title: Sort dropdown list
body: <p>I am trying to sort a dropdownlist (selector) in html.</p>
  
  <p>I have two lists, a pre-selection which then should be used to define the content of the secont list.</p>
  
  <p>A short code sample:</p>
  
  <pre><code>&lt;!doctype html&gt;
  &lt;html class=""&gt;
  &lt;head&gt;
  &lt;meta charset="utf-8"&gt;
  &lt;meta name="viewport" content="width=device-width, initial-scale=1"&gt;
  
  &lt;/head&gt;
  
  &lt;body&gt;
  &lt;table width=100% border="0"&gt;
    &lt;tr&gt;
    &lt;td&gt;&amp;nbsp;&lt;/td&gt;
      &lt;td&gt;Product&lt;/td&gt;
      &lt;td&gt;&lt;select name="product" id="product" width="300" style="width: 300px"&gt;
        &lt;option&gt;&lt;/option&gt;
        &lt;option id="TLX"&gt;TLX&lt;/option&gt;
        &lt;option id="FLX"&gt;FLX&lt;/option&gt;
        &lt;option id="MLX"&gt;MLX&lt;/option&gt;
      &lt;/select&gt;&lt;/td&gt;
      &lt;td&gt;&amp;nbsp;&lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
    &lt;td&gt;&amp;nbsp;&lt;/td&gt;
      &lt;td&gt;Power&lt;/td&gt;
      &lt;td&gt;&lt;select name="power" id="power" width="300" style="width: 300px"&gt;
        &lt;option&gt;&lt;/option&gt;
        &lt;option name="TLX"&gt;6&lt;/option&gt;
        &lt;option name="TLX"&gt;8&lt;/option&gt;
        &lt;option name="TLX"&gt;10&lt;/option&gt;
        &lt;option name="TLX"&gt;12&lt;/option&gt;
        &lt;option name="TLX"&gt;15&lt;/option&gt;
        &lt;option name="FLX"&gt;6&lt;/option&gt;
        &lt;option name="FLX"&gt;8&lt;/option&gt;
        &lt;option name="FLX"&gt;10&lt;/option&gt;
        &lt;option name="FLX"&gt;12&lt;/option&gt;
        &lt;option name="FLX"&gt;15&lt;/option&gt;
        &lt;option name="FLX"&gt;17&lt;/option&gt;
        &lt;option name="MLX"&gt;30&lt;/option&gt;
        &lt;option name="MLX"&gt;40&lt;/option&gt;
        &lt;option name="MLX"&gt;60&lt;/option&gt;
      &lt;/select&gt;&lt;/td&gt;
      &lt;td&gt;&amp;nbsp;&lt;/td&gt;
    &lt;/tr&gt;
  &lt;/table&gt;
  
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p>I want to b able to select the product and then must the power list be sortet accordingly.</p>
  
  <p>For instance if TLX is choosen then only 6, 8, 10, 12, and 15 are shown as possibilities in the second list.</p>