Vue实战—商品控件与购物车联动（9）

本篇我们将构建商品控件与购物车联动。

商品控件

商品控件的结构编写

在商品组件的<template>标签内完成项目结构，以及数据，事件的绑定，与判断逻辑的书写。

<template>
  <div class="goods">
    <div class="menu-wrapper" ref="menuScroll">
      <ul>
        <!--专场-->
        <li class="menu-item" :class="{'current':currentIndex===0}" @click="selectMenu(0)">
          <p class="text">
            <img :src="container.tag_icon" v-if="container.tag_icon" class="icon">
            {{container.tag_name}}
          </p>
        </li>
        <li
          class="menu-item"
          v-for="(item,index) in goods"
          :class="{'current':currentIndex===index+1}"
          @click="selectMenu(index+1)"
        >
          <p class="text">
            <img :src="item.icon" v-if="item.icon" class="icon">
            {{item.name}}
          </p>
        </li>
      </ul>
    </div>
    <!-- 右侧商品列表 -->
    <div class="foods-wrapper" ref="foodScroll">
      <!--专场-->
      <ul>
        <li class="container-list food-list-hook">
          <div v-for="item in container.operation_source_list">
            <img :src="item.pic_url">
          </div>
        </li>
        <!-- 具体分类-->
        <li v-for="item in goods" class="food-list food-list-hook">
          <h3 class="title">{{item.name}}</h3>
          <!--具体商品列表-->
          <ul>
            <li v-for="food in item.spus" class="food-item">
              <div class="icon" :style="head_bg(food.picture)"></div>

              <div class="content">
                <h3 class="name">{{food.name}}</h3>
                <p class="desc" v-if="food.description">{{food.description}}</p>
                <div class="extra">
                  <span class="saled">{{food.month_saled_content}}</span>
                  <span class="praise">{{food.praise_content}}</span>
                </div>
                <img
                  class="product"
                  :src="food.product_label_picture"
                  v-show="food.product_label_picture"
                >
                <p class="price">
                  <span class="text">￥{{food.min_price}}</span>
                  <span class="unit">/{{food.unit}}</span>
                </p>
              </div>
              <div class="cartcontrol-wrapper">
                <Cartcontrol :food="food"></Cartcontrol>
              </div>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <Shopcart :poiInfo="poiInfo" :selectFoods="selectFoods"></Shopcart>
  </div>
</template>

Shopcart组件是Goods组件的子组件，在Shopcart组件初始化的时候我们可以传入给其参数poiInfo selectFoods.

请求数据，声明方法与计算属性

<script>
import BScroll from "better-scroll";//滚动组件
import Shopcart from "components/Shopcart/Shopcart";//购物车
import Cartcontrol from "components/Cartcontrol/Cartcontrol";//控制商品数量按钮

export default {
  data() {
    return {
      container: {},
      goods: [],
      poiInfo: {},
      listHeight: [],
      menuScroll: {},
      foodScroll: {},
      scrollY: 0
    };
  },
  components: {
    BScroll,//引入组件
    Shopcart,
    Cartcontrol

  },
  created() {
    this.$axios
      .get("api/goods")
      .then(response => {
        let json = response.data;
        if (json.code === 0) {
          // 重点
          this.container = json.data.container_operation_source;
          this.goods = json.data.food_spu_tags;
          this.poiInfo = json.data.poi_info;
          this.$nextTick(function() {
            this.initScroll();
            // 左右联动
            // 右->左
            // 计算区间
            this.caculateHeight();
          });
        }
      })
      .catch(function(error) {
        // handle error
        console.log(error);
      });
  },
  computed: {
    // 根据右侧判断左侧index
    currentIndex() {
      for (let i = 0; i < this.listHeight.length; i++) {
        let start = this.listHeight[i];
        let end = this.listHeight[i + 1];
        if (this.scrollY >= start && this.scrollY < end) {
          return i;
        }
      }
      return 0;
    },
    selectFoods() {
      let foods = [];
         this.goods.forEach(good => {
          good.spus.forEach(food => {
            if (food.count > 0) {
              foods.push(food);
            }
          }); 
        });
      return foods;
    }
  },
  methods: {
    head_bg(imgName) {
      return "background-image: url(" + imgName + ");";
    },
    initScroll() {
      this.menuScroll = new BScroll(this.$refs.menuScroll, {
        click: true
      });
      this.foodScroll = new BScroll(this.$refs.foodScroll, {
        probeType: 3,
        click: true
      });
      this.foodScroll.on("scroll", pos => {
        this.scrollY = Math.abs(Math.round(pos.y));
      });
    },
    caculateHeight() {
      let foodList = this.$refs.foodScroll.getElementsByClassName(
        "food-list-hook"
      );//获取到dom元素
      let height = 0;
      this.listHeight.push(height);
      for (let i = 0; i < foodList.length; i++) {
        height += foodList[i].clientHeight;
        this.listHeight.push(height);
      }
      // [0, 215, 1343, 2425, 3483, 4330, 5823, 7237, 8022, 8788, 9443]
    },
    selectMenu(index) {
      let foodlist = this.$refs.foodScroll.getElementsByClassName(
        "food-list-hook"
      );
      // 根据下标，滚动到相对应的元素
      let el = foodlist[index];
      // 滚动到对应元素的位置
      this.foodScroll.scrollToElement(el, 100);
    }
  }
};
</script>

