title: Opposite of 'onFocus' in React
body: <p>I have a scenario  where there has to be a event triggered when the input selected goes out of Focus.</p>
  
  <p>There is already a onFocus event trigger when input is focused </p>
  
  <pre><code>&lt;input onFocus={this.callFunction}/&gt;
  </code></pre>
  
  <p>I need to know if there is an event that can be triggered when the selected input goes out of Focus. I could not find in React forms site </p>
  
  <pre><code>&lt;input outOfFocus={this.callFunction}/&gt;
  </code></pre>
  
  <p>Any Suggestion on this will be highly appreciated.</p>