title: How to focus on a newly created input element in Meteor
body: <p>Consider this requirement.</p>
  
  <p>In template, there is</p>
  
  <ul>
  <li>a button to insert a blank record into Meteor Collection</li>
  <li>a list of input element represented the collection which can edit value of the record</li>
  </ul>
  
  <p>When I pressed the button, the input element with blank record will be displayed into html because of Meteor's reactivity. 
  But how to set the input to be auto-focused when created?</p>
  
  <p>I know maybe setting an ID into <code>session</code> and judging it in <code>rendered</code> function will be a solution. Is there any easier way to implement that?</p>