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How to delete _mkto_trk on Marketo 2.0 form submit

Question asked by Opine Consulting (IL) on Jun 30, 2016
Latest reply on Jun 30, 2016 by Sanford Whiteman

We are in the process of implementing EU cookie privacy directive on the main website and also Marketo landing pages. I've seen some references to Marketo automatically creating the _mkto_trk cookie on form submit if it isn't already there. Can anyone verify if this is true? Just trying to figure out the best way to deal with this situation:


- User indicates no tracking 

- munchkin.init is not run and _mkto_trk is not set.

- On page load, if _mkto_trk is set, it is deleted

- Marketo Form 2.0 is submitted and goes to a follow-up page so even if the _mkto_trk is set, it is deleted on page load (per above)


Here's the part I'm really asking about:

If the Marketo Form 2.0 is shown in a modal or in a lightbox, after submission there is no page load generated. If the cookie is really automatically created, then it needs to be deleted. Would you delete _mkto_trk in an on success handler or is there a better way to manage this?


Any tidbits for implementation would be much appreciated!