vue实现城市列表选择功能

成果展示

最后的成果就是下面所展示的内容，因为gif图没有做，只能截图所展示，接下来，会带着大家一步一步的完成下面功能，脚手架搭建和node安装在本次案例不会讲解，如果了解，可以在我的博客园找到有详细介绍

准备工作：

　引入axios插件，调用better-scroll第三方插件，本地json文件，可以参考目录中的city.json,有条件的也可以自己去扒

功能分析

1.获取json数据展示城市列表 。

2.侧边字母定位滚动到相应的位置。

3.实现搜索城市

接下来我们开始对组件进行划分：本次案例中，总共划分为五个组件，下面就是组件的划分图

创建city组件，通过父组件获取数据，传递给子组件

<template>
 <div class="city">
  <cityheader></cityheader> //头部
  <search :list="cities"></search> //搜索
  <list :hot="hotcity" :letter="letter" :list="cities"></list> //城市列表
  <alphabet @chang="handleletterchang" :list="cities"></alphabet> //a-z
 </div>
</template>
<script>
import axios from 'axios'
import cityheader from './components/header'
import search from './components/search'
import list from './components/list'
import alphabet from './components/alphabet'
export default {
 data () {
  return {
   cities:{}, // 城市列表
   hotcity:[], //热门城市
   letter: '' // a-z
  }
 },
 components: {
  cityheader,
  search,
  list,
  alphabet
 },
 methods:{
  getcityinfo () {
   axios.get('/api/city.json').then(this.getcityinfosucc)
  },
  getcityinfosucc(res){
    res = res.data
   if (res.ret && res.data) {
    const data = res.data
    this.hotcity = data.hotcities
    this.cities = data.cities
   }
   console.log(this.cities)
  },
  handleletterchang(letter) { //接受子组件传过来的
//   console.log(letter)
   this.letter = letter
  }
 },
 mounted () {
  this.getcityinfo ()
 }
}
</script>
<style scoped lang="stylus">
</style>

把得到的数据分次传递个对应的子组件，这样有利于网站优化，不用频繁的请数据

<template>
 <div class="city">
  <cityheader></cityheader>
  <search :list="cities"></search>
  <list :hot="hotcity" :letter="letter" :list="cities"></list>
  <alphabet @chang="handleletterchang" :list="cities"></alphabet>
 </div>
</template>
export default {
 data () {
  return {
   cities:{}, // 城市列表
   hotcity:[], //热门城市
   letter: '' // a-z
  }
 },
 components: {
  cityheader,
  search,
  list,
  alphabet
 },
 methods:{
  getcityinfo () {
   axios.get('/api/city.json').then(this.getcityinfosucc) //请求本地配置的mock数据
  },
  getcityinfosucc(res){
    res = res.data
   if (res.ret && res.data) {
    const data = res.data
    this.hotcity = data.hotcities
    this.cities = data.cities
   }
  }
 },
 mounted () {
  this.getcityinfo ()
 }
}

创建头部组件，

<template>
 <div class="header">
  城市选择
  <router-link to="/">
   <div class="iconfont back-icon"></div>
  </router-link>
 </div>
</template>
<script>
export default {
}
</script>
<style scoped lang="stylus">
@import '~styles/varibles.styl';
@import '~styles/mixins.styl';
.header
 overflow: hidden
 height $headerheight
 line-height: $headerheight
 text-align: center
 color: #fff
 background: $bgcolor
 font-size: .4rem
 .back-icon
  position: absolute
  left: 0
  top: 0
  width: .64rem
  font-size: .4rem
  text-align: center
  color: #fff
</style>

创建搜索组件页面，接受父组件传递的数据，引入better-scroll第三方插件，实现列表滚动

<template>
 <div>
  <div class="search">
   <input v-model="keyword" class="search-input" type="text" placeholder="输入城市名或者拼音" />
  </div>
  <div class="search-content" ref="search" v-show="keyword">
   <ul>
    <li class="serach-item border-bottom" v-for="item in listitem" :key="item.id">{{item.name}}</li>
    <li v-show="hasnodata" class="serach-item border-bottom">没有搜索到匹配的数据</li>
   </ul>
  </div>
 </div>
</template>
<script>
import bscroll from 'better-scroll'
export default {
 props: {
   list: object,
 },
 data() {
  return {
   keyword:'',
   listitem:[],
   timer:null
  }
 },
 computed: {
  hasnodata() {
   return !this.listitem.length //没有搜索的条件是否显示
  }
 },
 watch: {
  keyword () {
   if (this.timer) {
    cleartimeout(this.timer)
   }
   if(!this.keyword) { //清空
    this.listitem = ""
    return
   }
   this.timer = settimeout(() => {
    const result = []
    for (let i in this.list) {
     this.list[i].foreach((value) => { //匹配搜索的条件
      if (value.spell.indexof(this.keyword) > -1 || value.name.indexof(this.keyword) > -1) {
       result.push(value)
      }
     })
    }
    this.listitem= result
   },100)
  }
 },
 mounted () {
  this.scroll = new bscroll(this.$refs.search)
 }
}
</script>
<style scoped lang="stylus">
@import '~styles/varibles.styl'
@import '~styles/mixins.styl'
.search
 height: .72rem
 padding: 0 .1rem
 background:$bgcolor
 .search-input
  box-sizing: border-box
  width:100%
  height: .62rem
  line-height: .62rem
  text-align: center
  border-radius: .06rem
  padding: 0 .1rem
  color: #666
.search-content 
 z-index: 1
 overflow:hidden
 position:absolute
 top: 1.58rem
 left: 0
 right: 0
 bottom: 0
 background: #eee
 .serach-item
  line-height: .62rem
  padding-left:.2rem
  color:#666
  background: #fff
</style>

