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Gtag.js

Tracking Script: Replace UA ID with clients Analytics account ID – Placed inside <head>

<!-- Global site tag (gtag.js) - Google Analytics -->
<script async src="https://www.googletagmanager.com/gtag/js?id=UA-XXXXX-Y"></script>
<script>
  window.dataLayer = window.dataLayer || [];
  function gtag(){dataLayer.push(arguments);}
  gtag('js', new Date());
  gtag('config','UA-XXXXX-Y');
</script>

Event Tracking: Further Documentation

gtag('event', 'action', {
    'event_category': 'category'
});

Example Event:

<script>
    jQuery('a[href*="tel:"]').on('click',  function(){
        gtag('event', 'click', {
            'event_category': 'phone-number'
        });
    });
</script>

Routing Example Event:
It is also possible to specify the UA ID you wish to send the event to, using the send_to argument
(For use when the site is using multiple Gtag.js Instances)

<script>
    jQuery('a[href*="tel:"]').on('click',  function(){
        gtag('event', 'click', {
            'send_to': 'UA-xxxxxxxx-x',
            'event_category': 'phone-number'
        });
    });
</script>