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微信小程序实现简单购物车小功能

本文实例为大家分享了微信小程序实现简单购物车的具体代码,供大家参考,具体内容如下

微信小程序定制好看的购物车页面,实现购物车功能,希望对您有所帮助!

1. 应用场景
2. 思路分析
3. 代码分析
4. 具体实现代码

效果截图:

1.应用场景

适用于商城、秒杀、商品购买等类型的小程序,负责将顾客浏览的商品保存下来,方便客户集中比较商品与购买商品。

2.思路分析

实现购物车功能前请思考以下问题:

1.小程序如何布局?使用什么布局能提升页面开发效率??

2.将购物车功能分为四个小功能:(1)一键全选/取消商品 (2)动态添加商品可手动输入 (3)计算结算商品金额 (4)左滑动删除商品

答:(1)在小程序中主要是兼容安卓与ios两种型号手机,在页面开发中可使用flex布局,能极大的提高页面的开发效率。(2)请仔细阅读代码分析,看懂自己也可轻松实现购物车功能 so easy!!!

3.代码分析

1. 一键全选/取消

allSelect: function (e) {
? ? var that = this
? ? var allSelect = e.currentTarget.dataset.select//判断是否选中 circle是 success否
? ? var newList = that.data.slideProductList
? ? if (allSelect == "circle") {
? ? ? for (var i = 0; i < newList.length; i++) {
? ? ? ? newList[i].select = "success"
? ? ? }
? ? ? var select = "success"
? ? } else {
? ? ? for (var i = 0; i < newList.length; i++) {
? ? ? ? newList[i].select = "circle"
? ? ? }
? ? ? var select = "circle"
? ? }
? ? that.setData({
? ? ? slideProductList: newList,
? ? ? allSelect: select
? ? })
? ? that.countNum()//计算商品数量
? ? that.count()//计算商品金额
? },

2. 动态添加商品可手动输入

a 添加商品

addtion: function (e) {//添加商品
? ? var that = this
? ? var index = e.currentTarget.dataset.index
? ? var num = e.currentTarget.dataset.num
? ? if (num < 99) { //默认峰值99件
? ? ? num++
? ? }
? ? var newList = that.data.slideProductList
? ? newList[index].num = num
? ? that.setData({
? ? ? goodsNum:num,
? ? ? slideProductList: newList
? ? })
? ? that.countNum()
? ? that.count()
? },

b 减少商品

subtraction: function (e) {//减少商品
? ? var that = this
? ? var index = e.currentTarget.dataset.index
? ? var num = e.currentTarget.dataset.num
? ? var newList = that.data.slideProductList
? ? //当1件时,再次点击移除该商品
? ? if (num == 1) {
? ? ? newList.splice(index, 1)
? ? } else {
? ? ? num--
? ? ? newList[index].num = num
? ? }
? ? that.setData({
? ? ? goodsNum: num,
? ? ? slideProductList: newList
? ? })
? ? that.countNum()
? ? that.count()
? },

c 直接输入

inputNum:function(e){
? ? var num = e.detail.value;
? ? this.setData({goodsNum:num})
? },
? numIputBlur:function(e){
? ? var that = this;
? ? var num = that.data.goodsNum;
? ? var index = e.currentTarget.dataset.index;
? ? var newList = that.data.slideProductList
? ? if (num == "") { //判空
? ? ? newList[index].num = 1;
? ? ? that.setData({
? ? ? ? slideProductList: newList
? ? ? })
? ? }else if (num < 1) {
? ? ? that.setData({
? ? ? ? goodsNum: newList[index].num,
? ? ? ? slideProductList: newList
? ? ? })
? ? ? wx.showToast({
? ? ? ? title: '亲,该宝贝不能减少了哦~',
? ? ? ? icon: 'none'
? ? ? })
? ? }else if(num>99){
? ? ? that.setData({
? ? ? ? goodsNum: newList[index].num,
? ? ? ? slideProductList: newList
? ? ? })
? ? ? wx.showToast({
? ? ? ? title: '亲,该宝贝最多购买99件哦~',
? ? ? ? icon: 'none'
? ? ? })
? ? }else{
? ? ? newList[index].num = num;
? ? ? that.setData({
? ? ? ? slideProductList: newList
? ? ? })
? ? }
? ? that.countNum()
? ? that.count()
? },

3. 计算结算商品金额

count: function () {//计算金额方法
? ? var that = this
? ? var newList = that.data.slideProductList
? ? var newCount = 0
? ? for (var i = 0; i < newList.length; i++) {
? ? ? if (newList[i].select == "success") {
? ? ? ? newCount += newList[i].num * newList[i].price
? ? ? }
? ? }
? ? that.setData({
? ? ? count: newCount
? ? })
? }, 

