title: how to show hidden button if more than 1 checkbox selected
body: <p>I have 2 buttons add and group. Initially group button is hidden. Add button is used for creating records. </p>
  
  <p>So for example:
  When 5 records are created(pressing 5 times add button). Now if user selects more than
  <code>checkbox</code>, then the hidden group button should appear. Can any body please tell me how to do this?</p>
  
  <p>Please see this <a href="http://jsfiddle.net/javalover_stackoverflow/4GP9c/176/" rel="nofollow">fiddle</a></p>
  
  <p>I am using <code>bootstrap css</code> and for hiding I do as</p>
  
  <pre><code>&lt;input type="button" id="btn2" class="btn btn-lg btn-primary hide" value="Group"&gt;
  </code></pre>
  
  <p><strong>UPDATE</strong>
  Check boxes will only appear if user enters some records. Filling the form and after pressing the add button</p>