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POHow to prevent multiple calls of a custom event handler when using the Observer Pattern in jQuery
 

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    <p>I am using jQuery to implement the observer pattern. I am triggering a custom event on $('body *') because it is not know what elements will respond to the event. That is, I want to enable my fellow developers to add code to respond to the event without me having to know about it. The problem I am encountering is that any child elements of an element bound to the custom event execute the handler. Is there a way to make sure that these child elements do not execute the handler? Keep in mind that I can't trigger on the element itself, because that element is unknown. I would like to avoid having the target elements add a class if possible.</p> <p>Here is some example code:</p> <pre><code>&lt;html&gt; &lt;head&gt; &lt;title&gt;test&lt;/title&gt; &lt;script src="http://code.jquery.com/jquery-1.4.4.js"&gt;&lt;/script&gt; &lt;script&gt; $(function() { $('#clickMe').click(function() { $('body *').trigger('myCustomEvent'); }); $('#someDiv').bind('myCustomEvent', function(e) { alert('someDiv responding to myCustomEvent'); }); $('#someOtherDivAddedBySomeOtherGuyLaterOn').bind('myCustomEvent', function() { alert('someOtherDivAddedBySomeOtherGuyLaterOn responding to myCustomEvent'); }); }); &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;div id="someDiv"&gt; &lt;span&gt;a span&lt;/span&gt; &lt;span&gt;another span&lt;/span&gt; &lt;/div&gt; &lt;div id="someOtherDivAddedBySomeOtherGuyLaterOn"&gt; &lt;span&gt;a span&lt;/span&gt; &lt;span&gt;another span&lt;/span&gt; &lt;/div&gt; &lt;p&gt;&lt;button type="button" id="clickMe"&gt;Click Me&lt;/button&gt;&lt;/p&gt; &lt;/body&gt; &lt;/html&gt; </code></pre>
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