vue.js2.0 实现better-scroll的滚动效果实例详解

什么是 better-scroll

better-scroll 是一个移动端滚动的解决方案，它是基于 iscroll 的重写，它和 iscroll 的主要区别在这里 。better-scroll 也很强大，不仅可以做普通的滚动列表，还可以做轮播图、picker 等等。

<template>
  <div>
    <div class="goods">
      <div class="menu-wrapper" ref="menuWrapper">
      </div>
      <div class="food-wrapper" ref="foodWrapper">
      </div>
    </div>
  </div>
</template>

与1.0版本不同的是,我们使用的是ref

<script type="text/ecmascript-6">
  import BScroll from "better-scroll";
  export default {
    data(){
  return {
  currentIndex:1,
  goods:[]
  }
 },
 created(){
  this.classMap=['decrease','discount','special','invoice','guarantee'];
  this.$http.get('/api/goods').then((response)=>{
  response=response.body;
  if (response.errno===ERR_OK) {
   this.goods=response.data;
  }
        //dom结构加载结束(nextTick这个接口是计算dom相关的,要确保原生dom已经渲染了)
  this.$nextTick(()=>{
   this._initScroll();
  });
  });
 },
 methods:{
  _initScroll(){
        // 使用better-scroll实现的关键代码
  this.menuScroll=new BScroll(this.$refs.menuWrapper,{click:true});
  this.foodScroll=new BScroll(this.$refs.foodWrapper,{click:true});
  }
 }
  };
</script>

很简单这样页面就可以滚动了,如下图

但是,这样左右两个页面并没有联动起来,需要我们再定义一个方法来计算滚动的高度,以及在计算属性中计算左侧当前索引在哪里

从而定义左侧边栏的位置

 computed:{
  //用来计算左侧当前索引在哪，从而定位到左侧边栏的位置
  currentIndex(){
  for (let i = 0; i < this.listHeight.length; i++) {
   var height1=this.listHeight[i] ;
   var height2=this.listHeight[i+1];
   if(!height2||(this.scrollY >= height1 && this.scrollY < height2)){
   return i;
   }
  }
  return 0;
  }
 },
 methods:{
  _initScroll(){
  // 使用better-scroll实现的关键代码
  this.menuScroll=new BScroll(this.$refs.menuWrapper,{click:true});
  this.foodScroll=new BScroll(this.$refs.foodWrapper,{
   click: true,
          //探针作用，实时监测滚动位置
          probeType: 3
  });
  this.foodScroll.on('scroll',(pos)=>{
   this.scrollY=Math.abs(Math.round(pos.y))
  });
  },
  _calculateHeight(){
  let foodList=this.$refs.foodWrapper.getElementsByClassName('food-list-hook');
  let height=0;
  this.listHeight.push(height);
  for (var i = 0; i < foodList.length; i++) {
   let item=foodList[i];
   height+=item.clientHeight;
   this.listHeight.push(height);
  }
  }
 }
//dom结构加载结束(nextTick这个接口是计算dom相关的,要确保原生dom已经渲染了)
         this.$nextTick(()=>{
           this._initScroll();
           this._calculateHeight();
         });

在dom渲染后,也是需要计算高度的.

滑动右边,实现左边联动已经实现了,接下来就是,点击左边的菜单,右边的食物相应滚动到具体的位置

给左边菜单绑定一个事件:@click="selectMenu(index,$event)"

/左边的菜单项的点击事件
selectMenu(index,event){
//自己默认派发事件时(BScroll),_constructed默认为true.但原生的浏览器并没有这个属性
 if (!event._constructed) {
   return;
 }
 //运用BScroll滚动到相应位置
 //运用index去找到对应的右侧位置
 let foodList=this.$refs.foodWrapper.getElementsByClassName('food-list-hook');
 //滚动到相应的位置
 let el=foodList[index];
 //设置滚动时间
 this.foodScroll.scrollToElement(el,2000);
}

