微信小程序实现滚动菜单的功能

实现滚动菜单效果图

WXML

<!--pages/menu/menu.wxml-->
<view>
  <my-banner swiperArr="{{swiperArr}}"></my-banner> //轮播图组件(代码在底部)

  <view class='main'>
    //左边的导航栏菜单
    <scroll-view class="left" scroll-y="true" scroll-into-view="{{leftId}}">
      <view id="left{{item.id}}" data-myid="{{item.id}}" class="scroll-view-item {{item.id==currentNum?'active':''}}"
        wx:for="{{menuArr}}" wx:key="*this" bindtap="leftClickfn">{{item.title}}</view>
    </scroll-view>
    //右边的菜单
    <scroll-view class="right" scroll-with-animation="true" scroll-y="true" bindscroll="scroll" scroll-into-view="{{rightId}}" bindscroll="scrollrightFn">
      <view id="right{{item.id}}" class="scroll-view-items rightblock" wx:for="{{menuArr}}" wx:key="*this">
        <view class="title">{{item.title}}</view>
        <view class="content">
          <view class="box" wx:for="{{item.subArr}}" wx:key="*this" wx:for-item="items">
            <image src="{{items.imgSrc}}" mode="widthFix"></image>
            <text>{{items.imgDesc}}</text>
          </view>
        </view>
      </view>
    </scroll-view>
  </view>
</view>

WXSS

swiper {
  //轮播图
  height: calc(100vw / 1080 * 520);
}
.main {
  /* background-color: pink; */
  //当前可视高度减去轮播图的高度
  height: calc(100vh - calc(100vw / 1080 * 520));
}
.main .left {
  border-right: 1rpx solid #000;
  width: 25%;
  height: calc(100vh - calc(100vw / 1080 * 520));
  box-sizing: border-box;
  float: left;
}
.left view {
  height: 80rpx;
  background-color: #fff;
  border-bottom: 1rpx solid #ccc;
  line-height: 80rpx;
  text-align: center;
  position: relative;
}
.left view::before {
  content: "";
  width: 10rpx;
  height: 80rpx;
  background-color: #fff;
  position: absolute;
  left: 0;
  top: 0;
}
.left view.active::before {
  //当前选中的样式
  background-color: #333999;
}

.main .right {
 //右边的商品
  width: 75%;
  float: right;
  height: calc(100vh - calc(100vw / 1080 * 520));
  padding: 0 2%;
  box-sizing: border-box;
}
.right .title {
  height: 60rpx;
  line-height: 60rpx;
}
.right .content {
  background-color: #fff;
  padding: 1%;
  display: flex;
  padding-right: 0;
  box-sizing: border-box;
  justify-content: flex-start;
  flex-wrap: wrap;
}
.box {
  width: 32%;
  margin-right: 1%;
  text-align: center;
  margin-bottom: 10rpx;
}
.box image {
  width: 90%;
  display: block;
  margin: 0 auto;
}
.box text {
  text-align: center;
  font-size: 28rpx;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  display: block;
}

