首先在開發時需要考慮以下三點:
1、進入和彈出的動畫效果。
2、z-index 的控制
3、overlay 遮蓋層
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外部可以由使用者自行控制，使用 v-if 或 v-show 控制顯示
z-index 的控制 1、確保彈出框足夠的 z-index 高能量使其再最外層
2、後彈出的彈出框的 z-index 要比之前彈出的高
<template>
<div class="modal" transition="modal-scale">
<!--省略其它内容-->
</div>
</template>
<script>
// ...
</script>
<style>
.modal-scale-transition{
transition: transform,opacity .3s ease;
}
.modal-scale-enter,
.modal-scale-leave {
opacity: 0;
}
.modal-scale-enter {
transform: scale(1.1);
}
.modal-scale-leave {
transform: scale(0.8);
}
</style>const zIndex = 20141223 // 先预设较高值
const getZIndex = function () {
return zIndex++ // 每次获取之后 zindex 自动增加
}遮蓋層是彈窗組件中最難處理的部分, 一個完美的遮蓋層的控制需要完成以下幾點:
、遮蓋層與彈出層之間的動畫需要並行<template>
<div class="modal" :style="{'z-index': zIndex}" transition="modal-scale">
<!--省略其它内容-->
</div>
</template>
<script>
export default {
data () {
return {
zIndex: getZIndex()
}
}
}
</script><template>
<div class="overlay" @click="handlerClick" @touchmove="prevent" :style="style" transition="overlay-fade"></div>
</template>
<script>
export default {
props: {
onClick: {
type: Function
},
opacity: {
type: Number,
default: 0.4
},
color: {
type: String,
default: '#000'
}
},
computed: {
style () {
return {
'opacity': this.opacity,
'background-color': this.color
}
}
},
methods: {
prevent (event) {
event.preventDefault()
event.stopPropagation()
},
handlerClick () {
if (this.onClick) {
this.onClick()
}
}
}
}
</script>
<style lang="less">
.overlay {
position: fixed;
left: 0;
right: 0;
top: 0;
bottom: 0;
background-color: #000;
opacity: .4;
z-index: 1000;
}
.overlay-fade-transition {
transition: all .3s linear;
&.overlay-fade-enter,
&.overlay-fade-leave {
opacity: 0 !important;
}
}
</style>最後再封裝成一個mixin
import Vue from 'vue'
import overlayOpt from '../overlay' // 引入 overlay 组件
const Overlay = Vue.extend(overlayOpt)
const getDOM = function (dom) {
if (dom.nodeType === 3) {
dom = dom.nextElementSibling || dom.nextSibling
getDOM(dom)
}
return dom
}
// z-index 控制
const zIndex = 20141223
const getZIndex = function () {
return zIndex++
}
// 管理
const PopupManager = {
instances: [], // 用来储存所有的弹出层实例
overlay: false,
// 弹窗框打开时 调用此方法
open (instance) {
if (!instance || this.instances.indexOf(instance) !== -1) return
// 当没有遮盖层时，显示遮盖层
if (this.instances.length === 0) {
this.showOverlay(instance.overlayColor, instance.overlayOpacity)
}
this.instances.push(instance) // 储存打开的弹出框组件
this.changeOverlayStyle() // 控制不同弹出层 透明度和颜色
// 给弹出层加上z-index
const dom = getDOM(instance.$el)
dom.style.zIndex = getZIndex()
},
// 弹出框关闭方法
close (instance) {
let index = this.instances.indexOf(instance)
if (index === -1) return
Vue.nextTick(() => {
this.instances.splice(index, 1)
// 当页面上没有弹出层了就关闭遮盖层
if (this.instances.length === 0) {
this.closeOverlay()
}
this.changeOverlayStyle()
})
},
showOverlay (color, opacity) {
let overlay = this.overlay = new Overlay({
el: document.createElement('div')
})
const dom = getDOM(overlay.$el)
dom.style.zIndex = getZIndex()
overlay.color = color
overlay.opacity = opacity
overlay.onClick = this.handlerOverlayClick.bind(this)
overlay.$appendTo(document.body)
// 禁止页面滚动
this.bodyOverflow = document.body.style.overflow
document.body.style.overflow = 'hidden'
},
closeOverlay () {
if (!this.overlay) return
document.body.style.overflow = this.bodyOverflow
let overlay = this.overlay
this.overlay = null
overlay.$remove(() => {
overlay.$destroy()
})
},
changeOverlayStyle () {
if (!this.overlay || this.instances.length === 0) return
const instance = this.instances[this.instances.length - 1]
this.overlay.color = instance.overlayColor
this.overlay.opacity = instance.overlayOpacity
},
// 遮盖层点击处理，会自动调用 弹出层的 overlayClick 方法
handlerOverlayClick () {
if (this.instances.length === 0) return
const instance = this.instances[this.instances.length - 1]
if (instance.overlayClick) {
instance.overlayClick()
}
}
}
window.addEventListener('keydown', function (event) {
if (event.keyCode === 27) { // ESC
if (PopupManager.instances.length > 0) {
const topInstance = PopupManager.instances[PopupManager.instances.length - 1]
if (!topInstance) return
if (topInstance.escPress) {
topInstance.escPress()
}
}
}
})
export default PopupManager使用
ee總結
