UNIAPP实战项目笔记38 购物车的添加商品到购物车功能

亦凉 2024-04-01 18:56 105阅读 0赞

### UNIAPP实战项目笔记38 购物车的加入购物车功能 ###

#### 通过mapGetters实现此功能 ####

> 在 shopcart.vue中  
> 使用mapGetters中的 addShopCart方法实现商品数量的增加

#### 核心代码 detail.vue ####

<template>
            <view class="details">
                
                <swiper :indicator-dots="true" :autoplay="true" :interval="3000" :duration="1000">
                    <swiper-item>
                        <view class="swiper-item">
                            <image class="swiper-img" :src="goodsContent.imgUrl" mode=""></image>
                        </view>
                    </swiper-item>
                </swiper>
                
                <view class="details-goods">
                    <view class="goods-pprice">¥{
        {
        goodsContent.pprice}} </view>
                    <view class="goods-oprice">¥{
        {
        goodsContent.oprice}} </view>
                    <view class="goods-name">{
        {
        goodsContent.name}} </view>
                </view>
                
                <view class="">
                    <view class=""><image class="details-img" src="../../static/img/b3.jpg" mode=""></image></view>
                    <view class=""><image class="details-img" src="../../static/img/b3.jpg" mode=""></image></view>
                    <view class=""><image class="details-img" src="../../static/img/b3.jpg" mode=""></image></view>
                    <view class=""><image class="details-img" src="../../static/img/b3.jpg" mode=""></image></view>
                    <view class=""><image class="details-img" src="../../static/img/b3.jpg" mode=""></image></view>
                    <view class=""><image class="details-img" src="../../static/img/b3.jpg" mode=""></image></view>
                </view>
                
                
                <Card cardTitle="看了又看"></Card>
                <CommodityList :dataList="dataList"></CommodityList>
                
                
                <view class="details-foot">
                    <view class="iconfont icon-xiaoxi"></view>
                    <view class="iconfont icon-31gouwuche" @tap="goShopCart"></view>
                    <view class="add-shopcart" @tap="showPop">加入购物车</view>
                    <view class="purchase" @tap="showPop">立刻购买</view>
                </view>
                
                
                <view class="pop" v-show="isShow" @touchmove.stop="">
                    
                    <view class="pop-mask" @tap="hidePop"> </view>
                    
                    <view class="pop-box" :animation="animationData">
                        <view class="">
                            <image class="pop-img" :src="goodsContent.imgUrl" mode=""></image>
                        </view>
                        <view class="pop-num">
                            <view class="">购买数量</view>
                            <UniNumberBox
                                :min=1 
                                :value="num"
                                @change="changeNumber"
                            ></UniNumberBox>
                        </view>
                        <view class="pop-sub" @tap="addCart">确定</view>
                    </view>
                </view>
            </view>
        </template>
    
        <script>
            import $http from '@/common/api/request.js'
            import Card from '@/components/common/Card.vue';
            import CommodityList from '@/components/common/CommodityList.vue';
            import UniNumberBox from '@/components/uni/uni-number-box/uni-number-box.vue';
            import {
        mapMutations} from 'vuex'
            export default {
        
                data() {
        
                    return {
        
                        isShow:false,
                        goodsContent:{
        },
                        animationData:{
        },
                        num:1,
                        swiperList:[
                            {
        imgUrl:"../../static/img/b3.jpg"},
                            {
        imgUrl:"../../static/img/b3.jpg"},
                            {
        imgUrl:"../../static/img/b3.jpg"}
                        ],
                        dataList:[{
        
                              id:1,
                              imgUrl:"../../static/logo.png",
                              name:"迪奥绒毛大衣,今年必抢,错过瞬时不爽了,爆款疯狂销售",
                              pprice:"299",
                              oprice:"659",
                              discount:"5.2"
                          },
                          {
        
                              id:2,
                              imgUrl:"../../static/logo.png",
                              name:"迪奥绒毛大衣,今年必抢,错过瞬时不爽了,爆款疯狂销售",
                              pprice:"299",
                              oprice:"659",
                              discount:"5.2"
                          },{
        
                              id:3,
                              imgUrl:"../../static/logo.png",
                              name:"迪奥绒毛大衣,今年必抢,错过瞬时不爽了,爆款疯狂销售",
                              pprice:"299",
                              oprice:"659",
                              discount:"5.2"
                          }]
                    };
                },
                components:{
        
                    Card,
                    CommodityList,
                    UniNumberBox
                },
                onLoad(e) {
        
