1.效果界面
2.涉及功能
*左侧商品类型、右侧商品可以相互控制；
*商品列表加减及购物车商品加减icon消失、显示；
*商品每一次加减，页面视图变化（数量、价格变化、购物车置灰）；
3.贴上所有代码
1.wxml
<view class="container">
<view class="index-cont">
<!-- 左边类型 -->
<view class="index-left">
<view wx:for="{{foodsList}}" wx:key="index" class="item {{curId === 'item'+index" data-id="item{{index}}" bindtap="scrollToViewFn">{{item.name}}</view>
</view>
<!-- 右边产品 -->
<scroll-view class="index-right" scroll-y="{{true}}" scroll-into-view="{{initView}}" scroll-with-animation="true" bindscroll="onPageScroll">
<view class="boxs">
<block wx:for="{{foodsList}}" wx:key="index">
<view class="index-title" id="item{{index}}">{{item.name}}</view>
<view class="item" wx:for="{{item.list}}" wx:key="ind" wx:for-item="itm" wx:for-index="ind" bindtap="showGoodDetail(itm)">
<view class="pic"><image src="/UploadFiles/2021-04-02/{{itm.pic}}">
2.script
createPage({
data: {
foodsList: [], // 商品数据
cartList: [], // 购物车数据
isShowCartMask: false,
totalNum: 0,
totalMoney: 0,
initView: 'item0', // 根据此变量的变化，控制左侧选中状态、右侧滑动
curId: 'item0',
isShowDetail: false,
goodDetail: {},
screenWidth: 0, // 手机屏幕宽度
heightArray: [0] // 右侧每一个类型的高度区间数组
},
onLoad() {
this.getGoodsData()
},
methods: {
async getGoodsData() {
const that = this
const res = await getGoodsInfo({})
this.foodsList = res
wx.getSystemInfo({
success: (ress) => {
that.screenWidth = ress.windowWidth
}
})
this.getHeightSection()
},
// 设置高度区间 所有单位转化为rpx
getHeightSection() {
const that = this
let hg = 0
for (let index = 0; index < that.foodsList.length - 1; index++) {
hg += 70 + that.foodsList[index].list.length * 212
that.heightArray.push(hg)
}
},
// 获取高度区间的下标
getHeightIndex(arr, hg) {
const that = this
arr.forEach((item, index) => {
if (hg >= item) {
that.setData({
curId: 'item' + index
})
}
})
},
// 左边菜单控制右边
scrollToViewFn(e) {
this.setData({
initView: e.target.dataset.id,
curId: e.target.dataset.id
})
},
// 右边滚动控制左边
onPageScroll(e) {
const that = this
let scrollTop = e.detail.scrollTop * 750 / that.screenWidth
this.getHeightIndex(that.heightArray, scrollTop)
},
// 商品列表的减号点击
reduceNum(index, ind, item) {
const that = this
let val = 'foodsList[' + index + '].list[' + ind + '].num'
this.setData({
[val]: item.num - 1
})
// 如果商品为0，就把当前商品在购物车清除
// 如果不为0， 就将当前商品数量减1
if (that.foodsList[index].list[ind].num === 0) {
that.removeAarry(that.cartList, item.id)
} else {
that.cartList.forEach((itm, i) => {
if (itm.id === item.id) {
let value = 'cartList[' + i + '].num'
that.setData({
[value]: itm.num - 1
})
}
})
}
this.computed()
},
// 商品列表的加号点击
addNum(index, ind, item) {
const that = this
let val = 'foodsList[' + index + '].list[' + ind + '].num'
this.setData({
[val]: item.num + 1
})
// 如果商品为1，就把当前商品加入购物车
// 否则， 就将当前商品数量加1
if (that.foodsList[index].list[ind].num === 1) {
let val = { id: item.id, name: item.title, price: item.price, num: 1, index: index, ind: ind, pic: item.pic }
that.cartList.push(val)
} else {
that.cartList.forEach((itm, i) => {
if (itm.id === item.id) {
let value = 'cartList[' + i + '].num'
that.setData({
[value]: itm.num + 1
})
}
})
}
this.computed()
},
// 购物车的减号点击
reduceCart(index, item) {
const that = this
let val = 'foodsList[' + item.index + '].list[' + item.ind + '].num'
let val1 = 'cartList[' + index + '].num'
this.setData({
[val]: item.num - 1,
[val1]: item.num - 1
})
// 如果商品为0，就把当前商品在购物车清除
// 如果不为0， 就将当前商品数量减1
