Hi,

This isn't really related to Matomo. If you wan't to add an eventListener to an element you need to wait until it exists.

document.addEventListener("DOMContentLoaded", function(event) { 
  document.getElementById("aid").addEventListener('click', function () {
    _paq.push(['trackContentInteractionNode', this]);
  });
});

Then it doesn't matter where you add the code, it will only be loaded after the all elements exist.

That snipped also doesn't need to be at the same place as your piwik tracking code. You can add it to the bottom or add it to the rest of your website Javascript.

PS: For general questions that aren't specific bugs in Matomo, please ask on the forum: https://forum.matomo.org/

That was not my idea, i have stolen and customized it from the developer site.
Please visit at the bottom of this page:
https://developer.matomo.org/guides/content-tracking

formElement.addEventListener('submit', function () {
    _paq.push(['trackContentInteractionNode', this, 'submittedForm']);
});

Thanks for the hint to "DOMContentLoaded".

The code on the developer page is correct. How it needs to be integrated into the website and what exactly it should do, depends on the website where you want to use it.

You're the first one to mention that, on a page that nobody will read on who reads the developer pages.