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本文實例為大家分享了Vue在購物車場景下的應用，供大家參考，具體內容如下
購物車場景需求：
1. 商品、店鋪、購物車的選擇
2. 商品刪除
關鍵代碼
測試數據
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
}]
}];
店鋪對象組成購物車數組 _list
商品對象組成店鋪對象下的商品數組 goods
每個商品和店鋪都有自己的 checked 字段
一. 選擇商品
數據綁定
<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
}
});
監聽購物車全選
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;
}
}
當店鋪選擇數（checkedShopsCount）等于店鋪數（list.length）時，購物車全選（checkedAll）為 true
商品 & 店鋪選擇事件
<input type="checkbox" v-if="list.length" v-model="checkedAll" @change="setAllChecked($event)"> <div v-for="(shopI, shop) in list"> <input type="checkbox" v-model="shop.checked" @change="setGoodChecked(shop)"> <div v-for="(goodI, good) in shop.goods"> <input type="checkbox" v-model="good.checked" @change="setShopChecked(good, shop)"> <span v-html="good.name"></span> <span v-html="good.age"></span> </div> </div>
methods: {
setAllChecked: function(e) {
this.list.forEach(function(shop) {
shop.checked = e.target.checked;
shop.goods.forEach(function(good) {
good.checked = e.target.checked;
});
});
},
setGoodChecked: function(shop) {
shop.goods.forEach(function(good) {
good.checked = shop.checked;
});
},
setShopChecked: function(good, shop) {
if (!good.checked) {
shop.checked = false;
} else {
// 檢查店鋪是否存在 checked 為 false 的商品
shop.checked = !shop.goods.find(function(good) {
return !good.checked;
});
}
}
}
選擇購物車時執行 setAllChecked，此時選擇所有商品和店鋪
選擇店鋪時執行 setGoodChecked，此時選擇該店鋪下所有商品
選擇商品時執行 setShopChecked
當商品 checked 為 false 時，取消選擇當前店鋪
當商品 checked 為 true 時，判斷當前店鋪是否選擇了所有商品，是則選擇當前店鋪，否則取消選擇當前店鋪
二、刪除商品
<input type="button" value="刪除" @click="deleteGood(shop,goodI,list,shopI)">
methods: {
deleteGood: function(shop,goodI,list,shopI) {
shop.goods.splice(goodI, 1);
if (shop.goods.length==0) {
list.splice(shopI, 1);
}
}
}
全部代碼
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>我的購物車</title>
<script src="vue.min.js"></script>
</head>
<body class="app">
<input type="checkbox" v-if="list.length" v-model="checkedAll" @change="setAllChecked($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="刪除" @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>
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持億速云。
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