4. 页面左滑动删除商品

功能后续整理

4. 具体实现代码

1.wxml  

<view class="product-container">
?? ?<view class="product-list" style='height:{{height}}px'>
?? ??? ?<view class="product-item" wx:for="{{slideProductList}}" wx:for-index="index" wx:key='slideProductList'>
?? ??? ??? ?<slide-delete pid="{{item.id}}" bindaction="handleSlideDelete" wx:key='slideProductList'>
?? ??? ??? ??? ?<view class="product-item-wrap">
?? ??? ??? ??? ??? ?<icon type="{{item.select}}" size="19" data-index="{{index}}" data-select="{{item.select}}" bindtap="change" color="red" />
?? ??? ??? ??? ??? ?<view class="product_img">
?? ??? ??? ??? ??? ??? ?<image src="{{item.url}}" class='goods-img' mode="widthFix"></image>
?? ??? ??? ??? ??? ?</view>
?? ??? ??? ??? ??? ?<view class="product-movable-item">
?? ??? ??? ??? ??? ??? ?<view class="goods-name">{{item.name}}</view>
?? ??? ??? ??? ??? ??? ?<view class="goods-type">最新款
?? ??? ??? ??? ??? ??? ??? ?<text>{{item.style}}</text>
?? ??? ??? ??? ??? ??? ?</view>
?? ??? ??? ??? ??? ??? ?<view class="goods-price">¥{{item.price}}</view>
?? ??? ??? ??? ??? ?</view>
?? ??? ??? ??? ??? ?<view class="product-movable-item product-movable-item-amount">
?? ??? ??? ??? ??? ??? ?<view class="num-box">
?? ??? ??? ??? ??? ??? ??? ?<view class="btn-groups">
?? ??? ??? ??? ??? ??? ??? ??? ?<button class="goods-btn btn-minus" data-index="{{index}}" data-num="{{item.num}}" bindtap="subtraction">—</button>
?? ??? ??? ??? ??? ??? ??? ??? ?<input class='num' type='number' data-index="{{index}}" bindblur="numIputBlur" bindinput='inputNum' value='{{item.num}}'></input>
?? ??? ??? ??? ??? ??? ??? ??? ?<button class="goods-btn btn-add" data-index="{{index}}" data-num="{{item.num}}" bindtap="addtion">+</button>
?? ??? ??? ??? ??? ??? ??? ?</view>
?? ??? ??? ??? ??? ??? ?</view>
?? ??? ??? ??? ??? ?</view>
?? ??? ??? ??? ?</view>
?? ??? ??? ?</slide-delete>
?? ??? ?</view>
?? ?</view>
?? ?<view class="cart-fixbar">
?? ??? ?<view class="allSelect">
?? ??? ??? ?<icon type="{{allSelect}}" size="19" data-select="{{allSelect}}" bindtap="allSelect" color='#fff' />
?? ??? ??? ?<view class="allSelect-text">全选</view>
?? ??? ?</view>
?? ??? ?<view class="count">
?? ??? ??? ?<text>合计:</text>¥{{count}}
?? ??? ?</view>
?? ??? ?<view class="order">
?? ??? ??? ?<view class="orders">
?? ??? ??? ??? ?去结算
?? ??? ??? ??? ?<text class="allnum">({{num}})</text>
?? ??? ??? ?</view>

?? ??? ?</view>
?? ?</view>
</view>
<view class="footer">
?? ?<navigator class="ft_item" url="shoping/shoping" hover-class="none" open-type='redirect'>
?? ??? ?<image src="image/sy_1.png"></image>
?? ??? ?<view class="item_title">首页</view>
?? ?</navigator>
?? ?<navigator url="classification/classification" hover-class="none" open-type='redirect' class="ft_item">
?? ??? ?<image src="image/fl_1.png"></image>
?? ??? ?<view class="item_title">分类</view>
?? ?</navigator>
?? ?<view class="ft_item">
?? ??? ?<image src="image/gwc.png"></image>
?? ??? ?<view class="item_title">购物车</view>
?? ?</view>
?? ?<navigator hover-class="none" url="my/my" open-type='redirect' class="ft_item">
?? ??? ?<image src="image/gr_1.png"></image>
?? ??? ?<view class="item_title">我的</view>
?? ?</navigator>
</view>

