title: Jquery getting a hidden element's height
body: <p>I was trying to get a list of element's height value but it was returning 0.<br>
  I've done some research and saw that in order get  element's height, that element must be visible.<br>
  But I want to check its height when it's hidden. If its height is bigger than some value use some functions then make it visible. Is there any way to do this?</p>
  
  <p>I mean:</p>
  
  <ol>
  <li>Check hidden element's height.</li>
  <li>If it has OK value make it visible.</li>
  <li>If it doesn't have required value do some functions.</li>
  <li>Make it visible.</li>
  </ol>