|
472 |
|
|
|
473 |
|
|
|
474 |
|
|
|
475 |
|
|
|
476 |
|
|
|
477 |
|
|
|
478 |
|
|
|
479 |
|
|
|
480 |
<li data-description="A basic todo list built with the Model, Model List, and View components."> |
|
|
481 |
<a href="../app/app-todo.html">Todo List</a> |
|
|
482 |
</li> |
|
|
483 |
|
|
|
484 |
|
|
|
485 |
|
|
|
486 |
<li data-description="Portal style example using Drag & Drop Event Bubbling and Animation."> |
|
|
487 |
<a href="../dd/portal-drag.html">Portal Style Example</a> |
|
|
488 |
</li> |
|
|
489 |
|
|
|
490 |
|
|
|
491 |
</ul> |
|
|
492 |
</div> |
|
|
493 |
</div> |
|
|
494 |
|
|
|
495 |
</div> |
|
|
496 |
</div> |
|
|
497 |
</div> |
|
|
498 |
</div> |
|
|
499 |
|
|
|
500 |
<script src="../assets/vendor/prettify/prettify-min.js"></script> |
|
|
501 |
<script>prettyPrint();</script> |
|
|
502 |
|
|
|
503 |
<script> |
|
|
504 |
YUI.Env.Tests = { |
|
|
505 |
examples: [], |
|
|
506 |
project: '../assets', |
|
|
507 |
assets: '../assets/json', |
|
|
508 |
name: 'json-convert-values', |
|
|
509 |
title: 'Adding New Object Members During Parsing', |
|
|
510 |
newWindow: '', |
|
|
511 |
auto: false |
|
|
512 |
}; |
|
|
513 |
YUI.Env.Tests.examples.push('json-connect'); |
|
|
514 |
YUI.Env.Tests.examples.push('json-freeze-thaw'); |
|
|
515 |
YUI.Env.Tests.examples.push('json-convert-values'); |
|
|
516 |
YUI.Env.Tests.examples.push('app-todo'); |
|
|
517 |
YUI.Env.Tests.examples.push('portal-drag'); |
|
|
518 |
|
|
|
519 |
</script> |
|
|
520 |
<script src="../assets/yui/test-runner.js"></script> |
|
|
521 |
|
|
|
522 |
|
|
|
523 |
|
|
|
524 |
</body> |
|
|
525 |
</html> |