title: Why does my jQuery filter only work once on this select element?
body: <p>I'm trying to filter results based on what a user selects in a select form. Here is my HTML:</p>
  
  <pre><code>&lt;li&gt;
  Colour Options
  &lt;select name="item_options[cf_product_option_colour]" id="product-multiple-1"&gt;
      &lt;option&gt;Choose Option&lt;/option&gt;
      &lt;option value="Red"&gt;Red&lt;/option&gt;
      &lt;option value="Green"&gt;Green&lt;/option&gt;
      &lt;option value="Blue"&gt;Blue&lt;/option&gt;
  &lt;/select&gt;
  &lt;/li&gt;
  &lt;li&gt;
  Size Options
  &lt;select name="item_options[cf_product_option_size]" id="product-multiple-2"&gt;
      &lt;option&gt;Choose Option&lt;/option&gt;
      &lt;option value="75643" class="Red"&gt;5ml - £1.00&lt;/option&gt;
      &lt;option value="765432" class="Red"&gt;10ml - £2.00&lt;/option&gt;
      &lt;option value="867564534" class="Red"&gt;15ml - £3.00&lt;/option&gt;
      &lt;option value="5434" class="Red"&gt;20ml - £4.00&lt;/option&gt;
      &lt;option value="6453234" class="Green"&gt;5ml - £1.00&lt;/option&gt;
      &lt;option value="45256536" class="Green"&gt;10ml - £2.00&lt;/option&gt;
      &lt;option value="52454" class="Green"&gt;15ml - £3.00&lt;/option&gt;
      &lt;option value="6543754" class="Blue"&gt;5ml - £1.00&lt;/option&gt;
      &lt;option value="4316243" class="Blue"&gt;10ml - £2.00&lt;/option&gt;
  &lt;/select&gt;
  &lt;/li&gt;
  </code></pre>
  
  <p>And the jQuery:</p>
  
  <pre><code>$("#product-multiple-1").change(function(){
      var matches = $("#product-multiple-2 &gt; option." + $(this).val());
      $("#product-multiple-2").empty().html(matches);
      console.log(matches);
      return matches;
  });
  </code></pre>
  
  <p>What should happen, is when I choose a colour option, it changes the size options drop down. This seems to work when I choose the first colour option, but then if I choose another colour option, it doesn't do anything.</p>
  
  <p>I inspected it and looked at the console. It seems to run the variable once, but then when I try select another option, the variable is blank and in console it just displays <code>[]</code></p>
  
  <p>Any help would be good :)</p>