跨域postmessage（）通过ie8中的弹出窗口

Question

Is there a way to use postmessage() crossdomain via popup in ie8. I wish to run one function on the parent page after the user performs a action(login) in the popup. How do sites like facebook do it.

Answer 1

Cross-domain PostMessage in IE8 is limited to frame/iframe relationships , it is not allowed to cross tabs or windows.

You can mimic its behaviour by using a switchboard server via websockets, with fallback to longpolling for older browsers via for example Socket.io . You would then broadcast a message via the switchboard that the other tab or windows can subscribe to to know when login has succeeded/failed.