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微信小程序商城开发之实现商品加入购物车的功能(代码)

yuyutoo 2024-10-13 09:13 17 浏览 0 评论

本篇文章给大家带来的内容是关于微信小程序商城开发之实现商品加入购物车的功能（代码），有一定的参考价值，有需要的朋友可以参考一下，希望对你有所帮助。

看效果

购物车.gif

开发计划

1、商品详情页将商品信息放入缓存

2、购物车页面读取缓存获取商品信息

3、购物车商品计算和删除缓存商品

一、商品详情页将商品信息放入缓存

detail.wxml

<button data-goodid="{{goods.goodsId}}" class="button-addCar" bindtap="addCar" formType="submit">确定</button>

绑定bindtap事件将商品加入购物车。

detail.js

/**
 * 加入购物车
 */
 addCar: function (e) { 
 var goods = this.data.goods;
 goods.isSelect=false; 
 var count = this.data.goods.count; 
 var title = this.data.goods.title; 
 if (title.length > 13) {
 goods.title = title.substring(0, 13) + '...';
 } 
 // 获取购物车的缓存数组（没有数据，则赋予一个空数组） 
 var arr = wx.getStorageSync('cart') || []; 
 console.log("arr,{}", arr); 
 if (arr.length > 0) { 
 // 遍历购物车数组 
 for (var j in arr) { 
 // 判断购物车内的item的id，和事件传递过来的id，是否相等 
 if (arr[j].goodsId == goodsId) { 
 // 相等的话，给count+1（即再次添加入购物车，数量+1） 
 arr[j].count = arr[j].count + 1; 
 // 最后，把购物车数据，存放入缓存（此处不用再给购物车数组push元素进去，因为这个是购物车有的，直接更新当前数组即可） 
 try {
 wx.setStorageSync('cart', arr)
 } catch (e) { 
 console.log(e)
 } 
 //关闭窗口
 wx.showToast({ 
 title: '加入购物车成功！', 
 icon: 'success', 
 duration: 2000
 }); 
 this.closeDialog(); 
 // 返回（在if内使用return，跳出循环节约运算，节约性能） 
 return;
 }
 } 
 // 遍历完购物车后，没有对应的item项，把goodslist的当前项放入购物车数组 
 arr.push(goods);
 } else {
 arr.push(goods);
 } 
 // 最后，把购物车数据，存放入缓存 
 try {
 wx.setStorageSync('cart', arr) 
 // 返回（在if内使用return，跳出循环节约运算，节约性能） 
 //关闭窗口
 wx.showToast({ 
 title: '加入购物车成功！', 
 icon: 'success', 
 duration: 2000
 }); 
 this.closeDialog(); 
 return;
 } catch (e) { 
 console.log(e)
 }
 }

二、购物车页面读取缓存获取商品信息

cart.wxml

<view class="J-shopping-cart-empty" hidden="{{iscart}}"><view class="shopping-cart-empty">
 <view class="bg"></view> 
 <view class="cart"></view>
 <text class='empty-text'>购物车空空如也</text> 
 <p></p>
 <navigator url="/pages/goods/goods">
 <a href="//m.vip.com" class="button button-primary" >
 去抢购 </a>
 </navigator>
 </view></view> <view class="scroll" hidden="{{hidden}}"><scroll-view class="scroll" scroll-y="true">
 <view class="separate"></view>
 <view wx:for="{{carts}}">
 <view class="cart_container"> 
 <view wx:if="{{!item.isSelect}}">
 <icon class="item-select" bindtap="switchSelect" data-index="{{index}}" data-id="{{index}}" type="circle" size="20"></icon>
 </view>
 <view wx:elif="{{item.isSelect}}">
 <icon class="item-select" bindtap="switchSelect" data-index="{{index}}" data-id="{{index}}" type="success" color="#f0145a" size="20"></icon>
 </view>
 <image class="item-image" src="{{item.imgUrl}}"></image>
 <import src="../template/template.wxml" />
 <view class="column">
 <text class="title">{{item.title}}</text>
 <image bindtap="delGoods" id="img{{index}}" data-index="{{index}}" src="../../images/del.png"></image> 
 <view class="row">
 <text class="sku-price">￥{{item.price * item.count}}</text>
 <view class="sku">
 <template is="quantity" data="{{ ...item,index:index}}" /> 
 </view>
 </view>
 </view>
 </view>
 <view class="separate"></view>
 </view></scroll-view></view>
 <view class="bottom_total" hidden="{{hidden}}">
 <view class="bottom_line"></view>
 <view class="row">
 <view wx:if="{{!isAllSelect}}">
 <icon class="item-allselect" bindtap="allSelect" type="circle" size="20"></icon>
 </view>
 <view wx:elif="{{isAllSelect}}">
 <icon class="item-allselect" bindtap="allSelect" type="success" color="#f0145a" size="20"></icon>
 </view>
 <text class="small_text">全选</text>
 <text>合计:￥ </text>
 <text class="price">{{totalMoney}}</text>
 <button class="button-red" bindtap="toBuy" formType="submit">去结算 </button>
 </view></view>

