How to handle closing of a previously opened window

I have a form where the user fills out stuff. Towards the end they click on a link which opens up a new window to record a video. Once they are done recording they close the window.

How can I react to the closing of the window on the first window form? I may want 开发者_如何转开发to submit the form automatically or have an ajax request started to display info etc... If this isn't possible what do you suggest?

Edit:

Parent window:

function someAlert() {
 alert("success");  
}

Child window:

window.onunload =window.opener.someAlert();

If you opened it with window.open, you can call

window.opener.someJavaScriptFunctionInParent();

call it with window.onunload or right before window.close()