定义商品组件的样式

<style scoped>
.goods {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  position: absolute;
  top: 190px;
  bottom: 51px;
  overflow: hidden;
  width: 100%;
}
.goods .menu-wrapper {
  -webkit-box-flex: 0;
  -ms-flex: 0 0 85px;
  flex: 0 0 85px;
  background: #f4f4f4;
}
.goods .menu-wrapper .menu-item {
  padding: 16px 23px 15px 10px;
  border-bottom: 1px solid #e4e4e4;
  position: relative;
}
.goods .menu-wrapper .menu-item.current {
  background: white;
  font-weight: bold;
  margin-top: -1px;
}
.goods .menu-wrapper .menu-item:first-child.current {
  margin-top: 1px;
}
.goods .menu-wrapper .menu-item .text {
  font-size: 13px;
  color: #333333;
  line-height: 17px;
  vertical-align: middle;
  -webkit-line-clamp: 2;
  display: -webkit-box;
  -webkit-box-orient: vertical;

  overflow: hidden;
}
.goods .menu-wrapper .menu-item .text .icon {
  width: 15px;
  height: 15px;
  vertical-align: middle;
}
.goods .menu-wrapper .menu-item .num {
  position: absolute;
  right: 5px;
  top: 5px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  color: white;
  background: red;
  text-align: center;
  font-size: 7px;
  line-height: 13px;
}

.goods .foods-wrapper {
  -webkit-box-flex: 1;
  -ms-flex: 1;
  flex: 1;
  /* background: blue; */
}
.goods .foods-wrapper .container-list {
  padding: 11px 11px 0 11px;
  border-bottom: 1px solid #e4e4e4;
}
.goods .foods-wrapper .container-list img {
  width: 100%;
  margin-bottom: 11px;
  border-radius: 5px;
}
.goods .foods-wrapper .food-list {
  padding: 11px;
}
.goods .foods-wrapper .food-list .title {
  height: 13px;
  font-size: 13px;
  background: url([e-mail]) no-repeat left center;
  background-size: 2px 10px;
  padding-left: 7px;
  margin-bottom: 12px;
}

.goods .foods-wrapper .food-list .food-item {
  display: flex;
  margin-bottom: 25px;
  position: relative;
}
.goods .foods-wrapper .food-list .food-item .icon {
  flex: 0 0 63px;
  background-position: center;
  background-size: 120% 100%;
  background-repeat: no-repeat;
  margin-right: 11px;
  height: 75px;
}
.goods .foods-wrapper .food-list .food-item .content {
  flex: 1;
}
.goods .foods-wrapper .food-list .food-item .content .name {
  font-size: 16px;
  line-height: 21px;
  color: #333333;
  margin-bottom: 10px;
  padding-right: 27px;
}
.goods .foods-wrapper .food-list .food-item .content .desc {
  font-size: 10px;
  line-height: 19px;
  color: #bfbfbf;
  margin-bottom: 8px;

  /* 超出部分显示省略号*/
  -webkit-line-clamp: 1;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.goods .foods-wrapper .food-list .food-item .content .extra {
  font-size: 10px;
  color: #bfbfbf;
  margin-bottom: 7px;
}
.goods .foods-wrapper .food-list .food-item .content .extra .saled {
  margin-right: 14px;
}
.goods .foods-wrapper .food-list .food-item .content .product {
  height: 15px;
  margin-bottom: 6px;
}
.goods .foods-wrapper .food-list .food-item .content .price {
  font-size: 0;
}
.goods .foods-wrapper .food-list .food-item .content .price .text {
  font-size: 14px;
  color: #fb4e44;
}
.goods .foods-wrapper .food-list .food-item .content .price .unit {
  font-size: 12px;
  color: #bfbfbf;
}
</style>

商品数量控制组件

这里用了vue动画

cart-decrease类为商品数量减少结构。 使用指令v-show控制其显隐。有商品数量的时候会按照规定动画进行显示，反之则隐藏。

cart-count类为选中的商品数量。

cart-add类为商品数量增加结构。

通过vue全局api set进行第一次点击增加商品按钮时候的设置。

https://cn.vuejs.org/v2/api/#...

