Window closed property

JavaScript Window Object

closedA read-only property indicating whether the referenced window is closed.

If the window is closed, this property returnstrue;If the window is already open, it returnsfalse.

Syntax:

window.closed

var x = document.getElementById("output");
function checkWindow() {
　　if (!popupWindow) {
　x.innerHTML = "' popupWindow' Never opened!";
　　} else {
　if (popupWindow.closed) {　
x.innerHTML = "' popupWindow' Already closed!";
　} else {
x.innerHTML = "' popupWindow' Not closed!";
　}
　　}
}

Browser Compatibility

All browsers fully support the close property:

Technical Details

Related References

Window (Window) Reference:window.opener property

Window (Window) Reference:window.open() method

Window (Window) Reference:window.close() method

JavaScript Window Object