@gelerind,
Ideally, you would want to hardcode a utag.link or utag.view call directly in the a success of your AJAX responses. However, since the code is out of your reach then this is not a option for you.
One solution may be to use a jQuery onHandler Extension, select a certain element you want to trigger off of say a "mousedown" event of a "Next" button.
Another solution, would be to use a custom JS extension and attached an event listener to the ajaxComplete event. From there, you can check each request to see if it is the correct AJAX response you want to trigger your utag.link / utag.view event.
jQuery(document).on('ajaxComplete', function (a,b,c) {
// Check a, b and/or c
if (a.url === 'http://www.foo.com/?quickview=true') {
// Fire Tealium
utag.link({
event_type : "next step"
});
}
});
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