: What are the possible causes of discrepancies in Google Analytics ecommerce tracking? We have setup Google Analytics Ecommerce Tracking through Google Tag Manager. Code: $tracking_script = " dataLayer.push({

@Berryessa370

Your script is running before the GTM's dataLayer object is ready as it's retrieved asynchronously. This means you need to wait the load event is fired/triggered.

Your server side php code is not good as is writing into the dataLayer and definitely is the root issue this code is not awaiting for the GTM's datalayer object. Instead of this just create a variable to be ready for js.

$tracking_script = "var myObject = {your object code}";


Before the push code you need to put somewhere the php code to create the var

<script type="text/javascript">
<?php echo $tracking_script; ?>
</script>


Then you can use the load event to properly inject the server side code into the GTM's dataLayer. You can use the next gist:
gist.github.com/web20opensource/6c67368a2fdb0e712550#file-load-event-attachevent-addeventlistener-cross-browser
Then just add your lines inside the callback function:

var callBack = function(){
var myObject = myObject || {};
dataLayer = dataLayer || [];
dataLayer.push(myObject);
};


Or use jQuery like

$( window ).load(function() {
// Run code
var myObject = myObject || {};
dataLayer = dataLayer || [];
dataLayer.push(myObject);
});

Vote Up Vote Down