Customized Chrome prompt box's warning word and listened the confirm & cancel btn

Question

window.addEventListener("beforeunload", function (e) {
    window.event.returnValue = "真的要刷新页面么？";
    return '2222';
});

How to self-customized the prompt box warning words when closing or updating an unsaved page in Chrome , and listen the confirm or cancal button click event ?

i mean how to self-customized the prompt box warning words when closing or updating an unsaved page in Chrome , and listen the confirm or cancal button click event ? — w312011343, Sep 28 '17 at 08:51
Possible duplicate of [How to customize the message "Changes you made may not be saved." for window.onbeforeunload?](https://stackoverflow.com/questions/40570164/how-to-customize-the-message-changes-you-made-may-not-be-saved-for-window-onb) — Josh Lee, Sep 28 '17 at 14:53

score 0 · Answer 1 · answered Sep 28 '17 at 14:53

The beforeunload dialog bog isn't customizable. Any value other than the empty string indicates a request to confirm unloading the document, but the value itself isn't used for anything.

You can use e.preventDefault() instead if you like.

Reference: § 7.8.11.1 The BeforeUnloadEvent interface

This changed in Chrome 51, Firefox 44, and Safari 9.1 (see 2).

Customized Chrome prompt box's warning word and listened the confirm & cancel btn

1 Answers1