Two onclick events on one button -- Google Analytics Event Tracking

outBoundLink.js

/* Track outbound links -- https://support.google.com/analytics/answer/1136920?hl=en */

/* Add second onclick event after original and return false for both */
<input type="submit" onclick="(function(x){return x;})(this); trackOutboundLink('http://website.com'); return false;">

<script>
  (function(b,o,i,l,e,r){b.GoogleAnalyticsObject=l;b[l]||(b[l]=
  function(){(b[l].q=b[l].q||[]).push(arguments)});b[l].l=+new Date;
  e=o.createElement(i);r=o.getElementsByTagName(i)[0];
  e.src='https://www.google-analytics.com/analytics.js';
  r.parentNode.insertBefore(e,r)}(window,document,'script','ga'));
  
  ga('create','UA-XXXXXX-X','auto');
  ga('send','pageview');
</script>

/* Place this script below your GA code as I do here */
<script>
  /**
  * Function that tracks a click on an outbound link in Google Analytics.
  * This function takes a valid URL string as an argument, and uses that URL string
  * as the event label. Setting the transport method to 'beacon' lets the hit be sent
  * using 'navigator.sendBeacon' in browser that support it.
  */
  var trackOutboundLink = function(url) {
     ga('send', 'event', 'outbound', 'click', url, {
       'transport': 'beacon',
       'hitCallback': function(){document.location = url;}
     });
  }
</script>