Advanced Use Case: Mixed Loading Methods

This example implements the YUI PHP Loader Utility to load the Calendar Control.

The workflow happens in four steps:

Include the YUI PHP Loader class file
Create a YAHOO_util_YUILoader instance: Set configuration flags as needed, call the load method with a list of components to load, notify the loader of any modules to avoid loading, and define what to do once the components are loaded (in this case, once the components are loaded we instantiate a Calendar Control on the page).
Ouput YUI CSS <link> nodes
Ouput YUI JavaScript <script> nodes

Here's what that looks like in terms of raw source — this is the full source code for this example:

<?PHP
include("loader.php");
$loader = new YAHOO_util_Loader("<?PHP echo $yuiCurrentVersion;?>");

//Specify YUI components to load
$loader->load("calendar");
?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
	<title>YUI PHP Loader Utility Advanced Example: Mixed Loading Methods</title>
	<?PHP
	//Output the CSS link tags
    echo $loader->css();
	?>
</head>

<h1>YUI PHP Loader Utility Advanced Example: Mixed Loading Methods</h1>

<p>In this example, we bring a YUI component onto the page using the <a href="http://developer.yahoo.com/yui/phploader/">YUI PHP Loader Utility</a>. 
This example implements YUI PHP Loader via a <code>YAHOO_util_Loader</code> instance.  We include the YUI PHP Loader class file, then specify in 
configuration which component we want loaded on the page — and what we want to do once it <em>is</em> loaded.  The main difference between 
this example and the previous advanced example is that we have mixed the component loading methods.  The Calender component requires the Yahoo, Dom, 
and Event modules.  In the previous example we let PHP Loader bring these into the document for us.  However, in this case we placed a static 
script include into the document that brings in these resources.  We do not wish to have PHP Loader duplicate the loading of these components so 
we utilize the <em>setLoaded</em> method to notify PHP Loader that we already have these components in the document and to skip loading them a second time.</p>

This code executes the following steps in order:

YUI PHP Loader loads taking the configuration settings into account. It gets instructions about what components are required and how to configure them.
YUI PHP Loader checks the dependency tree. Loader knows that the Calendar component requires the Yahoo Global Object, the Dom Collection, and the Event Utility components. Normally the loader would bring these dependencies into the page for us, but in this case the setLoaded method was used to have the loader avoid loading these resources since they were already included via a static script node.

YUI PHP Loader Utility: Mixed Loading Methods

Advanced Use Case: Mixed Loading Methods