在 onbeforeunload 事件中将请求发送回服务器
当用户在我的应用程序中编辑记录时，我跟踪他们已将其“锁定”，以防止其他用户编辑它，直到第一个用户关闭窗口（或保存）。
我正在尝试将请求发送回服务器以解锁记录，但它在 Firefox 中不起作用。 onbeforeunload 事件在脚本中调用，但它不会将请求发送回服务器。 有什么想法吗？
<body>
<script>
window.onbeforeunload = function (e) {
doUnlock();
}
function doUnlock() {
if (navigator.appName == 'Microsoft Internet Explorer') {
// works in IE (with an IFRAME)
utilFrame.location.href = "/unlock.do?recordId=" + recordId;
} else if (navigator.appName == 'Netscape') {
// None of this works....
//window.location.href = "/unlock.do?recordId=" + recordId;
var req = newXMLHttpRequest();
req.open("GET", "/unlock.do?recordId=" + recordId, true);
req.send();
} else {
// Works for chrome
window.open("/unlock.do?recordId=" + recordId);
}
}
</script>
When a user edits a record in my application I track that they have it 'locked' to prevent another user from editing it until the first user closed the window (or saves).
I'm trying to send the request back to the server to unlock the record but it's not working in Firefox. The onbeforeunload event is called in script but it's not sending back the request to the server.
Any ideas?
<body>
<script>
window.onbeforeunload = function (e) {
doUnlock();
}
function doUnlock() {
if (navigator.appName == 'Microsoft Internet Explorer') {
// works in IE (with an IFRAME)
utilFrame.location.href = "/unlock.do?recordId=" + recordId;
} else if (navigator.appName == 'Netscape') {
// None of this works....
//window.location.href = "/unlock.do?recordId=" + recordId;
var req = newXMLHttpRequest();
req.open("GET", "/unlock.do?recordId=" + recordId, true);
req.send();
} else {
// Works for chrome
window.open("/unlock.do?recordId=" + recordId);
}
}
</script>
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在
new和XMLHttpRequest之间添加一个空格。页面卸载时，任何挂起的 (AJAX) 请求都会被*取消。如果您必须在卸载时向服务器发送 AJAX 请求，请使用同步请求（不推荐！！！）：
我不推荐同步请求，因为用户界面会阻塞，直到请求完成为止。完成的。这对用户来说不太友好。
Add a space between
newandXMLHttpRequest.On page unload, any pending (AJAX) requests are *cancelled. If you have to send an AJAX request to the server on unload, use a synchronous request (not recommended!!!):
I do not recommend the synchronous request, because the user interface blocks until the request has finished. That's not very user-friendly.
您应该考虑使用基于时间的锁。当用户开始编辑记录时，使用时间戳将其锁定。每 30 秒从用户发送一次 ping，表明记录仍应被锁定。如果60秒内没有ping则解锁记录。
You should look into using a time based lock. When a user starts editing a record lock it with a timestamp. Every 30 seconds send a ping from the user that the record should still be locked. If there is no ping for 60 seconds unlock the record.