JS检测离开页面时表单数据是否更改
function formIsDirty(form) {for (var i = 0; i < form.elements.length; i++) {
var element = form.elements[i];
var type = element.type;
if (type == "checkbox" || type == "radio") {
if (element.checked != element.defaultChecked) {
return true;
}
}
else if (type == "hidden" || type == "password" || type == "text" || type == "textarea") {
if (element.value != element.defaultValue) {
return true;
}
}
else if (type == "select-one" || type == "select-multiple") {
for (var j = 0; j < element.options.length; j++) {
if (element.options[j].selected != element.options[j].defaultSelected) {
return true;
}
}
}
}
return false;
}
window.onbeforeunload = function (e) {
e = e || window.event;
if (formIsDirty(document.forms["someForm"])) {
// IE 和 Firefox
if (e) {
e.returnValue = "对不起，页面数据已做修改，尚未保存，确定要刷新或离开本页面？";
}
// Safari浏览器
return "对不起，页面数据已做修改，尚未保存，确定要刷新或离开本页面？";
}
};
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