Dec 31, 2013 · What I tried is window.onbeforeunload = function (e) { var message = "Your confirmation message goes here.", e = e || window.event; // For IE and Firefox if (e) { e.returnValue = message; } // For Safari return message; }; By "close," do you mean exiting the browser application completely or simply closing a tab or window?

Oct 8, 2010 · Well, AFAIK the only way in JavaScript to detect that is to use either onunload or onbeforeunload events. Unfortunately (or fortunately?), those events are also fired when you leave a site over a link or your browsers back button. So this is the best answer I can give, I don't think you can natively detect a pure close in JavaScript.

Dec 23, 2010 · Last updated on October 30th, 2024 at 02:24 pm. This script will help you to detect browser or tab close event and alert some messages. Even this script will be useful to call some Ajax functions which terminate connection to Database or something related. Tested on latest version of Chrome and Internet Explorer 11.0 and Microsoft Edge.

May 26, 2015 · How to capture the browser window close event? Problem : I just want to detect the browser close event and do some handling on that without showing the prompt to the user. I have tried many methods to detect browser close event through jQuery or JavaScript. But unfortunately I could not succeed.

Jan 9, 2025 · Detecting browser or tab closure in JavaScript is essential for preventing data loss or unintended navigation. Using the beforeunload event, developers can prompt users with a confirmation dialog, ensuring they don’t accidentally leave a page with unsaved changes or important information.

Dec 27, 2023 · Fortunately in JavaScript, we can actually detect when a user tries to close or navigate away from our app. By listening for browser and tab closing events, we can save users from data loss and frustration. In this post, we‘ll master these critical webpage lifecycle events through numerous examples.

Aug 22, 2024 · To detect when a user is about to close the browser or navigate away, use the beforeunload event: Detecting a browser close event is useful for scenarios such as saving user data, ending sessions, or asking users to confirm that they want to leave a page.

Mar 11, 2025 · One of the most common ways to detect when a user is about to close a tab or window is by utilizing the beforeunload event. This event is triggered when the user attempts to leave the page, providing an opportunity to prompt them with a message or perform some cleanup tasks. Here’s a simple example of how to implement this: event.preventDefault();

Jan 20, 2014 · I want an event that is triggered only when a browser window or tab is closed. The code must work in all browsers. I am using Following code in Masterpage. var leaving = true; var isClose = false; function EndChatSession() { var request = GetRequest(); request.open("GET", "../Chat.aspx", true); request.send(); document.onkeydown = checkKeycode.

Jul 24, 2022 · In JavaScript, you can use the beforeunload event to detect a tab or window closing in a browser. It is used to alert the user about unsaved changes on the webpage or to prevent the user from mistakenly closing the window or the browser. Here is an example that you can use to display an alert message when the user tries to close a tab or window: