title: Check if input has onchange listener and call it manually
body: <p>Let's say i have attached an event to an input, like this :</p>
  
  <pre><code>$('#input-address').on('change',function() {
  // do something
  });
  </code></pre>
  
  <p>Later in my code, i need to check if the 'input-address' has a change listener and call it manually. Something like this :</p>
  
  <pre><code>if ($('#input-address').hasOnChangeEvent) $('#input-address').callOnChangeEvent();
  </code></pre>
  
  <p>I know i can do some workaround to achieve this, would be easier for only one time task. But what i'm trying to achieve is a way to do it generically and apply for multiple inputs. Is this possible ?</p>
  
  <p>Thanks in advance !</p>