title: textarea content is not captured on html form submission
body: <p>I am using a <code>textarea</code> tag to capture multi-line input in a <code>HTML</code> form but it is never captured with data from the other <code>input</code> fields! Why is this?</p>
  
  <pre><code>&lt;form id="contact_form" method="POST"&gt;
  &lt;!-- form-item --&gt;
      &lt;div class="form-item form-item--half"&gt;
          &lt;label class="form__label"&gt;email&lt;span&gt;*&lt;/span&gt;
          &lt;/label&gt;
          &lt;input class="form-control" type="email" name="input" required placeholder=""/&gt;
      &lt;/div&gt;&lt;!-- End / form-item --&gt;
  
  
      &lt;!-- form-item --&gt;
      &lt;div class="form-item form-item--half"&gt;
          &lt;label class="form__label"&gt;name&lt;span&gt;*&lt;/span&gt;
          &lt;/label&gt;
          &lt;input class="form-control" type="text" name="input" required placeholder=""/&gt;
      &lt;/div&gt;&lt;!-- End / form-item --&gt;
  
  
      &lt;!-- form-item --&gt;
      &lt;div class="form-item"&gt;
          &lt;label class="form__label"&gt;message&lt;span&gt;*&lt;/span&gt;
          &lt;/label&gt;
          &lt;textarea class="form-control" required placeholder=""&gt;&lt;/textarea&gt;
      &lt;/div&gt;&lt;!-- End / form-item --&gt;
  
  
      &lt;!-- form-item --&gt;
      &lt;div class="form-item"&gt;
          &lt;input class="md-btn btn-custom" type="submit" id="send_message_btn" value="Send message" &gt;
          &lt;/input&gt;
          &lt;span id="success_message" style="margin-left: 25px; color: #4BB543; display: none;"&gt;&amp;#x2713; Thanks for the email, we will be in touch promptly.&lt;/span&gt;
  
      &lt;/div&gt;&lt;!-- End / form-item --&gt;      
  &lt;/form&gt;
  </code></pre>
  
  <p>I capture the content via a <code>javascript</code> function:</p>
  
  <pre><code>var message = "";
  $("#send_message_btn").on("click", function() {
      message = $("#contact_form").serialize();
  }
  </code></pre>
  
  <p>However the message field is never captured in the serialized message. Any help?</p>