這次帶給大家vue組件做出無限層級多選效果，vue組件做出無限層級多選效果的注意事項有哪些，下面就是實戰案例，一起來看一下。
原理：每一個多選框都是一個節點，每個節點就是一個wTree元件，有父級（頂級level為0）,有子級（底層list[]是空的），元件之間狀態傳遞是透過元件通訊傳遞，對於外部資料checkList陣列的修改是透過store實現的。初始化從底層狀態傳遞到上層，一層一層傳遞。改變狀態，不同狀態改變，修改checklist陣列。大概就這個思路，下面是程式碼：
<template>
<p>
<p >
<span v-for="o in levelNum"> </span>
<i v-if="item.list" :class="open ? openClass : closeClass" @click="showSub" style="color: #00d6b2"></i>
<span v-else> </span>
<span>
<a @click="changeState">
<img src="./../assets/selectedAll.png" v-if="selectedState === 'all'" width="15px" height="15px"/>
<img src="./../assets/selectedSub.png" v-if="selectedState === 'sub'" width="15px" height="15px"/>
<img src="./../assets/selectedNull.png" v-if="selectedState === 'null'" width="15px" height="15px"/>
</a>
</span>
<span>{{item.name}}</span>
</p>
<component v-show="open" :is="node" :item="o" :state="stateSub" v-for="o of item.list" :key="o.key" :level="levelNum" v-on:changeToPar="changeBySub">
</component>
</p>
</template>
<script>
export default {
name: 'wTree',
props: ['item', 'level', 'state'],
data () {
return {
open: true,
node: 'wTree', // 控制菜单开关的
selected: false, // 选中的情况下
selectedState: 'null', // 子组件被选中的情况下向上传递all/sub/null
originInfo: 'create', // 组件信息源，create/parent/children/this
openClass: 'el-icon-caret-bottom',
closeClass: 'el-icon-caret-right',
selectClass: 'el-icon-check',
selectBg: '#1c8de0',
list: [],
createSwitch: true
}
},
computed: {
levelNum () {
return (this.level + 1)
},
stateSub () {
return {
selected: this.selected,
originInfo: this.originInfo
}
}
},
methods: {
showSub () {
this.open = !this.open
},
changeState () {
if (this.selected) {
this.selected = false
this.selectedState = 'null'
this.originInfo = 'this'
for (let o of this.list) {
o.selectedState = 'null'
}
} else {
this.selected = true
this.selectedState = 'all'
this.originInfo = 'this'
for (let o of this.list) {
o.selectedState = 'all'
}
}
let data = {
id: this.item.menuId,
selectedState: this.selectedState,
originInfo: 'parent'
}
this.$emit('changeToPar', data)
},
changeBySub (data) {
// 如果是父组件true,判断状态，未被选中，添加id到list，selectSub=true,通知父组件，添加store的数组中，选中通知父组件，this.list.length=this.length状态改为selected
// 修改自身状态，添加list
let temp = data
if (data.originInfo === 'create') {
this.list.push(data)
} else {
this.originInfo = 'parent'
let stateNull = 'null'
let stateAll = 'all'
let stateSub = 'sub'
for (let o of this.list) {
if (o.id === temp.id) {
o.selectedState = temp.selectedState
}
if (o.selectedState !== 'all') {
stateAll = null
}
if (o.selectedState !== 'null') {
stateNull = null
}
}
if (stateNull) {
this.selectedState = stateNull
this.selected = false
} else if (stateAll) {
this.selectedState = stateAll
this.selected = true
} else {
this.selectedState = stateSub
this.selected = true
}
let data = {
id: this.item.menuId,
selectedState: this.selectedState,
originInfo: 'parent'
}
this.$emit('changeToPar', data)
}
}
},
watch: {
selected () {
// 初始化
if (this.originInfo === 'create') {
// 不改变值
} else {
// 改变值********
if (this.selected) {
// 添加值
this.$store.commit('PUSH_CHECK_LIST', this.item.menuId)
} else {
// 删除值
this.$store.commit('SPLICE_CHECK_LIST', this.item.menuId)
}
}
},
state () {
// 子组件得到通知，如果状态一直，不去改变，如果状态不一致改变
if (this.state.originInfo === 'this') {
this.originInfo = 'this'
}
if (this.originInfo === 'create') {
this.originInfo = 'children'
} else {
if (this.state.originInfo !== 'parent') {
if (this.state.selected) {
this.selected = true
this.selectedState = 'all'
if (this.list !== []) {
for (let o of this.list) {
o.selectedState = 'all'
}
}
} else {
this.selected = false
this.selectedState = 'null'
if (this.list !== []) {
for (let o of this.list) {
o.selectedState = 'null'
}
}
}
}
}
},
list () {
// 初始化数组
if (this.list.length === this.item.list.length) {
let stateNull = 'null'
let stateAll = 'all'
let stateSub = 'sub'
for (let o of this.list) {
if (o.selectedState !== 'all') {
stateAll = null
}
if (o.selectedState !== 'null') {
stateNull = null
}
}
if (stateNull) {
this.selectedState = stateNull
this.selected = false
} else if (stateAll) {
this.selectedState = stateAll
this.selected = true
} else {
this.selectedState = stateSub
this.selected = true
}
let data = {
id: this.item.menuId,
selectedState: this.selectedState,
originInfo: 'create'
}
this.$emit('changeToPar', data)
}
}
},
created () {
// 初始化，把每个组件，从最底层添加到节点列表中，这样每个子组件都在list中了，就是originInfo=create的情况下添加数组，就不用判断数组长度，直接改变状态
if (this.createSwitch) {
let i = this.$store.state.checkList.indexOf(this.item.menuId)
console.log(!this.item.list)
console.log('-----------------------初始化')
if (!this.item.list) {
if (i > -1) {
this.selectedState = 'all'
this.selected = true
} else {
this.selectedState = 'null'
this.selected = false
}
let data = {
id: this.item.menuId,
selectedState: this.selectedState,
originInfo: 'create'
}
this.$emit('changeToPar', data)
this.originInfo = 'this'
}
this.createSwitch = false
}
console.log(this.state)
console.log('----------------created')
},
updated () {
console.log('-------updated=======')
let i = this.$store.state.checkList.indexOf(this.item.menuId)
console.log(!this.item.list)
console.log('-----------------------初始化')
if (!this.item.list) {
if (i > -1) {
this.selectedState = 'all'
this.selected = true
} else {
this.selectedState = 'null'
this.selected = false
}
let data = {
id: this.item.menuId,
selectedState: this.selectedState,
originInfo: 'parent'
}
this.$emit('changeToPar', data)
this.originInfo = 'this'
}
},
mounted () {
console.log('=========mounted-----')
}
}
</script>呼叫orgList帶有層級的json陣列
<w-tree v-for="o of orgList" :item= "o" :level="0" :key="o.key"></w-tree>
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