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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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

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！',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


         
        
        购物车空空如也  
        
        
         
            去抢购        
        
     
  
  
      
      
            
      
      
            
      
  <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  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>

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;

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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,// 去结算

toBuy() {

wx.showToast({

title: '去结算',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,})

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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