2.js

const app = getApp()
Page({

? /**
? ?* 页面的初始数据
? ?*/
? data: {
? ? goodsNum:'',
? ? userInfo: {},
? ? hasUserInfo: false,
? ? canIUse: wx.canIUse('button.open-type.getUserInfo'),

? ? slideProductList: [
? ? ? {
? ? ? ? id:1,
? ? ? ? name: '智能手环1111111112222211',
? ? ? ? url: "image/bracelet.jpg",
? ? ? ? style: "2代",
? ? ? ? price: "149.5",
? ? ? ? select: "circle",
? ? ? ? num: "1",
? ? ? ? code: "0001",
? ? ? ? amount: 500
? ? ? },
? ? ? {
? ? ? ? id: 2,
? ? ? ? name: "指环支架",
? ? ? ? url: "image/ring.jpg",
? ? ? ? style: "金色",
? ? ? ? price: "19.9",
? ? ? ? select: "circle",
? ? ? ? code: "0002",
? ? ? ? num: "1",
? ? ? ? amount: 500
? ? ? },
? ? ? {
? ? ? ? id: 3,
? ? ? ? name: "新款平板电脑",
? ? ? ? url: "image/iphone.png",
? ? ? ? style: "9.7英寸",
? ? ? ? price: "100",
? ? ? ? select: "circle",
? ? ? ? code: "0003",
? ? ? ? num: "1",
? ? ? ? amount: 110
? ? ? },
? ? ? {
? ? ? ? id: 4,
? ? ? ? code: "0001",
? ? ? ? name: "无人机",
? ? ? ? url: "image/uav.jpg",
? ? ? ? style: "低配版",
? ? ? ? price: "4999",
? ? ? ? select: "circle",
? ? ? ? code: "0004",
? ? ? ? num: "1",
? ? ? ? amount: 200
? ? ? },
? ? ? {
? ? ? ? id: 5,
? ? ? ? code: "0001",
? ? ? ? name: "无人机",
? ? ? ? url: "image/uav.jpg",
? ? ? ? style: "低配版",
? ? ? ? price: "4999",
? ? ? ? select: "circle",
? ? ? ? code: "0004",
? ? ? ? num: "1",
? ? ? ? amount: 200
? ? ? },
? ? ? {
? ? ? ? id: 6,
? ? ? ? code: "0001",
? ? ? ? name: "无人机",
? ? ? ? url: "image/uav.jpg",
? ? ? ? style: "低配版",
? ? ? ? price: "4999",
? ? ? ? select: "circle",
? ? ? ? code: "0004",
? ? ? ? num: "1",
? ? ? ? amount: 200
? ? ? },
? ? ],
? ? allSelect: "circle",
? ? num: 0,
? ? count: 0,
? ? lastX: 0,
? ? lastY: 0,
? ? text: "没有滑动",

? ?
? },

? change: function (e) {
? ? var that = this
? ? var index = e.currentTarget.dataset.index
? ? var select = e.currentTarget.dataset.select

