title: How to make an array of items which are checked in checkbox
body: <p>I have some 20 <code>check boxes</code> ( dynamic number) in a HTML page which is <code>checked</code> by default. A user can <code>uncheck</code> it or leave it <code>checked</code>. At the end, there is a button to <code>submit</code>.</p>
  
  <p>How to get the items that are only checked at the time of submitting?</p>