<template>
  <div class="cartcontrol">
    <transition name="move">
      <div class="cart-decrease" @click="decreaseCart" v-show="food.count">
        <span class="inner icon-remove_circle_outline"></span>
      </div>
    </transition>
    <div class="cart-count" v-show="food.count">{{food.count}}</div>
    <div class="cart-add icon-add_circle" @click="increaseCart">
      <i class="bg"></i>
    </div>
  </div>
</template>

<script>
import Vue from 'vue'
export default {
  props:{
    food:{
      type:Object
    }
  },
  methods:{
    decreaseCart(){
      this.food.count--;
    },
    increaseCart(){
      if(!this.food.count){
        Vue.set(this.food,'count',1);
      }else{
        this.food.count++;
      }
    }
    
  }
};
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
.cartcontrol {
  font-size: 0;
}

.cartcontrol .cart-decrease {
  display: inline-block;
  width: 26px;
  height: 26px;
  font-size: 26px;
  color: #b4b4b4;
}

.cartcontrol .cart-count {
  display: inline-block;
  width: 25px;
  text-align: center;
  font-size: 12px;
  line-height: 26px;
  vertical-align: top;
}

.cartcontrol .cart-add {
  display: inline-block;
  width: 26px;
  height: 26px;
  font-size: 26px;
  color: #ffd161;
  position: relative;
}
.cartcontrol .cart-add .bg {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: black;
  position: absolute;
  left: 3px;
  top: 3px;
  z-index: -1;
}

.move-enter-active,
.move-leave-active {
  transition: all 0.5s linear;
}
.move-enter,
.move-leave-to {
  transform: translateX(20px) rotate(180deg);
}
</style>

购物车组件

我们现在创建shopcart购物车组件。

<template>
  <div class="shopcart" :class="{'highligh':totalCount>0}">
    <div class="shopcart-wrapper">
      <div class="content-left">
        <div class="logo-wrapper" :class="{'highligh':totalCount>0}">
          <span class="icon-shopping_cart logo" :class="{'highligh':totalCount>0}"></span>
          <i class="num" v-show="totalCount">{{totalCount}}</i>
        </div>
        <div class="desc-wrapper">
          <p class="total-price" v-show="totalPrice">￥{{totalPrice}}</p>
          <p class="tip" :class="{'highligh':totalCount>0}">另需{{shipping_fee_tip}}</p>
        </div>
      </div>

      <div class="content-right" :class="{'highligh':totalCount>0}">{{payStr}}</div>
    </div>
  </div>
</template>

<script>
// 导入BScroll
import BScroll from "better-scroll";

export default {
  props: {
    min_price_tip: {
      type: String,
      default: ""
    },
    shipping_fee_tip: {
      type: String,
      default: ""
    },
    selectFoods: {
      type: Array,
      default() {
        return [
          /*  {
            min_price: 10,
            count: 3
          },
          {
            min_price: 7,
            count: 1
          } */
        ];
      }
    }
  },
  computed: {
    // 总个数 将所选商品的个数累加得到总个数。
    totalCount() {
      let num = 0;
      this.selectFoods.forEach(food => {
        num += food.count;
      });

      return num;
    },
    // 总金额
    totalPrice() {
      let total = 0;
      this.selectFoods.forEach(food => {
        total += food.min_price * food.count;
      });

      return total;
    },
    // 结算按钮显示
    payStr() {
      if (this.totalCount > 0) {
        return "去结算";
      } else {
        return this.min_price_tip;
      }
    }
  },
  components: {
    BScroll
  }
};
</script>

<style>
.shopcart-wrapper {
  width: 100%;
  height: 51px;
  background: #514f4f;
  position: fixed;
  left: 0;
  bottom: 0;
  display: flex;
  z-index: 99;
}
.shopcart-wrapper.highligh {
  background: #2d2b2a;
}

