JavaScript closes the page

JavaScript is a widely used programming language often used for website development and browser-side scripting. In addition to adding beautiful animations and interactive effects to the website, JavaScript can also help us implement more useful functions, such as performing certain actions when the page is closed.

In this article, we will explore some ways to use JavaScript to close a web page and perform specific actions when it is closed. We will also introduce the different methods that can be used for this purpose and discuss the advantages and disadvantages of each method.

Method 1: Use window.close

To accomplish this task, we can use the window.close function in JavaScript. This function closes the current browser window, but in some browsers you need to open the window first before you can close it.

For example, in the code below, we create a new window and later call the window.close function in that window to display a message before closing.

let myWindow = window.open("", "myWindow", "width=200,height=100");
myWindow.document.write("
This is my window!
");
myWindow.close();

In the above example, we first create a new window using the window.open function and name it "myWindow". We then write a message to the window and subsequently close the window.

The main advantage of this method is that it is very simple and easy to understand, and is suitable for simple scenarios where the web page needs to be closed. However, it does not display the message before closing the window, because when the window is closed, the page is immediately closed without a chance to display the message.

Method 2: Use window.addEventListener

Another way to close a web page and perform some operations while closing is to use the window.addEventListener function. This function allows us to execute some custom code before the window is closed.

To use the window.addEventListener function, we can use the following code:

window.addEventListener("beforeunload", function(event) {
  event.preventDefault();
  console.log("Are you sure you want to leave?");
  return event.returnValue = '';
});

In the above code, we add an event listener to the window that closes it when the browser run before. This event listener takes a function as a parameter and executes any custom code we need within that function. In the above example, the function prints some text message and prevents the window from closing.

The advantage of using the window.addEventListener method is that it can execute arbitrary custom code before closing the window, such as storing any data for opening files or performing save operations. It can also be used in conjunction with other event listeners, such as events that are about to occur when the page is loaded.

Method 3: Use the Confirm dialog box

The Confirm dialog box is a very common JavaScript component used to ask the user if they are willing to perform certain operations. Using the Confirm dialog box allows us to prompt the user whether they really want to leave when closing the web page.

You can use the following code to display a confirmation message when closing the web page:

window.onbeforeunload = function() {
  return "Are you sure you want to leave?";
}

In this example, we add an onbeforeunload event listener that contains a confirmation message that is returned. When a user tries to close a web page, the browser displays a Confirm dialog box to let the user determine whether they want to continue.

The advantage of using the above method is that it can create a dialog box before closing the window, thus increasing the user experience. However, some users may not understand this Confirm dialog box, which may lead them to close it on purpose, thereby accidentally closing the entire website window.

Conclusion

In summary, we have several ways to close the page using JavaScript and perform actions on closing. Each method has its advantages and disadvantages, depending on the type of operation you want to perform and the user experience.

For simple scenarios that do not require other information to be displayed before closing the window, using the window.close method is a very straightforward method. For situations where you need to execute custom code before closing or in conjunction with other events, window.addEventListener is a better choice. Finally, the Confirm dialog is a very practical option when you want to increase the user experience and let the user determine whether they want to leave.

No matter which technique you decide to use to close a web page, JavaScript is a very useful tool that can help us do this easily.

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