javascript - 如何等待浏览器关闭直到服务器调用完成？

Question

我正在尝试调用一项在浏览器关闭或选项卡关闭时更新数据的服务。问题是使用 $http 的服务调用及其异步，因此根据我的浏览器卸载事件取消该调用并关闭浏览器。我希望浏览器等到我收到该服务调用的响应/错误。

我尝试调用 e.preventDefault() 和 e.stopPropagation() 但它不起作用。

function releaseDocument(e) {
    EventService.releaseDocument().then(function() {
        window.close();
    }, function() {
        window.close();
    });
}

$window.onbeforeunload = releaseDocument;
$window.onunload = releaseDocument;

任何人都可以帮助或建议任何替代方案来实现同样的目标!？

Answer 1

也许我们可以通过使用同步 AJAX 调用来实现，这只是我的建议。

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We will show a confirmation box when you close browser/tab. at this same time we will call your service synchronously. But we should call this service before execute the confirm box line. So sync call will execute every line and return the result then only the confirmation will fire/ or close the tab. Si here we have few time to execute the function.

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 window.addEventListener("beforeunload", function (e) {
  var confirmationMessage = "Do you want close this browser";    
   releaseDocument()// it should be an sync function ( like you can set async:false in your ajax options 

  (e || window.event).returnValue = confirmationMessage; //Gecko + IE
  return confirmationMessage;                            //Webkit, Safari, Chrome
});