双列商品分类页面——uview+uniapp实现(单向联动+双向联动)_uview 购物菜单-CSDN博客

来源： 双列商品分类页面——uview+uniapp实现(单向联动+双向联动)_uview 购物菜单-CSDN博客

一个电商的app，商品的展示是必不可少的，联动分类展示是很常见的：

单向联动功能

实现效果：

1. 左侧是分类列表，有很多分类，可以滑动并点击
2. 右侧是该分类下的商品列表
3. 仅支持左侧点击后右侧内容改变，为单向联动展示
   
   <view class=”u-menu-wrap”>
   <scroll-view scroll-y scroll-with-animation class=”u-tab-view menu-scroll-view” :scroll-top=”scrollTop”>
   <view v-for=”(item,index) in tabbar” :key=”index” class=”u-tab-item” :class=”[current==index ? ‘u-tab-item-active’ : ”]”
   :data-current=”index” @tap.stop=”swichMenu(index)”>
   <text class=”u-line-1″>{{item.name}}</text>
   </view>
   </scroll-view>
   <block v-for=”(item,index) in tabbar” :key=”index”>
   <scroll-view scroll-y class=”right-box” v-if=”current==index”>
   <view class=”page-view”>
   <view class=”class-item”>
   <view class=”item-title”>
   <text>{{item.name}}</text>
   </view>
   <view class=”item-container”>
   <view class=”thumb-box” v-for=”(item1, index1) in item.foods” :key=”index1″>
   <image class=”item-menu-image” :src=”item1.icon” mode=””></image>
   <view class=”item-menu-name”>{{item1.name}}</view>
   </view>
   </view>
   </view>
   </view>
   </scroll-view>
   </block>
   </view>
   <script>
   import classifyData from “@/common/classify.data.js”;//是本地模拟的数据
   export default {
   data() {
   return {
   tabbar: classifyData,
   scrollTop: 0, //tab标题的滚动条位置
   current: 0, // 预设当前项的值
   menuHeight: 0, // 左边菜单的高度
   menuItemHeight: 0, // 左边菜单item的高度
   }
   },
   methods: {
   // 点击左边的栏目切换
   async swichMenu(index) {
   if(index == this.current) return ;
   this.current = index;
   // 如果为0，意味着尚未初始化
   if(this.menuHeight == 0 || this.menuItemHeight == 0) {
   await this.getElRect(‘menu-scroll-view’, ‘menuHeight’);
   await this.getElRect(‘u-tab-item’, ‘menuItemHeight’);
   }
   // 将菜单菜单活动item垂直居中
   this.scrollTop = index * this.menuItemHeight + this.menuItemHeight / 2 – this.menuHeight / 2;
   },
   // 获取一个目标元素的高度
   getElRect(elClass, dataVal) {
   new Promise((resolve, reject) => {
   const query = uni.createSelectorQuery().in(this);
   query.select(‘.’ + elClass).fields({size: true},res => {
   // 如果节点尚未生成，res值为null，循环调用执行
   if(!res) {
   setTimeout(() => {
   this.getElRect(elClass);
   }, 10);
   return ;
   }
   this[dataVal] = res.height;
   }).exec();
   })
   }
   }
   }
   </script>
   <style lang=”scss” scoped>
   .u-wrap {
   height: calc(100vh);
   /* #ifdef H5 */
   height: calc(100vh – var(–window-top));
   /* #endif */
   display: flex;
   flex-direction: column;
   }
   .u-search-box {
   padding: 18rpx 30rpx;
   }
   .u-menu-wrap {
   flex: 1;
   display: flex;
   overflow: hidden;
   }
   .u-search-inner {
   background-color: rgb(234, 234, 234);
   border-radius: 100rpx;
   display: flex;
   align-items: center;
   padding: 10rpx 16rpx;
   }
   .u-search-text {
   font-size: 26rpx;
   color: $u-tips-color;
   margin-left: 10rpx;
   }
   .u-tab-view {
   width: 200rpx;
   height: 100%;
   }
   .u-tab-item {
   height: 110rpx;
   background: #f6f6f6;
   box-sizing: border-box;
   display: flex;
   align-items: center;
   justify-content: center;
   font-size: 26rpx;
   color: #444;
   font-weight: 400;
   line-height: 1;
   }
   .u-tab-item-active {
   position: relative;
   color: #000;
   font-size: 30rpx;
   font-weight: 600;
   background: #fff;
   }
   .u-tab-item-active::before {
   content: “”;
   position: absolute;
   border-left: 4px solid $u-type-primary;
   height: 32rpx;
   left: 0;
   top: 39rpx;
   }
   .u-tab-view {
   height: 100%;
   }
   .right-box {
   background-color: rgb(250, 250, 250);
   }
   .page-view {
   padding: 16rpx;
   }
   .class-item {
   margin-bottom: 30rpx;
   background-color: #fff;
   padding: 16rpx;
   border-radius: 8rpx;
   }
   .item-title {
   font-size: 26rpx;
   color: $u-main-color;
   font-weight: bold;
   }
   .item-menu-name {
   font-weight: normal;
   font-size: 24rpx;
   color: $u-main-color;
   }
   .item-container {
   display: flex;
   flex-wrap: wrap;
   }
   .thumb-box {
   width: 33.333333%;
   display: flex;
   align-items: center;
   justify-content: center;
   flex-direction: column;
   margin-top: 20rpx;
   }
   .item-menu-image {
   width: 120rpx;
   height: 120rpx;
   }
   </style>

