elementUI自定义弹窗zIndex问题
更新时间: 2022-12-23 11:06:40
因为公司的大屏项目需要自定义弹窗的样式，我选用了elementUI作为UI框架，所以直接复制了elementUI源码的dialog组件源码然后改了样式，本以为这样就可以大功告成了，结果，实际使用的时候发现，自己封装的弹窗组件的zIndex始终和elementUI自己的其他弹窗zIndex要小。
# 分析原因
通过观察可以发现elementUI的弹窗zIndex是从2000开始往上累加的，但我们自己封装的组件zIndex和elementUI的似乎不是同一套，它们各自从2000开始累加起。
# 查看源码
通过看源码发现dialog组件中引入了Popup组件
// element-ui/packages/dialog/src/component.vue
import Popup from 'element-ui/src/utils/popup';
import Migrating from 'element-ui/src/mixins/migrating';
import emitter from 'element-ui/src/mixins/emitter';
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然后去popup组件，找到引入了popup-manager
import Vue from 'vue';
import merge from 'element-ui/src/utils/merge';
import PopupManager from 'element-ui/src/utils/popup/popup-manager';
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然后找到popup-manager组件，发现这里存放着关于zIndex修改的组件：
Object.defineProperty(PopupManager, 'zIndex', {
configurable: true,
get() {
if (!hasInitZIndex) {
zIndex = zIndex || (Vue.prototype.$ELEMENT || {}).zIndex || 2000;
hasInitZIndex = true;
}
return zIndex;
},
set(value) {
zIndex = value;
}
});
nextZIndex: function() {
return PopupManager.zIndex++;
},
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因为所有组件引用的都是同一个PopupManager,所有会记录每个组件弹窗的zIndex,它们的zIndex是共享的，但是为什么我们自己封装的组件不行呢？
原因是在于我们自己封装的dialog,引用的是src中的，
import Popup from 'element-ui/src/utils/popup';
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但实际上我们使用的dialog组件并不是引用源码，而应该引用编译出来的依赖库，依赖库的路径为：
import Popup from 'element-ui/lib/utils/popup';
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到这里，再试一下，问题解决了~
# 完整自定义dialog代码
<template>
<transition
name="dialog-fade"
@after-enter="afterEnter"
@after-leave="afterLeave">
<div
v-show="visible"
class="el-dialog__wrapper"
@click.self="handleWrapperClick">
<div
role="dialog"
:key="key"
aria-modal="true"
:aria-label="title || 'dialog'"
:class="['el-dialog', { 'is-fullscreen': fullscreen, 'el-dialog--center': center }, customClass]"
ref="dialog"
:style="style">
<svg class="dv-border-svg-container" :width="dialogWidth" :height="dialogHeight">
<polygon class="border" :points="`
0,0
${dialogWidth * 0.3},0
${winWidth * 0.018 + dialogWidth * 0.3},${winWidth * 0.018}
${dialogWidth},${winWidth * 0.018}
${dialogWidth},${dialogHeight}
${winWidth * 0.01},${dialogHeight}
0,${dialogHeight - winWidth * 0.01}
`" />
</svg>
<div class="el-dialog__header">
<slot name="title">
<span class="el-dialog__title">{{ title }}</span>
</slot>
<button
type="button"
class="el-dialog__headerbtn"
aria-label="Close"
v-if="showClose"
@click="handleClose">
<i class="el-dialog__close el-icon el-icon-close"></i>
</button>
</div>
<div class="el-dialog__body" v-if="rendered"><slot></slot></div>
<div class="el-dialog__footer" v-if="$slots.footer">
<slot name="footer"></slot>
</div>
</div>
</div>
</transition>
</template>
<script>
import Popup from 'element-ui/lib/utils/popup';
import Migrating from 'element-ui/src/mixins/migrating';
import emitter from 'element-ui/src/mixins/emitter';
export default {
name: 'ElDialog',
mixins: [Popup, emitter, Migrating],
props: {
title: {
type: String,
default: ''
},
modal: {
type: Boolean,
default: true
},
modalAppendToBody: {
type: Boolean,
default: true
},
appendToBody: {
type: Boolean,
default: false
},
lockScroll: {
type: Boolean,
default: true
},
