Check whether a window is Popup or not?

Question

This question is not the duplicate of if window is popup , But a similar one.

I am developing a extension which injects scripts to all web pages. I need to detect w

Answer 1

The following statement will be true if window is a popup window or subframe:

 window.parent != window

Answer 2

The following worked for me when testing in Chrome, Firefox, Safari, and IE8. It worked for a window created useing window.open() or target=_blank.

if (window.opener) {
    alert('inside a pop-up window or target=_blank window');
} else if (window.top !== window.self) {
    alert('inside an iframe');
} else {
    alert('this is a top level window');
}

Answer 3

For me, i was implementing a Logout screen that could be shown in a window popup via window.open(..) or from a link within a single page.

I needed to determine:

1) if my Logout screen is within a popup, then:

event.preventDefault();
window.close();

2) otherwise use the browser back function..

window.history.back();

My solution: If the page is within a popup, in my case it has a window page history of 1:

event.preventDefault();
if (window.history.length === 1) {
    window.close();
} else {
    window.history.back();
}

Answer 4

I use this code to determine a popup window

(window.opener && window.opener !== window && !window.menubar.visible)