title: Javascript - verify the values of fields with dynamic names
body: <p>I have a set of text fields qty with dynamic names: like <code>qty541</code> ; <code>qty542</code> ; <code>qty957</code>
  formed by the word: <code>"qty"</code> and the <code>product id</code></p>
  
  <p>How can I verify if all my qty fields are empty or not with Javascript ?</p>
  
  <p>Thanks a lot.</p>