Javascript Onbeforeunload Support Browsers

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javascript - onbeforeunload support detection - Stack Overflow

    https://stackoverflow.com/questions/158673/onbeforeunload-support-detection
    Mobile browsers don't tend to not support beforeunload because the browser can go into the background without unloading the page, then be killed by the operating system at any time. However, all modern non-mobile browsers support it. Therefore, you can just check if the browser is a …

onbeforeunload Event - w3schools.com

    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 …

WindowEventHandlers.onbeforeunload - Web APIs MDN

    https://developer.mozilla.org/en-US/docs/Web/API/WindowEventHandlers/onbeforeunload
    WindowEventHandlers.onbeforeunload. Web technology for developers. ... To combat unwanted pop-ups, some browsers don't display prompts created in beforeunload event handlers unless the page has been interacted with. Moreover, some don't display them at all. ... Full support Full support No support ...

Window: beforeunload event - Web APIs MDN

    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 ignored during this event.

ECMAScript 6 compatibility table

    http://kangax.github.io/compat-table/es6/
    Desktop browsers Servers/runtimes Mobile; Feature name Current browser ES6 Trans-piler Traceur Babel 6 + core-js 2 Babel 7 + core-js 2 Babel 7 + core-js 3 Closure 2018.02 Closure 2019.02 Closure 2019.03 Closure 2019.03 Closure 2019.07 Closure 2019.10 Closure 2020.01 Closure 2020.01 JSX Type-Script + core-js 2 Type-Script + core-js 2 Type-Script ...

WindowEventHandlers.onunload - Web APIs MDN

    https://developer.mozilla.org/en-US/docs/Web/API/WindowEventHandlers/onunload
    WindowEventHandlers.onunload. ... Note: Browsers equipped with pop-up blockers will ignore all Window.open() method calls in onunload event handler functions. Syntax ... Full support 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 ...

onbeforeunload event beforeunload event JavaScript

    http://help.dottoro.com/ljhtbtum.php
    Occurs before the browser unloads the document and provides a possibility to display a confirmation dialog, where the user can confirm whether he wants to stay or leave the current page. 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 ...

JavaScript : window.onbeforeunload

    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.

window.onunload is not working as expected. Firefox ...

    https://support.mozilla.org/en-US/questions/993972
    All my code is in window.onbeforeunload which used to work in previous version of firefox . But with the latest version code is executing only on closing the tab but not in the browser close or refresh . So i kept return statement in the window.onbeforeunload and all the code in the window.onunload .

onunload Event

    https://www.w3schools.com/jsref/event_onunload.asp
    Definition and Usage. 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.).



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