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window.closed Property Javascript DOM

The closed property will return a Boolean value of true if the target window has been closed, and false it is open.

SYNTAX window.closed

To demonstrate how it works we will create a page that has a popup generator that will keep generating the popup window on a timed interval if the user happens to close it. This script is geared to check to see if a window has been closed before trying to reopen it by using the "closed" property to perform an evaluation before we execute some code.

var URLString = "anyPage.html";
var popup =;
function rePop(){
    if (popup.closed){
        popup =;
    setTimeout("rePop()",7000); // 7000 ms is equal to 7 sec

If you are looking for a script that will do something when a user tries to close the main browser window instead, you can find that fully explained with an example here in video and script form:
Javascript Trap User for Unsaved Work Tutorial Textarea Check Before Leave

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CSS Level 3 Properties is a growing educational system packed with video and written material that you can access 24/7 100% free. The focus here in 2014 is spread between five technologies: HTML, CSS, JavaScript, PHP and MySQL. Learn programming theory, database interaction, web design, animation, graphics editing, vector art, 3D modeling, and much more. The educational experience here is a hybrid one offering both high quality video tutorials and code libraries that grow more robust every day. The code libraries are being assembled so that developers can discover all of the building blocks of their favorite languages. The libraries coupled with high quality video tutorials will take you deep down the rabbit hole very quickly. You can also ask questions and get free advice at