本篇内容介绍了“微信小程序如何实现商品数据联动效果”的有关知识，在实际案例的操作过程中，不少人都会遇到这样的困境，接下来就让小编带领大家学习一下如何处理这些情况吧！希望大家仔细阅读，能够学有所成！
微信小程序实现商品数据联动
js部分：
// pages/demo1/demo1.js
//存放右侧分类的高度累加数组
var heightList = [];
//记录scroll-view滚动过程中距离顶部的高度
var distanceToTop = 0;
Page({
/**
* 页面的初始数据
*/
data: {
curActive: 0, //当前选中项
productList: [{
c_name: '新鲜水果',
list: [{
id: 0,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '樱桃'
},
{
id: 1,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '荔枝'
},
{
id: 2,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '荔枝'
},
{
id: 3,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '荔枝'
},
{
id: 4,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '荔枝'
},
{
id: 5,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '荔枝'
},
{
id: 6,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '荔枝'
},
{
id: 7,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '荔枝'
},
]
},
{
c_name: '海鲜水产',
list: [{
id: 0,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
},
{
id: 1,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
},
{
id: 2,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
}, {
id: 3,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
}, {
id: 4,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
}, {
id: 5,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
}, {
id: 6,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
}, {
id: 7,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
}, {
id: 8,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
},
]
},
{
c_name: '测试数据1',
list: [{
id: 0,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
},
{
id: 1,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
},
{
id: 2,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
}, {
id: 3,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
}, {
id: 4,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
}, {
id: 5,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
}, {
id: 6,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
}, {
id: 7,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
}, {
id: 8,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
},
]
},
{
c_name: '测试数据2',
list: [{
id: 0,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
},
{
id: 1,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
},
{
id: 2,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
}, {
id: 3,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
}, {
id: 4,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
}, {
id: 5,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
}, {
id: 6,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
}, {
id: 7,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
}, {
id: 8,
img: 'https://img.alicdn.com/imgextra/i4/615340156/O1CN0117eRFg1D1UYcEhmXj_!!0-saturn_solar.jpg_468x468q75.jpg_.webp',
goodsName: '鲍鱼'
},
]
}
]
},
/**
* 左侧: 菜单事件
* @param {*} e
*/
selectMenu(e) {
let index = e.currentTarget.dataset.index;
this.setData({
curActive: index,
toView: "nav" + index
})
},
/**
* 获取商品列表高度
* 计算右侧商品某分类的高度
*/
getProListHeight() {
let tmpHeightList = [];
let tmpH = 0; //临时存放每个分类的高度
// 获取元素信息 返回一个 SelectorQuery 对象实例
const query = wx.createSelectorQuery()
query.selectAll('.product').boundingClientRect()
query.exec(function (res) {
res[0].forEach((item) => {
tmpH += item.height;
// Math.floor()向下取整 【根据个人需要修改】
tmpHeightList.push(Math.floor(tmpH));
})
heightList = tmpHeightList;
console.log(heightList);
})
},
/**
* 监听滚动时触发事件
* @param {*} e
*/
scroll(e) {
if (heightList.length == 0) return;
let scrollTop = e.detail.scrollTop; //滚动位置
let current = this.data.curActive;
console.log('scrollTop======>', scrollTop);
if (scrollTop > distanceToTop) {
//如果右侧 可视区域的竖直滚动位置 超过 当前列表选中项距顶部的高度（且没有下标越界），则更新左侧选中项
if ((current + 1 < heightList.length) && (scrollTop >= heightList[current])) {
this.setData({
curActive: current + 1
})
}
} else {
//如果右侧 可视区域的竖直滚动位置 小于 当前列表选中的项距顶部的高度，则更新左侧选中项
if ((current - 1 >= 0) && (scrollTop < heightList[current - 1])) {
this.setData({
curActive: current - 1
})
}
}
//更新顶部的距离
distanceToTop = scrollTop;
},
/**
* 生命周期函数--监听页面加载
*/
onLoad: function (options) {
// 获取商品列表高度
this.getProListHeight();
},
/**
* 生命周期函数--监听页面初次渲染完成
*/
onReady: function () {
},
/**
* 生命周期函数--监听页面显示
*/
onShow: function () {
},
/**
* 生命周期函数--监听页面隐藏
*/
onHide: function () {},
/**
* 生命周期函数--监听页面卸载
*/
onUnload: function () {
},
/**
* 页面相关事件处理函数--监听用户下拉动作
*/
onPullDownRefresh: function () {
console.log('触发下拉')
},
/**
* 页面上拉触底事件的处理函数
*/
onReachBottom: function () {
console.log('触发上拉触底')
},
/**
* 用户点击右上角分享
*/
onShareAppMessage: function () {}
})
然后是wxml部分：
<view class="title">商品数据联动</view>
<view class="box">
<view class="left">
<scroll-view scroll-y="true" scroll-with-animation="true" class="container">
<view class="menu-item {{index == curActive ? 'active' : ''}}" wx:for="{{productList}}" data-index="{{index}}" wx:key="index" bindtap="selectMenu">
{{item.c_name}}
</view>
</scroll-view>
</view>
<view class="right">
<scroll-view scroll-y="true" scroll-with-animation="true" bindscroll="scroll" scroll-into-view="{{toView}}" >
<block wx:for="{{productList}}" wx:key="*this">
<!-- id：实现点击左侧某分类时，右侧滚动至相应位置（注意：id不能以数字开头）-->
<view id="nav{{index}}" class="product">
<view class="c_name">{{item.c_name}}</view>
<view class="goods-box">
<view class="goods-item" wx:for="{{item.list}}" wx:for-item='items' wx:key="index">
<image class="goods-img" src="{{items.img}}" mode="aspectFit"></image>
<view class="goods-name">{{items.goodsName}}</view>
</view>
</view>
</view>
</block>
<view class="bottom">到底了~没有更多了</view>
</scroll-view>
</view>
</view>
然后是css部分：
.title {
text-align: center;
margin-top: 30px;
}
.box{
width: 100%;
height: 400px;
display: flex;
}
.left {
width: 80px;
display: inline-block;
}
.right{
flex: 1;
background: #ccc;
}
.container {
width: 100%;
height: 400px;
background-color: gray;
padding: 0;
}
.menu-item {
width: 100%;
height: 50px;
border-bottom: 1px solid #000;
background-color: pink;
line-height: 50px;
text-align: center;
}
.active {
background-color: red;
}
.c_name{
width: 100%;
text-align: center;
padding-top: 20px;
}
.goods-box {
display: flex;
justify-content: flex-start;
flex-wrap: wrap;
}
.goods-item{
width: 80px;
height: 100px;
display: flex;
flex-direction: column;
justify-content: center;
align-items: center;
}
.goods-img{
width: 50px;
}
.bottom{
width: 100%;
height: 60px;
text-align: center;
line-height: 80px;
font-size: 10px;
color: rgb(139, 135, 135);
}
“微信小程序如何实现商品数据联动效果”的内容就介绍到这里了，感谢大家的阅读。如果想了解更多行业相关的知识可以关注本站网站，小编将为大家输出更多高质量的实用文章！
