Find all needed information about Onbeforeunload Event Support. Below you can see links where you can find everything you want to know about Onbeforeunload Event Support.
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 …
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://developer.mozilla.org/en-US/docs/Web/API/Window/beforeunload_event
According to the specification, to show the confirmation dialog an event handler should call preventDefault() on the event. However note that not all browsers support this method, and some instead require the event handler to implement one of two legacy methods: assigning a string to the event's returnValue property
http://help.dottoro.com/ljhtbtum.php
The onbeforeunload event is not cancelable, because of security reasons, but if an event handler function for the onbeforeunload event returns a string value, this text will be shown in a confirmation dialog box, where the user can confirm whether he wants to stay or leave the current page.
https://community.adobe.com/t5/captivate/ie-onbeforeunload-event-and-javascript-calls/td-p/5329614
Jul 23, 2013 · If you've ever attempted this kind of thing, there are two browser events (speaking specifically about IE 7/8 which is my target browser) - onbeforeunload and onunload that can be used to trigger the display of a dialog when the user tries to close the browser window/tab. Both of these are somewhat problimatic but generally workable.
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://www.w3schools.com/Tags/ev_onbeforeunload.asp
The onbeforeunload event fires 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://stackoverflow.com/questions/20773306/mozilla-firefox-not-working-with-window-onbeforeunload
I looked for a Firefox onbeforeunload solution over 2 days and with no luck, so I worked hard on this, and did it with a little trick.. In my trick, the user needs to click on the browser window at least once. If the user clicks on the window and then clicks on the back button, refreshes the page, or tries to exit the page, onbeforeunload events will fire,
https://forums.developer.apple.com/thread/47528
May 23, 2016 · Hi, I am new to ios development. I searched safari web content guide and found there is no support for onbeforeunload event. Can you please let me know
https://developer.mozilla.org/en-US/docs/Web/API/Window/unload_event
The unload event is fired when the document or a child resource is being unloaded.
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