   双向联动

   实现效果：

   1. 左侧是分类列表，有很多分类，可以滑动并点击
   2. 右侧是该分类下的商品列表
   3. 左侧点击时右侧展示对应分类的商品，右侧支持滑动，滑动时左侧分类也会相应改变

   

   双向联动代码

   附录classify.data.js中的数据：

4. export default[
   {
   “name”: “女装”,
   “foods”: [
   {
   “name”: “A字裙”,
   “key”: “A字裙”,
   “icon”: “https://cdn.uviewui.com/uview/common/classify/1/1.jpg”,
   “cat”: 10
   },
   {
   “name”: “T恤”,
   “key”: “T恤”,
   “icon”: “https://cdn.uviewui.com/uview/common/classify/1/2.jpg”,
   “cat”: 10
   },
   {
   “name”: “半身裙”,
   “key”: “半身裙”,
   “icon”: “https://cdn.uviewui.com/uview/common/classify/1/3.jpg”,
   “cat”: 10
   },
   ]
   }
   ]
5. <view class=”u-menu-wrap”>
   <scroll-view scroll-y scroll-with-animation class=”u-tab-view menu-scroll-view” :scroll-top=”scrollTop”
   :scroll-into-view=”itemId”>
   <view v-for=”(item,index) in tabbar” :key=”index” class=”u-tab-item” :class=”[current == index ? ‘u-tab-item-active’ : ”]”
   @tap.stop=”swichMenu(index)”>
   <text class=”u-line-1″>{{item.name}}</text>
   </view>
   </scroll-view>
   <scroll-view :scroll-top=”scrollRightTop” scroll-y scroll-with-animation class=”right-box” @scroll=”rightScroll”>
   <view class=”page-view”>
   <view class=”class-item” :id=”‘item’ + index” v-for=”(item , index) in tabbar” :key=”index”>
   <view class=”item-title”>
   <text>{{item.name}}</text>
   </view>
   <view class=”item-container”>
   <view class=”thumb-box” v-for=”(item1, index1) in item.foods” :key=”index1″>
   <image class=”item-menu-image” :src=”item1.icon” mode=””></image>
   <view class=”item-menu-name”>{{item1.name}}</view>
   </view>
   </view>
   </view>
   </view>
   </scroll-view>
   </view>
   <script>
   import classifyData from ‘@/common/classify.data.js’;
   export default {
   data() {
   return {
   scrollTop: 0, //tab标题的滚动条位置
   oldScrollTop: 0,
   current: 0, // 预设当前项的值
   menuHeight: 0, // 左边菜单的高度
   menuItemHeight: 0, // 左边菜单item的高度
   itemId: ”, // 栏目右边scroll-view用于滚动的id
   tabbar: classifyData,
   menuItemPos: [],
   arr: [],
   scrollRightTop: 0, // 右边栏目scroll-view的滚动条高度
   timer: null, // 定时器
   }
   },
   onReady() {
   this.getMenuItemTop()
   },
   methods: {
   // 点击左边的栏目切换
   async swichMenu(index) {
   if(this.arr.length == 0) {
   await this.getMenuItemTop();
   }
   if (index == this.current) return;
   this.scrollRightTop = this.oldScrollTop;
   this.$nextTick(function(){
   this.scrollRightTop = this.arr[index];
   this.current = index;
   this.leftMenuStatus(index);
   })
   },
   // 获取一个目标元素的高度
   getElRect(elClass, dataVal) {
   new Promise((resolve, reject) => {
   const query = uni.createSelectorQuery().in(this);
   query.select(‘.’ + elClass).fields({
   size: true
   }, res => {
   // 如果节点尚未生成，res值为null，循环调用执行
   if (!res) {
   setTimeout(() => {
   this.getElRect(elClass);
   }, 10);
   return;
   }
   this[dataVal] = res.height;
   resolve();
   }).exec();
   })
   },
   // 观测元素相交状态
   async observer() {
   this.tabbar.map((val, index) => {
   let observer = uni.createIntersectionObserver(this);
   // 检测右边scroll-view的id为itemxx的元素与right-box的相交状态
   // 如果跟.right-box底部相交，就动态设置左边栏目的活动状态
   observer.relativeTo(‘.right-box’, {
   top: 0
   }).observe(‘#item’ + index, res => {
   if (res.intersectionRatio > 0) {
   let id = res.id.substring(4);
   this.leftMenuStatus(id);
   }
   })
   })
   },
   // 设置左边菜单的滚动状态
   async leftMenuStatus(index) {
   this.current = index;
   // 如果为0，意味着尚未初始化
   if (this.menuHeight == 0 || this.menuItemHeight == 0) {
