title: Bootstrap 3: Catch event when navbar is collapsed or expanded
body: <p>Using Bootstrap 3:</p>
  
  <p>Is it possible to catch when the navbar is collapsed/expanded?</p>
  
  <p>I can't seam to find an event for this.</p>
  
  <p>Edit:</p>
  
  <p>I have a logo that is 90px heigh, so the navbar must be around 110px heigh. </p>
  
  <p>To place the menu links close to the main content, I therefor have a margin-top at 60px. When it collapse, I want the three dashes (icon-bar) to have a margin-top of 60px also. When doing that, the menu suddently is 60px + 60px = 120px down - and that is 60px too much.  So I want to catch when it's collapsed and then change margin-top of menu-links to 0px and when it's expanded I want to change it to 60px.</p>
  
  <p>Here's a bootply sample:</p>
  
  <p><a href="http://www.bootply.com/120802" rel="noreferrer">http://www.bootply.com/120802</a></p>