vue实现城市列表选择功能

时间:2020-05-16 小周sri的码农人气:0

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，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！

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