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clickOutside原理.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>ClickOutside</title>
<style>
* {
margin: 0; padding: 0; box-sizing: border-box;
}
.drop-down {
margin: 50px;
position: relative;
display: inline-block;
}
.popper {
background: rgba(0, 0, 0, 0.5);
color: #fff;
padding: 20px 30px;
position: absolute;
top: 30px;
left: 0;
display: none;
}
.show {
display: block;
}
[v-cloak] {
display: none;
}
.popup {
background: rgba(0, 0, 0, 0.5);
color: #fff;
padding: 20px 30px;
position: absolute;
top: 30px;
left: 0;
}
</style>
</head>
<body>
<!-- <div class="drop-down">
<button class="btn">点击</button>
<div class="popper">
弹窗
</div>
</div>
<script>
const dropDown = document.querySelector('.drop-down')
const btn = document.querySelector('.btn')
const popper = document.querySelector('.popper')
btn.addEventListener('click', () => {
popper.classList.toggle('show')
})
document.addEventListener('click', (e) => {
// console.log(e, dropDown.contains(e.target))
if (dropDown.contains(e.target)) {
return
}
popper.classList.remove('show')
})
</script> -->
<!-- Vue 用指令来实现下 -->
<div id="app" v-cloak>
<div class="drop-down" v-click-outside="hidePopup">
<button class="btn" @click="changShow">{{ !isShow ? '显示' : '隐藏' }}</button>
<div class="popup" v-if="isShow">弹窗内容</div>
</div>
</div>
<script src="https://unpkg.com/vue@3/dist/vue.global.js"></script>
<script>
const { createApp, ref } = Vue
createApp({
directives: {
clickOutside: {
mounted (el, binding, vnode, prevVnode) {
console.log(el, binding, vnode, prevVnode)
el.__outsideEvent__ = (e) => {
if (el.contains(e.target)) {
return
}
binding.value()
}
document.addEventListener('click', el.__outsideEvent__)
},
unmounted (el, binding, vnode, prevVnode) {
console.log(el, binding, vnode, prevVnode)
document.removeEventListener('click', el.__outsideEvent__)
delete el.__outsideEvent__
}
}
},
setup() {
const isShow = ref(false)
const changShow = () => {
isShow.value = !isShow.value
}
const hidePopup = () => {
isShow.value = false
}
return {
isShow,
changShow,
hidePopup
}
}
}).mount('#app')
</script>
</body>
</html>