Handling beforeunload with Partials enabled makes no effect

[palpfiction]

Hello! First of all I want to send a huge "thank you" to everyone collaborating in this project.

While trying to handle the beforeunload event in an island (to show a confirmation dialog before the user leaves the page) I noticed that it didn't do anything. I finally noticed that it stopped working when enabling Partials in my app, so it seems that's the issue.

Is this something expected when working with Partials? Is there a workaround that I can use to have Partials enabled + handling the beforeunload event?

Thank you very much!!

How to reproduce

I created a example repository with the minimal Fresh app handling the event to show a confirm dialog:

https://github.com/palpfiction/fresh-beforeunload-with-partials

The main branch doesn't use Partials and shows it working correctly when navigating. In the branch using-partials you can see that the confirm dialog doesn't show up anymore when navigating to the other page.

[marvinhagemeister]

The browser only dispatches when "leaving" the page and a new full page load is happening. This is not the case with client-side routing as there is no full page load. We could dispatch an event when a new partial is requested, but there would still be some user code required to detect whether the partial is for the whole page or just a random small area on it. Fresh has no information what the partial in question represents.

[palpfiction]

That makes sense, thank you very much! Is sending events when requesting or loading partials something already planned or tracked in another issue?