title: Filter column by dropdown-values using DataTables
body: <p>I´m using the DataTables-plug (version 1.10.12) to display a table on my website.
  One column of the table, called "status", contains a dropdown-field with, like:</p>
  
  <pre><code>&lt;tr&gt;
  &lt;td&gt;
  ...
      &lt;select name="dropdown_status" id="139"&gt;
        &lt;option value="-1"&gt;canceled&lt;/option&gt;
        &lt;option value="1" selected&gt;open&lt;/option&gt;
        &lt;option value="2"&gt;in work&lt;/option&gt;
        &lt;option value="3"&gt;waiting&lt;/option&gt;
        &lt;option value="4"&gt;closed&lt;/option&gt;
      &lt;/select&gt;
  ...
  &lt;/td&gt;
  &lt;/tr&gt;
  </code></pre>
  
  <p>I want to filter by that <code>status</code>-column, e.g, show only rows that have the selected status <code>closed</code>. 
  The default filtering doesn´t work on such content of course, because it´s not plain text that needs to be filtered, but html-code that needs to be stripped.
  I have tried different approaches with selectors, the DataTables rendering- and searchfunction. I´m very new to JavaScript, AJAX, JQuery and DataTables and i´m running out of ideas. Any help would be greatly appreciated.</p>