beforeunload忽略条件 [英] beforeunload ignores condition
本文介绍了beforeunload忽略条件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想检测用户何时离开浏览器，但是我需要检查某些情况，下面的脚本跳过if(false)并始终提示请求，而不管返回true还是false.
I want to detect when user is leaving browser however I need to check on some condition, the script below skips the if(false) and always prompts for request regardless of returning true or false.
如何让它在提示之前检查条件?
How can I let it check condition before prompting?
<html>
<head>
<script type="text/javascript" src="http://code.jquery.com/jquery-2.1.3.min.js"></script>
</head>
<body>
<script type="text/javascript">
$(document).ready(function ()
{
$(window).bind('beforeunload', function () {
if (false)
return "Are you sure? Your changes will be lost!";
else
return false; // or true doesn't matter
});
});
</script>
</body>
</html>
推荐答案
我在示例中添加了一个文本框，并更改了条件，以在提示消息之前检查该值是否为1.
I've added a textbox to the example and the changed the condition to check if the value is 1 before prompting the message.
<html>
<head>
<script type="text/javascript" src="http://code.jquery.com/jquery-2.1.3.min.js"></script>
</head>
<body>
<!-- added textbox for verification //-->
<input type="text" id="text1"> </input>
<script type="text/javascript">
$(document).ready(function ()
{
$(window).bind('beforeunload', function () {
//changed the if condition to check if the value of the textbox is 1 and only prompt if it is 1
if ($('#text1').val()=="1")
return "Are you sure? Your changes will be lost!";
});
});
</script>
</body>
</html>
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