Is it possible for parent window to notice if child window has been closed?

I have parent window (opener) and child (popup)

----------                      --------------
|         |                     |            |
| parent  | -----> opens popup  |  child     |
|         |                     |            |
-----------                     --------------

Let's say, in parent page, I have js function hello()

In order for child to call parent's hello() when the child window is closed and also pass an argument, I can do,

window.close();
window.opener.hello(someArgument);

This will close the window and also call parent's hello();

But what if I don't want to have the code window.opener.hello() in child page? I mean I want the code to be in parent page only

One thing I can think of is:

Somewhat parent knows when the child is closed (event listenr??? not sure in js) But in such case how开发者_如何学Go to receive the argument? (i.e. some data back from the child)

The obvious solution (adding an onunload event handler property to the pop-up window object) won't work in IE. However, using attachEvent does work in IE, so the following will do the job:

var win = window.open("popup.html");

function doStuffOnUnload() {
    alert("Unloaded!");
}

if (typeof win.attachEvent != "undefined") {
    win.attachEvent("onunload", doStuffOnUnload);
} else if (typeof win.addEventListener != "undefined") {
    win.addEventListener("unload", doStuffOnUnload, false);
}

If you want the pop-up window to pass information to the main window, I'd suggest placing a property in the pop-up's window object (e.g. window.someValue = 5;). In doStuffOnUnload(), you can then pick up on that property: alert(win.someValue);

you could attach an onunload event to the child window from the parent