Searching for Window Onbeforeunload Support information? Find all needed info by using official links provided below.
https://developer.mozilla.org/en-US/docs/Web/API/WindowEventHandlers/onbeforeunload
The onbeforeunload property of the WindowEventHandlers mixin is the EventHandler for processing beforeunload events. These events fire when a window is about to unload its resources. At this point, the document is still visible and the event is still cancelable.
https://stackoverflow.com/questions/158673/onbeforeunload-support-detection
I wrote about a more-or-less reliable inference for detecting event support in modern browsers some time ago. You can see on a demo page that "beforeunload" is supported in at least Safari 4+, FF3.x+ and IE. Edit: This technique is now used in jQuery, Prototype.js, Modernizr, and likely other scripts and libraries.
https://www.w3schools.com/jsref/event_onbeforeunload.asp
The onbeforeunload event occurs when the document is about to be unloaded. This event allows you to display a message in a confirmation dialog box to inform the user whether he/she wants to stay or leave the current page. The default message that appears in …
https://developer.mozilla.org/en-US/docs/Web/API/Window/beforeunload_event
Attaching an event handler/listener to window or document's beforeunload event prevents browsers from using in-memory page navigation caches, like Firefox's Back-Forward cache or WebKit's Page Cache. The HTML specification states that calls to window.alert(), window.confirm(), and window.prompt() methods may be
https://support.mozilla.org/en-US/questions/993963
Problem statement is want to execute piece of code only on browser close , refreshing the browser tab , tab close . Previous version of firefox used to execute the code in window.onbeforeunload in all the 3 events mentioned above but now code in window.onbeforeunload is not executing on …
https://blog.revathskumar.com/2015/08/javascript-window-onbeforeunload.html
When you want to ask a confirmation from user about leaving a webpage by closing or refreshing window when their work is not saved, you can use window.onbeforeunload event for it.. unlike other events the use of confirm, alert and prompt will be ignored inside onbeforeunload event. We should return the message that we want show to the user.
https://bugzilla.mozilla.org/show_bug.cgi?id=245809
If you check the MSDN document about onbeforeunload, you will notice IE does not support window.attachEvent('onbeforeunload', fct). So maybe the real question is: should Mozilla support addEventListener("beforeunload", ...) at all? Since there is no way for an event listener to return a string it just doesn't make much sense.
https://developer.mozilla.org/en-US/docs/Web/API/WindowEventHandlers/onunload
These events fire when the window is unloading its content and resources. The resource removal is processed after the unload event occurs. ... WindowEventHandlers.onunload. ... Full support Compatibility unknown Compatibility unknown. In Firefox 1.5, using this event handler in your page prevents the browser from caching the page in the in ...
https://developer.mozilla.org/en-US/docs/Web/API/Window/unload_event
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https://support.frozenmountain.com/hc/en-us/community/posts/200239329-window-onbeforeunload
Feb 07, 2011 · using the onbeforeunload. window.onbeforeunload = function { return 'sure you wanna leave daz page?'; }; now it seems that everytime i use this call websync connection is lost. Seems like the websync connection simply disappears, no events are triggered what so ever. It does not call the window.onunload after i cancel the onbeforeunload question.
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