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vue和better-scroll實(shí)現(xiàn)列表左右聯(lián)動(dòng)效果詳解

更新時(shí)間：2019年04月29日 14:10:59 作者：guxiansheng1991

這篇文章主要介紹了vue和better-scroll實(shí)現(xiàn)列表左右聯(lián)動(dòng)效果，文中通過(guò)示例代碼介紹的非常詳細(xì)，對(duì)大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價(jià)值，需要的朋友們下面隨著小編來(lái)一起學(xué)習(xí)學(xué)習(xí)吧

一.實(shí)現(xiàn)思路

(1)實(shí)現(xiàn)上是左右分別一個(gè)better-scroll列表
(2)利用計(jì)算右側(cè)列表每一個(gè)大區(qū)塊的高度來(lái)計(jì)算左側(cè)的位置

二.實(shí)現(xiàn)

1.實(shí)現(xiàn)左右兩個(gè)better-scroll

(1)dom結(jié)構(gòu)(better-scroll要求,會(huì)把最外層dom的第一個(gè)子元素作為要滾動(dòng)的區(qū)域)

左邊滾動(dòng)列表dom
 <div class="menu-wrapper" v-el:menu-wrapper>
   <ul>
    <li v-for="item 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>

右邊滾動(dòng)列表dom
<div class="food-wrapper" v-el:food-wrapper>
   <ul>
    <li v-for="item 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 width="57" height="57" :src="food.icon">
       </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>好評(píng)率{{food.rating}}%</span>
         <div class="price">
          <span class="now">¥{{food.price}}</span>
          <span class="old" v-show="food.oldPrice">¥{{food.oldPrice}}</span>
         </div>
        </div>
       </div>
      </li>
     </ul>
    </li>
   </ul>
  </div>

在數(shù)據(jù)請(qǐng)求完成后的$nextTick中初始化better-scroll,就能實(shí)現(xiàn)兩個(gè)列表分別能滾動(dòng),至于聯(lián)動(dòng),要后面自己做

_initScroll() {
    this.menuScroll = new BScroll(this.$els.menuWrapper,{
     click:true  //允許better-scroll列表上的點(diǎn)擊事件
    });
    this.foodsScroll = new BScroll(this.$els.foodWrapper,{
     probeType : 3  //讓better-scroll監(jiān)聽(tīng)scroll事件
    });
    this.foodsScroll.on('scroll',(pos) => {
     this.scrollY =Math.abs(Math.round(pos.y));
    })
   },

2.實(shí)現(xiàn)聯(lián)動(dòng)效果

(1)具體的聯(lián)動(dòng)實(shí)現(xiàn)思路

在渲染完成后($nextTick內(nèi)),初始化better-scroll,并在初始化函數(shù)內(nèi)添加右側(cè)列表的scroll監(jiān)聽(tīng)事件,并記錄scrollY值到,存入vue的data中
在渲染完成后($nextTick內(nèi)),計(jì)算右側(cè)列表的每一個(gè)大區(qū)塊的高度,并累加,存入數(shù)組listHeight
因?yàn)閟crollY值在滾動(dòng)中總是不斷變化的,所以在computed中計(jì)算出currentIndex,當(dāng)前滾動(dòng)區(qū)域是哪一個(gè)大區(qū)塊,也就是listHeight數(shù)組的下標(biāo)
在dom中根據(jù)currentIndex應(yīng)用左側(cè)列表被點(diǎn)中的樣式
在左側(cè)列表某一項(xiàng)被點(diǎn)中的時(shí)候,右側(cè)列表滑動(dòng)到某一個(gè)大塊區(qū)域,

//初始化better-scroll
_initScroll() {
    this.menuScroll = new BScroll(this.$els.menuWrapper,{
     click:true
    });
    this.foodsScroll = new BScroll(this.$els.foodWrapper,{
     probeType : 3
    });
    this.foodsScroll.on('scroll',(pos) => {
     this.scrollY =Math.abs(Math.round(pos.y));
    })
   },

_calculateHeight() {
    let foodList = this.$els.foodWrapper.getElementsByClassName("food-list-hook");
    let height = 0;
    this.listHeight.push(height);
    for(let i=0;i<foodList.length;i++) {
     let item = foodList[i];
     height += item.clientHeight;
     this.listHeight.push(height);
    }
   }

computed: {
   currentIndex() {
    for(let i=0;i< this.listHeight.length;i++) {
     let height1 = this.listHeight[i];
     let height2 = this.listHeight[i+1];
     if(!height2 || (this.scrollY >= height1 && this.scrollY < height2)){
      return i;
     }
    }
    return 0;
   }
  },

<div class="menu-wrapper" v-el:menu-wrapper>
   <ul>
    <!-- :class="{'current':currentIndex === $index}" 就是根據(jù)currentIndex應(yīng)用左側(cè)列表被點(diǎn)中的樣式 -->
    <li v-for="item 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>

//被點(diǎn)擊事件
//dom
<div class="menu-wrapper" v-el:menu-wrapper>
   <ul>
    <!-- @click="selectMenu($index,$event)" 就是點(diǎn)擊事件 -->
    <li v-for="item in goods" class="menu-item"
      :class="{'current':currentIndex === $index}"
      @click="selectMenu($index,$event)">
     <span class="text border-1px">
      <span v-show="item.type > 0" class="icon"
       :class="classMap[item.type]"></span>{{item.name}}
     </span>
    </li>
   </ul>
  </div>
//js  
selectMenu(index,event) {
    if(!event._constructed) {
     return ;
    }
    let foodList = this.$els.foodWrapper.getElementsByClassName("food-list-hook");
    let el = foodList[index];
    this.foodsScroll.scrollToElement(el,300);
   },

以上所述是小編給大家介紹的vue和better-scroll實(shí)現(xiàn)列表左右聯(lián)動(dòng)效果詳解整合，希望對(duì)大家有所幫助，如果大家有任何疑問(wèn)請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)腳本之家網(wǎng)站的支持！

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