vue 一个简单的项目之二城市选择页面 step6 兄弟组件数据传递

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我是靠谱客的博主激动唇膏，最近开发中收集的这篇文章主要介绍vue 一个简单的项目之二城市选择页面 step6 兄弟组件数据传递，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

前面我们动态地获取了城市选择页面的数据。下面，我们希望，点击字母表，左边列表能自动滑到相应字母部分。这需要兄弟组件间传递数据啦。

首先，创建一个分支 city-components ，pull 下来，在这个分支实现兄弟组件通信。

好啦，首先，我们打开，Alphabet.vue 代码，给每一 li 一个click 事件。

然后我们把数据从 Alphabet 传递给父组件 City，再由City 转发给List 组件。

Alphabet.vue 代码如下

<template>
<ul class="list">
<li
class="item"
v-for="(item,key) of cities"
:key="key"
@click="handleLetterClick"
>
{{key}}
</li>
</ul>
</template>
<script>
export default {
name: 'CityAlphabet',
props: {
cities: Object
},
methods: {
handleLetterClick (e) {
this.emit('change',e.target.innerText)
}
}
}
</script>
<style lang="stylus" scoped>
@import '~styles/variables.styl'
.list
display: flex
flex-direction: column
justify-content: center
position: absolute
top: 1.5rem
right: 0
bottom: 0
width: .4rem
.item
line-height: .4rem
text-align: center
color: $bgColor
</style>

City.vue 代码如下

<template>
<div>
<city-header></city-header>
<city-search></city-search>
<city-list
:cities="cities"
:hot="hotCities"
:letter="letter"
></city-list>
<city-alphabet
:cities="cities"
@change="handleLetterChange"
></city-alphabet>
</div>
</template>
<script>
import axios from 'axios'
import CityHeader from './components/Header.vue'
import CitySearch from './components/Search.vue'
import CityList from './components/List.vue'
import CityAlphabet from './components/Alphabet.vue'
export default {
name: 'City',
components: {
CityHeader,
CitySearch,
CityList,
CityAlphabet
},
data () {
return {
cities: {},
hotCities: [],
letter: ''
}
},
methods: {
getCityInfo () {
axios.get('/api/city.json')
.then(this.handleGetCityInfoSucc)
},
handleGetCityInfoSucc (res) {
res = res.data
if (res.ret && res.data) {
const data = res.data
this.cities = data.cities
this.hotCities = data.hotCities
}
},
handleLetterChange (letter) {
this.letter = letter
}
},
mounted () {
this.getCityInfo()
}
}
</script>
<style lang="stylus" scoped>
</style>

然后在List.vue 中接收父组件传递的数据。[better-scroll 还是挺好用的]

<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-wraper">
<div class="button">北京</div>
</div>
</div>
</div>
<div class="area">
<div class="title border-topbottom">热门城市</div>
<div class="button-list">
<div class="button-wraper" v-for="item of hot" :key="item.id">
<div class="button">{{item.name}}</div>
</div>
</div>
</div>
<div
class="area"
v-for="(item,key) of cities"
:key="key"
:ref="key"
>
<div class="title border-topbottom">{{key}}</div>
<div class="item-list">
<div
class="item border-bottom"
v-for="innerItem of item"
:key="innerItem.id"
>
{{innerItem.name}}
</div>
</div>
</div>
</div>
</div>
</template>
<script>
import Bscroll from 'better-scroll'
export default {
name: 'CityList',
props: {
cities: Object,
hot: Array,
letter: String
},
mounted () {
this.scroll = new Bscroll(this.$refs.wrapper)
},
watch: {
letter () {
if (this.letter) {
const element = this.$refs[this.letter][0]
this.scroll.scrollToElement(element)
}
}
}
}
</script>

接下来，我们要做一个右侧字母表拖拽时，左边也会滑动的效果。

改一下Alphabet.vue 给它增加滚动事件的监听。

<template>
<ul class="list">
<li
class="item"
v-for="item of letters"
:key="item"
:ref="item"
@touchstart="handleTouchStart"
@touchmove="handleTouchMove"
@touchend="handleTouchEnd"
@click="handleLetterClick"
>
{{item}}
</li>
</ul>
</template>
<script>
export default {
name: 'CityAlphabet',
props: {
cities: Object
},
data () {
return {
touchStatus: false
}
},
computed: {
letters () {
const letters = []
for (let i in this.cities) {
letters.push(i)
}
return letters
}
},
methods: {
handleLetterClick (e) {
this.$emit('change', e.target.innerText)
},
handleTouchStart () {
this.touchStatus = true
},
handleTouchMove (e) {
if (this.touchStatus) {
const startY = this.$refs['A'][0].offsetTop
const touchY = e.touches[0].clientY - 79
const index = Math.floor((touchY - startY) / 20)
if (index >= 0 && index < this.letters.length) {
this.$emit('change', this.letters[index])
}
}
},
handleTouchEnd () {
this.touchStatus = false
}
}
}
</script>
<style lang="stylus" scoped>
@import '~styles/variables.styl'
.list
display: flex
flex-direction: column
justify-content: center
position: absolute
top: 1.5rem
right: 0
bottom: 0
width: .4rem
.item
line-height: .4rem
text-align: center
color: $bgColor
</style>

Done!