Vue实现购物车场景下的应用

时间：2020-11-27 来源：智榕旅游

本文实例为大家分享了Vue在购物车场景下的应用，供大家参考，具体内容如下

购物车场景需求：

1. 商品、店铺、购物车的选择

2. 商品删除

关键代码

测试数据

var _list = [{
 checked: false,
 goods: [{
 name: "商品1",
 price: 23,
 checked: false
 }]
}, {
 checked: false,
 goods: [{
 name: "商品2",
 price: 20,
 checked: false
 }, {
 name: "商品3",
 price: 30,
 checked: false
 }]
}];

店铺对象组成购物车数组 _list
商品对象组成店铺对象下的商品数组 goods
每个商品和店铺都有自己的 checked 字段

一. 选择商品

选择商品

选择店铺下的所有商品

选择购物车里的所有商品

数据绑定

<body class="app">
 <input type="checkbox" v-if="list.length" v-model="checkedAll">
 <div v-for="(shopI, shop) in list" class="shop">
 <input type="checkbox" v-model="shop.checked">
 <div v-for="(goodI, good) in shop.goods" class="good">
 <input type="checkbox" v-model="good.checked">
 <span v-html="good.name"></span>
 <span v-html="good.age"></span>
 </div>
 </div>
</body>

var vue = new Vue({
 el: '.app',
 data: {
 list: _list
 }
});

监听购物车全选

computed: {
 checkedAll: function() {
 return this.checkedShopsCount == this.list.length;
 },
 checkedShopsCount: function() {
 var i = 0;
 this.list.forEach(function(item) {
 if (item.checked == true) i++;
 });
 return i;
 }
}

当店铺选择数（checkedShopsCount）等于店铺数（list.length）时，购物车全选（checkedAll）为 true
商品 & 店铺选择事件

<input type="checkbox" v-if="list.length" v-model="checkedAll" @change="setAllChecked($event)">
<div v-for="(shopI, shop) in list">
 <input type="checkbox" v-model="shop.checked" @change="setGoodChecked(shop)">
 <div v-for="(goodI, good) in shop.goods">
 <input type="checkbox" v-model="good.checked" @change="setShopChecked(good, shop)">
 <span v-html="good.name"></span>
 <span v-html="good.age"></span>
 </div>
</div>

methods: {
 setAllChecked: function(e) {
 this.list.forEach(function(shop) {
 shop.checked = e.target.checked;
 shop.goods.forEach(function(good) {
 good.checked = e.target.checked;
 });
 });
 },
 setGoodChecked: function(shop) {
 shop.goods.forEach(function(good) {
 good.checked = shop.checked;
 });
 },
 setShopChecked: function(good, shop) {
 if (!good.checked) {
 shop.checked = false;
 } else {
 // 检查店铺是否存在 checked 为 false 的商品
 shop.checked = !shop.goods.find(function(good) {
 return !good.checked;
 });
 }
 }
}

选择购物车时执行 setAllChecked，此时选择所有商品和店铺
选择店铺时执行 setGoodChecked，此时选择该店铺下所有商品
选择商品时执行 setShopChecked
当商品 checked 为 false 时，取消选择当前店铺
当商品 checked 为 true 时，判断当前店铺是否选择了所有商品，是则选择当前店铺，否则取消选择当前店铺

二、删除商品

<input type="button" value="删除" @click="deleteGood(shop,goodI,list,shopI)">

methods: {
 deleteGood: function(shop,goodI,list,shopI) {
 shop.goods.splice(goodI, 1);
 if (shop.goods.length==0) {
 list.splice(shopI, 1);
 }
 }
}

全部代码

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>我的购物车</title>
<script src="vue.min.js"></script>
</head>
<body class="app">
<input type="checkbox" v-if="list.length" v-model="checkedAll" @change="setAllChecked($event)">
<div v-for="(shopI, shop) in list">
<input type="checkbox" v-model="shop.checked" @change="setGoodChecked(shop)">
<div v-for="(goodI, good) in shop.goods">
<input type="checkbox" v-model="good.checked" @change="setShopChecked(good, shop)">
<span v-html="good.name"></span>
<span v-html="good.age"></span>
<input type="button" value="删除" @click="deleteGood(shop,goodI,list,shopI)">
</div>
</div>
</body>
<script>
var _list = [{
checked: false,
goods: [{
name: "商品1",
money: 23,
checked: false
}]
}, {
checked: false,
goods: [{
name: "商品2",
money: 20,
checked: false
}, {
name: "商品3",
money: 30,
checked: false
}]
}];
var vue = new Vue({
el: '.app',
data: {
list: _list
},
computed: {
checkedAll: function() {
return this.checkedShopsCount == this.list.length;
},
checkedShopsCount: function() {
var i = 0;
this.list.forEach(function(item) {
if (item.checked == true) i++;
});
return i;
}
},
methods: {
setGoodChecked: function(shop) {
shop.goods.forEach(function(good) {
good.checked = shop.checked;
});
},
setShopChecked: function(good, shop) {
if (!good.checked) {
shop.checked = false;
} else {
shop.checked = !shop.goods.find(function(good) {
return !good.checked;
});
}
},
setAllChecked: function(e) {
this.list.forEach(function(shop) {
shop.checked = e.target.checked;
shop.goods.forEach(function(good) {
good.checked = e.target.checked;
});
});
},
deleteGood: function(shop, goodI, list, shopI) {
shop.goods.splice(goodI, 1);
if (shop.goods.length == 0) {
list.splice(shopI, 1);
}
}
}
});
</script>
</html>