title: How to determine if the `.post` request has been started and finish in jquery
body: <p>Is there a way on how I can determine if the <code>.post</code> request has started and finished.</p>
  
  <p>I mean, if i have a code: </p>
  
  <pre><code>$.post('address.php', { value: value }, function(data) {
      alert(data);    
  });
  </code></pre>
  
  <p>How can I know it was started for me to show the loading image and hide that loading image upon completion of the said <code>.post</code> request.</p>
  
  <p>I know there is a way on how to make this done because, most websites are using this kind of algorithm. And I want to write it in <code>jQuery</code>.</p>
  
  <p>Any inputs?</p>