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You are here: Reference > JavaScript > client-side > dialog > properties > closed (window)

closed property (window)

Browser support:

Returns a Boolean value that indicates whether the window is closed or not.

Syntax:

object.closed;

You can find the related objects in the Supported by objects section below.

This property is read-only.

Possible values:

Boolean, one of the following values:

false

The window is open.

true

The window is closed.

Default: this property has no default value.

Example HTML code 1:

This example illustrates the use of the closed property:

<head>
    <script type="text/javascript">
        var testWindow = null;
        function OpenTestWindow () {
            if (!testWindow || testWindow.closed) {
                testWindow = window.open ("", "testWindow", "width=250, height=150, left=10, top=10");
            }
        }

        function IsTestWindowClosed () {
            if (testWindow) {
                if (testWindow.closed) {
                    alert ("The test window is closed.");
                }
                else {
                    alert ("The test window is opened.");
                }
            }
            else {
                alert ("The test window was never opened.");
            }
        }
    </script>
</head>
<body>
    You can open a test window and test its closed state with the following buttons:
    <br />
    <button onclick="IsTestWindowClosed ();">Test the closed state</button>
    <br />
    <button onclick="OpenTestWindow ();">Open the test window</button>
</body>