创建城市列表组件，引入better-scroll插件，实现列表滚动，通过watch监听letter，实现字母与城市列表滚动

<template>
 <div class="list" ref="wrapper">
  <div>
   <div class="area">
    <div class="title border-topbottom">当前城市</div>
    <div class="button-list">
     <div class="button-wrapper">
      <div class="button">郑州</div>
     </div>
    </div>
   </div>
   <div class="area">
    <div class="title border-topbottom">热门城市</div>
    <div class="button-list">
     <div class="button-wrapper" v-for="item in hot" :key="item.id">
      <div class="button">{{item.name}}</div>
     </div>
    </div>
   </div>
   <div class="area" 
    v-for="(item,key) in list" 
    :ref="key"
    :key="key">
    <div class="title border-topbottom">{{key}}</div>
    <ul class="item-list">
     <li class="item border-bottom"
       v-for="listinner in item"
       :key="listinner.id"
     >{{listinner.name}}</li>
    </ul>
   </div>
  </div>
 </div>
</template>
<script>
import bscroll from 'better-scroll'
export default {
 props: {
   hot: array,
   list: object,
   letter:string
  },
 mounted () {
  this.scroll = new bscroll(this.$refs.wrapper)
 },
 watch:{
  letter () { //监听列表滚动事件 a-z
   if(this.letter) {
    const element = this.$refs[this.letter][0]
    this.scroll.scrolltoelement(element)
   }
  }
 }
}
</script>
<style scoped lang="stylus">
@import '~styles/varibles.styl';
@import '~styles/mixins.styl';
.border-topbottom
 &:before
  background: #ccc
 &:after
  background:#ccc
.border-bottom
 &:before
  background: #ccc
.list
 overflow: hidden
 position:absolute
 top:1.58rem
 left:0
 right:0
 bottom:0
 .title
  line-height: .54rem;
  background: #eee;
  padding-left: .2rem;
  color: #666;
  font-size: .26rem;
 .button-list
  overflow:hidden
  padding: .1rem .6rem .1rem .1rem
  .button-wrapper
   float:left
   width:33.33%
   .button
    margin: .1rem
    padding: .1rem 0
    text-align: center
    border: .02rem solid #ccc
    border-radius: .06rem
 .item-list
  .item
   line-height: .76rem
   color:#212121
   padding-left: .2rem
   font-size: .28rem
   text-overflow: ellipsis
   white-space: nowrap
</style>

创建字母组件，点击字母，左边列表城市想对应，通过this.$emit事件，子组件在触发的事件传递给父组件，父组件通过子组件传递的事件，在传递给list组件，

<template>
 <div class="list">
  <li class="item"
   :ref="item"
    @click="handeclick" 
    @touchstart="handletouchstart" 
    @touchmove="handletouchmove" 
    @touchend= "handletouchend"
    v-for="item of letter" 
    :key="item">{{item}}</li>
 </div>
</template>
<script>
export default {
 props: {
   list: object
 },
 data () {
  return {
   touchstart:false,
   starty:0,
   timer: null
  }
 },
 updated () {
  this.starty = this.$refs['a'][0].offsettop
 },
 computed: {
  letter () {
   const letter =[]
   for (let i in this.list) { //循环a-z
    letter.push(i)
   }
   return letter
  }
 },
 methods: {
  handeclick(e) {
   this.$emit('chang',e.target.innertext) //传给父组件city
  },
  handletouchstart () {
   // 手指放上
   this.touchstart = true
  },
  handletouchmove (e) {
   // 手指移动
   if(this.touchstart) {
    if(this.timer) {
     clearinterval(this.timer)
    }
    this.timer = settimeout(() => {
     const touchy = e.touches[0].clienty -79 //到蓝色头部的距离
     const index = math.floor((touchy - this.starty ) / 20)
     if(index >=0 && index < this.letter.length) {
      this.$emit('chang',this.letter[index])
     }
    },16)
   }
  },
  handletouchend () {
   // 手指离开
   this.touchstart = false
  }
 }
}
</script>
<style scoped lang="stylus">
@import '~styles/varibles.styl';
@import '~styles/mixins.styl';
.list
 display: flex
 flex-direction:column
 justify-content: center
 position:absolute
 top: 1.58rem
 right: 0
 bottom: 0
 width: .4rem
 .item
  line-height:.44rem
  text-align: center
  color: $bgcolor
  list-style:none
</style>

总结

以上所述是小编给大家介绍的vue实现城市列表选择功能，希望对大家有所帮助