Function addOnEvent

Register a callback for event handling.

Usage:

const statusUpdate = function statusUpdate(data) {
    // ...
}
faces.ajax.addOnEvent(statusUpdate);

Implementation Requirements:

This function must accept a reference to an existing JavaScript function. The JavaScript function reference must be added to a list of callbacks, making it possible to register more than one callback by invoking faces.ajax.addOnEvent more than once. This function must throw an error if the callback argument is not a function.