问题
1.想要蓝色框中的checkbox都是选中状态的时候,红色框中显示为true2.已经通过methods实现3.请问用watch如何实现
代码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Vue 测试实例 - 菜鸟教程(runoob.com)</title>
<script src="https://cdn.bootcss.com/vue/2.4.2/vue.min.js"></script>
<style>
* {
padding: 0;
margin: 0;
}
.app-cart {
padding-bottom: 100px;
background-color: #f5f5f5;
}
.app-cart .cart-header {
height: 40px;
line-height: 40px;
text-align: center;
border-bottom: 1px solid #ccc;
}
.cart-main .main-item {
margin-bottom: 10px;
background-color: #fff;
box-sizing: border-box;
border-top: 1px solid #ccc;
border-bottom: 1px solid #ccc;
}
.cart-main .main-item .item-top {
display: flex;
align-items: center;
height: 40px;
box-sizing: border-box;
border-bottom: 1px solid #ccc;
}
.cart-main .main-item .item-top input {
flex: 0 0 50px;
width: 50px;
}
.cart-main .main-item .item-top span {
flex: 1;
}
.cart-main .main-item .item-middle .middle-list {
display: flex;
box-sizing: border-box;
border-bottom: 1px solid #ccc;
}
.cart-main .main-item .item-middle .middle-list .list-left {
flex: 0 0 50px;
width: 50px;
text-align: center;
}
.cart-main .main-item .item-middle .middle-list .list-center {
flex: 0 0 100px;
width: 100px;
}
.cart-main .main-item .item-middle .middle-list .list-right {
display: flex;
flex-direction: column;
flex: 1;
}
.cart-main .main-item .item-footer {
display: flex;
align-items: center;
justify-content: space-between;
height: 40px;
border-top: 1px solid #ccc;
}
.cart-footer {
position: fixed;
left: 0;
bottom: 60px;
width: 100%;
height: 50px;
display: flex;
background-color: #fff;
box-sizing: border-box;
border-top: 1px solid #ccc;
}
.cart-footer .footer-left {
flex: 0 0 50px;
width: 50px;
display: flex;
align-items: center;
margin-left: 20px;
}
.cart-footer .footer-center {
flex: 1;
text-align: right;
}
.cart-footer .footer-right {
flex: 0 0 100px;
width: 100px;
background-color: #ff0000;
color: #fff;
}
</style>
</head>
<body>
<div id="app">
<div class="app-cart">
<header class="cart-header">购物车</header>
<main class="cart-main">
<div v-for="item1 in cartData" :key="item1.id" class="main-item">
<div class="item-top">
<input type="checkbox" v-model="item1.checked" @change="selectItem1(item1)">
<span>{{item1.shop_name}}</span>
</div>
<div class="item-middle">
<div v-for="(item2,index2) in item1.goodsList" :key="item2.id" class="middle-list">
<div class="list-left">
<input type="checkbox" @change="selectItem2(item1)" v-model="item2.checked">
</div>
<div class="list-center">
<!-- <img v-lazy="IMAGESURL + item2.goods_img"> -->
</div>
<div class="list-right">
<p>{{item2.goods_name}}</p>
<div>
<span>单价:{{item2.goods_price}}</span>
<span>数量:{{item2.cart_goods_number}}</span>
</div>
<p>总价:{{item2.goods_price*item2.cart_goods_number}}</p>
</div>
</div>
</div>
</div>
</main>
<footer class="cart-footer">
<div class="footer-left">
<input type="checkbox" v-model="checkAll" @change="selectAll">
<p>全选</p>
</div>
<div class="footer-center">
合计:{{allPrice}}
</div>
<div class="footer-right">
结算
</div>
</footer>
<div>watch:{{bb}}</div>
</div>
</div>
<script>
new Vue({
el: '#app',
data() {
return {
bb: "",
cartData: [{
shop_id: 4,
shop_name: "honor之家",
checked: false,
goodsList: [{
cart_goods_number: 3,
goods_name: "honor7x",
goods_img: "honor7x.png",
goods_price: 1299,
goods_id: 3,
checked: false
}, {
cart_goods_number: 2,
goods_name: "honor6x",
goods_img: "honor6x.png",
goods_price: 1199,
goods_id: 4,
checked: false
}, {
cart_goods_number: 5,
goods_name: "honor5x",
goods_img: "honor5x.png",
goods_price: 1099,
goods_id: 5,
checked: false
}]
}, {
shop_id: 1,
shop_name: "iPhone之家",
checked: false,
goodsList: [{
cart_goods_number: 1,
goods_name: "iPhonex",
goods_img: "iPhonex.png",
goods_price: 8888,
goods_id: 1,
checked: false
}]
}],
allPrice: 0,
checkAll: false
};
},
methods: {
// 全选
selectAll() {
this.cartData.forEach(item => {
item.checked = this.checkAll;
item.goodsList.forEach(item => {
item.checked = this.checkAll;
});
});
if (this.checkAll == false) {
this.allPrice = 0;
}
},
// 第一层选择
selectItem1(item1) {
item1.goodsList.forEach(i => {
i.checked = item1.checked;
});
},
// 第二层选择
selectItem2(item1) {
let item1Price = 0;
let lengths = item1.goodsList.length;
let checkeds = item1.goodsList.filter(i => {
return i.checked == true;
});
if (lengths == checkeds.length) {
item1.checked = true;
} else {
item1.checked = false;
}
checkeds.forEach(item => {
this.allPrice += item.goods_price * item.cart_goods_number;
});
//通过事件来监听，如果全部选中为true,否则为false
this.bb = this.cartData.every(item1 => {
return item1.goodsList.every(item2 => {
return item2.checked == true;
})
})
},
},
watch: {
bb: function() {
this.bb = this.cartData.every(item1 => {
return item1.goodsList.every(item2 => {
return item2.checked == true;
})
})
}
}
})
</script>
</body>
</html>
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