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POUnderstand jQuery Tutorial Module Pattern example
 

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    <p>Considering the last code fragment (reported below) about module pattern published in the <a href="http://learn.jquery.com/code-organization/concepts/" rel="nofollow">Code Organization section of the Learning Center</a>, I'm trying to understand some aspect of the module in the example:</p> <ul> <li>The variable declarations (<code>$items</code>, <code>$container</code>...) are separated by <code>;</code> while the function declarations (<code>createContainer</code>, <code>buildUrl</code>, <code>showItem</code>, ....) are separated by <code>,</code>. Why? Is there a bracket problem?</li> <li>Why the name of the first three variables (<code>$items</code>, <code>$container</code> and <code>$currentItem</code>) starts with <code>$</code>? Does this imply a naming convention (since <code>javascript</code> allows the character <code>$</code>) used to identify a DOM fragment variable or is there some other reason?</li> <li>Why the function <code>createContainer</code> is declared using <code>var</code> while the other functions (<code>buildUrl</code>, <code>showItem</code>,...) doesn't have <code>var</code>?</li> </ul> <p>// Using the module pattern for a jQuery feature $( document ).ready(function() {</p> <pre><code>var feature = (function() { var $items = $("#myFeature li"); var $container = $("&lt;div class='container'&gt;&lt;/div&gt;"); var $currentItem = null; var urlBase = "/foo.php?item="; var createContainer = function() { var $i = $( this ); var $c = $container.clone().appendTo( $i ); $i.data( "container", $c ); }, buildUrl = function() { return urlBase + $currentItem.attr("id"); }, showItem = function() { var $currentItem = $( this ); getContent( showContent ); }, showItemByIndex = function( idx ) { $.proxy( showItem, $items.get( idx ) ); }, getContent = function( callback ) { $currentItem.data("container").load( buildUrl(), callback ); }, showContent = function() { $currentItem.data("container").show(); hideContent(); }, hideContent = function() { $currentItem.siblings().each(function() { $( this ).data("container").hide(); }); }; $items.each( createContainer ).click( showItem ); return { showItemByIndex: showItemByIndex }; })(); feature.showItemByIndex( 0 ); }); </code></pre>
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