title: jQuery : How to check if NO option was explicitly selected in a select box
body: <p>Is it possible to detect if no option was explicitly selected in a select box?</p>
  
  <p>I have tried these methods but none of them works:</p>
  
  <pre><code>&lt;select id="mySelect"&gt;
    &lt;option value="1"&gt;First&lt;/option&gt;
    &lt;option value="2"&gt;Second&lt;/option&gt;
    &lt;option value="3"&gt;Third&lt;/option&gt;
    &lt;option value="4"&gt;Fourth&lt;/option&gt;
  &lt;/select&gt;
  </code></pre>
  
  <p>Trial 1:</p>
  
  <pre><code>alert($('#select option:selected').length); // returns 1
  </code></pre>
  
  <p>Trial 2:</p>
  
  <pre><code>alert($('#select option[selected=selected]').length); // returns 1
  </code></pre>
  
  <p>Trial 3:</p>
  
  <pre><code>alert($('#select option:selected').attr('selected')); // returns 'selected'
  </code></pre>
  
  <p>Any ideas SO people?</p>