Google Analytics Event Tracking onClick Code -

i'm trying set event tracking on web site can't working correctly.

my tracking code:

<script>   (function(i,s,o,g,r,a,m){i['googleanalyticsobject']=r;i[r]=i[r]||function(){   (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new date();a=s.createelement(o),   m=s.getelementsbytagname(o)[0];a.async=1;a.src=g;m.parentnode.insertbefore(a,m)   })(window,document,'script','//www.google-analytics.com/analytics.js','ga');    ga('create', 'ua-420xxxxxxx', 'mywebsite.org');   ga('send', 'pageview');  </script> 

my event tracking code:

<a href="#purchasepanellink" class="uk-button uk-button-primary" onclick="$('#purchasepanel').show(); _gaq.push(['_trackevent', 'button', 'click', 'purchase details',, false]);">purchase details</a> 

you mixing classic code universal code. not work. need replace this:

_gaq.push(['_trackevent', 'button', 'click', 'purchase details',, false]); 

with this:

ga('send', 'event', 'button', 'click', 'purchase details'); 

gajs reference events: https://developers.google.com/analytics/devguides/collection/upgrade/reference/gajs-analyticsjs#events