? ? if (select == "circle") {
? ? ? var stype = "success"
? ? } else {
? ? ? var stype = "circle"
? ? }
? ? var newList = that.data.slideProductList
? ? newList[index].select = stype
? ? that.setData({
? ? ? slideProductList: newList
? ? })
? ? that.countNum()
? ? that.count()
? },
? addtion: function (e) {
? ? var that = this
? ? var index = e.currentTarget.dataset.index
? ? var num = e.currentTarget.dataset.num
? ? //默认99件
? ? if (num < 99) {
? ? ? num++
? ? }
? ? var newList = that.data.slideProductList
? ? newList[index].num = num
? ? that.setData({
? ? ? goodsNum:num,
? ? ? slideProductList: newList
? ? })
? ? that.countNum()
? ? that.count()
? },
? inputNum:function(e){
? ? var num = e.detail.value;
? ? this.setData({
? ? ? goodsNum:num
? ? })
? },
? numIputBlur:function(e){
? ? var that = this
? ? var num = that.data.goodsNum
? ? var index = e.currentTarget.dataset.index
? ? var newList = that.data.slideProductList
? ? if (num == "") { //盘空
? ? ? newList[index].num = 1;
? ? ? that.setData({
? ? ? ? slideProductList: newList
? ? ? })
? ? }else if (num < 1) {
? ? ? that.setData({
? ? ? ? goodsNum: newList[index].num,
? ? ? ? slideProductList: newList
? ? ? })
? ? ? wx.showToast({
? ? ? ? title: '亲,该宝贝不能减少了哦~',
? ? ? ? icon: 'none'
? ? ? })
? ? }else if(num>99){
? ? ??
? ? ? that.setData({
? ? ? ? goodsNum: newList[index].num,
? ? ? ? slideProductList: newList
? ? ? })
? ? ? wx.showToast({
? ? ? ? title: '亲,该宝贝最多购买99件哦~',
? ? ? ? icon: 'none'
? ? ? })
? ? }else{
? ? ? newList[index].num = num;
? ? ? that.setData({
? ? ? ? slideProductList: newList
? ? ? })
? ? }
? ? that.countNum()
? ? that.count()
? },
? //减法
? subtraction: function (e) {
? ? var that = this
? ? var index = e.currentTarget.dataset.index
? ? var num = e.currentTarget.dataset.num
? ? var newList = that.data.slideProductList
? ??
? ? if (num == 1) {//当数量为1件时,再次点击移除该商品
? ? ? newList.splice(index, 1)
? ? } else {
? ? ? num--
? ? ? newList[index].num = num
? ? }
? ? that.setData({
? ? ? goodsNum: num,
? ? ? slideProductList: newList
? ? })
? ? that.countNum()
? ? that.count()
? },
? //全选
? allSelect: function (e) {
? ? var that = this
? ? var allSelect = e.currentTarget.dataset.select //先判断是否选中
? ? var newList = that.data.slideProductList
? ? console.log(newList)
? ? if (allSelect == "circle") {
? ? ? for (var i = 0; i < newList.length; i++) {
? ? ? ? newList[i].select = "success"
? ? ? }
? ? ? var select = "success"
? ? } else {
? ? ? for (var i = 0; i < newList.length; i++) {
? ? ? ? newList[i].select = "circle"
? ? ? }
? ? ? var select = "circle"
? ? }
? ? that.setData({
? ? ? slideProductList: newList,
? ? ? allSelect: select
? ? })
? ? that.countNum()
? ? that.count()
? },
?
? countNum: function () { //计算数量
? ? var that = this
? ? var newList = that.data.slideProductList
? ? var allNum = 0
? ? for (var i = 0; i < newList.length; i++) {
? ? ? if (newList[i].select == "success") {
? ? ? ? allNum += parseInt(newList[i].num)
? ? ? }
? ? }
? ? parseInt
? ? that.setData({
? ? ? num: allNum
? ? })
? },
??
? count: function () {//计算金额方法
? ? var that = this
? ? var newList = that.data.slideProductList
? ? var newCount = 0
? ? for (var i = 0; i < newList.length; i++) {
? ? ? if (newList[i].select == "success") {
? ? ? ? newCount += newList[i].num * newList[i].price
? ? ? }
? ? }
? ? that.setData({
? ? ? count: newCount
? ? })
? },

??

? /**
? ?* 生命周期函数--监听页面加载
? ?*/
? onLoad: function (options) {
? ? var width=wx.getSystemInfoSync().windowWidth
? ? var height=wx.getSystemInfoSync().windowHeight
? ? height=height-55-53;
? ? this.setData({
? ? ? height:height
? ? })
? },

? /**
? ?* 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 () {

? },

? /**
? ?* 页面上拉触底事件的处理函数
? ?*/
? onReachBottom: function () {

? },

? /**
? ?* 用户点击右上角分享
? ?*/
? onShareAppMessage: function () {

? }
})

