在卸载之前检查是否保存了更改 [英] check if changes saved before unload
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问题描述
我有以下javaScript
I have the following javaScript
编辑：包含的cahngesSaved分配
var changesSaved = true;
$(document).ready(function () {
$(".applyChanges").click(function (e) {
e.preventDefault();
var id = (this).id;
var dayofweek = document.getElementById("dayofweek" + id).value;
var hour = document.getElementById("hour" + id).value;
var duration = document.getElementById("duration" + id).value;
$.ajax({
url: '@Url.Action("ApplyChanges")',
type: 'POST',
data: {
id: id,
dayofweek: dayofweek,
hour: hour,
duration: duration
},
success: function (data) {
$('#Calendar').fullCalendar('refetchEvents')
$('#Calendar2').fullCalendar('refetchEvents')
changesSaved = false;
}
});
});
});
window.onbeforeunload = function () {
if (changesSaved == true) {
return true;
} else {
return ("You havent saved your changes. Are you sure you want to leave the page?")
}
}
但是无论设置的changeSaved是什么，都会提示消息。
but the message is being prompted regardless of what changesSaved is set too.
我实际得到的是以下内容：
What actually I actually get is the following:
或者如果changesSaved设置为false，则说明为false。
or if changesSaved is set to false it says false instead.
我不能这样做吗？
推荐答案
<body onbeforeunload="return bye()">
function bye(){
if(changesSaved) {
return "You havent saved your changes."
}
}
我就是这样做的。
或纯JavaScript：
or in pure JavaScript:
window.onbeforeunload = function() {
if (changesSaved) {
return "You haven't saved your changes.";
}
};
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