title: How / When / Where should I use the hidden field?
body: <p>I have a dropdown that contain a list of people which contain also a unique id number like for example <code>data1</code> contain <code>ID = 5</code>. How the ID of 5 pass to the hidden field?.</p>
  
  <p>I'm having trouble understanding on how / where / when to use the hidden field like this</p>
  
  <p><code>&lt;input type="hidden" id="hidPersonId" /&gt;</code></p>
  
  <p>I'm always asking myself how the hidden field has the value when a scenario is adding a data. How did the hidden field get the value or ID. Please explain to me how did that happen if possible step by step?. Thanks.</p>