本文实例为大家分享了vue仿写下拉菜单功能，带有过渡效果(移动端)，供大家参考，具体内容如下

效果图

clickOutside.js 点击目标之外的地方,下拉框隐藏

代码如下:

export const clickOutside = { bind(el, binding, vnode) { function documentHandler(e) { if (el.contains(e.target)) { return false; } if (binding.expression) { binding.value(e); } } el.__vueClickOutside__ = documentHandler; document.addEventListener("click", documentHandler); }, update() {}, unbind(el, binding) { document.removeEventListener("click", el.__vueClickOutside__); delete el.__vueClickOutside__; }};

正文html如下:

<div class="info-select"> <div class="select"> <p class="select-p" @click="showSelectUl('s1')" v-clickOutside="hideSelectUl"> <span>{{issues}}</span> <img :src="require('../../assets/images/support/icon_xiala.png')" alt=""> </p> <transition name="slide-fade"> <div class="select-ul" v-show="!showIssues" > <div v-for="(item, index) in list" :key="index" > <div>{{item.class}}</div> <div v-for="(item1, i) in item.node" :key="i" @click="getSize('s1', item1.class, index, i)"> <p :class="{active:item == issues}">{{item1.class}}</p> </div> </div> </div> </transition> <transition leave-active-class="slideOutRight" enter-active-class="slideInRight"> <p class="animated errP" style="position: absolute;margin:0.2rem 0 0 -3%;" v-show="form.issueErr" >{{form.issueMsg}}</p> </transition> </div> <div class="select"> <p class="select-p" @click="showSelectUl('s2')" v-clickOutside="hideSelectUl2"> <span>{{issues2}}</span> <img :src="require('../../assets/images/support/icon_xiala.png')" alt=""> </p> <transition name="component-fade" mode="out-in"> <div class="select-ul" v-show="!showIssues2"> <p v-for="(item, index) in childList" :class="{active:item == issues2}" :key="index" @click="getSize('s2', item.class, index)">{{item.class}}</p> </div> </transition> <transition leave-active-class="slideOutUp" enter-active-class="slideInUp"> <p class="animated errP" style="position:absolute;margin:0.2rem 0 0 -3%;" v-if="form.issueErr1" >{{form.issueMsg1}}</p> </transition> </div> </div> <div class="p-bts clearafter"> <button @click="form.issueErr = !form.issueErr">p1</button> <button @click="form.issueErr1 = !form.issueErr1">p2</button> </div>

js 代码如下:

import { clickOutside } from 'Models/clickoutside.js';export default { data(){ return{ catogery:'flight', issues:"Select Category", issues2:"Select Issue", showIssues:true, showIssues2:true, list:[ {id:0,class:'flight',node:[ {class:'1.1 a1111111111111 11111111111111',node:[ {class:'问题a1?'}, {class:'问题a2?'} ]}, {class:'1.2 a2',node:[ {class:'问题a3?'}, {class:'问题a4?'} ]}, ]}, {id:1,class:'hotel',node:[ {class:'1.1 b1',node:[ {class:'问题b1?'}, {class:'问题b2?'} ]}, {class:'1.2 b2',node:[ {class:'问题b3?'}, {class:'问题b4?'} ]}, ]}, ], childList:[], form:{ issueMsg:"Please select a category",issueErr:true, issueMsg1:"Please select a issue",issueErr1:true, }, } }, methods: { hideSelectUl(){ this.showIssues = true; }, hideSelectUl2(){ this.showIssues2 = true; }, showSelectUl(s){ if(s == 's1'){ this.showIssues = !this.showIssues; this.showIssues2 = true; }else{ this.showIssues = true; this.showIssues2 = !this.showIssues2; } }, getSize(s, val, index, index2){ if(s == 's1'){ this.issues = val; this.showIssues = true; this.catogery = this.list[index].class; this.childList = this.list[index].node[index2].node; this.issues2 = 'Select Issue'; }else if(s == 's2'){ this.issues2 = val; this.showIssues2 = true; } }, }, directives:{ clickOutside, }}

css代码如下:

.info-select{ display: flex; justify-content: space-between; .select{ width:40%; position: relative; padding:0.1rem 3% 0.1rem; vertical-align: top; font-size: 0.15rem; border-radius:2px; background: #fff; border-top:1px solid #ddd; border-bottom:1px solid #ddd; border-right:1px solid #ddd; } .select:last-child{ border-right:0; border-top:1px solid #ddd; border-bottom:1px solid #ddd; border-left:1px solid #ddd; } .select-p{ position: relative; height:0.21rem; line-height:0.21rem; span{ font-size: 0.16rem; display: inline-block; width:90%; overflow:hidden; white-space:nowrap; text-overflow:ellipsis; } img{ display:block; width:0.12rem; position: absolute; right: 0; top: 0; vertical-align: middle; } } .select-ul{ width:93.5%; padding:0.12rem 3%; position: absolute; top: 0.42rem; left: 0; z-index: 12; background: #fff; border:1px solid #eee; p{ padding:0.1rem 0 0.1rem 0.1rem; overflow:hidden; white-space:nowrap; text-overflow:ellipsis; } p:hover{ background: #eee; } p.active{ background: #eee; } } .errP{ color:#f00; } } .p-bts{ margin-top: 0.4rem; zoom: 1;// zoom(IE转有属性)可解决ie6,ie7浮动问题 button{ width:1.5rem; height:0.4rem; background: #ffa000; float: left; color:#fff; font-size:0.25rem; border-radius:2px; } button:last-child{ float: right; } } .component-fade-enter-active, .component-fade-leave-active { transition: opacity .3s ease; } .component-fade-enter, .component-fade-leave-to { opacity: 0; } // css animate .slide-fade-enter-active{ transition:all .2s ease-in; } .slide-fade-leave-active { transition: all .2s cubic-bezier(1.0, 0.5, 0.8, 1.0); } .slide-fade-enter, .slide-fade-leave-to{ transform: translateY(20px); opacity: 0; } // bounce .bounce-enter-active { animation: bounce-in .2s; } .bounce-leave-active { animation: bounce-in .1s reverse; } @keyframes bounce-in { 0% { transform: scale(0); } 50% { transform: scale(1); } 100% { transform: scale(1); } }

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