title: jquery if all text is visible in div
body: <p>Im trying to write plugin truncating text to only one line, and give user ability to expand text, i tested lots of them but i dont find suitable for me , to slow, problems if jquery is not loaded etc.</p>
  
  <p>I done this in following way
  1. initial span
  Very Long text 
  w300 - means width 300</p>
  
  <ol>
  <li><p>$('.trunc').oneLine(); </li>
  <li><p>plugin create >
   
  Very Long text 
  [+] </p></li>
  </ol>
  
  <p>css 
  .trunc {overflow:hidden  !important;  white-space:nowrap !important; display:inline-block;}</p>
  
  <ol>
  <li>everything works ok 
  So i have only one line + i can expand</li>
  </ol>
  
  <p>PROBLEM
  i see expand sign[+] in every block, i want to see this only if text overflows block width I don't know how to determine if text is overflowing block. For example part of text is hidden.</p>
  
  <p>Regards 
  wicherqm </p>