【愚公系列】2022年11月 微信小程序-优购电商项目-商品购物车页面

import { getSetting, chooseAddress, openSetting, showModal ,showToast} from "../../utils/asyncWx.js";

Page({
  data: {
    address: {},
    cart: [],
    allChecked: false,
    totalPrice: 0,
    totalNum: 0
  },
  onShow() {
    // 1 获取缓存中的收货地址信息
    const address = wx.getStorageSync("address");
    // 1 获取缓存中的购物车数据
    const cart = wx.getStorageSync("cart") || [];

    this.setData({ address });
    this.setCart(cart);

  },
  // 点击 收货地址
  async handleChooseAddress() {
    try {
      // 1 获取 权限状态
      const res1 = await getSetting();
      const scopeAddress = res1.authSetting["scope.address"];
      // 2 判断 权限状态
      if (scopeAddress === false) {
        await openSetting();
      }
      // 4 调用获取收货地址的 api
      let address = await chooseAddress();
      address.all = address.provinceName + address.cityName + address.countyName + address.detailInfo;

      // 5 存入到缓存中
      wx.setStorageSync("address", address);

    } catch (error) {
      console.log(error);
    }
  },
  // 商品的选中
  handeItemChange(e) {
    // 1 获取被修改的商品的id
    const goods_id = e.currentTarget.dataset.id;
    // 2 获取购物车数组 
    let { cart } = this.data;
    // 3 找到被修改的商品对象
    let index = cart.findIndex(v => v.goods_id === goods_id);
    // 4 选中状态取反
    cart[index].checked = !cart[index].checked;

    this.setCart(cart);

  },
  // 设置购物车状态同时 重新计算 底部工具栏的数据 全选 总价格 购买的数量
  setCart(cart) {
    let allChecked = true;
    // 1 总价格 总数量
    let totalPrice = 0;
    let totalNum = 0;
    cart.forEach(v => {
      if (v.checked) {
        totalPrice += v.num * v.goods_price;
        totalNum += v.num;
      } else {
        allChecked = false;
      }
    })
    // 判断数组是否为空
    allChecked = cart.length != 0 ? allChecked : false;
    this.setData({
      cart,
      totalPrice, totalNum, allChecked
    });
    wx.setStorageSync("cart", cart);
  },
  // 商品全选功能
  handleItemAllCheck() {
    // 1 获取data中的数据
    let { cart, allChecked } = this.data;
    // 2 修改值
    allChecked = !allChecked;
    // 3 循环修改cart数组 中的商品选中状态
    cart.forEach(v => v.checked = allChecked);
    // 4 把修改后的值 填充回data或者缓存中
    this.setCart(cart);
  },
  // 商品数量的编辑功能
  async handleItemNumEdit(e) {


    // 1 获取传递过来的参数 
    const { operation, id } = e.currentTarget.dataset;
    // 2 获取购物车数组
    let { cart } = this.data;
    // 3 找到需要修改的商品的索引
    const index = cart.findIndex(v => v.goods_id === id);
    // 4 判断是否要执行删除
    if (cart[index].num === 1 && operation === -1) {
      // 4.1 弹窗提示
      const res = await showModal({ content: "您是否要删除？" });
      if (res.confirm) {
        cart.splice(index, 1);
        this.setCart(cart);
      }
    } else {
      // 4  进行修改数量
      cart[index].num += operation;
      // 5 设置回缓存和data中
      this.setCart(cart);
    }
  },
  // 点击 结算 
  async handlePay(){
    // 1 判断收货地址
    const {address,totalNum}=this.data;
    if(!address.userName){
      await showToast({title:"您还没有选择收货地址"});
      return;
    }
    // 2 判断用户有没有选购商品
    if(totalNum===0){
      await showToast({title:"您还没有选购商品"});
      return ;
    }
    // 3 跳转到 支付页面
    wx.navigateTo({
      url: '/pages/pay/index'
    });
      
  }
})

<!-- 收货地址 -->
<view class="revice_address_row">
  <!-- 当收货地址 不存在 按钮显示  对象 空对象 bool类型也是true  -->
  <view class="address_btn" wx:if="{{!address.userName}}"  >
    <button bindtap="handleChooseAddress" type="primary"  plain  >获取收货地址</button>
  </view>
  <!-- 当收货地址 存在 详细信息就显示 -->
  <view wx:else  class="user_info_row" >
    <view class="user_info">
      <view>{{address.userName}}</view>
      <view>{{address.all}}</view>
    </view>
    <view class="user_phone">{{address.telNumber}}</view>
  </view>
</view>

