The type representing an event handler e.g. onclick, onkeydown, etc... These event handlers can be triggered, but take care, accessing any of the fields on the event object in the callback will cause an exception to be raised.

Converts a js_any into a handler. Throws an exception if the value isn't a javascript function.

Triggers the provided event handler.

Use the extra_fields parameter in order to put extra fields on the event. This will let you simulate event handlers that read the event object's properties.