title: Wordpress Filter multiple drop-down taxonomies to display custom field via ajax
body: <p>I currently have a custom post type named <code>newcpt</code>. This has 2 taxonomies, <code>region</code>and <code>city</code>.
  In region i have <code>regiona</code> and <code>regionb</code>, and in city i have <code>citya</code> and <code>cityb</code>.</p>
  
  <p>I currently am using the wp_dropdown_categories to get a drop-down of <code>regiona</code>.  Is there a quick or easy solution to display a second dropdown which only displays if it also has <code>regiona</code> as a taxonomy.</p>
  
  <p>So for example. I have a post of <code>testpost</code> which is in <code>regiona</code> and also in <code>citya</code>  when <code>regiona</code> is selected from the drop-down i would like the second dropdown to populate cities with this region, so in this case <code>citya</code>  </p>
  
  <p>Once a city is also selected, it will grab all the posts from this cpt with the matching taxonomies on the same page.   Any tips or helpful links are massively appreciated!! </p>