title: Bootstrap Affix - any tutorial about data-offset-bottom?
body: <p>I have tried look for so many affix tutorial out there, but all of them talk about data-offset-top. Anybody here know about tutorial of data-offset-bottom?? <br/>
  i have tried writing some code here <br/>
  <a href="https://jsfiddle.net/okiewardoyo/3m8oeLp5/" rel="nofollow">https://jsfiddle.net/okiewardoyo/3m8oeLp5/</a>
  <br/>
  Form above jsfiddle, i try using data-offset-top, <br/></p>
  
  <pre><code>&lt;ul class="nav nav-pills nav-stacked" data-spy="affix" data-offset-top="100"&gt;
  </code></pre>
  
  <p>What i want is, when user scroll until footer apear, the yellow side bar become not fix and follow the footer. <br/>
  I think, we can use data-offset-bottom here. But how to do that?? thanks</p>