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    copied!<p>I'm going to assume you're not asking to <em>minify</em>, but to <em>minimize</em> your code and make it more efficient. And since you say you have lots of data, and your option shows 8 choices while your code only deals with 2, I'm going to show you a way to handle your option selection easily.</p> <p>(This assumes you can change the HTML. If you can't, please make that clear.)</p> <p>First, add a common class to all the uls you want to deal with, and add a data attribute matching the option value</p> <pre><code>&lt;ul id="finance" class="dropDownOption" data-optionValue="2"&gt; &lt;li&gt;Financial Institution &amp; Services&lt;/li&gt; &lt;li&gt;International Financial Management&lt;/li&gt; &lt;li&gt;Working Capital Management&lt;/li&gt; &lt;li&gt;Project Work&lt;/li&gt; &lt;/ul&gt; &lt;ul id="HR" class="dropDownOption" data-optionValue="3"&gt; &lt;li&gt;Financial Institution &amp; Services HR&lt;/li&gt; &lt;li&gt;International Financial Management&lt;/li&gt; &lt;li&gt;Working Capital Management&lt;/li&gt; &lt;li&gt;Project Work&lt;/li&gt; &lt;/ul&gt; </code></pre> <p>Then your <code>slz.change</code> function becomes <em>much</em> easier and more robust:</p> <pre><code>slz.change(function () { $(".dropDownOption").hide(); $("ul[data-optionValue='" + this.value + "']").show(); } </code></pre> <p>Without modifying your markup, you can do some things, but they're riskier. <em>With the markup you've shown</em>, it's safe to just use <code>$("ul").hide()</code>, though if you haven't shown us all of it, that could be dangerous. For handling the value to the id, you would need a conversion function:</p> <pre><code>function convertValueToId(value) { switch (value) { case 1: return; // empty return, since this one is the "unselected" case case 2: return "finance"; case 3: return "HR"; // etc } } slz.change(function() { $("ul").hide(); var id = convertValueToId(this.value); if (id) { $("#" + id).show(); } } </code></pre>
 

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