VUE 笔记 ilovecoding 207 详情页-滚动内容显示对应标题

1. Detail.vue

1. data 增加 currentIndex: 0
2. detail-nav-bar 增加属性 ref="nav"
3. methods 增加 contentScroll(position)
4. scroll 增加属性 :probe-type="2" 和事件 @scroll="contentScroll"

<template>
  <div id="detail">
    <detail-nav-bar @titleClick="titleClick" class="detail-nav" ref="nav"/>
    <scroll 
      ref="scroll" 
      class="detail-scroll-content" 
      :probe-type="2"
      @scroll="contentScroll">
      <detail-swiper ref="swiper" :top-images="topImages"/>
      <detail-base-info :goods="goods"/>
      <detail-shop-info :shop="shop"/>
      <detail-goods-info :detail-info="detailInfo" @imageLoad="imageLoad"/>
      <detail-param-info ref="param" :param-info="paramInfo"/>
      <detail-comment-info ref="comment" :comment-info="commentInfo"/>
      <goods-list ref="recommond" :goods="recommends"/>
    </scroll>
  </div>
</template>

<script>
  import DetailNavBar from './childComps/DetailNavBar'
  import DetailSwiper from './childComps/DetailSwiper'
  import DetailBaseInfo from './childComps/DetailBaseInfo'
  import DetailShopInfo from './childComps/DetailShopInfo'
  import DetailGoodsInfo from './childComps/DetailGoodsInfo'
  import DetailParamInfo from './childComps/DetailParamInfo'
  import DetailCommentInfo from './childComps/DetailCommentInfo'

  import Scroll from 'components/common/scroll/Scroll'
  import GoodsList from 'components/content/goods/GoodsList'

  import {getDetail, getRecommend, Goods, Shop, GoodsParam} from 'network/detail'
  import { itemListenerMixin } from 'common/mixin'

  export default {
    name: 'Detail',
    components: {
      DetailNavBar,
      DetailSwiper,
      DetailBaseInfo,
      DetailShopInfo,
      DetailGoodsInfo,
      DetailParamInfo,
      DetailCommentInfo,
      Scroll,
      GoodsList
    },
    mixins: [itemListenerMixin],
    data() {
      return {
        iid: null,
        topImages: [],
        goods: {},
        shop: {},
        detailInfo: {},
        paramInfo: {},
        commentInfo: {},
        recommends: [],
        themeTopYs: [],
        currentIndex: 0
      }
    },
    methods: {
      getThemeTopYs() {
        this.themeTopYs = [
          this.$refs.swiper.$el.offsetTop,
          this.$refs.param.$el.offsetTop - 44,
          this.$refs.comment.$el.offsetTop - 44,
          this.$refs.recommond.$el.offsetTop - 44
        ]
      },
      imageLoad() {
        this.$refs.scroll.refresh()
        this.getThemeTopYs()
      },
      titleClick(index) {
        this.$refs.scroll.scrollTo(0, -this.themeTopYs[index], 200)
      },
      contentScroll(position) {
        // 1. 获取y值
        const positionY = -position.y
        // 2. positionY和主题中的值进行对比
        const len = this.themeTopYs.length
        for (let i in this.themeTopYs) {
          const intI = parseInt(i)// for ... in ... 遍历的索引是字符串
          const themeTopY = this.themeTopYs[intI]
          if (this.currentIndex !== intI
           && ((intI < len - 1 && positionY >= themeTopY && positionY < this.themeTopYs[intI + 1])
            || (intI === len - 1 && positionY >= themeTopY))) {
            this.currentIndex = intI
            this.$refs.nav.currentIndex = this.currentIndex
          }
        }
      }
    },
    created() {
      // 1. 保存传入的iid
      this.iid = this.$route.params.iid
      // 2. 根据iid请求详情数据
      getDetail(this.iid).then(res => {
        const data = res.result
        // 1. 获取顶部的图片轮播数据
        this.topImages = data.itemInfo.topImages
        // 2. 获取商品信息
        this.goods = new Goods(data.itemInfo, data.columns, data.shopInfo.services)
        // 3. 创建店铺信息的对象
        this.shop = new Shop(data.shopInfo)
        // 4. 保存商品的详情数据
        this.detailInfo = data.detailInfo
        // 5. 获取参数的信息
        this.paramInfo = new GoodsParam(data.itemParams.info, data.itemParams.rule)
        // 6. 取出评论的信息
        if (data.rate.cRate !== 0) {
          this.commentInfo = data.rate.list[0]
        }
        // 初始化scroll
        this.$nextTick(() => {
          this.$refs.scroll.createScroll()
        })
      })
      // 3. 请求推荐数据
      getRecommend().then(res => {
        this.recommends = res.data.list
      })
    }
  }
</script>

<style scoped>
  #detail {
    position: relative;
    z-index: 9;
    background-color: #fff;
    height: 100vh;
  }

  .detail-nav {
    position: relative;
    z-index: 9;
    background-color: #fff;
  }

  .detail-scroll-content {
    height: calc(100% - 44px);
  }
</style>