Availability of registered JS callbacks

[winapiwrapper]

Hello everyone,

I need to register a few JS callbacks using C++.

Are they guaranteed to be available before my page is fully loaded?
I'm currently calling a callback on the Javascript window.onload event, and of course it works, but I'd like to call it before (as soon as my script is loaded). Can I do that safely?

[magreenblatt]

If you register the callbacks in OnContextCreated they will be available before any JS is executed in the frame.

[winapiwrapper]

Yes, I do register them in OnContextCreated.

Thank you very much!