Find all needed information about Browser Onunload Support. Below you can see links where you can find everything you want to know about Browser Onunload Support.
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://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
Browser compatibility 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://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
Browser support: 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://community.adobe.com/t5/coldfusion/javascript-quot-onunload-quot-for-netscape/td-p/211572
Sep 11, 2007 · Hi, Netscape will not call the onUnload() event when the browser is closed by clicking on the "X" button in the top right corner of the browser window. Netscape will call the onUnload() event if the browser window is staying open but going to another URL. Does anybody know if there's a …
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://developer.mozilla.org/en-US/docs/Web/API/WindowEventHandlers/onbeforeunload
The HTML specification states that authors should use the Event.preventDefault() method instead of using Event.returnValue to prompt the user. However, this is not yet supported by all browsers. When this event returns (or sets the returnValue property to) a value other than null or undefined, the user will be prompted to confirm the page unload.In older browsers, the return value of the event ...
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