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	<title>DataTables example - API plug-in methods</title>
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$.fn.dataTable.Api.register( 'column().data().sum()', function () {
	return this.reduce( function (a, b) {
		var x = parseFloat( a ) || 0;
		var y = parseFloat( b ) || 0;
		return x + y;
	} );
} );

/* Init the table and fire off a call to get the hidden nodes. */
$(document).ready(function() {
	var table = $('#example').DataTable();
	
	$('<button>Click to sum age in all rows</button>')
		.prependTo( '#demo' )
		.on( 'click', function () {
			alert( 'Column sum is: '+ table.column( 3 ).data().sum() );
		} );

	$('<button>Click to sum age of visible rows</button>')
		.prependTo( '#demo' )
		.on( 'click', function () {
			alert( 'Column sum is: '+ table.column( 3, {page:'current'} ).data().sum() );
		} );
} );


	</script>
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<body class="dt-example">
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		<section>
			<h1>DataTables example <span>API plug-in methods</span></h1>
			<div class="info">
				<p>The DataTables API is designed to be fully extensible, with custom functions being very easy to add using the <code>$.fn.dataTable.Api.register</code> function.
				This function takes two arguments; the first being the name of the method to be added and its chaining hierarchy, and the second the function itself.</p>
				<p>This example shows how a <code>sum()</code> method can easily be added to the Api so you can get the sum of a column in a single line: