window.addEventListener NOT WORKING

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1

I am trying to set up this simple javascript function to trigger when someone books on a 3rd pary integration.

Should be really easy.

  1. add “window.addEventListener(“message”, receiveMessage);”
    2)add the Function

function receiveMessage(e) {
if (typeof e.data !== ‘string’) return;
if (e.data.search(‘cliniko-bookings-page:confirmed’) > -1) {
var dataLayer = window.dataLayer || (window.dataLayer = []);
dataLayer.push({
‘event’: ‘clinikoBookingCompleted’
});
}
}

But I can not get the bloody following to work. ITS SIME JS:

  • window.
  • .addEventListener

Any advice?

I am using Cliniko iframe for my booking and I need this method so that Google Tags Manager triggers.

If I could add a paid answer option I would.