title: how to abort a $.post request
body: <p>i have this event on keydown:</p>
  
  <pre><code>$.post("search.php", { s: $('#box_s').val()},
                 function(data) {
                    /**/
                 }
  });
  </code></pre>
  
  <p>the problem is that as many keydown as many requests and sometimes older requests override recent requests results</p>
  
  <p>so i would need to</p>
  
  <pre><code>$('input#box_s').keydown(function(){
       abort_previous_post();
       $.post("search.php", { s: $('#box_s').val()},
                     function(data) {
                        /**/
                     }
      });
  });
  </code></pre>
  
  <p>is that posible?</p>