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怎么在vue中實現無限層級多選菜單功能?針對這個問題,這篇文章詳細介紹了相對應的分析和解答,希望可以幫助更多想解決這個問題的小伙伴找到更簡單易行的方法。
<template> <div> <div > <span v-for="o in levelNum"> </span> <i v-if="item.list" :class="open ? openClass : closeClass" @click="showSub" ></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> </div> <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> </div> </template> <script> export default { name: 'wTree', props: ['item', 'level', 'state'], data () { return { open: true, node: 'wTree', // 控制菜單開關的 selected: false, // 選中的情況下 selectedState: 'null', // 子組件被選中的情況下向上傳遞all/sub/null originInfo: 'create', // 組件信息源,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.$emit('changeToPar', data) }, changeBySub (data) { // 如果是父組件true,判斷狀態,未被選中,添加id到list,selectSub=true,通知父組件,添加store的數組中,選中通知父組件,this.list.length=this.length狀態改為selected // 修改自身狀態,添加list let temp = data if (data.originInfo === 'create') { this.list.push(data) } else { this.originInfo = 'parent' let stateNull = 'null' let stateAll = 'all' let stateSub = 'sub' for (let o of this.list) { if (o.id === temp.id) { o.selectedState = temp.selectedState } if (o.selectedState !== 'all') { stateAll = null } if (o.selectedState !== 'null') { stateNull = null } } if (stateNull) { this.selectedState = stateNull this.selected = false } else if (stateAll) { this.selectedState = stateAll this.selected = true } else { this.selectedState = stateSub this.selected = true } let data = { id: this.item.menuId, selectedState: this.selectedState, originInfo: 'parent' } this.$emit('changeToPar', data) } } }, watch: { selected () { // 初始化 if (this.originInfo === 'create') { // 不改變值 } else { // 改變值******** if (this.selected) { // 添加值 this.$store.commit('PUSH_CHECK_LIST', this.item.menuId) } else { // 刪除值 this.$store.commit('SPLICE_CHECK_LIST', this.item.menuId) } } }, state () { // 子組件得到通知,如果狀態一直,不去改變,如果狀態不一致改變 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 () { // 初始化數組 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.$emit('changeToPar', data) } } }, created () { // 初始化,把每個組件,從最底層添加到節點列表中,這樣每個子組件都在list中了,就是originInfo=create的情況下添加數組,就不用判斷數組長度,直接改變狀態 if (this.createSwitch) { let i = this.$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>
調用 orgList帶有層級的json數組
<w-tree v-for="o of orgList" :item="o" :level="0" :key="o.key"></w-tree>
Vue具體輕量級框架、簡單易學、雙向數據綁定、組件化、數據和結構的分離、虛擬DOM、運行速度快等優勢,Vue中頁面使用的是局部刷新,不用每次跳轉頁面都要請求所有數據和dom,可以大大提升訪問速度和用戶體驗。
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