title: How to make a Bootstrap dropdown required?
body: <p>So, I've got following code for a dropdown box made with bootstrap:</p>
  
  <pre><code>&lt;div class="btn-group"&gt;
      &lt;button id="landKapitein" type="button" data-toggle="dropdown" class="btn btn-default dropdown-toggle"&gt;Land
          &lt;span class="caret"&gt;&lt;/span&gt;
      &lt;/button&gt;
      &lt;ul class="dropdown-menu"&gt;
          &lt;li&gt;&lt;a role="menuitem" tabindex="-1" href="#"&gt;België/Belgique&lt;/a&gt;&lt;/li&gt;
          &lt;li&gt;&lt;a role="menuitem" tabindex="-1" href="#"&gt;Deutschland&lt;/a&gt;&lt;/li&gt;
          &lt;li&gt;&lt;a role="menuitem" tabindex="-1" href="#"&gt;France&lt;/a&gt;&lt;/li&gt;
          &lt;li&gt;&lt;a role="menuitem" tabindex="-1" href="#"&gt;Nederland&lt;/a&gt;&lt;/li&gt;
          &lt;li&gt;&lt;a role="menuitem" tabindex="-1" href="#"&gt;United Kingdom&lt;/a&gt;&lt;/li&gt;
       &lt;/ul&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>Now I want to make it required to select something from this dropdown box before you can continue on. I've already done this for textboxes and radio buttons by just adding <em>required</em> to the  tag, but I don't have a tag like that here, so how do I do this then?</p>