<!-- 购物车内容 -->
<view class="cart_content">
  <view class="cart_title">购物车</view>
  <view class="cart_main">
    <!-- 当cart数组 长度不为0 显示 商品信息 -->
    <block wx:if="{{cart.length!==0}}">
        <view class="cart_item"
      wx:for="{{cart}}"
      wx:key="goods_id"
      >
          <!-- 复选框 -->
          <view class="cart_chk_wrap">
            <checkbox-group data-id="{{item.goods_id}}" bindchange="handeItemChange">
              <checkbox checked="{{item.checked}}"></checkbox>
            </checkbox-group>
          </view>
          <!-- 商品图片 -->
          <navigator class="cart_img_wrap">
          <image mode="widthFix" src="{{item.goods_small_logo}}" ></image>
          </navigator>
          <!-- 商品信息 -->
          <view class="cart_info_wrap">
            <view class="goods_name">{{item.goods_name}}</view>
            <view class="goods_price_wrap">
              <view class="goods_price">￥{{item.goods_price}}</view>
              <view class="cart_num_tool">
                <view bindtap="handleItemNumEdit" data-id="{{item.goods_id}}" data-operation="{{-1}}"  class="num_edit">-</view>
                <view class="goods_num">{{item.num}}</view>
                <view bindtap="handleItemNumEdit" data-id="{{item.goods_id}}" data-operation="{{1}}"  class="num_edit">+</view>
              </view>
            </view>
          </view>
        </view>
    </block>
    <block wx:else>
      <image mode="widthFix" src="http://hbimg.b0.upaiyun.com/e1b1467beea0a9c7d6a56b32bac6d7e5dcd914f7c3e6-YTwUd6_fw658" ></image>
    </block>
  </view>
</view>

<!-- 底部工具栏 -->
<view class="footer_tool">
  <!-- 全选 -->
  <view class="all_chk_wrap">
    <checkbox-group bindchange="handleItemAllCheck">
      <checkbox checked="{{allChecked}}">全选</checkbox>
    </checkbox-group>
  </view>
  <!-- 总价格 -->
  <view class="total_price_wrap">
    <view class="total_price">
      合计: <text class="total_price_text">￥{{totalPrice}}</text>
    </view>
    <view>包含运费</view>
  </view>
  <!-- 结算 -->
  <view class="order_pay_wrap" bindtap="handlePay" >
    结算({{totalNum}})
  </view>
</view>

page {
  padding-bottom: 90rpx;
}
.revice_address_row .address_btn {
  padding: 20rpx;
}
.revice_address_row .address_btn button {
  width: 60%;
}
.revice_address_row .user_info_row {
  display: flex;
  padding: 20rpx;
}
.revice_address_row .user_info_row .user_info {
  flex: 5;
}
.revice_address_row .user_info_row .user_phone {
  flex: 3;
  text-align: right;
}
.cart_content .cart_title {
  padding: 20rpx;
  font-size: 36rpx;
  color: var(--themeColor);
  border-top: 1rpx solid currentColor;
  border-bottom: 1rpx solid currentColor;
}
.cart_content .cart_main .cart_item {
  display: flex;
  padding: 10rpx;
  border-bottom: 1rpx solid #ccc;
}
.cart_content .cart_main .cart_item .cart_chk_wrap {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
}
.cart_content .cart_main .cart_item .cart_img_wrap {
  flex: 2;
  display: flex;
  justify-content: center;
  align-items: center;
}
.cart_content .cart_main .cart_item .cart_img_wrap image {
  width: 80%;
}
.cart_content .cart_main .cart_item .cart_info_wrap {
  flex: 4;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
}
.cart_content .cart_main .cart_item .cart_info_wrap .goods_name {
  display: -webkit-box;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  color: #666;
}
.cart_content .cart_main .cart_item .cart_info_wrap .goods_price_wrap {
  display: flex;
  justify-content: space-between;
}
.cart_content .cart_main .cart_item .cart_info_wrap .goods_price_wrap .goods_price {
  color: var(--themeColor);
  font-size: 34rpx;
}
.cart_content .cart_main .cart_item .cart_info_wrap .goods_price_wrap .cart_num_tool {
  display: flex;
}
.cart_content .cart_main .cart_item .cart_info_wrap .goods_price_wrap .cart_num_tool .num_edit {
  width: 55rpx;
  height: 55rpx;
  display: flex;
  justify-content: center;
  align-items: center;
  border: 1rpx solid #ccc;
}
.cart_content .cart_main .cart_item .cart_info_wrap .goods_price_wrap .cart_num_tool .goods_num {
  width: 55rpx;
  height: 55rpx;
  display: flex;
  justify-content: center;
  align-items: center;
}
.footer_tool {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 90rpx;
  background-color: #fff;
  display: flex;
  border-top: 1rpx solid #ccc;
}
.footer_tool .all_chk_wrap {
  flex: 2;
  display: flex;
  justify-content: center;
  align-items: center;
}
.footer_tool .total_price_wrap {
  flex: 5;
  padding-right: 15rpx;
  text-align: right;
}
.footer_tool .total_price_wrap .total_price .total_price_text {
  color: var(--themeColor);
  font-size: 34rpx;
  font-weight: 600;
}
.footer_tool .order_pay_wrap {
  flex: 3;
  background-color: var(--themeColor);
  color: #fff;
  font-size: 32rpx;
  font-weight: 600;
  display: flex;
  justify-content: center;
  align-items: center;
}