Prevent user from closing without saving

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Wisej v 3.17 .NetFramework app
I want to detect whenever a user closes the browser or a tab.
if they are editing a record when they close the browser or tab, I need
to detect that and message them to confirm they want to abandon their editing.

I think this concept is called “Intention to close”???
That’s when you go to close and a website will show a popup with an offer
of some sort.. last minute sales pitch etc…

If they confirm, let them close, delete user from loggedin table and
add a record to the loginout table then close the app.
If not editing , just delete user from loggedin table and
add record to the loginout table and close app.

I have sparred with ChatGPT, CoPilot and GitHub AI’s but all kept feeding
me Net Core code. It looks like this is doable but I’m missing something.

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Another resource you should consider using is the AI search feature on our website: https://wisej.com/blog/your-wisej-net-questions-answered-powered-by-ai/

For example, if I search “How to prevent the user from closing the browser” I get this result:

You cannot fully prevent a user from closing their browser or tab, but you can warn them before they leave the page using the browser’s built-in “beforeunload” event.

To show a warning when a user tries to close the tab or browser:

window.addEventListener('beforeunload', function (e) {
  e.preventDefault();
  e.returnValue = '';
});
  • This triggers a confirmation dialog when the user tries to close the tab, refresh, or navigate away.
  •  Modern browsers do not allow you to customize the dialog text for security reasons.
  •  Users can still choose to leave, so this only acts as a warning, not a true prevention.

There is no way to completely block a user from closing their browser or tab, as this would be a security and usability risk. Use the “beforeunload” event to warn users, but always design your application to handle unexpected exits gracefully.

Here you should use the Application.EnableUnloadConfirmation, see documentation here:  https://docs.wisej.com/api/v3.5/wisej.web/general/application#enableunloadconfirmation Simply set Application.EnableUnloadConfirmation = true;

See also this forum thread: https://wisej.com/support/question/how-can-i-implement-a-notification-or-warning-message-in-wisej-when-a-user-attempts-to-close-the-browser-or-tab

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