JavaScript Closed Property example

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<!DOCTYPE html>
<html>
	<head>
		<title>Demo</title>
	</head>
<body>
<h1>Closed Property examples.</h1>
<p>Click the below buttons to know the closed property testing result.</p>
<input type="button" value="Click to open" onclick="testOpen()"/><br />
<input type="button" value="Click to close" onclick="testClose()"/><br /><br />
<input type="button" value="Click to check" onclick="testCheck()"/><br />
<p id="myId"></p>

function testOpen() {
        newWindow = window.open("", "newWindow", "height=250, width=500");
    }

function testClose() {
        if (newWindow) {
            newWindow.close();
        }
    }

function testCheck() {
        if (!newWindow) {
            document.getElementById("myId").innerHTML = "Window is not yet opened!";
        } else {
            if (!newWindow.closed) {
                document.getElementById("myId").innerHTML = "Window is not closed.";
            } else {
                document.getElementById("myId").innerHTML = "Window is closed"
            }
        }
    }
</script>
</body>
</html>

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JavaScript > Closed Property

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Output