I'm trying to call
from within an iframe and I'm getting this error:
Uncaught DOMException: Failed to execute 'postMessage' on 'Window': An object could not be cloned.
It turns out the object I passed had methods, which is why the error message said
An object could not be cloned.
In order to fix this, you can do the following:
obj = JSON.parse(JSON.stringify(obj)); parent.postMessage(obj, 'whatever');