   await this.getElRect(‘menu-scroll-view’, ‘menuHeight’);
   await this.getElRect(‘u-tab-item’, ‘menuItemHeight’);
   }
   // 将菜单活动item垂直居中
   this.scrollTop = index * this.menuItemHeight + this.menuItemHeight / 2 – this.menuHeight / 2;
   },
   // 获取右边菜单每个item到顶部的距离
   getMenuItemTop() {
   new Promise(resolve => {
   let selectorQuery = uni.createSelectorQuery();
   selectorQuery.selectAll(‘.class-item’).boundingClientRect((rects) => {
   // 如果节点尚未生成，rects值为[](因为用selectAll，所以返回的是数组)，循环调用执行
   if(!rects.length) {
   setTimeout(() => {
   this.getMenuItemTop();
   }, 10);
   return ;
   }
   rects.forEach((rect) => {
   // 这里减去rects[0].top，是因为第一项顶部可能不是贴到导航栏(比如有个搜索框的情况)
   this.arr.push(rect.top – rects[0].top);
   resolve();
   })
   }).exec()
   })
   },
   // 右边菜单滚动
   async rightScroll(e) {
   this.oldScrollTop = e.detail.scrollTop;
   if(this.arr.length == 0) {
   await this.getMenuItemTop();
   }
   if(this.timer) return ;
   if(!this.menuHeight) {
   await this.getElRect(‘menu-scroll-view’, ‘menuHeight’);
   }
   setTimeout(() => { // 节流
   this.timer = null;
   // scrollHeight为右边菜单垂直中点位置
   let scrollHeight = e.detail.scrollTop + this.menuHeight / 2;
   for (let i = 0; i < this.arr.length; i++) {
   let height1 = this.arr[i];
   let height2 = this.arr[i + 1];
   // 如果不存在height2，意味着数据循环已经到了最后一个，设置左边菜单为最后一项即可
   if (!height2 || scrollHeight >= height1 && scrollHeight < height2) {
   this.leftMenuStatus(i);
   return ;
   }
   }
   }, 10)
   }
   }
   }
   </script>
   <style lang=”scss” scoped>
   .u-wrap {
   height: calc(100vh);
   /* #ifdef H5 */
   height: calc(100vh – var(–window-top));
   /* #endif */
   display: flex;
   flex-direction: column;
   }
   .u-search-box {
   padding: 18rpx 30rpx;
   }
   .u-menu-wrap {
   flex: 1;
   display: flex;
   overflow: hidden;
   }
   .u-search-inner {
   background-color: rgb(234, 234, 234);
   border-radius: 100rpx;
   display: flex;
   align-items: center;
   padding: 10rpx 16rpx;
   }
   .u-search-text {
   font-size: 26rpx;
   color: $u-tips-color;
   margin-left: 10rpx;
   }
   .u-tab-view {
   width: 200rpx;
   height: 100%;
   }
   .u-tab-item {
   height: 110rpx;
   background: #f6f6f6;
   box-sizing: border-box;
   display: flex;
   align-items: center;
   justify-content: center;
   font-size: 26rpx;
   color: #444;
   font-weight: 400;
   line-height: 1;
   }
   .u-tab-item-active {
   position: relative;
   color: #000;
   font-size: 30rpx;
   font-weight: 600;
   background: #fff;
   }
   .u-tab-item-active::before {
   content: “”;
   position: absolute;
   border-left: 4px solid $u-type-primary;
   height: 32rpx;
   left: 0;
   top: 39rpx;
   }
   .u-tab-view {
   height: 100%;
   }
   .right-box {
   background-color: rgb(250, 250, 250);
   }
   .page-view {
   padding: 16rpx;
   }
   .class-item {
   margin-bottom: 30rpx;
   background-color: #fff;
   padding: 16rpx;
   border-radius: 8rpx;
   }
   .class-item:last-child {
   min-height: 100vh;
   }
   .item-title {
   font-size: 26rpx;
   color: $u-main-color;
   font-weight: bold;
   }
   .item-menu-name {
   font-weight: normal;
   font-size: 24rpx;
   color: $u-main-color;
   }
   .item-container {
   display: flex;
   flex-wrap: wrap;
   }
   .thumb-box {
   width: 33.333333%;
   display: flex;
   align-items: center;
   justify-content: center;
   flex-direction: column;
   margin-top: 20rpx;
   }
   .item-menu-image {
   width: 120rpx;
   height: 120rpx;
   }
   </style>