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    <p>IDs are ment to be unique per-document. Don't use them. Instead, use a general-purpose class attribute to identify individual applications and classes (again) inside these instances too point into specific parts of the application.</p> <p>Example HTML:</p> <pre><code>&lt;div class="app"&gt; &lt;a class="start-button" href="#"&gt;button1&lt;/a&gt; &lt;/div&gt; &lt;div class="app"&gt; &lt;a class="start-button" href="#"&gt;button2&lt;/a&gt; &lt;/div&gt; </code></pre> <p>Assuming the above, you can now determine the application in which the start button was clicked:</p> <pre><code>$('.start-button').click(function(event) { var app = $(event.target).closest('.app'); // Do stuff }); </code></pre> <p>Now if you want to do stuff inside that specific application, you can just use the <code>app</code> or some other top reference to keep the changes inside that app only.</p> <p>For instance, hiding the button when clicked:</p> <pre><code>$(app, '.start-button').hide(); </code></pre> <p>For a full running example, see this Fiddle: <a href="http://jsfiddle.net/8Xtue/2/" rel="nofollow">http://jsfiddle.net/8Xtue/2/</a></p> <p>What I'm presenting here is a simple foundation for a JavaScript application framework. If this is the style you are writing your applications, you might want to consider some ready framework like AngularJS (<a href="http://angularjs.org/" rel="nofollow">http://angularjs.org/</a>), which already provides you with a very well thought framework on working this kind of embeddable, JavaScript applications.</p>
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    1. POHow to "modularize" a jQuery app?
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    1. COThis is an interesting idea. Now, if someone clicks the button for appId 1, and something needs to happen, such as displaying a specific DIV, how would I access it the copy of that DIV in the appId1 and not appId2?
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      1. USLee Loftiss
    2. COThis solution works, but it is definitely over-engineered for the problem you're looking to solve. I avoid data attributes whenever I can, because they just add another layer of complexity to the HTML/JS interaction. This also makes it more difficult to re-use templated HTML, such as your start button here.
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      1. USginman
    3. CODefinitely agree on the over-engineering part. Edited to remove IDs and data-attributes since they are not actually required. I archived the old version here just in case somebody wants to look it up: http://jsfiddle.net/8Xtue/1/
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