Adding new object members during parsing
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<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>Adding new object members during parsing</title>
<style type="text/css">
/*margin and padding on body element
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body {
margin:0;
padding:0;
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</style>
<link rel="stylesheet" type="text/css" href="yui_2.7.0b-lib/fonts/fonts-min.css" />
<script type="text/javascript" src="yui_2.7.0b-lib/yahoo-dom-event/yahoo-dom-event.js"></script>
<script type="text/javascript" src="yui_2.7.0b-lib/connection/connection-min.js"></script>
<script type="text/javascript" src="yui_2.7.0b-lib/json/json-min.js"></script>
<!--begin custom header content for this example-->
<style type="text/css">
#demo table {
border: 3px solid #89d;
border-collapse: collapse;
}
#demo caption {
margin: 3px 0;
font-weight: bold;
color: #333;
margin: 1em 0 1ex;
}
#demo table th {
background: #89d;
color: #fff;
padding: 1ex 1em;
}
#demo table td {
background: #fff;
border: 1px solid #ddd;
padding: .5ex 1ex;
}
</style>
<!--end custom header content for this example-->
</head>
<body class=" yui-skin-sam">
<h1>Adding new object members during parsing</h1>
<div class="exampleIntro">
<p>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.</p>
</div>
<!--BEGIN SOURCE CODE FOR EXAMPLE -->
<div id="demo">
<p>Choose a currency, then get the data</p>
<select id="currencies">
<option value="ARS">Argentine Peso</option>
<option value="AUD">Australian Dollar</option>
<option value="BRL">Brazilian Real</option>
<option value="GBP">British Pound</option>
<option value="CAD">Canadian Dollar</option>
<option value="CNY">Chinese Yuan</option>
<option value="COP">Colombian Peso</option>
<option value="HRK">Croatian Kuna</option>
<option value="CZK">Czech Koruna</option>
<option value="DKK">Danish Krone</option>
<option value="EEK">Estonian Kroon</option>
<option value="EUR">Euro</option>
<option value="HKD">Hong Kong Dollar</option>
<option value="HUF">Hungarian Forint</option>
<option value="ISK">Iceland Krona</option>
<option value="INR">Indian Rupee</option>
<option value="JPY">Japanese Yen</option>
<option value="KRW">Korean Won</option>
<option value="LVL">Latvian Lat</option>
<option value="LTL">Lithuanian Lita</option>
<option value="MYR">Malaysian Ringgit</option>
<option value="MXN">Mexican Peso</option>
<option value="NZD">New Zealand Dollar</option>
<option value="NOK">Norwegian Krone</option>
<option value="PHP">Philippine Peso</option>
<option value="PLN">Polish Zloty</option>
<option value="RUB">Russian Rouble</option>
<option value="SGD">Singapore Dollar</option>
<option value="SKK">Slovak Koruna</option>
<option value="ZAR">South African Rand</option>
<option value="LKR">Sri Lanka Rupee</option>
<option value="SEK">Swedish Krona</option>
<option value="TRY">Turkey Lira</option>
<option value="USD" selected="selected">U.S. Dollar</option>
<option value="CHF">Swiss Franc</option>
<option value="TWD">Taiwan Dollar</option>
<option value="THB">Thai Baht</option>
</select>
<input type="button" id="demo_go" value="Get Data">
<table cellspacing="0">
<caption>Inventory</caption>
<thead>
<tr>
<th>SKU</th>
<th>Item</th>
<th>Price (USD)</th>
<th>Price (<span>USD</span>)</th>
</tr>
</thead>
<tbody>
<tr><td colspan="4">Click <em>Get Data</em></td></tr>
</tbody>
</table>
</div>
<script type="text/javascript">
YAHOO.util.Event.onDOMReady(function () {
// Set up some shortcuts
var JSON = YAHOO.lang.JSON,
Dom = YAHOO.util.Dom,
Event = YAHOO.util.Event,
Demo;
Demo = YAHOO.namespace('demo').JSONReviver = {
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},
currency : 'USD',
formatCurrency : function (amt) {
amt += amt % 1 ? "0" : ".00";
return amt.substr(0,amt.indexOf('.')+3);
},
convert : function (k,v) {
// 'this' will refer to the object containing the key:value pair,
// so this will add a new object member while leaving the original
// in tact (but formatted to two decimal places). If the original
// is not needed, just return the converted value.
if (k === 'Price') {
var x = Math.round(v * Demo.rates[Demo.currency] * 100) / 100;
this.convertedPrice = Demo.formatCurrency(x); // added to item
return Demo.formatCurrency(v); // assigned to item.Price
}
return v;
},
updateTable : function (inventory) {
var demo = Dom.get('demo'),
tbl = demo.getElementsByTagName('table')[0],
tbody = tbl.getElementsByTagName('tbody')[0],
col_header = tbl.getElementsByTagName('span')[0],
tmp = document.createElement('div'),
html = ["<table><tbody>"],i,j = 1,l,item;
// Update the column header
col_header.innerHTML = Demo.currency;
if (inventory) {
for (i = 0, l = inventory.length; i < l; ++i) {
item = inventory[i];
html[j++] = '<tr><td>';
html[j++] = item.SKU;
html[j++] = '</td><td>';
html[j++] = item.Item;
html[j++] = '</td><td>';
html[j++] = item.Price;
html[j++] = '</td><td>';
html[j++] = item.convertedPrice;
html[j++] = '</td></tr>';
}
} else {
html[j++] = '<tr><td colspan="4">No Inventory data</td></tr>';
}
html[j] = "</tbody></table>";
tmp.innerHTML = html.join('');
tbl.replaceChild(tmp.getElementsByTagName('tbody')[0], tbody);
}
};
Event.on('demo_go','click', function (e) {
var self = this, // Cache this for the async callback closure
sel = Dom.get('currencies'); // Store the requested currency
// Disable the button temporarily
this.disabled = true;
// Store the requested currency
Demo.currency = sel.value;
YAHOO.util.Connect.asyncRequest('GET','yui_2.7.0b-assets/json-assets/data.php',{
timeout : 3000,
success : function (res) {
var inventory;
try {
inventory = JSON.parse(res.responseText,Demo.convert);
Demo.updateTable(inventory);
}
catch(e) {
alert("Error getting inventory data");
}
finally {
self.disabled = false;
}
},
failure : function () {
alert("Error getting inventory data");
}
});
});
});
</script>
</script>
<!--END SOURCE CODE FOR EXAMPLE -->
</body>
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