How to Implement Page Unload Confirmation Using JavaScript?

JavaScript Confirmation before Page Unload

In web development, it's often necessary to confirm an action with the user before leaving a page. This is particularly important for pages with sensitive data or transactions. While the onunload event can be used for this purpose, it has a limitation that prevents it from redirecting the user.

Proper Implementation with onbeforeunload

The appropriate event for this task is the onbeforeunload event. It intercepts the user's request to leave the page and provides an opportunity to display a confirmation prompt. The following code snippet demonstrates its usage:

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

Enhanced Functionality with jQuery

jQuery provides a convenient way to handle the beforeunload event:

$(window).bind('beforeunload', function() {
  return 'Are you sure you want to leave this page?';
});

Limitations of onunload

While the onunload event can be used for tasks before unloading the page, it's important to note that it cannot redirect the user. Chrome and other modern browsers restrict its use for security reasons.

Example Implementation

Here's an example of how to use onunload to display an alert before the page is unloaded:

window.onunload = function() {
  alert('Thank you for visiting.');
};

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