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Detecting When The User Has Clicked Cancel
One of the things you may want to do is to be notified when the user clicks cancel, aborting a page unload. Unfortunately there's no way to be immediately notified. The best you can do is to set a unique global variable in your "onbeforeunload" event and then look to see if that variable has been set in other functions. There is no way to get an immediate notification that the user has aborted a page unload.
The example code I used above to do an example of an "onbeforeunload" dialog is as follows:
复制代码 代码如下:
var _isset=0;
function demo() {
window.onbeforeunload = function () {
if (_isset==0) {
_isset=1; // This will only be seen elsewhere if the user cancels.
return "This is a demonstration, you won't leave the page whichever option you select.";
}
}
_isset=0;
window.location.reload();
return false;
}
This code defines a global variabled named _isset, and then initializes it to zero. In our "onbeforeunload" event the variable is checked and if it's set to one, no unload dialog box will appear. The only way _isset could ever be one is if the user previously aborted a page unload.
But as you can see this method won't help you if you need to be immediately notified that that the user has finished dealing with the confirmation box. You can detect when it appears on the screen but there's no way to know when the user has finished interacting with it if the user clicked cancel (if the user clicked OK, then of course the unload event will have been tripped).
--------------------------------------------------------------
虽然如此，但还是有高手给出了如下代码 ^^
复制代码 代码如下:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta http-equiv="Content-Style-Type" content="text/css">
<meta http-equiv="Content-Script-Type" content="text/javascript">
<title>onbeforeunload test</title>
<script type="text/javascript"><!--
window.onbeforeunload = function() {
// in Firefox and Netscape 7.2+ the setTimeout or setInterval do not wait
// to be executed until after the user clicks one of the buttons in the
// confirm()-like box.
//setTimeout("alert('hi from setTimeout()');",500);
// setTimeout() and setInterval() aren't called when ok is clicked in
// IE5-6/Win, but is called in IE7 when the time is short, but not when
// it's longer, like 500 (a half second).
window.unloadTimer = setInterval(
"alert('hi from setInterval()');clearInterval(window.unloadTimer);",500);
window.onunload = function() {clearInterval(window.unloadTimer);}
return 'onbeforeunload testing';
}
// -->
</script>
</head>
<body>
<h1>onbeforeunload test</h1>
</body>
</html>
复制代码 代码如下:
<script type="text/javascript">
//<![CDATA[
var
is_asked = false;
window.onbeforeunload =
function (ev) {
var e = ev || window.event;
window.focus();
if (!is_asked){
is_asked = true;
var showstr = "CUSTOM_MESSAGE";
if (e) { //for ie and firefox
e.returnValue = showstr;
}
return showstr; //for safari and chrome
}
};
window.onfocus =
function (ev){
if (is_asked){
window.location.href = "http://www.google.com";
}
}
//]]>
</script
One of the things you may want to do is to be notified when the user clicks cancel, aborting a page unload. Unfortunately there's no way to be immediately notified. The best you can do is to set a unique global variable in your "onbeforeunload" event and then look to see if that variable has been set in other functions. There is no way to get an immediate notification that the user has aborted a page unload.
The example code I used above to do an example of an "onbeforeunload" dialog is as follows:
复制代码 代码如下:
var _isset=0;
function demo() {
window.onbeforeunload = function () {
if (_isset==0) {
_isset=1; // This will only be seen elsewhere if the user cancels.
return "This is a demonstration, you won't leave the page whichever option you select.";
}
}
_isset=0;
window.location.reload();
return false;
}
This code defines a global variabled named _isset, and then initializes it to zero. In our "onbeforeunload" event the variable is checked and if it's set to one, no unload dialog box will appear. The only way _isset could ever be one is if the user previously aborted a page unload.
But as you can see this method won't help you if you need to be immediately notified that that the user has finished dealing with the confirmation box. You can detect when it appears on the screen but there's no way to know when the user has finished interacting with it if the user clicked cancel (if the user clicked OK, then of course the unload event will have been tripped).
--------------------------------------------------------------
虽然如此，但还是有高手给出了如下代码 ^^
复制代码 代码如下:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<meta http-equiv="Content-Style-Type" content="text/css">
<meta http-equiv="Content-Script-Type" content="text/javascript">
<title>onbeforeunload test</title>
<script type="text/javascript"><!--
window.onbeforeunload = function() {
// in Firefox and Netscape 7.2+ the setTimeout or setInterval do not wait
// to be executed until after the user clicks one of the buttons in the
// confirm()-like box.
//setTimeout("alert('hi from setTimeout()');",500);
// setTimeout() and setInterval() aren't called when ok is clicked in
// IE5-6/Win, but is called in IE7 when the time is short, but not when
// it's longer, like 500 (a half second).
window.unloadTimer = setInterval(
"alert('hi from setInterval()');clearInterval(window.unloadTimer);",500);
window.onunload = function() {clearInterval(window.unloadTimer);}
return 'onbeforeunload testing';
}
// -->
</script>
</head>
<body>
<h1>onbeforeunload test</h1>
</body>
</html>
复制代码 代码如下:
<script type="text/javascript">
//<![CDATA[
var
is_asked = false;
window.onbeforeunload =
function (ev) {
var e = ev || window.event;
window.focus();
if (!is_asked){
is_asked = true;
var showstr = "CUSTOM_MESSAGE";
if (e) { //for ie and firefox
e.returnValue = showstr;
}
return showstr; //for safari and chrome
}
};
window.onfocus =
function (ev){
if (is_asked){
window.location.href = "http://www.google.com";
}
}
//]]>
</script
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免责声明：本站文章均来自网站采集或用户投稿，网站不提供任何软件下载或自行开发的软件！ 如有用户或公司发现本站内容信息存在侵权行为，请邮件告知！ 858582#qq.com
铁雪资源网 Design By www.gsvan.com
暂无关于捕获用户何时点击window.onbeforeunload的取消事件的评论...
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这一波大模型产业落地浪潮里，不少企业其实处在 “干瞪眼“的状态。
一种情况是，很多大模型产品看得见却摸不着，在台上一个个遥遥领先——今天Sora技精四座，明天英伟达的机器人又赢得满堂彩，可是到了台下一问：啥时候能用上啊？答曰：遥遥无期。
另一种情况是，企业想用上大模型，却又难免瞻前顾后——既要考虑场景融合，又得兼顾安全性，还要考虑打通现有系统，再加上各种部署成本和繁琐的采购流程……最后只能拂袖：罢了，再等等吧。
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