cart.wxss

 @import "../template/template.wxss"; 
page{ 
 background: #f3f4f5; 
 /* font-size: 37.5px; */
} 
 .column image { 
 width:33rpx; 
 height:35rpx; 
 display:inline-block; 
 overflow:hidden; 
 float:right; 
 margin-top: -40rpx; 
 margin-left:400rpx;
} 
 .J-shopping-cart-empty{ 
 margin: 0; 
 padding: 0; 
 border: 0; 
 font: inherit; 
 font-size: 100%; 
 vertical-align: baseline;
}
.shopping-cart-empty { 
 height: 250px; 
 padding-top: 3.2rem; 
 padding-bottom: 1.6rem; 
 background-color: #fff; 
 text-align: center; 
 position: relative;
} 
.shopping-cart-empty .bg{ 
 position: absolute; 
 width: 16.29333rem; 
 height: 6.73333rem; 
 
 background: transparent url(data:image/png;base64,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); 
 left: 50%; 
 -webkit-transform: translateX(-50%); 
 transform: translateX(-50%); 
 background-size: 100%; 
 top: 0;
} 
.shopping-cart-empty .cart{ 
 width: 5.83333rem; 
 height: 7.46rem; 
 background: transparent url(data:image/png;base64,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) no-repeat; 
 background-size: 100%; 
 margin: 0 auto;
} 
.shopping-cart-empty .button { 
 width: 8.46667rem; 
 height: 1.5rem; 
 display: block; 
 margin: 20rpx auto;
}
.empty-text { 
 font-size: .64667rem; 
 color: #222; 
 margin-top: .53333rem; 
 line-height: .74667rem; 
 font-weight: 400;
}
.button-primary { 
 border: 1px solid #de3c96; 
 color: #de3c96; 
 text-decoration: none; 
 text-align: center; 
 display: block; 
 border-radius: .21267rem; 
 line-height: 1.5rem; 
 -webkit-appearance: none; 
 background: none; 
 padding: 0 .26667rem; 
 margin: 0; 
 white-space: nowrap; 
 position: relative; 
 text-overflow: ellipsis; 
 font-size: .74333rem; 
 font-family: inherit; 
 cursor: pointer; 
 user-select: none;
} 
.cart_container { 
 display: flex; 
 flex-direction: row; 
 background-color: #FFFFFF; 
 margin-bottom: 10rpx;
}
.scroll { 
 margin-bottom: 120rpx; 
}
.column { 
 display: flex; 
 flex-direction: column;
}
.row { 
 display: flex; 
 flex-direction: row; 
 align-items: center;
}
.sku { 
 margin-left: 100rpx; 
 position: absolute; 
 right: 30rpx; 
 margin-top: 30rpx; 
}
.sku-price { 
 color: red; 
 position: relative; 
 margin-top: 30rpx; 
}
.price { 
 color: red; 
 position: relative;
}
.title { 
 font-size: 32rpx; 
 margin-top: 40rpx;
}
.small_text { 
 font-size: 28rpx; 
 margin-right: 40rpx; 
 margin-left: 25rpx;
}
.item-select { 
 width: 40rpx; 
 height: 40rpx; 
 margin-top: 90rpx; 
 margin-left: 20rpx;
}
.item-allselect { 
 width: 40rpx; 
 height: 40rpx; 
 margin-left: 20rpx; 
 margin-top:25rpx; 
}
.item-image { 
 width: 180rpx; 
 height: 180rpx; 
 margin: 20rpx;
} 
.bottom_line { 
 width: 100%; 
 height: 2rpx; 
 background: lightgray;
} 
.bottom_total { 
 position: fixed; 
 display: flex; 
 flex-direction: column; 
 bottom: 0; 
 width: 100%; 
 height: 120rpx; 
 line-height: 120rpx; 
 background: white; /* margin-top: 300rpx; */
 border-top: 1rpx solid #ccc; z-index: 99;
}
.button-red { 
 background-color: #f0145a; 
 position: fixed; 
 right: 0; 
 color: white; 
 text-align: center; 
 display: inline-block; 
 font-size: 30rpx; 
 border-radius: 0rpx; 
 width: 30%; 
 height: 120rpx; 
 line-height: 120rpx; /* border: 1rpx solid #ccc; */
}

cart.js

/**
 * 页面的初始数据
 */
 data: { 
 carts: [], //数据 
 iscart: false, 
 hidden: null, 
 isAllSelect: false, 
 totalMoney: 0,
 },
onShow: function () { 
 // 获取产品展示页保存的缓存数据（购物车的缓存数组，没有数据，则赋予一个空数组） 
 var arr = wx.getStorageSync('cart') || []; 
 console.info("缓存数据："+arr); // 有数据的话，就遍历数据，计算总金额 和 总数量 
 if (arr.length > 0) { 
 // 更新数据 
 this.setData({ 
 carts: arr, 
 iscart: true, 
 hidden: false
 }); 
 console.info("缓存数据：" + this.data.carts);
 }else{ 
 this.setData({ 
 iscart: false, 
 hidden: true,
 });
 }
 },

