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    <p>Your probably thinking of a synchronous ajax request (which blocks the UI):</p> <pre><code>window.addEventListener('unload',function() { var xhr = new XMLHttpRequest(); xhr.open('GET', 'script.php?when=unload',false);//&lt;-- false makes request synchronous xhr.send(); },false); </code></pre> <p>But <a href="https://stackoverflow.com/questions/2970782/javascript-wait-until-ajax-request-finishes-to-close-page">there are other ways, check this answer</a><Br/> On the whole, I'd <em>not</em> do things like this. If a site attempted to deny me the option of closing the window when I feel like it, I'd never use/visit it again. That, and the fact that your JS code is still subject to how the browser implements it, and the browser can be controlled by the client's OS. If I close the browser application, a JS event has nothing to say in that matter, especially if I terminate the browser process (using <code>kill -9</code>, or ctrl+alt+del).</p> <p>The very least you can do is offer the client a choice, to either force-quit, or wait, explaining why you'd rather the client waited a while:</p> <pre><code>window.addEventListener('beforeunload',function u(e) { var forceQuit = confirm('\tDo you wish to leave Now?\n if you do, some changes you made won\'t be saved'); if (forceQuit) { return e; } //synchronous ajax result here, or: e.returnValue = false; e.cancelBubble = true; if (e.preventDefault) { e.preventDefault(); e.stopPropagation(); } setTimeout(function() {//first, remove handler, so the beforeunload's behaviour is back to default window.removeEventListener('beforeunload',u,false); //dispatch new beforeunload event: window.dispatchEvent( new Event('beforeunload')); },5000); },false); </code></pre>
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    1. COI wouldn't do it either if I had a choice but... Upper one works if user clicks link or refreshes, but not when he closes tab. Any help with that? I don't need a confirmation, and it doesn't matter if browser is terminated.
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    2. CO@user1829015: change the `unload` event to `beforeunload`, if needs must, attach it directly to the window (`window.onbeforeunload = function(e){};`. PS: It _does_ matter if the browser is terminated, because in most browsers, each tab is a new process. By closing that, you close the current window. Closing a tab === teminating the browser, as far as your JS script is concerned. A `confirm` is just for the user. I'd hate being forced to wait for a script to finish running. I didn't _ask_ for it (that's how your users will feel). JS will never (thank god) give you full control
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

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