How can I know when a popup window opens?

Question

I have a script that opens a popup in the same host. The popup is opened with window.open(url,name,settings) without assigning it to a variable.

I can't change the function that opens the popup and neither the code of the popup. But I can add extra Javascript code in the opener's load/ready event.

What I need is to know, from the opener, when the popup is open.
I know the name of the window, so if it's already open I can check it with:

var openedWin = window.open('', 'Selection');

But the problem is that when the window is not open, it tries to create a new window.

How can I implement a listener or something that let me check when a named popup window is opened?

Thank you!

Answer 1

I can only think of one way to do this, and it's ugly : Monkeypatch window.open in the opener's load/ready event you said you have access to:

var original = window.open;
window.open = function(url, windowName, windowFeatures) {
    // Chain to the original
    var wnd = original.call(window, url, windowName, windowFeatures);

    if (windowName === "Selection") {
        // Do whatever it is you want to do with `wnd`
    }

    return wnd;
};

If there's any other solution, use it; but if there isn't (and I don't think there is), this should work.