                    // console.log(e.id);
                    // 设置默认id=1
                    if(!e.id)
                        e.id = 1;
                    this.getData(e.id);
                },
                // 修改返回默认行为
                onBackPress(){
        
                    if (this.isShow) {
        
                        this.hidePop();
                        return true;  
                    }
                    
                },
                // 点击分享
                onNavigationBarButtonTap(e) {
        
                    if(e.type==='share'){
        
                        uni.share({
        
                            provider:"weixin",
                            type:0,
                            scene:"WXSceneSession",
                            title:this.goodsContent.name,
                            href:"http://127.0.0.1:8080/#/pages/details/details?id="+this.goodsContent.id,
                            imageUrl:this.goodsContent.imageUrl,
                            success:function(res){
        
                                uni.showTabBar({
        
                                    title:"分享成功"
                                })
                            },
                            fail: (err) => {
        
                                console.log("fail:"+ JSON.stringify(err));
                            }
                        })
                    }
                },
                methods:{
        
                    ...mapMutations(['addShopCart']),
                    // 改变商品数量
                    changeNumber(value){
        
                        this.num = value;
                    },
                    // 请求商品
                    getData(id){
        
                        $http.request({
        
                            url:"/goods/id",
                            data:{
        
                                id:id
                            }
                        }).then((res)=>{
        
                            this.goodsContent = res[0];
                        }).catch(()=>{
        
                            uni.showToast({
        
                                title:'请求失败',
                                icon:'none'
                            })
                        })
                    },
                    showPop(){
        
                        // 初始化一个动画
                        var animation = uni.createAnimation({
        
                            duration:200 // 动画时间
                        });
                        // 定义动画内容
                        animation.translateY(600).step();
                        // 导出动画数据传递给data层
                        this.animationData = animation.export();
                        this.isShow = true;
                        setTimeout(()=>{
        
                            animation.translateY(0).step();
                            this.animationData = animation.export();
                        },200)
                    },
                    hidePop(){
        
                        var animation = uni.createAnimation({
        
                            duration:200
                        });
                        animation.translateY(600).step();
                        this.animationData = animation.export();
                        this.isShow = true;
                        setTimeout(()=>{
        
                            animation.translateY(0).step();
                            this.isShow = false;
                        },200)
                    },
                    // 跳转到购物车页面
                    goShopCart(){
        
                        uni.switchTab({
        
                            url:'../shopcart/shopcart'
                        })
                    },
                    // 加入购物车
                    addCart(){
        
                        let goods = this.goodsContent;
                        this.goodsContent['checked'] = false;
                        this.goodsContent['num'] = this.num;
                        // 加入购物车
                        this.addShopCart(goods);
                        // 隐藏弹出框
                        this.hidePop();
                        // 提示信息
                        uni.showToast({
        
                            title:"成功加入购物车",
                            icon:"none"
                        })
                    },
                }
            }
        </script>
    
        <style lang="scss">
        swiper{
        
            width: 100%;
            height: 700rpx;
        }
        .swiper-img{
        
            width: 100%;
            height: 700rpx;
        }
        .details{
        
            padding-bottom: 90rpx;
        }
        .details-goods{
        
            text-align: center;
            font-weight: bold;
            font-size: 36rpx;
            padding: 10rpx 0;
        }
        .details-img{
        
            width: 100%;
        }
        .details-foot{
        
            position: fixed;
            left: 0;
            bottom: 0;
            width: 100%;
            height: 90rpx;
            display: flex;
            align-items: center;
            justify-content: center;
            background-color: #FFFFFF;
        }
        .details-foot .iconfont{
        
            width: 60rpx;
            height: 60rpx;
            border-radius: 100%;
            background-color: #000000;
            color: #FFFFFF;
            text-align: center;
            margin: 0 10rpx;
            line-height: 60rpx;
        }
        .add-shopcart{
        
            margin: 0 40rpx;
            padding: 6rpx 30rpx;
            background-color: #000000;
            color: #FFFFFF;
            border-radius: 40rpx;
            
        }
        .purchase{
        
            margin: 0 40rpx;
            padding: 6rpx 30rpx;
            background-color: #49BDFB;
            color: #FFFFFF;
            border-radius: 40rpx;
        }
        .pop{
        
            position: fixed;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            z-index: 9999;
        }
        .pop-mask{
        
            position: absolute;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            background-color: rgba(0, 0, 0, 0.3);
        }
        .pop-box{
        
            position: absolute;
            left: 0;
            bottom: 0;
            width: 100%;
            background-color: #FFFFFF;
        }
        .pop-img{
        
            width: 260rpx;
            height: 260rpx;
            top:-130rpx;
            border-radius:20rpx 20rpx 0 0;
            margin: 30rpx;
        }
        .pop-sub{
        
            line-height: 80rpx;
            background-color: #49BDFB;
            color: #FFFFFF;
            text-align: center;
        }
        .pop-num{
        
            padding: 20rpx;
            display: flex;
            justify-content: space-between;
        }
    