至此,整个联动实现的,完整代码如下

<template>
 <div>
 <div class="goods">
  <div class="menu-wrapper" ref="menuWrapper">
  <ul>
   <li v-for="(item,index) in goods" class="menu-item" :class="{'current':currentIndex===index}" @click="selectMenu(index,$event)">
   <span class="text border-1px">
    <span v-show="item.type>0" class="icon" :class="classMap[item.type]"></span>{{item.name}}
   </span>
   </li>
  </ul>
  </div>
  <div class="food-wrapper" ref="foodWrapper">
  <ul>
   <li v-for="(item,index) in goods" class="food-list food-list-hook">
   <h1 class="title">{{item.name}}</h1>
   <ul>
    <li v-for="food in item.foods" class="food-item border-1px">
    <div class="icon">
     <img :src="food.icon" width="57" height="57" alt="">
    </div>
    <div class="content">
     <h2 class="name">{{food.name}}</h2>
     <p class="desc">{{food.description}}</p>
     <div class="extra">
     <span class="count">月售{{food.sellCount}}份</span>
     <span>好评率{{food.rating}}%</span>
     </div>
     <div class="price">
     <span class="now">¥{{food.price}}</span><span class="old" v-show="food.oldPrice">¥{{food.oldPrice}}</span>
     </div>
    </div>
    </li>
   </ul>
   </li>
  </ul>
  </div>
 </div>
 </div>
</template>
<script type="text/ecmascript-6">
 import BScroll from "better-scroll";
 const ERR_OK=0;
 export default {
 props:{
  seller:{
  type:Object
  }
 },
 data(){
  return {
  goods:[],
  listHeight:[],
  scrollY:0
  }
 },
 created(){
  this.classMap=['decrease','discount','special','invoice','guarantee'];
  this.$http.get('/api/goods').then((response)=>{
  response=response.body;
  if (response.errno===ERR_OK) {
   this.goods=response.data;
  }
  //dom结构加载结束(nextTick这个接口是计算dom相关的,要确保原生dom已经渲染了)
  this.$nextTick(()=>{
   this._initScroll();
   this._calculateHeight();
  });
  });
 },
 computed:{
  //用来计算左侧当前索引在哪，从而定位到左侧边栏的位置
  currentIndex(){
  for (let i = 0; i < this.listHeight.length; i++) {
   var height1=this.listHeight[i] ;
   var height2=this.listHeight[i+1];
   if(!height2||(this.scrollY >= height1 && this.scrollY < height2)){
   return i;
   }
  }
  return 0;
  }
 },
 methods:{
  _initScroll(){
  // 使用better-scroll实现的关键代码
  this.menuScroll=new BScroll(this.$refs.menuWrapper,{click:true});
  this.foodScroll=new BScroll(this.$refs.foodWrapper,{
   click: true,
          //探针作用，实时监测滚动位置
          probeType: 3
  });
  this.foodScroll.on('scroll',(pos)=>{
   this.scrollY=Math.abs(Math.round(pos.y))
  });
  },
  _calculateHeight(){
  let foodList=this.$refs.foodWrapper.getElementsByClassName('food-list-hook');
  let height=0;
  this.listHeight.push(height);
  for (var i = 0; i < foodList.length; i++) {
   let item=foodList[i];
   height+=item.clientHeight;
   this.listHeight.push(height);
  }
  },
  //左边的菜单项的点击事件
  selectMenu(index,event){
  //自己默认派发事件时(BScroll),_constructed默认为true.但原生的浏览器并没有这个属性
  if (!event._constructed) {
   return;
  }
  //运用BScroll滚动到相应位置
  //运用index去找到对应的右侧位置
  let foodList=this.$refs.foodWrapper.getElementsByClassName('food-list-hook');
  //滚动到相应的位置
  let el=foodList[index];
  //设置滚动时间
  this.foodScroll.scrollToElement(el,2000);
  }
 }
 };
</script>
<style lang="stylus" rel="stylesheet/stylus">
 @import "../../common/stylus/mixin.styl";

 .goods
 display:flex
 position:absolute
 top:174px
 bottom:46px
 width:100%
 overflow:hidden
 .menu-wrapper
  flex:0 0 80px
  width: 80px
  background:#f3f5f7
  .menu-item
  display:table
  height:54px
  width:56px
  padding:0 12px
  line-height:14px
  &.current
   position:relative
   z-index:10
   margin-top:-1px
   background:#fff
   font-weight:700
   .text
   border-none()
  .icon
   display:inline-block
   vertical-align:top
   margin-right:2px
   width:12px
   height:12px
   background-size:12px 12px
   background-repeat:no-repeat
   &.decrease
   bg-image('decrease_3')
   &.discount
   bg-image('discount_3')
   &.guarantee
   bg-image('guarantee_3')
   &.invoice
   bg-image('invoice_3')
   &.special
   bg-image('special_3')
  .text
   display:table-cell
   vertical-align:middle
   width:56px
   border-1px(rgba(7,17,27,0.1))
   font-size:12px
 .food-wrapper
  flex:1
  .title
  padding-left:14px
  font-size:12px
  color:rgb(147,153,159)
  height:26px
  border-left:2px solid #d9dde1
  line-height:26px
  background:#f3f5f7
  .food-item
  display:flex
  margin:18px
  padding-bottom:18px
  border-1px(rgba(7,17,27,0.1))
  &:last-child
   border-none()
   margin-bottom:0
  .icon
   flex:0 0 57px
   margin-right:10px
  .content
   flex:1
   .name
   margin:2px 0 8px 0
   height:14px
   line-height:14px
   font-size:14px
   color:rgb(7,17,27)
   .desc,.extra
   line-height:10px
   font-size:10px
   color:rgb(147,153,159)
   .desc
   margin-bottom:8px
   line-height:12px
   .extra
   .count
    margin-right:12px
   .price
   font-weight:700
   line-height:24px
   .now
    margin-right:8px
    font-size:14px
    color:rgb(240,20,20)
   .old
    text-decoration:line-through
    font-size:10px
    color:rgb(147,153,159)
</style>

总结

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