How to Detect if a JavaScript Window Open Is Closed?
Learn how to detect if a window opened via JavaScript is closed by monitoring the window.closed property with setInterval.
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To detect if a window open is closed, monitor the `closed` property of the window object you've opened. This is done by first creating a variable to hold the new window reference, for example, `var myWindow = window.open(URL, name, specs);` Then, periodically check the `myWindow.closed` property using a function with `setInterval()`. If `myWindow.closed` is `true`, the window has been closed. This technique allows you to perform actions based on the window's open or closed status.
FAQs & Answers
- What does the window.closed property indicate in JavaScript? The window.closed property returns a boolean indicating whether the referenced window has been closed (true) or is still open (false).
- How can I check if a popup window is closed in JavaScript? You can store the window reference returned by window.open in a variable and periodically check the variable's closed property using setInterval to detect when the window closes.
- Why use setInterval to monitor window.closed status? Using setInterval allows your script to continuously check the window.closed property at regular intervals so you can respond immediately when the window closes.
- Can I perform actions after detecting a window is closed? Yes, once your script detects the window is closed, you can execute functions such as cleaning up resources, updating UI elements, or triggering other processes.