在做移动端商城或者其他页面的时候,经常会遇到左右联动的效果 vue2.0和better-scroll这个插件
一起实现左右联动效果。
左边一级分类和右边二级分类形成联动
当滑动右侧分类列表时, 更新左侧分类选中
点击左侧一级分类项时, 右侧列表滑动到对应位置
在vue脚手架的时候,引入第三方插件better-scroll,如果想了解的话,可以去看看它的中午文档说明,
npm install better-scroll --save直接安装到自己项目当中,并引入
<div class="search">
<SearchNav>SearchNav>
<div class="shop">
<div class="menu-wrapper">
<ul>
<li
class="menu-item"
v-for="(goods,index) in searchgoods"
:key="index"
:class="{current: index === currentIndex}"
@click="clickList(index)"
ref="menuList"
>
<span>{{goods.name}}span>
li>
ul>
div>
<div class="shop-wrapper">
<ul ref="itemList">
<li class="shops-li" v-for="(goods, index1) in searchgoods" :key="index1">
<div class="shops-title">
<h4>{{goods.name}}h4>
<a href="">查看更多 > a>
div>
<ul class="phone-type" v-if="goods.tag === 'phone'">
<li v-for="(phone,index) in goods.category" :key="index">
<img :src="phone.icon" alt="">
li>
ul>
<ul class="shops-items">
<li v-for="(item, index2) in goods.items" :key="index2">
<img :src="item.icon" alt="">
<span>{{item.title}}span>
li>
ul>
li>
ul>
div>
div>
div>
先实现左右两边滚动效果,我们需要在methods定义一个方法,但是better-scroll的初始化一定要在数据渲染完成后进行
1
methods:{
_initBScroll(){
//左边滚动
this.leftBscroll = new BScroll('.menu-wrapper',{});
//右边滚动
this.rightBscroll = new BScroll('.shop-wrapper',{
probeType:3 //在滚动中触发scroll 事件
});
}
}
我们通过watch监听searchgoods数据是否有,并通过this.$nextTick去调用_initBScroll方法。
searchgoods是数据存储的地方
watch:{
searchgoods(){
//监听数据
this.$nextTick(() =>{
//左右两边滚动
this. _initBScroll();
//右边列表高度
this._initRightHeight()
})
}
},
1.需要在data中定义两个变量
data () {
return {
scrollY:0, //右侧列表滑动的y轴坐标
rightLiTops:[] //所有分类头部位置
}
},
2.在methods中定义一个方法,_initRightHeight,这个方法是用于计算每个li标签的高度
//求出右边列表的高度
_initRightHeight(){
let itemArray=[]; //定义一个伪数组
let top = 0;
itemArray.push(top)
//获取右边所有li的礼
let allList = this.$refs.itemList.getElementsByClassName('shops-li');
//allList伪数组转化成真数组
Array.prototype.slice.call(allList).forEach(li => {
top += li.clientHeight; //获取所有li的每一个高度
itemArray.push(top)
});
this.rightLiTops = itemArray;
// console.log(this.rightLiTops)
},
通过better-scroll提供的 on 事件,当右边内容滚动的时候计算出滚动的距离,一定要在滚动的时候触发这个事件_initBScroll这个方法当中去写
//监听右边滚动事件
this.rightBscroll.on('scroll',(pos) => {
this.scrollY = Math.abs(pos.y);
console.log(this.scrollY)
})
1需要给左右的li标签绑定一个:class="{current: index === currentIndex}",通过计算属性,实现这个效果
computed: {
//动态绑定class类名 左边跟随右边高亮的效果
currentIndex(index) {
const {scrollY,rightLiTops} = this;
return rightLiTops.findIndex((tops,index )=>{
this._initLeftScroll(index); //调用左右联调滚动效果
return scrollY >= tops && scrollY < rightLiTops[index + 1]
})
}
},
5.1实现点击左边实现滚动效果,需要给左边的li标签绑定一个点击事件@click="clickList(index)"
,通过index来来计算出点击的位置
this.rightLiTops[index]
通过index索引得到点击的时候,会得到每一块li标签的高度
通过better-scroll提供的scrollTo来实现具体滚动的位置
clickList(index){
this.scrollY = this.rightLiTops[index];
this.rightBscroll.scrollTo(0,-this.scrollY,200,)
},
5.2当右边内容滚动的时候,滚动一定的程度的时候,希望左边也会随着滚动,
5.2.1通过ref所有所有li标签
let menu = this.$refs.menuList;
5.2.2得到他们每一个索引值
let el = menu[index];
5.2.3通过scrollToElement实现滚动目标元素位置
//左右联调
_initLeftScroll(index){
let menu = this.$refs.menuList;
let el = menu[index];
this.leftBscroll.scrollToElement(el,300,0,-300)
}
最终代码
<template>
<div class="search">
<SearchNav>SearchNav>
<div class="shop">
<div class="menu-wrapper">
<ul>
<li
class="menu-item"
v-for="(goods,index) in searchgoods"
:key="index"
:class="{current: index === currentIndex}"
@click="clickList(index)"
ref="menuList"
>
<span>{{goods.name}}span>
li>
ul>
div>
