title: Focusing first control in the form using jquery
body: <p>Using jquery how do I focus the first element (edit field, text area, dropdown field, etc)
  in the form when the page load?</p>
  
  <p>Something like:</p>
  
  <pre><code>document.forms[0].elements[0].focus();
  </code></pre>
  
  <p>but using jquery.</p>
  
  <p>Another requirement, don't focus the first element when the form has class="filter".</p>