title: How to get bootstrap select picker click event
body: <p>I am using bootstrap select picker in which I want the event on click of
  dropdown, because after that, I want to append some dynamic option through
  ajax so I want to show alert when user will click the dropdown. I have
  tried below code but it is not working.</p>
  
  <p>Html</p>
  
  <pre><code>&lt;select id="new2"&gt;                                                              
     &lt;option&gt;Select Vendor&lt;/option&gt;                                                         
  &lt;/select&gt;
  </code></pre>
  
  <p>Script code</p>
  
  <pre><code>$("select").on("click", function() {
    alert("hello");
  });
  </code></pre>