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    <p>Let's make a working example from code you posted.</p> <p>The first thing I noticed is that both, the form and select tags have the same id attribute ( id value must be unique within the HTML document ), that’s why <code>"#portfolio-list"</code> selector don't work as expected, <code>change</code> event is triggered for the form and not for the select tag (if you are not sending data back to the server the form tag is not needed ).</p> <p>Furthermore, selectors for paragraps like <code>"#"+this.value</code> are starting with #, and options values start with # also, at the end the selector looks like <code>"##custom-exhibits</code>, and that is not a valid selector.</p> <p>In jQuery the <code>.val()</code> method is primarily used to get the values of form elements, <code>.value</code> is native JavaScript and although both methods are correct, if you are using jQuery then it is better to use his methods.</p> <pre><code>&lt;select name="portfolio-list" id="portfolio-list"&gt; &lt;option value="all" rel="all" class="current"&gt;All&lt;/option&gt; &lt;option value="custom-exhibits" rel="custom-exhibits" class="custom-exhibits"&gt;Custom Exhibits&lt;/option&gt; &lt;option value="permanent-installation" rel="permanent-installation" class="permanent-installation"&gt;Permanent Installation&lt;/option&gt; &lt;/select&gt; &lt;p id="all" &gt;paragraph1&lt;/p&gt; &lt;p id="custom-exhibits" &gt;paragraph2&lt;/p&gt; &lt;p id="permanent-installation" &gt;paragraph3&lt;/p&gt; &lt;script&gt; jQuery(function ($) { $("#portfolio-list").on( 'change', function(e) { // get selected option value var val = $(this).val(); // show element with that id $( '#'+val ).show(); // hide all other elements $('p').not( '#'+val ).hide(); }); }); &lt;/script&gt; </code></pre>
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