三、购物车商品计算和删除缓存商品

cart.js

//勾选事件处理函数 
 switchSelect: function (e) { 
 // 获取item项的id，和数组的下标值 
 var Allprice = 0, i = 0; 
 let id = e.target.dataset.id,
 index = parseInt(e.target.dataset.index); 
 this.data.carts[index].isSelect = !this.data.carts[index].isSelect; //价钱统计
 if (this.data.carts[index].isSelect) { 
 this.data.totalMoney = this.data.totalMoney + (this.data.carts[index].price * this.data.carts[index].count);
 } else { 
 this.data.totalMoney = this.data.totalMoney - (this.data.carts[index].price * this.data.carts[index].count);
 } 
 //是否全选判断
 for (i = 0; i < this.data.carts.length; i++) {
 Allprice = Allprice + (this.data.carts[index].price * this.data.carts[index].count);
 } 
 if (Allprice == this.data.totalMoney) { 
 this.data.isAllSelect = true;
 } else { 
 this.data.isAllSelect = false;
 } 
 this.setData({ 
 carts: this.data.carts, 
 totalMoney: this.data.totalMoney, 
 isAllSelect: this.data.isAllSelect,
 })
 }, 
 //全选
 allSelect: function (e) { 
 //处理全选逻辑
 let i = 0; 
 if (!this.data.isAllSelect) { 
 this.data.totalMoney = 0; 
 for (i = 0; i < this.data.carts.length; i++) { 
 this.data.carts[i].isSelect = true; 
 this.data.totalMoney = this.data.totalMoney + (this.data.carts[i].price * this.data.carts[i].count);
 }
 } else { 
 for (i = 0; i < this.data.carts.length; i++) { 
 this.data.carts[i].isSelect = false;
 } 
 this.data.totalMoney = 0;
 } 
 this.setData({ 
 carts: this.data.carts, 
 isAllSelect: !this.data.isAllSelect, 
 totalMoney: this.data.totalMoney,
 })
 }, // 去结算
 toBuy() {
 wx.showToast({ 
 title: '去结算', 
 icon: 'success', 
 duration: 3000
 }); 
 this.setData({ 
 showDialog: !this.data.showDialog
 });
 }, //数量变化处理
 handleQuantityChange(e) { 
 var componentId = e.componentId; 
 var quantity = e.quantity; 
 this.data.carts[componentId].count.quantity = quantity; 
 this.setData({ 
 carts: this.data.carts,
 });
 }, 
 /* 减数 */
 delCount: function (e) { 
 var index = e.target.dataset.index; 
 console.log("刚刚您点击了加一"); 
 var count = this.data.carts[index].count; // 商品总数量-1
 if (count > 1) { 
 this.data.carts[index].count--;
 } 
 // 将数值与状态写回 
 this.setData({ 
 carts: this.data.carts
 }); 
 console.log("carts:" + this.data.carts); 
 this.priceCount();
 }, 
 /* 加数 */
 addCount: function (e) { 
 var index = e.target.dataset.index; 
 console.log("刚刚您点击了加+"); 
 var count = this.data.carts[index].count; // 商品总数量+1 
 if (count < 10) { 
 this.data.carts[index].count++;
 } 
 // 将数值与状态写回 
 this.setData({ 
 carts: this.data.carts
 }); 
 console.log("carts:" + this.data.carts); 
 this.priceCount();
 }, 
 priceCount: function (e) { 
 this.data.totalMoney = 0; 
 for (var i = 0; i < this.data.carts.length; i++) { 
 if (this.data.carts[i].isSelect == true) { 
 this.data.totalMoney = this.data.totalMoney + (this.data.carts[i].price * this.data.carts[i].count);
 }
 } 
 this.setData({ 
 totalMoney: this.data.totalMoney,
 })
 }, 
 /* 删除item */
 delGoods: function (e) { 
 this.data.carts.splice(e.target.id.substring(3),1); // 更新data数据对象 
 if (this.data.carts.length > 0) { 
 this.setData({ 
 carts: this.data.carts
 })
 wx.setStorageSync('cart', this.data.carts); 
 this.priceCount();
 } else { 
 this.setData({ 
 cart: this.data.carts, 
 iscart: false, 
 hidden: true,
 })
 wx.setStorageSync('cart', []);
 }
 }

微信小程序商城开发之实现商品加入购物车的功能(代码)

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