on window close give alert javascript

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Alycia
29 Apr 2017
1let disableConfirmation = false;
2window.addEventListener('beforeunload', event => {
3  const confirmationText = 'Are you sure?';
4  if (!disableConfirmation) {
5    event.returnValue = confirmationText; // Gecko, Trident, Chrome 34+
6    return confirmationText;              // Gecko, WebKit, Chrome <34
7  } else {
8    // Set flag back to false, just in case
9    // user stops loading page after clicking a link.
10    disableConfirmation = false;
11  }
12});
13
14After Confimation if you want to send any ajax request and you have used jquery
15 $(window).on('unload', function() {
16   // async: false will make the AJAX synchronous in case you're using jQuery
17   axios
18     .get('ajax_url')
19     .then(response => {});
20 });
21
22And if no jquery is used you can use navigator, it require navigator library
23
24navigator.sendBeacon(url, data);
25
26
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