title: Modify jQuery.AJAX Values Before Send Using Form.serialize() for 'data'
body: <p>I have a jQuery.ajax() POST request, that runs on button click and has its <code>data</code> parameter set to <code>$(this).parents('form').serialize()</code>.</p>
  
  <p>There is one Textarea in the form that has a default placeholder, which I would like to replace with a blank value just before the AJAX request is sent. Is it possible to achieve this using the <code>beforeSend</code> event of jQuery.ajax?</p>