08.智慧商城——购物车布局、全选反选、功能实现

01. 购物车 - 静态布局

在这里插入图片描述

基本结构

<template>
  <div class="cart">
    <van-nav-bar title="购物车" fixed />
    <!-- 购物车开头 -->
    <div class="cart-title">
      <span class="all">共<i>4</i>件商品</span>
      <span class="edit">
        <van-icon name="edit" />
        编辑
      </span>
    </div>

    <!-- 购物车列表 -->
    <div class="cart-list">
      <div class="cart-item" v-for="item in 10" :key="item">
        <van-checkbox></van-checkbox>
        <div class="show">
          <img src="http://cba.itlike.com/public/uploads/10001/20230321/a072ef0eef1648a5c4eae81fad1b7583.jpg" alt="">
        </div>
        <div class="info">
          <span class="tit text-ellipsis-2">新Pad 14英寸 12+128 远峰蓝 M6平板电脑 智能安卓娱乐十核游戏学习二合一 低蓝光护眼超清4K全面三星屏5GWIFI全网通 蓝魔快本平板</span>
          <span class="bottom">
            <div class="price">¥ <span>1247.04</span></div>
            <div class="count-box">
              <button class="minus">-</button>
              <input class="inp" :value="4" type="text" readonly>
              <button class="add">+</button>
            </div>
          </span>
        </div>
      </div>
    </div>

    <div class="footer-fixed">
      <div  class="all-check">
        <van-checkbox  icon-size="18"></van-checkbox>
        全选
      </div>

      <div class="all-total">
        <div class="price">
          <span>合计：</span>
          <span>¥ <i class="totalPrice">99.99</i></span>
        </div>
        <div v-if="true" class="goPay">结算(5)</div>
        <div v-else class="delete">删除</div>
      </div>
    </div>
  </div>
</template>

<script>
export default {
  name: 'CartPage'
}
</script>

<style lang="less" scoped>
// 主题 padding
.cart {
  padding-top: 46px;
  padding-bottom: 100px;
  background-color: #f5f5f5;
  min-height: 100vh;
  .cart-title {
    height: 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 10px;
    font-size: 14px;
    .all {
      i {
        font-style: normal;
        margin: 0 2px;
        color: #fa2209;
        font-size: 16px;
      }
    }
    .edit {
      .van-icon {
        font-size: 18px;
      }
    }
  }

  .cart-item {
    margin: 0 10px 10px 10px;
    padding: 10px;
    display: flex;
    justify-content: space-between;
    background-color: #ffffff;
    border-radius: 5px;

    .show img {
      width: 100px;
      height: 100px;
    }
    .info {
      width: 210px;
      padding: 10px 5px;
      font-size: 14px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;

      .bottom {
        display: flex;
        justify-content: space-between;
        .price {
          display: flex;
          align-items: flex-end;
          color: #fa2209;
          font-size: 12px;
          span {
            font-size: 16px;
          }
        }
        .count-box {
          display: flex;
          width: 110px;
          .add,
          .minus {
            width: 30px;
            height: 30px;
            outline: none;
            border: none;
          }
          .inp {
            width: 40px;
            height: 30px;
            outline: none;
            border: none;
            background-color: #efefef;
            text-align: center;
            margin: 0 5px;
          }
        }
      }
    }
  }
}

.footer-fixed {
  position: fixed;
  left: 0;
  bottom: 50px;
  height: 50px;
  width: 100%;
  border-bottom: 1px solid #ccc;
  background-color: #fff;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 10px;

  .all-check {
    display: flex;
    align-items: center;
    .van-checkbox {
      margin-right: 5px;
    }
  }

  .all-total {
    display: flex;
    line-height: 36px;
    .price {
      font-size: 14px;
      margin-right: 10px;
      .totalPrice {
        color: #fa2209;
        font-size: 18px;
        font-style: normal;
      }
    }

    .goPay, .delete {
      min-width: 100px;
      height: 36px;
      line-height: 36px;
      text-align: center;
      background-color: #fa2f21;
      color: #fff;
      border-radius: 18px;
      &.disabled {
        background-color: #ff9779;
      }
    }
  }

}
</style>

按需导入组件

import { Checkbox } from 'vant'
Vue.use(Checkbox)

02. 购物车 - 构建 vuex 模块 - 获取数据存储

新建 modules/cart.js 模块

export default {
  namespaced: true,
  state () {
    return {
      cartList: []
    }
  },
  mutations: {
  },
  actions: {
  },
  getters: {
  }
}

