JavaScript: The Definitive Guide

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JavaScript Reference

Window.closed Property


Window.closed Property---specifies whether a window has been closed


Navigator 3.0




The closed property of the Window object is a read-only Boolean value that specifies whether the window has been closed. When a browser window closes, the Window object that represents it does not simply disappear. The Window object continues to exist, but its closed property is set to true.


Once a window has been closed, you should not attempt to use or manipulate it in any way. If your code needs to use a window that may be closed without your program's knowledge, then you should be sure to always test the closed property before using the Window object.

See Also

"Window", "Window.close()"

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