.shopcart-wrapper .content-left {
  flex: 1;
}
.shopcart-wrapper .content-left .logo-wrapper {
  width: 50px;
  height: 50px;
  background: #666666;
  border-radius: 50%;
  position: relative;
  top: -14px;
  left: 10px;
  text-align: center;
  float: left;
}
.shopcart-wrapper .content-left .logo-wrapper.highligh {
  background: #ffd161;
}
.shopcart-wrapper .content-left .logo-wrapper .logo {
  font-size: 28px;
  color: #c4c4c4;
  line-height: 50px;
}
.shopcart-wrapper .content-left .logo-wrapper .logo.highligh {
  color: #2d2b2a;
}
.shopcart-wrapper .content-left .logo-wrapper .num {
  width: 15px;
  height: 15px;
  line-height: 15px;
  border-radius: 50%;
  font-size: 9px;
  color: white;
  background: red;
  position: absolute;
  right: 0;
  top: 0;
}
.shopcart-wrapper .content-left .desc-wrapper {
  float: left;
  margin-left: 13px;
}
.shopcart-wrapper .content-left .desc-wrapper .total-price {
  font-size: 18px;
  line-height: 33px;
  color: white;
}
.shopcart-wrapper .content-left .desc-wrapper .tip {
  font-size: 12px;
  color: #bab9b9;
  line-height: 51px;
}
.shopcart-wrapper .content-left .desc-wrapper .tip.highligh {
  line-height: 12px;
}

.shopcart-wrapper .content-right {
  flex: 0 0 110px;
  font-size: 15px;
  color: #bab9b9;
  line-height: 51px;
  text-align: center;
  font-weight: bold;
}
.shopcart-wrapper .content-right.highligh {
  background: #ffd161;
  color: #2d2b2a;
}

.shopcart-wrapper .shopcart-list {
  position: absolute;
  left: 0;
  top: 0;
  z-index: -1;
  width: 100%;
}
.shopcart-wrapper .shopcart-list.show {
  transform: translateY(-100%);
}

.shopcart-wrapper .shopcart-list .list-top {
  height: 30px;
  text-align: center;
  font-size: 11px;
  background: #f3e6c6;
  line-height: 30px;
  color: #646158;
}

.shopcart-wrapper .shopcart-list .list-header {
  height: 30px;
  background: #f4f4f4;
}
.shopcart-wrapper .shopcart-list .list-header .title {
  float: left;
  border-left: 4px solid #53c123;
  padding-left: 6px;
  line-height: 30px;
  font-size: 12px;
}
.shopcart-wrapper .shopcart-list .list-header .empty {
  float: right;
  line-height: 30px;
  margin-right: 10px;
  font-size: 0;
}
.shopcart-wrapper .shopcart-list .list-header .empty img {
  height: 14px;
  margin-right: 9px;
  vertical-align: middle;
}
.shopcart-wrapper .shopcart-list .list-header .empty span {
  font-size: 12px;
  vertical-align: middle;
}

.shopcart-wrapper .shopcart-list .list-content {
  max-height: 360px;
  overflow: hidden;
  background: white;
}
.shopcart-wrapper .shopcart-list .list-content .food-item {
  height: 38px;
  padding: 12px 12px 10px 12px;
  border-bottom: 1px solid #f4f4f4;
}
.shopcart-wrapper .shopcart-list .list-content .food-item .desc-wrapper {
  float: left;
  width: 240px;
}
.shopcart-wrapper
  .shopcart-list
  .list-content
  .food-item
  .desc-wrapper
  .desc-left {
  float: left;
  width: 170px;
}
.shopcart-wrapper
  .shopcart-list
  .list-content
  .food-item
  .desc-wrapper
  .desc-left
  .name {
  font-size: 16px;
  margin-bottom: 8px;

  /* 超出部分隐藏*/
  -webkit-line-clamp: 1;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  overflow: hidden;
  height: 16px;
}
.shopcart-wrapper
  .shopcart-list
  .list-content
  .food-item
  .desc-wrapper
  .desc-left
  .unit {
  font-size: 12px;
  color: #b4b4b4;
}
.shopcart-wrapper
  .shopcart-list
  .list-content
  .food-item
  .desc-wrapper
  .desc-left
  .description {
  font-size: 12px;
  color: #b4b4b4;

  /* 超出部分隐藏*/
  overflow: hidden;
  height: 12px;
}
.shopcart-wrapper
  .shopcart-list
  .list-content
  .food-item
  .desc-wrapper
  .desc-right {
  float: right;
  width: 70px;
  text-align: right;
}
.shopcart-wrapper
  .shopcart-list
  .list-content
  .food-item
  .desc-wrapper
  .desc-right
  .price {
  font-size: 12px;
  line-height: 38px;
}

.shopcart-wrapper .shopcart-list .list-content .food-item .cartcontrol-wrapper {
  float: right;
  margin-top: 6px;
}

.shopcart .shopcart-mask {
  position: fixed;
  top: 0;
  right: 0;
  width: 100%;
  height: 100%;
  z-index: 98px;
  background: rgba(7, 17, 27, 0.6);
}
</style>

到此购物车与组件联动就结束了。下篇我们讲如何进行商品分类菜单数量提示。