Is there a way to test whether a handler is already set?

[ricklang]

For example, how I test whether the following handler was already set? Looks like I can catch the exception. Just want to know whether there is a more elegant way.

postRobot.on('getUser', function(event) {
....
});

[svenyonson]

That would be useful for me as well, as I am getting an error that a handler has already been set when I try to open a child window multiple times in a session. Is there a way to cancel all listeners without storing each listener in a var at the time it is created? Something like postRobot.cancelAll()?

[Cijin]

Is this issue taken up already? Could I give it a try please?

[mnicpt]

@Cijin This has already been taken up and PR created. Thank you for your interest.

[Cijin]

@mnicpt No worries at all. I got assigned another issue. 😄