挂载到 store 上面

import Vue from 'vue'
import Vuex from 'vuex'
import user from './modules/user'
import cart from './modules/cart'

Vue.use(Vuex)

export default new Vuex.Store({
  getters: {
    token: state => state.user.userInfo.token
  },
  modules: {
    user,
    cart
  }
})

封装 API 接口 api/cart.js

// 获取购物车列表数据
export const getCartList = () => {
  return request.get('/cart/list')
}

封装 action 和 mutation

mutations: {
  setCartList (state, newList) {
    state.cartList = newList
  },
},
actions: {
  async getCartAction (context) {
    const { data } = await getCartList()
    data.list.forEach(item => {
      item.isChecked = true
    })
    context.commit('setCartList', data.list)
  }
},

页面中 dispatch 调用

computed: {
  isLogin () {
    return this.$store.getters.token
  }
},
created () {
  if (this.isLogin) {
    this.$store.dispatch('cart/getCartAction')
  }
},

03. 购物车 - mapState - 渲染购物车列表

将数据映射到页面

import { mapState } from 'vuex'

computed: {
  ...mapState('cart', ['cartList'])
}

动态渲染

<!-- 购物车列表 -->
<div class="cart-list">
  <div class="cart-item" v-for="item in cartList" :key="item.goods_id">
    <van-checkbox icon-size="18" :value="item.isChecked"></van-checkbox>
    <div class="show" @click="$router.push(`/prodetail/${item.goods_id}`)">
      <img :src="item.goods.goods_image" alt="">
    </div>
    <div class="info">
      <span class="tit text-ellipsis-2">{{ item.goods.goods_name }}</span>
      <span class="bottom">
        <div class="price">¥ <span>{{ item.goods.goods_price_min }}</span></div>
        <CountBox :value="item.goods_num"></CountBox>
      </span>
    </div>
  </div>
</div>

04. 购物车 - 封装 getters - 动态计算展示

封装 getters：商品总数 / 选中的商品列表 / 选中的商品总数 / 选中的商品总价

getters: {
  cartTotal (state) {
    return state.cartList.reduce((sum, item, index) => sum + item.goods_num, 0)
  },
  selCartList (state) {
    return state.cartList.filter(item => item.isChecked)
  },
  selCount (state, getters) {
    return getters.selCartList.reduce((sum, item, index) => sum + item.goods_num, 0)
  },
  selPrice (state, getters) {
    return getters.selCartList.reduce((sum, item, index) => {
      return sum + item.goods_num * item.goods.goods_price_min
    }, 0).toFixed(2)
  }
}

页面中 mapGetters 映射使用

computed: {
  ...mapGetters('cart', ['cartTotal', 'selCount', 'selPrice']),
},
    
<!-- 购物车开头 -->
<div class="cart-title">
  <span class="all">共<i>{{ cartTotal || 0 }}</i>件商品</span>
  <span class="edit">
    <van-icon name="edit"  />
    编辑
  </span>
</div>


<div class="footer-fixed">
  <div  class="all-check">
    <van-checkbox  icon-size="18"></van-checkbox>
    全选
  </div>
  <div class="all-total">
    <div class="price">
      <span>合计：</span>
      <span>¥ <i class="totalPrice">{{ selPrice }}</i></span>
    </div>
    <div v-if="true" :class="{ disabled: selCount === 0 }" class="goPay">
      结算({{ selCount }})
    </div>
    <div v-else  :class="{ disabled: selCount === 0 }" class="delete">
      删除({{ selCount }})
    </div>
  </div>
</div>

05. 购物车 - 全选反选功能

全选 getters

getters: {
  isAllChecked (state) {
    return state.cartList.every(item => item.isChecked)
  }
}
    
...mapGetters('cart', ['isAllChecked']),

<div class="all-check">
  <van-checkbox :value="isAllChecked" icon-size="18"></van-checkbox>
  全选
</div>

点击小选，修改状态

<van-checkbox @click="toggleCheck(item.goods_id)" ...></van-checkbox>
    
toggleCheck (goodsId) {
  this.$store.commit('cart/toggleCheck', goodsId)
},
    
mutations: {
  toggleCheck (state, goodsId) {
    const goods = state.cartList.find(item => item.goods_id === goodsId)
    goods.isChecked = !goods.isChecked
  },
}