if (that.cartList[index].num === 0) {
that.removeAarry(that.cartList, item.id)
}
this.computed()
},
// 购物车的加号点击
addCart(index, item) {
const that = this
let val = 'cartList[' + index + '].num'
that.setData({
[val]: item.num + 1
})
this.computed()
},
// 清空购物车
clearCart() {
const that = this
wx.showModal({
title: '提示',
content: '清空购物车？',
success: function (res) {
if (res.confirm) {
that.setData({
cartList: []
})
that.foodsList.forEach((item, i) => {
item.list.forEach((itm, j) => {
let value = 'foodsList[' + i + '].list[' + j + '].num'
that.setData({
[value]: 0
})
})
})
that.computed()
}
}
})
},
// 计算选择商品总价格和总数量
computed() {
const that = this
let num = 0
let money = 0
that.cartList.forEach(item => {
num += item.num
money += parseFloat(item.price) * item.num
})
that.setData({
totalNum: num,
totalMoney: money
})
},
// 将数量为0的时候，对应商品在购物车中删除
removeAarry(arr, id) {
arr.forEach((item, index) => {
if (item.id === id) {
arr.splice(index, 1)
}
})
return arr
},
showCartMask() {
this.isShowCartMask = !this.isShowCartMask
},
hiddenCartMak() {
this.isShowCartMask = false
},
stopMaopao() {
},
showGoodDetail(item) {
this.goodDetail = item
this.isShowDetail = true
},
hideDetail() {
this.isShowDetail = false
},
// 订单提交
submitOrder() {
}
}
})
3.css
<style lang='scss'>
@import '../../style/base.scss';
page {
height: 100%;
}
.container {
height: 100vh;
background-color: #fff;
box-sizing: border-box;
overflow: hidden;
.dialog1{
width: 100%;
height: 100vh;
position: fixed;
top: 0;
left: 0;
background-color: rgba(0,0,0, 0.5);
z-index: 4;
.detbox{
position: fixed;
bottom: 0;
left: 0;
right: 0;
background-color: #fff;
width: 100%;
max-height: 700rpx;
overflow-y: auto;
color: #333;
border-radius: 40rpx 40rpx 0 0;
.img{
width: 100%;
height: 375rpx;
background: rgba(0,0,0,0.6);
}
.box{
padding: 20rpx 30rpx 40rpx;
box-sizing: border-box;
.tit{
font-size: 28rpx;
color: #333;
font-weight: bold;
}
.money{
font-size: 26rpx;
color: #f00;
margin: 10rpx 0;
}
.desc{
font-size: 22rpx;
color: #666;
line-height: 32rpx;
}
}
.close{
width: 50rpx;
height: 50rpx;
position: absolute;
right: 20rpx;
top: 20rpx;
display: flex;
align-items: center;
justify-content: center;
image{
width: 40rpx;
height: 40rpx;
}
}
}
}
.dialog{
width: 100%;
height: 100vh;
position: fixed;
top: 0;
left: 0;
background-color: rgba(0,0,0, 0.5);
z-index: 2;
.boxs{
position: fixed;
bottom: 80rpx;
left: 0;
right: 0;
z-index: 6;
background-color: #fff;
width: 100%;
max-height: 600rpx;
color: #333;
.title-block{
padding: 0 30rpx;
box-sizing: border-box;
display: flex;
align-items: center;
justify-content: space-between;
height: 70rpx;
background: #EEF0F1;
text{
font-size: 26rpx;
color: #666;
}
.clear{
font-size: 22rpx;
color: #888;
display: flex;
align-items: center;
image{
width: 24rpx;
height: 24rpx;
margin-right: 10rpx;
}
}
}
.content{
width: 100%;
max-height: 530rpx;
overflow-y: auto;
padding-bottom: 30rpx;
box-sizing: border-box;
.item{
width: 690rpx;
height: 80rpx;
line-height: 80rpx;
margin: 0 auto;
position: relative;
display: flex;
align-items: center;
justify-content: space-between;
&::after{
position: absolute;
width: 100%;
height: 1rpx;
background: #f2f2f2;
content: '';
bottom: 1rpx;
left: 0;
}
.tit{
width: 400rpx;
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
font-size: 28rpx;
color: #333;
}
.right{
display: flex;
