Find all needed information about Onunload Browser Support. Below you can see links where you can find everything you want to know about Onunload Browser Support.
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://stackoverflow.com/questions/7527969/detecting-browsers-that-dont-support-onunload-onbeforeunload
For anyone stumbling across this post, this is a code snippet I use for detecting onbeforeunload support and if the browser doesn't support it I switch to onunload (note the use of jquery, obviously not required). In my case I use this code (and a little extra) to check if any AJAX requests are still active and stop the user navigating away.
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/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://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://html.com/attributes/body-onunload/
body event handlers act on the browser window, so the onUnload is commonly used to bring up JavaScript alert when the visitor exits a website. Some visitors may find this behavior unhelpful, so it's best used sparingly.
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.
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.
https://www.zachleat.com/web/dont-let-the-door-hit-you-onunload-and-onbeforeunload/
Apr 22, 2008 · Hi Zach Leatherman, The code you put inside the onunload event handler would be executed only after the browser unloads the page. In my case, I have an synchronous AJAX request in unload event. when the user clicks the back button I had to …
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