微信小程序实现购物页面左右联动

本文实例为大家分享了微信小程序实现购物页面左右联动的具体代码，供大家参考，具体内容如下

效果图：

wxml

<view class="pro-container">
 <scroll-view class="left-menu" scroll-y scroll-with-animation="true" scroll-top="{{leftMenuTop}}">
  <view class="menu-item {{index===currentActiveIndex?'menu-active':''}}" wx:for="{{item}}" wx:key="{{item.index}}" id="{{index}}" catchtap='changeMenu' >{{item.typename}}</view>
 </scroll-view>
 <scroll-view v-if="item!=''" class="right-pro" bindscroll = "scroll" scroll-y scroll-with-animation="true" scroll-top="{{rightProTop}}">
  <view class="pro-item" wx:for="{{item}}">
    <view class="item-header">{{item.typename}}</view>
    <view class="pro-item-container">
      <view wx:for="{{item.shop_goods}}" wx:key="{{index}}" class="pro-item-item"> 
      <image lazy-load="true" src="{{item}}"></image>
      <text>{{item.goodname}}</text>
     </view>
    </view>
  </view>
 </scroll-view>
</view>

wxss

.left-menu{
 position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  width: 180rpx;
  background-color: #f8f8f8;
  font-size: 32rpx;
}
::-webkit-scrollbar{
 width: 0;
 height: 0;
 color: transparent;
}
.left-menu .menu-item{
 width: calc(100% - 16rpx);
 height: 80rpx;
 padding:0 8rpx;
 line-height: 80rpx;
 text-align: center;
}
.left-menu .menu-item.menu-active{
 border-left:8rpx solid red;
 padding-left: 0;
 background-color: #fff;
}
 
/* 右边商品区域 */
.right-pro{
 position: absolute;
 left: 180rpx;
 top:0;
 bottom: 0;
 width:calc(100% - 180rpx);
 background-color: #fff; 
 display: flex;
 overflow: hidden;
}
.right-pro .pro-item{
 padding:20rpx;
}
.right-pro .item-header{
 display: inline-block;
 font-size: 30rpx;
 line-height: 40rpx;
 color: #fff;
 background-color: red;
 padding:0rpx 30rpx; 
 margin: 10rpx auto;
}
.right-pro .pro-item-container{
 font-size: 28rpx;
}
.pro-item-item{
 width: calc((100% - 180rpx) / 2 );
 display:inline-block; 
}
.right-pro .pro-item-container image{
 width: 100rpx;
 height: 100rpx;
 display: block;
 margin: 0 auto;
}
.right-pro .pro-item-container text{
 display: block;
 text-align: center;
}

wxjs

let proListToTop = [], menuToTop = [], MENU = 0, windowHeight,timeoutId;
// MENU ==> 是否为点击左侧进行滚动的，如果是，则不需要再次设置左侧的激活状态
Page({
 data: {
  proList: [],
  item: [],
  item2:[
   {
    "typename": "服饰",
   },
   {
    "typename": "服饰",
   },
   {
    "typename": "服饰",
   },
   {
    "typename": "服饰",
   },
   {
    "typename": "服饰",
   },
   {
    "typename": "服饰",
   },
   {
    "typename": "服饰",
   },
   {
    "typename": "服饰",
   },
   {
    "typename": "服饰",
   },
   {
    "typename": "服饰",
   },
   {
    "typename": "服饰",
   },
   {
    "typename": "服饰",
   },
   {
    "typename": "服饰",
   },
   {
    "typename": "服饰",
   },
   {
    "typename": "服饰",
   },
   {
    "typename": "服饰",
   },
   {
    "typename": "服饰",
   },
   {
    "typename": "服饰",
   },
  ],
  currentActiveIndex: 0
 },
 onLoad: function (options) {
  // ---------------------------ajax----------------------
  var utilMd5 = require('../../utils/md5.js');
  var md5 = utilMd5.hexMD5;
  var timestamp = new Date().getTime();
  var that = this;
  var jsonStr = JSON.stringify({ "shopid": "34" });
  var token = md5(jsonStr + timestamp) + timestamp;
  wx.request({
   url: "https://api.jvjiewang.com/Home/Shop/goods",
   data: {
    jsonStr: jsonStr,
    token: token
   },
   method: 'POST',
   header: {
    "Content-Type": "application/x-www-form-urlencoded"
   },
   success: function (res) {
    console.log(res.data.respond);
    var items = res.data.respond;
    that.setData({
     item: items
    })
   }
  })
//----------------------------ajax----------------------
  // 确保页面数据已经刷新完毕~
  setTimeout(() => {
   this.getAllRects()
  }, 200)
 },
 changeMenu(e) {
  // 改变左侧tab栏操作
  if (Number(e.target.id) === this.data.currentActiveIndex) return
  MENU = 1
  this.setData({
   currentActiveIndex: Number(e.target.id),
   rightProTop: proListToTop[Number(e.target.id)]
  })
  this.setMenuAnimation(Number(e.target.id))
 },
 scroll(e) {
  for (let i = 0; i < proListToTop.length; i++) {
   if (e.detail.scrollTop < proListToTop[i] && i !== 0 && e.detail.scrollTop > proListToTop[i - 1]) {
    return this.setDis(i)
   }
  }
  // 找不到匹配项，默认显示第一个数据
  if (!MENU) {
   this.setData({
    currentActiveIndex: 0
   })
  }
  MENU = 0
 },
 setDis(i) {
  // 设置左侧menu栏的选中状态
  if (i !== this.data.currentActiveIndex + 1 && !MENU) {
   this.setData({
    currentActiveIndex: i - 1
   })
  }
  MENU = 0
  this.setMenuAnimation(i)
 },
 setMenuAnimation(i){
  // 设置动画，使menu滚动到指定位置。
  let self = this
  
  if (menuToTop[i]) {
   console.log(11111)
   // 节流操作
   if(timeoutId){
    clearTimeout(timeoutId)
   }
   timeoutId = setTimeout(()=>{
    console.log(12138)
    self.setData({
     leftMenuTop: (menuToTop[i].top - windowHeight)
    })
   },50)
  } else {
   if (this.data.leftMenuTop === 0) return
   this.setData({
    leftMenuTop: 0
   })
  }
 },
 getActiveReacts(){
  wx.createSelectorQuery().selectAll('.menu-active').boundingClientRect(function (rects) {
   return rects[0].top
  }).exec()
 },
 getAllRects() {
 
  // 获取商品数组的位置信息
  wx.createSelectorQuery().selectAll('.pro-item').boundingClientRect(function (rects) {
   rects.forEach(function (rect) {
    proListToTop.push(rect.top)
   })
  }).exec()
 
  // 获取menu数组的位置信息
  wx.createSelectorQuery().selectAll('.menu-item').boundingClientRect(function (rects) {
   wx.getSystemInfo({
    success: function (res) {
     windowHeight = res.windowHeight / 2
     rects.forEach(function (rect) {
      menuToTop.push({
       top: rect.top,
       // animate:rect.top > windowHeight
       })
     })
    }
   })
  }).exec()
 },
 // 获取系统的高度信息
 getSystemInfo() {
  let self = this
  wx.getSystemInfo({
   success: function (res) {
    windowHeight = res.windowHeight / 2
   }
  })
 }
})

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持呐喊教程。

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