Vue 实现滚动楼层导航定位（可实现监听页面滚动和监听某元素滚动）

实现思路：

在vue中使用v-for动态渲染楼层和楼层导航，然后使用原生JavaScript实现楼层导航动态更新与楼层滚动定位

１、页面初始化时定位首个楼层

２、页面滚动楼层自动定位到相应的楼层导航并高亮显示

３、鼠标点击楼层导航时，当前楼层导航高亮显示，并且页面自动滚动到相应的楼层

效果

页面布局  和 style

 .floor-nav {
    // position: fixed;
    // top: 180px;
    // left: 350px;
    // z-index: 10;
    float: left
  }
  .nav-list {
    width: 80px;
    padding: 0;
    display: inline-block;
    text-align: center;
    background-color: #f8f8f8;
    margin-top: 0;
    margin-right: 5px
  }
  .nav-list-item {
    display: inline-block;
    width: 100%;
    height: 100%;
    line-height: 48px;
    vertical-align: middle;
    align-self: center;
    border-bottom: 1px solid #fff;
    cursor: pointer;
    background: #067749 !important;
    color: #FFF;
    font-size: 14px;
  }
  .nav-list-item.active,
  .nav-list-item:hover {
    color: rgb(112, 243, 255);
  }
  .floor-item {
    width: 100%;
    margin: 60px auto;
    min-height: 300px;
    text-align: center;
    color: #FFF;
    background-color: #404040;
  }

 

数据 放在data中

 element: {
          nav_item: null,
          floor_item: null
        },
        timer: null,
        floorNavList: [{
          id: 1,
          name: '主诉现病史'
        }, {
          id: 2,
          name: '既往史'
        }, {
          id: 3,
          name: '过敏史'
        }, {
          id: 4,
          name: '诊断'
        }, {
          id: 5,
          name: '处方类型'
        }, {
          id: 6,
          name: '检验'
        }, {
          id: 7,
          name: '检查'
        }, {
          id: 8,
          name: '手术'
        }, {
          id: 9,
          name: '治疗'
        }, {
          id: 10,
          name: '用血'
        }, {
          id: 11,
          name: '会诊'
        }, {
          id: 12,
          name: '病历文书'
        }],

滚动事件监听 

 （1）监听页面滚动

    mounted () {
        this.element = {
          nav_item: document.getElementsByClassName('nav-list-item'),
          floor_item: document.getElementsByClassName('floor-item')
        }
        this.element.nav_item[0].classList.add('active')
        window.addEventListener('scroll', this.floorSrcollEventListener)
      },
      beforeDestroy () { 
        window.removeEventListener('scroll', this.floorSrcollEventListener)
      },

 

（2）监听元素滚动

   tips：需要监听的这个元素需要拥有固定的高度

    mounted () {
        this.element = {
          nav_item: document.getElementsByClassName('nav-list-item'),
          floor_item: document.getElementsByClassName('floor-item')
        }
        this.element.nav_item[0].classList.add('active')
      },
      beforeDestroy () { 
        window.removeEventListener('scroll', this.floorSrcollEventListener)
      },

     tips：如果页面进行了keep-alive  beforeDestroy 就要换成 deactivated

原生js部分

export default {
  methods: {
     /**
     * 监听窗口滚动楼层导航动态定位
     */
      floorSrcollEventListener() {
        const { nav_item, floor_item } = this.element
        const window_scrollTop = this.$el.querySelector('#floorWarp').scrollTop
        for (let i = 0, len = floor_item.length; i < len; i++) {
          const floor_offsetTop = floor_item[i].offsetTop - floor_item[0].offsetTop
          if (window_scrollTop >= floor_offsetTop) {
            for (let n = 0, len = nav_item.length; n < len; n++) {
              const current_classList = nav_item[n].classList
              i === n
                ? current_classList.add('active')
                : current_classList.remove('active')
            }
          }
        }
      },
      /**
     * 设置楼层导航事件驱动方法
     * @param {Number} index  楼层下标
     */
      setFloorNavMountClick(index) {
        const { floor_item } = this.element
        const floor_offsetTop = floor_item[index].offsetTop
        const window_scrollTop = this.$el.querySelector('#floorWarp').scrollTop
        const timer = {
          step: 60,
          times: 16,
          FLOOR_OFFSETTOP: floor_offsetTop
        }
        if (window_scrollTop > floor_offsetTop) {
          this.setFloorScrollArrowUp(timer)
        } else if (window_scrollTop === floor_offsetTop) {
          return false
        } else {
          this.setFloorScrollArrowDown(timer)
        }
      },
      /**
     * 设置楼层向上滚动
     * @param {Object} timer 定时器配置
     */
      setFloorScrollArrowUp(timer) {
        clearInterval(this.timer)
        this.timer = setInterval(() => {
          const window_scrollTop = this.$el.querySelector('#floorWarp').scrollTop
          if (window_scrollTop <= timer.FLOOR_OFFSETTOP) {
            this.$el.querySelector('#floorWarp').scrollTop = timer.FLOOR_OFFSETTOP
            clearInterval(this.timer)
          } else {
            this.$el.querySelector('#floorWarp').scrollTop = window_scrollTop - timer.step
          }
        }, timer.times)
      },
      /**
     * 设置楼层向下滚动
     * @param {Object} timer 定时器配置
     */
      setFloorScrollArrowDown(timer) {
        clearInterval(this.timer)
        this.timer = setInterval(() => {
          const window_scrollTop = this.$el.querySelector('#floorWarp').scrollTop
  
          if (window_scrollTop >= timer.FLOOR_OFFSETTOP) {
            this.$el.querySelector('#floorWarp').scrollTop = timer.FLOOR_OFFSETTOP
            clearInterval(this.timer)
          } else {
            if (window_scrollTop === 2095) {
              clearInterval(this.timer)
              return false
            }
            this.$el.querySelector('#floorWarp').scrollTop = window_scrollTop + timer.step
          
          }
        }, timer.times)
      },
  }
}