I’ve written before about conditionally loading Munchkin based on IP ranges (which isn't a native feature), and about adding custom Munchkin options on Marketo LPs (where Munchkin is injected automatically with special options).
As Community user GF points out, anti-cookie/anti-tracking legislation like GDPR requires a combo of these earlier approaches:
- the end user must consent before Munchkin runs on Marketo LPs
- you need to preserve the LP-specific special options if they do consent
- you may need to add custom options, most often domainLevel
To get this working, we need to hack around Munchkin's hard-coded load-and-run logic on Marketo LPs. Luckily, it's not horrendously complex, though it'll look obscure to people inexperienced with such shenanigans.☺
Here are the scripts to put as high up in your page as possible (in <head> ideally, but near the top of <body> is fine too, like you get with an HTML element on a Free-Form LP):
<script type="application/javascript"
src="//munchkin.marketo.net/munchkin-beta.js">
</script>
<script>
(function munchkinInitDeferred(customOptions){
var nativeMunchkinInit = Munchkin.init;
Munchkin.init = function cacheInitOptions(id, options){
if (customOptions) {
Object.keys(customOptions)
.forEach(function(key){
options[key] = customOptions[key];
});
}
Munchkin.init = nativeMunchkinInit.bind(Munchkin, id, options);
console.log("Munchkin: Cached options", options);
};
})( /* custom init options here if necessary */ );
</script>
Notice I'm not passing any args to the function in the basic usage example above, there's just a comment:
...( /* custom init options here if necessary */ )`
If you need custom Munchkin initialization options (most commonly domainLevel) then pass those in an object:
...( {domainLevel: 2, someOtherOption: true} )
What does it do?
The code works by caching the Munchkin config for later — including both Marketo's special options and your custom options — while stopping the page from immediately running Munchkin.init().
You can see the cached config in the browser console:
This gives you complete control. Once someone opts in to being tracked, then run Munchkin.init() manually (call it with no arguments, since all the arguments, including the 123-ABC-456 Munchkin ID, are already stored).
Enjoy staying legal!