值
一个字符串。可能的值为 "open"（弹窗正在从显示状态变为隐藏状态）或 "closed"（弹窗正在从隐藏状态变为显示状态）。
示例
js
const popover = document.getElementById("mypopover");
// …
popover.addEventListener("beforetoggle", (event) => {
if (event.oldState === "open") {
console.log("Popover is being hidden");
} else {
console.log("Popover is being shown");
}
});
规范
| 规范 |
|---|
| HTML # dom-toggleevent-oldstate |
浏览器兼容性
加载中…