How Can I Reliably Detect Only Browser Window Close Events in JavaScript?

Browser Window Close Event: A Comprehensive Guide

jQuery offers the "beforeunload" event to capture the moment when a user attempts to leave a webpage. However, this event triggers not only for window closures, but also for actions such as form submissions. To address this issue, let's delve into the details of capturing the browser window close event specifically.

The "beforeunload" event, as its name suggests, fires whenever the user navigates away from the current page. This includes form submissions, link clicks, closing the window or tab, and navigating to a new page using various means.

To illustrate, consider the following jQuery code:

jQuery(window).bind(
    "beforeunload",
    function() {
        return confirm("Do you really want to close?")
    }
)

While this code snippet attempts to capture the window close event, it inadvertently triggers the confirmation dialog for other actions as well, such as form submissions. To address this limitation, we need to differentiate between window closures and other navigation events.

One approach involves excluding form submissions and hyperlinks (excluding those from other frames) by utilizing the following jQuery code:

var inFormOrLink;
$('a').on('click', function() { inFormOrLink = true; });
$('form').on('submit', function() { inFormOrLink = true; });

$(window).on("beforeunload", function() {
    return inFormOrLink ? "Do you really want to close?" : null;
})

In this code, we track if the user is currently interacting with a form or link by setting the inFormOrLink variable to true on relevant actions. During the "beforeunload" event, we display the confirmation prompt only if the user is not currently in a form or link.

Note that this approach may encounter issues if another event handler cancels the submit or navigation, potentially preventing the confirmation prompt from displaying even if the window is closed. To mitigate this issue, consider recording the time of submit and click events and verifying if the "beforeunload" event occurs more than a few seconds later.

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