justify-content: flex-start;
align-items: center;
height: 80rpx;
text{
font-size: 26rpx;
color: #f00;
}
.box{
display: flex;
justify-content: flex-start;
align-items: center;
flex-wrap: nowrap;
margin-left: 20rpx;
height: 80rpx;
.icon{
width: 34rpx;
height: 34rpx;
display: flex;
align-items: center;
justify-content: center;
image{
width: 34rpx;
height: 34rpx;
}
}
input{
width: 60rpx;
height: 34rpx;
border: none;
color: #333;
text-align: center;
font-size: 26rpx;
}
}
}
}
}
}
}
.index-cont{
height: calc(100vh - 80rpx);
display: flex;
justify-content: space-between;
.index-left{
width: 160rpx;
height: 100%;
background: #efefef;
.item{
font-size: 26rpx;
color: #333;
border-bottom: 1rpx dashed #666;
height: 80rpx;
line-height: 80rpx;
padding: 0 20rpx;
box-sizing: border-box;
&.on{
background: #fff;
}
}
}
.index-right{
width: 590rpx;
height: 100%;
.boxs{
padding: 0 30rpx;
box-sizing: border-box;
width: 100%;
}
.index-title{
height: 70rpx;
line-height: 70rpx;
background: #f7f7f7;
padding-left: 30rpx;
font-size: 26rpx;
color: #666;
box-sizing: border-box;
}
.item{
padding: 30rpx 0;
box-sizing: border-box;
display: flex;
justify-content: space-between;
position: relative;
height: 212rpx;
&::after{
position: absolute;
top: 0rpx;
left: 0;
background: #ccc;
width: 100%;
height: 1rpx;
content: '';
}
.pic{
width: 150rpx;
height: 150rpx;
image{
width: 100%;
height: 100%;
}
}
.main{
width: 380rpx;
padding-left: 30rpx;
box-sizing: border-box;
.tit{
font-size: 26rpx;
color: #333;
font-weight: bold;
}
.desc{
font-size: 22rpx;
color: #999;
line-height: 30rpx;
margin: 5rpx 0 10rpx;
min-height: 65rpx;
}
.money{
font-size: 28rpx;
color: #f00;
}
}
.box{
display: flex;
justify-content: flex-start;
align-items: center;
flex-wrap: nowrap;
margin-left: 10rpx;
height: 34rpx;
position: absolute;
right: 0;
bottom: 30rpx;
.icon{
width: 34rpx;
height: 34rpx;
display: flex;
align-items: center;
justify-content: center;
image{
width: 34rpx;
height: 34rpx;
}
}
input{
width: 60rpx;
height: 34rpx;
border: none;
color: #333;
text-align: center;
font-size: 26rpx;
}
}
}
}
}
.index-cart{
width: 100%;
height: 80rpx;
display: flex;
align-items: center;
justify-content: flex-start;
position: relative;
z-index: 3;
.left{
width: 470rpx;
height: 100%;
background: #3e3a39;
display: flex;
align-items: center;
justify-content: flex-start;
.cart-num{
width: 100rpx;
height: 100rpx;
background: #6E6D6C;
position: relative;
padding:25rpx;
box-sizing: border-box;
border-radius: 100%;
top: -30rpx;
left: 22rpx;
&.on{
background: $base-color;
}
image{
width: 50rpx;
height: 50rpx;
}
text{
font-size: 20rpx;
color: #fff;
display: inline-block;
padding: 0 9rpx;
box-sizing: border-box;
position: absolute;
right: 3rpx;
top: -3rpx;
height: 30rpx;
line-height: 30rpx;
border-radius: 30rpx;
background: #f00;
}
}
.cart-money{
color: #fff;
font-size: 30rpx;
margin-left: 50rpx;
}
}
.order-btn{
width: 280rpx;
height: 100%;
background: $base-color;
font-size: 28rpx;
color: #fff;
display: flex;
align-items: center;
justify-content: center;
}
}
}
4.ps
小程序使用mpx为框架；
商品列表数据根据接口获取，测试数据可以根据mock数据测试
实际数据类型是
goodLists: [
{
id: 'xx',
name: 'xx', // 商品类型
list: [ // 当前商品类型对应的所有商品
{
id: 'xx',
title: 'xx'，
pic: 'xx',
price: 'xx',
detail: 'xx',
num: '' // num是为了我方便对商品加减操作，让后端加的
}
]
}
]
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。