Searching for Js Onunload Support information? Find all needed info by using official links provided below.
https://www.w3schools.com/jsref/event_onunload.asp
The onunload event occurs once a page has unloaded (or the browser window has been closed). onunload occurs when the user navigates away from the page (by clicking on a link, submitting a form, closing the browser window, etc.). Note: The onunload event is also triggered when a user reloads the page (and the onload event).
https://developer.mozilla.org/en-US/docs/Web/API/WindowEventHandlers/onunload
The onunload property of the WindowEventHandlers mixin is the EventHandler for processing unload events. These events fire when the window is unloading its content and resources. The resource removal is processed after the unload event occurs.
https://developer.mozilla.org/en-US/docs/Web/API/Window/unload_event
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https://stackoverflow.com/questions/7527969/detecting-browsers-that-dont-support-onunload-onbeforeunload
Of all the browsers, it seems that only Opera doesn't support onunload/onbeforeunload events. (It's been fifteen years now, Opera!) Solutions for this issue have been covered many times, here for example: onbeforeunload support detection Unfortunately, as of Opera 11.51, ("onbeforeunload" in window) == true, but the actual onbeforeunload event is never executed!
https://www.w3schools.com/tags/ev_onunload.asp
The onunload attribute fires once a page has unloaded (or the browser window has been closed). onunload occurs when the user navigates away from the page (by clicking on a link, submitting a form, closing the browser window, etc.) Note: If you reload a page, you will also trigger the onunload event (and the onload event).
https://www.sitepoint.com/community/t/onunload-not-working-for-me/28877
Aug 30, 2014 · onUnload not working for me? JavaScript. Fergal. August 30, ... due primarily to support for onunload events varying between browsers. ... use JS's setInterval function:
https://support.mozilla.org/en-US/questions/993972
So i kept return statement in the window.onbeforeunload and all the code in the window.onunload . Now on click on the Leave this page it should call window.onunload and execute the code but in firefox it is not working like this. can you please provide me work around or solution for this. Thanks alot.
http://help.dottoro.com/ljflhicd.php
Occurs before the browser unloads the document. The onunload event is not cancelable, because of security reasons. To display a comfirmation dialog box, where the user can confirm whether he wants to stay or leave the current page, use the onbeforeunload event.
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