3.wxss

.cart-box .item {display:flex;flex-direction:row;align-items:center;padding:20rpx;border-top:8rpx solid #f0f3fa;}
.cart-box .item .goods-info {margin-left:20rpx;}
.goods-img {width:160rpx;margin-left:20rpx;height:160rpx;}
.cart-box .row {color:#fff;display:flex;flex-direction:row;width:430rpx;justify-content:space-between;margin-bottom:10rpx;}
.goods-name {font-size:32rpx;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:#333;padding-bottom:10rpx;width:290rpx;}
.goods-price {font-size:32rpx;color:#e02e24;position:relative;top:14rpx;}
.goods-type {color:#999;font-size:24rpx;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;width:240rpx;padding-bottom:10rpx;}
.num-box {display:flex;flex-direction:row;justify-content:flex-end;position:relative;top:6rpx;}
.goods-btn {width:44rpx;height:44rpx;padding:0;line-height:40rpx;font-weight:400;color:#fff;margin:0;background:#e60a30;border-radius:50%;}
.num {color:#999;width:50rpx;margin-left:5rpx;margin-right:5rpx;text-align:center;line-height:50rpx;font-size:30rpx;}
.btn-add {font-size:36rpx;}
.btn-minus {font-size:18rpx;background:#f8babb;}
.btn-groups {display:flex;flex-direction:row;justify-content:flex-end;background:#f4f4f4;padding:2rpx;border-radius:10rpx;}
.cart-fixbar {position:fixed;bottom:113rpx;background:#e60a30;height:106rpx;width:95%;margin:0 20rpx;display:flex;flex-direction:row;align-items:center;border-top-left-radius:20rpx;border-top-right-radius:20rpx;}
.cart-box .item:last-child {border-bottom:8rpx solid #f0f3fa;}
.cart-fixbar .allSelect {display:flex;flex-direction:row;height:106rpx;align-items:center;color:#fff;font-size:32rpx;margin-left:20rpx;}
.cart-fixbar .allSelect-text {margin-left:16rpx;font-size:28rpx;}
.cart-fixbar .count {color:#fff;font-size:36rpx;position:absolute;right:220rpx;display:flex;align-items:center;}
.cart-fixbar .count text {font-size:28rpx;}
.cart-fixbar .order {color:#e02e24;height:58rpx;background:#fff;line-height:58rpx;position:absolute;right:0;margin:0 20rpx;font-size:28rpx;border-radius:10rpx;}
.cart-fixbar .orders {padding:0 18rpx;}
.cart-fixbar .allnum {font-size:28rpx;}
.row_boxs {display:flex;align-items:center;}
.goods-type {flex:1;}
.goods-type text {padding-right:10rpx;}
.section {padding-bottom:220rpx;}
.footer {border-top:1rpx solid #eee;position:fixed;bottom:0;width:100%;display:flex;background:#fff;font-size:24rpx;height:55px;align-items:center;}
.footer .ft_item {width:25%;text-align:center;}
.footer .ft_item image {width:44rpx;height:44rpx;margin-top:10rpx;}
.footer .ft_item:nth-child(3) .item_title {color:#e60a30;}
.section_img {width:110rpx;height:110rpx;}
.section_boxs {text-align:center;margin:50% auto 0;}
.cart-box_p,.section_p {text-align:center;font-size:26rpx;padding-top:10rpx;color:#999;}
.cart-box_p {padding-top:60rpx;}
.cart-box_p text {border:1rpx solid #eee;padding:10rpx 24rpx;letter-spacing:1rpx;}
.title {margin:60rpx 0 30rpx;font-size:40rpx;text-align:center;font-weight:bold;color:#383a3d;}
.product-list .product-item {position:relative;width:100vw;border-bottom:10rpx solid #f0f3fa;box-sizing:border-box;background:#fff;z-index:999;}
.slide-product-list .slide-product-item {position:relative;width:100vw;border-bottom:2rpx solid #e9e9e9;box-sizing:border-box;background:#fff;z-index:999;}
.product-list .product-item movable-area {height:120rpx;width:calc(100vw - 120rpx);}
.product-list .product-item movable-view {height:120rpx;width:100vw;background:#fff;z-index:999;}
.product-list .product-item:first-child {border-top:10rpx solid #f0f3fa;}
.product-list .product-item .delete-btn {position:absolute;top:0;bottom:0;right:0;width:120rpx;font-family:PingFangSC-Regular;font-size:24rpx;color:#fff;line-height:120rpx;z-index:1;background:#e66671;text-align:center;}
.product-list .product-item-wrap {position:relative;display:flex;align-items:center;padding:8rpx 0 20rpx 20rpx;box-sizing:border-box;}
.product-list .product-item-wrap .product-movable-item {flex:1;/* overflow:hidden;*/}
.product-list .product-item-wrap .product-movable-item-name {font-family:PingFangSC-Regular;font-size:28rpx;color:#71747a;line-height:60rpx;margin-right:10rpx;overflow:hidden;white-space:nowrap;text-overflow:ellipsis;}
.product-list .product-item-wrap .product-movable-item-code {font-family:PingFangSC-Regular;font-size:24rpx;color:#969aa3;}
.product-list .product-item-wrap .product-movable-item-amount {flex:1;padding-right:50rpx;position:relative;}
.product-list .product-item-wrap .product-movable-item-amount .amount {width:120rpx;font-size:28rpx;color:#383a3d;line-height:60rpx;}
.product-list .product-item-wrap .product-movable-item-amount .unit {position:absolute;top:0;right:30rpx;font-size:28rpx;color:#969aa3;line-height:60rpx;}
.product_img {display:flex;align-items:center;padding-right:20rpx;}
.product-list {display:block;overflow-y:auto;}

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