点击全选，重置状态

<div @click="toggleAllCheck" class="all-check">
  <van-checkbox :value="isAllChecked" icon-size="18"></van-checkbox>
  全选
</div>

toggleAllCheck () {
  this.$store.commit('cart/toggleAllCheck', !this.isAllChecked)
},

mutations: {
  toggleAllCheck (state, flag) {
    state.cartList.forEach(item => {
      item.isChecked = flag
    })
  },
}

06. 购物车 - 数字框修改数量

封装 api 接口

// 更新购物车商品数量
export const changeCount = (goodsId, goodsNum, goodsSkuId) => {
  return request.post('/cart/update', {
    goodsId,
    goodsNum,
    goodsSkuId
  })
}

页面中注册点击事件，传递数据

<CountBox :value="item.goods_num" @input="value => changeCount(value, item.goods_id, item.goods_sku_id)"></CountBox>

changeCount (value, goodsId, skuId) {
  this.$store.dispatch('cart/changeCountAction', {
    value,
    goodsId,
    skuId
  })
},

提供 action 发送请求， commit mutation

mutations: {
  changeCount (state, { goodsId, value }) {
    const obj = state.cartList.find(item => item.goods_id === goodsId)
    obj.goods_num = value
  }
},
actions: {
  async changeCountAction (context, obj) {
    const { goodsId, value, skuId } = obj
    context.commit('changeCount', {
      goodsId,
      value
    })
    await changeCount(goodsId, value, skuId)
  },
}

07. 购物车 - 编辑切换状态

data 提供数据, 定义是否在编辑删除的状态

data () {
  return {
    isEdit: false
  }
},

注册点击事件，修改状态

<span class="edit" @click="isEdit = !isEdit">
  <van-icon name="edit"  />
  编辑
</span>

底下按钮根据状态变化

<div v-if="!isEdit" :class="{ disabled: selCount === 0 }" class="goPay">
    去结算（{{ selCount }}）
</div>
<div v-else :class="{ disabled: selCount === 0 }" class="delete">删除</div>

监视编辑状态，动态控制复选框状态

watch: {
  isEdit (value) {
    if (value) {
      this.$store.commit('cart/toggleAllCheck', false)
    } else {
      this.$store.commit('cart/toggleAllCheck', true)
    }
  }
}

08. 购物车 - 删除功能完成

查看接口，封装 API ( 注意：此处 id 为获取回来的购物车数据的 id )

// 删除购物车
export const delSelect = (cartIds) => {
  return request.post('/cart/clear', {
    cartIds
  })
}

注册删除点击事件

<div v-else :class="{ disabled: selCount === 0 }" @click="handleDel" class="delete">
  删除({{ selCount }})
</div>

async handleDel () {
  if (this.selCount === 0) return
  await this.$store.dispatch('cart/delSelect')
  this.isEdit = false
},

提供 actions

actions: {
    // 删除购物车数据
    async delSelect (context) {
      const selCartList = context.getters.selCartList
      const cartIds = selCartList.map(item => item.id)
      await delSelect(cartIds)
      Toast('删除成功')

      // 重新拉取最新的购物车数据 (重新渲染)
      context.dispatch('getCartAction')
    }
},

09. 购物车 - 空购物车处理

外面包个大盒子，添加 v-if 判断

<div class="cart-box" v-if="isLogin && cartList.length > 0">
  <!-- 购物车开头 -->
  <div class="cart-title">
    ...
  </div>
  <!-- 购物车列表 -->
  <div class="cart-list">
    ...
  </div>
  <div class="footer-fixed">
    ...
  </div>
</div>

<div class="empty-cart" v-else>
  <img src="@/assets/empty.png" alt="">
  <div class="tips">
    您的购物车是空的, 快去逛逛吧
  </div>
  <div class="btn" @click="$router.push('/')">去逛逛</div>
</div>

相关样式

.empty-cart {
  padding: 80px 30px;
  img {
    width: 140px;
    height: 92px;
    display: block;
    margin: 0 auto;
  }
  .tips {
    text-align: center;
    color: #666;
    margin: 30px;
  }
  .btn {
    width: 110px;
    height: 32px;
    line-height: 32px;
    text-align: center;
    background-color: #fa2c20;
    border-radius: 16px;
    color: #fff;
    display: block;
    margin: 0 auto;
  }
}