@SanfordWhiteman or anyone who may be listening, because I may be talking to myself here. (But journaling this may be useful to someone in the future.)
I think my problem is tracking across domains, since the cookie on Marketo-hosted page (let's call this page A - where the user is identified via their pURL) and the destination page (let's call this page B - an externally-hosted page with Munchkin code) are different domains. This means that I need to associate the two cookies for Munchkin magic to happen. From what I can find, I can do this by adding the page A cookie value for _mkto_trk with a URL parameter named _mkt_trk as a query string on the URL for page B.
I've added a few steroids to my redirect script to accomplish this. (Don't laugh at my hacking!)
Here's the revised Javascript...
<script type="text/javascript">
// <![CDATA[
// JavaScript - to run when the page has loaded...
//This version will change URL based on {{my.Long-URL}} and {{my.LongURL-UTM}} token values.
function getCookie(name) {
// Split cookie string and get all individual name=value pairs in an array
var cookieArr = document.cookie.split(";");
// Loop through the array elements
for(var i = 0; i < cookieArr.length; i++) {
var cookiePair = cookieArr[i].split("=");
/* Removing whitespace at the beginning of the cookie name
and compare it with the given string */
if(name == cookiePair[0].trim()) {
// Decode the cookie value and return
return cookiePair[1];
}
}
// Return null if not found
return null;
}
window.onload = function pURLredirect() {
// Wait for cookie value to be set
var mktoTrk = getCookie("_mkto_trk");
var i = 0;
while(mktoTrk != "" && i < 100) {
var mktoTrk = getCookie("_mkto_trk");
i++;
}
//Use _mkto_trk value for _mkt_trk (yes, it is different), but after 100 checks it may be null
var destinationURL = "{{my.Long-URL}}" + "?" + "{{my.LongURL-UTM}}" + "&_mkt_trk=" + mktoTrk;
window.location.replace(destinationURL); //redirect user to Final Page
return null;
}
// ]]></script>
In summary, the getCookie() function will return the cookie value for the name passed to it. In this case the name is _mkto_trk. In the pURLredirect() function that runs onLoad, I get the value and store it in a variable named mktoTrk, then I have added a little while loop to give the cookie time to load in case it is initially null. When it is not null it moves on, but if it is still null after 100 checks I move on so we don't keep the user waiting. I haven't used decodeURIComponent() or encodeURIComponent() for the value, because I am assuming that the value is already encoded URI in the cookie. I then execute the redirect. This does work and I get to the destination page (B) with the query string appended.
In this case I get...
&_mkt_trk=id:AAA-BBB-CCC&token:_mch-marketo.com-1585149994161-15329
However. 🥁 (drum roll) ... no Munchkin magic happens on page B.
Am I barking up the wrong tree? 🌳🐕
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