        </style>

#### 核心代码 cart.js部分 ####

export default{
        
        state:{
        
            list:[
                    /* {
                        id:1,
                        name:"332经济法能聚聚会技能大赛 经济法能聚聚会技能大赛",
                        color:"颜色：嘿嘿嘿激活",
                        imgUrl:"../../static/logo.png",
                        pprice:"27",
                        num:1,
                        checked:false
                    },{
                        id:2,
                        name:"032经济法能聚聚会技能大赛 经济法能聚聚会技能大赛",
                        color:"颜色：嘿嘿嘿激活",
                        imgUrl:"../../static/logo.png",
                        pprice:"48",
                        num:6,
                        checked:false
                    } */
                ],
            selectedList:[]
            
        },
        getters:{
        
            // 判断是否 全选
            checkedAll(state){
        
                return state.list.length === state.selectedList.length;
            },
            // 合计 结算数量
            totalCount(state){
        
                let total = {
        
                    pprice:0,
                    num:0
                }
                state.list.forEach(v=>{
        
                    // 是否选中
                    if(state.selectedList.indexOf(v.id) > -1){
        
                        // 合计
                        total.pprice += v.pprice*v.num;
                        // 结算数量
                        total.num = state.selectedList.length;
                    }
                })            
                
                return total;
            }
        },
        mutations:{
        
            // 全选
            checkAll(state){
        
                state.selectedList = state.list.map(v=>{
        
                    v.checked = true;
                    return v.id;
                })
            },
            // 全不选
            unCheckAll(state){
        
                state.list.forEach(v=>{
        
                    v.checked = false;
                })
                state.selectedList = [];
            },
            // 单选
            selectedItem(state,index){
        
                let id = state.list[index].id;
                let i = state.selectedList.indexOf(id);
                // 如果selectList已经存在就代表他之前的选中状态,checked=false,并且在selectedList删除
                if (i>-1) {
        
                    state.list[index].checked = false;
                    return state.selectedList.splice(i,1);
                }
                // 如果之前没有选中,checked=true,把当前的id添加到selectedList
                state.list[index].checked = true;
                state.selectedList.push(id);
            },
            // 
            delGoods(state){
        
                state.list = state.list.filter(v=>{
        
                    return state.selectedList.indexOf(v.id) === -1;
                })
            },
            // 加入购物车
            addShopCart(state, goods){
        
                state.list.push(goods);
            }
        },
        actions:{
        
            checkedAllFn({
         commit,getters}){
        
                getters.checkedAll ? commit("unCheckAll") : commit("checkAll")
            },
            delGoodsFn({
         commit}){
        
                commit('delGoods');
                commit("unCheckAll");
                uni.showToast({
        
                    title:'删除成功',
                    icon:"none"
                })
            }
        }
    }

#### 实际案例图片 购物车的添加商品功能 ####

![加入购物车实例图片][041d821e15914887b772cdf92ce0d355.png]

#### 目录结构 ####

##### 前端目录结构 #####

*  manifest.json 配置文件： appid、logo…
 *  pages.json 配置文件： 导航、 tabbar、 路由
 *  main.js vue初始化入口文件
 *  App.vue 全局配置：样式、全局监视
 *  static 静态资源：图片、字体图标
 *  page 页面
    
     *  index
        
         *  index.vue
     *  list
        
         *  list.vue
     *  my
        
         *  my.vue
     *  search
        
         *  search.vue
     *  search-list
        
         *  search-list.vue
     *  shopcart
        
         *  shopcart.vue
     *  details
        
         *  details.vue
 *  components 组件
    
     *  index
        
         *  Banner.vue
         *  Hot.vue
         *  Icons.vue
         *  indexSwiper.vue
         *  Recommend.vue
         *  Shop.vue
     *  common
        
         *  Card.vue
         *  Commondity.vue
         *  CommondityList.vue
         *  Line.vue
         *  ShopList.vue
     *  uni
        
         *  uni-number-box
            
             *  uni-number-box.vue
         *  uni-icons
            
             *  uni-icons.vue
         *  uni-nav-bar
            
             *  uni-nav-bar.vue
 *  common 公共文件：全局css文件 || 全局js文件
    
     *  api
        
         *  request.js
     *  common.css
     *  uni.css
 *  store vuex状态机文件
    
     *  modules
        
         *  cart.js
     *  index.js

[041d821e15914887b772cdf92ce0d355.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/01/8cf09d37533e4d648afda2cdf1102c67.png