Window: closed property

BaselineWidely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

TheWindow.closed read-only property indicates whetherthe referenced window is closed or not.

Value

A boolean value. Possible values:

true: The window has been closed.
false: The window is open.

The following example demonstrates how a popup window can change the URL of the windowthat opened it. Before attempting to change the URL, it checks that the current windowhas an opener using thewindow.opener property and that the opener isn'tclosed:

// Check that an opener exists and is not closedif (window.opener && !window.opener.closed) {  window.opener.location.href = "https://www.mozilla.org";}

Note that popups can only access the window that opened them.

Refreshing a previously opened popup

In this example the functionrefreshPopupWindow() calls thereload() method of the popup's location object to refresh its data. If thepopup hasn't been opened yet or the user has closed it a new window is opened.

let popupWindow = null;function refreshPopupWindow() {  if (popupWindow && !popupWindow.closed) {    // popupWindow is open, refresh it    popupWindow.location.reload(true);  } else {    // Open a new popup window    popupWindow = window.open("popup.html", "dataWindow");  }}