<div class="shop-wrapper">
<ul ref="itemList">
<li class="shops-li" v-for="(goods, index1) in searchgoods" :key="index1">
<div class="shops-title">
<h4>{{goods.name}}h4>
<a href="">查看更多 > a>
div>
<ul class="phone-type" v-if="goods.tag === 'phone'">
<li v-for="(phone,index) in goods.category" :key="index">
<img :src="phone.icon" alt="">
li>
ul>
<ul class="shops-items">
<li v-for="(item, index2) in goods.items" :key="index2">
<img :src="item.icon" alt="">
<span>{{item.title}}span>
li>
ul>
li>
ul>
div>
div>
div>
template>
<script>
import SearchNav from './Children/SearchNav'
import {mapState} from 'vuex'
import BScroll from 'better-scroll'
export default {
name: 'chat',
data () {
return {
scrollY: 0, //右侧列表滑动的y轴坐标
rightLiTops:[] //所有分类头部位置
}
},
computed: {
...mapState(['searchgoods']), //列表数据
//动态绑定class类名
currentIndex(index) {
const {scrollY,rightLiTops} = this;
return rightLiTops.findIndex((tops,index )=>{
this._initLeftScroll(index);
return scrollY >= tops && scrollY < rightLiTops[index + 1]
})
}
},
mounted() {
this.$store.dispatch('reqSearchGoods')
},
components: {
SearchNav
},
watch:{
searchgoods(){
//监听数据
this.$nextTick(() =>{
//左右两边滚动
this. _initBScroll();
//右边列表高度
this._initRightHeight()
})
}
},
methods:{
_initBScroll() {
//左边滚动
this.leftBscroll = new BScroll('.menu-wrapper',{});
//右边滚动
this.rightBscroll = new BScroll('.shop-wrapper',{
probeType:3
});
//监听右边滚动事件
this.rightBscroll.on('scroll',(pos) => {
this.scrollY = Math.abs(pos.y);
// console.log(this.scrollY)
})
},
//求出右边列表的高度
_initRightHeight(){
let itemArray=[]; //定义一个伪数组
let top = 0;
itemArray.push(top)
//获取右边所有li的礼
let allList = this.$refs.itemList.getElementsByClassName('shops-li');
//allList伪数组转化成真数组
Array.prototype.slice.call(allList).forEach(li => {
top += li.clientHeight; //获取所有li的每一个高度
itemArray.push(top)
});
this.rightLiTops = itemArray;
// console.log(this.rightLiTops)
},
//点击左边实现滚动
clickList(index){
this.scrollY = this.rightLiTops[index];
console.log(this.scrollY)
this.rightBscroll.scrollTo(0,-this.scrollY,200,)
},
//左右联调
_initLeftScroll(index){
let menu = this.$refs.menuList;
let el = menu[index];
this.leftBscroll.scrollToElement(el,300,0,-300)
}
}
}
script>
<style lang="stylus" rel="stylesheet/stylus" scoped>
@import "../../common/stylus/mixins.styl"
.search
width 100%
height 100%
background-color #f5f5f5
overflow hidden
.shop
display flex
position absolute
top 60px
bottom 50px
width 100%
overflow hidden
.menu-wrapper
background-color #e0e0e0
width 80px
flex 0 0 80px
.menu-item
width 100%
height 60px
background #fafafa
display flex
justify-content center
align-items center
font-family lighter
color #666
position relative
.current
color #e02e24
background #ffffff
.current::before
content ''
background-color #e02e24
width 4px
height 30px
position absolute
left 0
.shop-wrapper
flex 1
background #fff
.shops-title
display flex
flex-direction row
padding 0 10px
height 40px
align-items center
justify-content space-between
color #9999
a
text-decoration none
color #9c9c9c
font-size 14px
.shops-items
display flex
flex-wrap wrap
li
display flex
flex-direction column
width 33.3%
height 90px
justify-content center
align-items center
img
width 60%
height 60%
margin-bottom 5px
span
color #151516
font-size 13px
.phone-type
width 100%
display flex
flex-direction row
flex-wrap wrap
border-bottom-1px (#cccccc)
li
width 33.3%
display flex
justify-content center
align-items center
margin 5px 0
img
width 70%
style>