title: What is data-toggle="modal" used for?
body: <p>I have a button code which someone created it. Here are the button code:</p>
  
  <pre><code>&lt;button class="demo btn btn-primary" data-toggle="modal" href="#long"  onClick="javascript:add();"&gt;&lt;i class="icon-plus-sign icon-white"&gt;&lt;/i&gt; Add Employee&lt;/button&gt;
  </code></pre>
  
  <p>I've edit the function related to the button (send the new data from the button, and call it in the function), but nothing happened. Then I tried to delete <code>data-toggle="modal"</code>, the pop up didn't show. So, I wonder, what is <code>data-toggle="modal"</code> use for?</p>
  
  <p>I thought here are the link to modal:</p>
  
  <pre><code>&lt;script src="js/bootstrap-modalmanager.js"&gt;&lt;/script&gt;
  &lt;script src="js/bootstrap-modal.js"&gt;&lt;/script&gt;
  </code></pre>
  
  <p>Can anyone explain me about <code>data-toggle="modal"</code>? Thank you.</p>