Vue实现商品分类菜单数量提示功能

如上所示，这篇我们将商品分类菜单显示数量的提示完善，是软件更加易于使用。

好先让我回顾一下上节课的内容，Goods组件，数量提示功能最终需要在Goods组件内显示。

<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>
     <i class=\"num\" v-show=\"calculateCount(item.spus)\">{{calculateCount(item.spus)}}</i>//通过i标签展示数量
    </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>

<script>
import BScroll from \"better-scroll\";
import Shopcart from \"components/Shopcart/Shopcart\";
import Cartcontrol from \"components/Cartcontrol/Cartcontrol\";

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

 },
 created() {
  this.$axios
   .get(\"api/goods\")
   .then(response => {
    let json = response.data;
    if (json.code === 0) {
     // 重点
     this.container = json.data.container_operation_source;
     this.goods = json.data.food_spu_tags;
     console.log(this.goods)
     this.poiInfo = json.data.poi_info;
     this.$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\"
   );
   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) {
   // console.log(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);
  },
  calculateCount(spus) {
    console.log(spus)
   let count = 0;
   spus.forEach(food => {
    if (food.count > 0) {
     count += food.count;
    }
   });

   return count;
  },
 }
};
</script>

注意methods方法中的calculateCount函数实现计算个数，数量来自于增减组件内Cartcontrol。

calculateCount(spus) {
    console.log(spus)
   let count = 0;
   spus.forEach(food => {
    if (food.count > 0) {
     count += food.count;
    }
   });
   return count;
  },

以上是spus数据

Cartcontrol组件控制商品增减

通过组件Cartcontrol接受了来自父组件的传值，并且我们在组件内添加商品的增减功能。

<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--;//this指向了vue实例
    
  },
  increaseCart(){
   if(!this.food.count){
    Vue.set(this.food,\'count\',1);
   }else{
    this.food.count++;
   }
  }
  
 }
};
</script>

完善购物车内的数量统计

<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
  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>

现在商品分类菜单的数量提示就完成了。

以上所述是小编给大家介绍的Vue实现商品分类菜单数量提示功能,希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！
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