Extracting data from an HTML table
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title>Extracting data from an HTML table</title>
<style type="text/css">
/*margin and padding on body element
can introduce errors in determining
element position and are not recommended;
we turn them off as a foundation for YUI
CSS treatments. */
body {
margin:0;
padding:0;
}
</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/datasource/datasource-min.js"></script>
<!--begin custom header content for this example-->
<style type="text/css" class="highlight-ignore">
#demo table {
border: 1px solid #aaa;
border-collapse: collapse;
font-size: 80%;
}
#demo caption {
margin-top: 1em;
padding: .5ex 0;
font-size: 130%;
color: #369;
}
#demo td {
border: 1px solid #aaa;
padding: .5ex 1ex;
}
#demo th {
background: #ccc;
border: 1px solid #aaa;
padding: .5ex 1ex;
}
</style>
<!--end custom header content for this example-->
</head>
<body class=" yui-skin-sam">
<h1>Extracting data from an HTML table</h1>
<div class="exampleIntro">
<p>DataSource supports using a table in markup as its source of truth.</p>
<p>This example illustrates how to create a "pass-thru" DataSource instance to leverage the DOM walking and parsing routines inside in order to extract the table's data into a JavaScript array structure.</p>
</div>
<!--BEGIN SOURCE CODE FOR EXAMPLE -->
<div id="demo">
<button type="button" id="demo_load">Extract the table data</code></button>
<button type="button" id="demo_go" disabled="disabled">Get Total Amount Due</button>
<p>Total Amount Due: <em id="report">(click the Extract button)</em></p>
<table id="accounts">
<caption>Table in markup with data in it</caption>
<thead>
<tr>
<th>Due Date</th>
<th>Account Number</th>
<th>Quantity</th>
<th>Amount Due</th>
</tr>
</thead>
<tbody>
<tr>
<td>1/23/1999</td>
<td>29e8548592d8c82</td>
<td>12</td>
<td>$150.00</td>
</tr>
<tr>
<td>5/19/1999</td>
<td>83849</td>
<td>8</td>
<td>$60.00</td>
</tr>
<tr>
<td>8/9/1999</td>
<td>11348</td>
<td>1</td>
<td>-$34.99</td>
</tr>
<tr>
<td>1/23/2000</td>
<td>29e8548592d8c82</td>
<td>10</td>
<td>-$1.00</td>
</tr>
<tr>
<td>4/28/2000</td>
<td>37892857482836437378273</td>
<td>123</td>
<td>$33.32</td>
</tr>
<tr>
<td>1/23/2001</td>
<td>83849</td>
<td>5</td>
<td>-$15.00</td>
</tr>
<tr>
<td>9/30/2001</td>
<td>224747</td>
<td>14</td>
<td>$56.78</td>
</tr>
</tbody>
</table>
</div>
<script type="text/javascript">
YAHOO.util.Event.onDOMReady(function () {
// Shortcuts
var DataSource = YAHOO.util.DataSource,
Event = YAHOO.util.Event,
Dom = YAHOO.util.Dom;
YAHOO.example.data = null; // this is where the data will go
// Add a new parser to DataSource to parse numbers that are prefixed with
// currency symbols (or any other non-numeric characters)
DataSource.Parser.currency = function (cur) {
if (YAHOO.lang.isString(cur)) {
var neg = !cur.indexOf('-');
cur = (neg?-1:1) * cur.slice(neg).replace(/^[^0-9.]+|,/g,'');
} else if (!YAHOO.lang.isNumber(cur)) {
return 0;
}
return cur;
};
Event.on('demo_load','click',function (e) {
// Here's the pass-thru DataSource. Instantiate and immediately call
// sendRequest, passing a simple assignment function as the callback's
// success handler
new DataSource(Dom.get('accounts'), {
responseType : DataSource.TYPE_HTMLTABLE,
responseSchema : {
// Describe the object keys each record will have and what type
// of data to parse into the respective values
fields : [
{ key: 'due', parser: 'date' },
{ key: 'account' },
{ key: 'quantity', parser: 'number' },
{ key: 'amount', parser: 'currency' } // use our new parser
]
}
}).sendRequest(null,{
success : function (req,res) {
YAHOO.example.data = res.results;
}
});
YAHOO.log(YAHOO.lang.dump(YAHOO.example.data), "info", "example");
// The work is done and data is populated. Update the UI to allow for
// referencing the data structure.
Dom.get('demo_load').disabled = true;
Dom.get('demo_go').disabled = false;
Dom.get('report').innerHTML = "Table data loaded. Click <em>Get Total Amount Due</em>.";
});
Event.on('demo_go','click', function (e) {
var data = YAHOO.example.data || [],
total = 0,
i;
// Proof that we have a populated data object
for (i = data.length - 1; i >= 0; --i) {
total += data[i].amount;
}
Dom.get('report').innerHTML = '$' + total.toFixed(2);
});
});
</script>
<!--END SOURCE CODE FOR EXAMPLE -->
</body>
</html>
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