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页面内容已修改，您确定要离开？

 3 years ago
source link: http://abcdxyzk.github.io/blog/2021/05/30/lang-web-before/
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页面内容已修改，您确定要离开？

2021-05-30 17:34:00 

<input style='display:none' name='beforeunload' id='beforeunload' value='0'>

<button id='{$idpre}_edit' type='button' class=submit onclick=enable_all()>编辑</button>
<input id='{$addidpre}_submit' class='submit' type='submit' value='提交' onclick=submit_it()>
function enable_all() {
	var b = document.getElementById('beforeunload');
	if (b !== null)
		b.value = 2;
}

function submit_it() {
	var b = document.getElementById('beforeunload');
	if (b !== null)
		b.value = 1;
}

window.addEventListener("beforeunload", function(e) {
	var val = document.getElementById('beforeunload').value;
	if (val > 1) {
		var confirmationMessage = "您是否要离开 - 您输入的数据可能不会被保存。";
		(e || window.event).returnValue = confirmationMessage; // Gecko and Trident
		return confirmationMessage; // Gecko and WebKit});
	}
});

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