JS

// pages/menu/menu.js
Page({
  data: {
    //轮播图
    swiperArr: ['/images/banner/menubanner1.jpg', '/images/banner/menubanner2.jpg', '/images/banner/menubanner3.jpg'],
    //menu
    menuArr: [{
        "id": 0,
        "title": "人气Top",
        "subArr": [{
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "拿铁"
          },
          {
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "桃桃芝士红宝石"
          },
          {
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "咖啡风味安慕希"
          },
          {
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "陨石拿铁"
          }
        ]
      },
      {
        "id": 1,
        "title": "大师咖啡",
        "subArr": [{
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "冲绳黑糖拿铁"
          },
          {
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "陨石拿铁"
          },
          {
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "拿铁"
          }
        ]
      },
      {
        "id": 2,
        "title": "小鹿茶精选",
        "subArr": [{
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "标准美式"
          },
          {
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "加浓美式"
          },
          {
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "焦糖标准美式"
          },
          {
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "焦糖加浓拿铁"
          },
          {
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "银河气泡美式"
          },
          {
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "银河气泡美式"
          },
          {
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "银河气泡美式"
          },
          {
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "银河气泡美式"
          }
        ]
      },
      {
        "id": 3,
        "title": "瑞纳冰",
        "subArr": [{
          "imgSrc": "/images/menu/1-1.jpg",
          "imgDesc": "乐岛桃桃冰"
        }]
      },
      {
        "id": 4,
        "title": "鲜榨果蔬汁",
        "subArr": [{
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "NFC鲜榨橙汁"
          },
          {
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "NFC鲜榨西柚汁"
          },
          {
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "猕猴桃复合果汁"
          }
        ]
      },
      {
        "id": 5,
        "title": "经典饮品",
        "subArr": [{
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "巧克力"
          },
          {
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "纯牛奶"
          }
        ]
      },
      {
        "id": 6,
        "title": "健康轻食",
        "subArr": [{
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "京味烤鸭鲜蔬卷"
          },
          {
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "夏威夷菠萝火山卷"
          },
          {
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "火腿芝士羊角"
          },
          {
            "imgSrc": "/images/menu/1-1.jpg",
            "imgDesc": "鸡肉卷"
          }
        ]
      }
    ],
    //左侧id
    leftid: 'left0',
    //当前项
    currentNum: 0,
    //右侧id
    rightId: 'right0',
    //右侧高度的数组
    heightArr: []
  },
  leftClickfn(e) {
  //点击左边的导航栏，跳到对应的商品区块
    this.setData({
      //获取自定义属性data-myid赋值
      currentNum: e.currentTarget.dataset.myid,
      leftid: 'left' + e.currentTarget.dataset.myid,
      rightId: 'right' + e.currentTarget.dataset.myid
    })
  },
  scrollrightFn(e) {
    //滑动
    let arr = this.data.heightArr;
    let st = e.detail.scrollTop;
    for (let i = 0; i < arr.length; i++) {
      //当前滑动的高度大于数组里的项的时候，进行跳转到对应的商品区块
      if (st >= arr[i] && st < arr[i + 1] - 10) {
        this.setData({
          leftid: 'left' + i,
          currentNum: i
        })
      }
    }

  },
  /**
   * 生命周期函数--监听页面初次渲染完成
   */
  //获取每个区块的高度
  onReady: function () {
    let _this = this;
    setTimeout(() => {
      let initArr = [0] //初始化数组
      let initNum = 0 //初始化数字
      const query = wx.createSelectorQuery()
      query.selectAll('.rightblock').boundingClientRect()
      query.selectViewport().scrollOffset()
      query.exec(function (res) {
        // console.log(res[0]); //得到每个模块的高度
        res[0].map(e => {
          initNum += e.height; //每个模块的高度给到初始值
          initArr.push(initNum); //添加到数组
        })
        // console.log(initArr);
        _this.setData({
          heightArr: initArr
        })

      })
    }, 300);
  },
})

附上轮播图的代码:(组件的轮播Components)

轮播图效果图

WXML

<view>
  <swiper autoplay="{{autoplay}}" interval="{{interval}}" duration="{{duration}}" bindchange="swiperFn">
    <swiper-item wx:for="{{swiperArr}}" wx:key="*this">
      <image src="{{item}}" mode="widthFix"></image>
    </swiper-item>
  </swiper>
</view>

<view class="swiper">
  <view class="indicator">
    <view wx:for="{{swiperArr}}" wx:key="*this" class="{{index==swiperNum ? 'active' : ''}}"> </view>
  </view>
</view>

WXSS

swiper image {
  width: 100vw;
}
.swiper{
  position: relative;
}
.indicator {
  position: absolute;
  right: 20rpx;
  bottom: 20rpx;
}

.indicator view {
  width: 30rpx;
  height: 30rpx;
  background: #ccc;
  border-radius: 30rpx;
  float: left;
  margin-left: 20rpx;
  transition: all 1s linear;
}
.indicator view.active {
  width: 50rpx;
  background: #34399C;
}

JS

// components/banner/banner.js
Component({
  properties: {
    swiperArr: {
      //定义类型
      type: Array,
      //定义默认值
      value: []
    }
  },
  data: {
    autoplay: true,
    swiperNum: 0,
    interval: 2000,
    duration: 500,
  },
  methods: {
    swiperFn(e) {
      this.setData({
        swiperNum: e.detail.current
      })
    }
  }
})

JSON

{
  "usingComponents": {},
  "component":true
}


  "usingComponents": {
    "my-banner":"/components/banner/banner"
  },
©著作权归作者所有,转载或内容合作请联系作者
平台声明：文章内容（如有图片或视频亦包括在内）由作者上传并发布，文章内容仅代表作者本人观点，简书系信息发布平台，仅提供信息存储服务。