closeOnClickModal: {
type: Boolean,
default: true
},
closeOnPressEscape: {
type: Boolean,
default: true
},
showClose: {
type: Boolean,
default: true
},
width: String,
fullscreen: Boolean,
customClass: {
type: String,
default: ''
},
top: {
type: String,
default: '15vh'
},
beforeClose: Function,
center: {
type: Boolean,
default: false
},
destroyOnClose: Boolean
},
data() {
return {
closed: false,
key: 0,
winWidth:document.documentElement.getBoundingClientRect().width,
winHeight:document.documentElement.getBoundingClientRect().height,
dialogWidth:0,
dialogHeight:0
};
},
watch: {
visible(val) {
if (val) {
this.closed = false;
this.$emit('open');
this.$el.addEventListener('scroll', this.updatePopper);
this.$nextTick(() => {
this.$refs.dialog.scrollTop = 0;
});
if (this.appendToBody) {
document.body.appendChild(this.$el);
}
this.resize()
} else {
this.$el.removeEventListener('scroll', this.updatePopper);
if (!this.closed) this.$emit('close');
if (this.destroyOnClose) {
this.$nextTick(() => {
this.key++;
});
}
}
}
},
computed: {
style() {
let style = {};
if (!this.fullscreen) {
style.marginTop = this.top;
if (this.width) {
style.width = this.width;
}
}
return style;
}
},
methods: {
getMigratingConfig() {
return {
props: {
'size': 'size is removed.'
}
};
},
handleWrapperClick() {
if (!this.closeOnClickModal) return;
this.handleClose();
},
handleClose() {
if (typeof this.beforeClose === 'function') {
this.beforeClose(this.hide);
} else {
this.hide();
}
},
hide(cancel) {
if (cancel !== false) {
this.$emit('update:visible', false);
this.$emit('close');
this.closed = true;
}
},
updatePopper() {
this.broadcast('ElSelectDropdown', 'updatePopper');
this.broadcast('ElDropdownMenu', 'updatePopper');
},
afterEnter() {
this.$emit('opened');
},
afterLeave() {
this.$emit('closed');
},
resize(){
setTimeout(() => {
this.winWidth = document.documentElement.getBoundingClientRect().width
this.winHeight = document.documentElement.getBoundingClientRect().height
const dom = this.$refs['dialog']
this.dialogWidth = dom ? dom.clientWidth : 0
this.dialogHeight = dom ? dom.clientHeight : 0
},300)
}
},
mounted() {
if (this.visible) {
this.rendered = true;
this.open();
if (this.appendToBody) {
document.body.appendChild(this.$el);
}
window.addEventListener('resize',this.resize,false)
this.resize()
}
},
destroyed() {
// if appendToBody is true, remove DOM node after destroy
if (this.appendToBody && this.$el && this.$el.parentNode) {
this.$el.parentNode.removeChild(this.$el);
}
window.removeEventListener('resize',this.resize)
}
};
</script>
<style lang="scss" scoped>
.el-dialog{
background: transparent;
box-shadow:none;
.dv-border-svg-container {
position: absolute;
width: 100%;
height: 100%;
top: 0px;
left: 0px;
z-index:-1;
}
.border{
stroke:rgba(27, 196, 205, 1);
fill:rgba(0, 20, 53, 1);
stroke-width: 1;
}
.el-dialog__header{
padding:0.5vw;
text-align: left;
}
.el-dialog__title{
font-size:0.83rem;
color:#ffffff;
line-height: 2vw;
padding-left:0.83rem;
}
.el-dialog__headerbtn{
top:0.9vw;
right:-0.9vw;
width:1.8vw;
height:1.8vw;
border-radius: 50%;
background: #0C286F;
border: 1px solid #31CBFF
}
.el-dialog__headerbtn .el-dialog__close{
color:rgba(255,255,255,0.7);
&:hover{
color:#ffffff;
}
}
}
</style>
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完成啦，这是一个用svg作为背景，支持自适应的弹窗组件~