How to get the "Leave site? Changes that you made may not be saved" when trying to close a window with a populated form

Question

I have a form that when filled in, I can exit the window without being given a warning (I'm using Chrome).

How can I ensure I get a warning before exiting? Is there a Django setting for this?

Answer 1

您需要提供一个函数，返回一个字符串到onbeforeunload窗口或文档正文，以触发“离开站点”弹出窗口。

 window.onbeforeunload = () => '';

 <a href="http://example.com">Click to trigger</a>

Answer 2

该事件称为beforeunload，因此您可以为window.onbeforeunload分配一个函数