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@edwardlorilla
Created June 2, 2021 16:35
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【VUEJS】simple shopping cart
<div id="app" v-cloak>
<div v-if="books.length">
<table>
<thead>
<tr>
<th></th>
<th>Book name</th>
<th>Publication date</th>
<th>Price</th>
<th>Purchase quantity</th>
<th>Delete</th>
</tr>
</thead>
<tbody>
<tr v-for="(item,index) in books">
<th>{{item.id}}</th>
<th>{{item.name}}</th>
<th>{{item.date}}</th>
<!--Scheme 1 Keep the decimal point and currency symbol-->
<!-- <th>{{"$"+item.price.toFixed(2)}}</th> -->
<!--Scheme Two-->
<!-- <th>{{getFinalPrice(item.price)}}</th> -->
<!--Plan Three-->
<th>{{item.price | showPrice}}</th>
<th>
<button @click="decrement(index)" :disabled="item.count<=0">-</button>
{{item.count}}
<button @click="increment(index)">+</button>
</th>
<th><button @click="removeHandle(index)">Remove</button></th>
</tr>
</tbody>
</table>
<h2>Total price: {{totalPrice | showPrice}}</h2>
</div>
<h2 v-else>
Shopping cart is empty
</h2>
</div>
const app = new Vue({
el:"#app",
data:{
books:[
{
id:1,
name:"Introduction to Algorithms",
date:'2006-9',
price: 85.00,
count:1
},
{
id:2,
name:"UNIX Programming Art",
date:'2006-2',
price: 50.00,
count:1
},
{
id:3,
name:"Programming Art",
date:'2008-10',
price:39.00,
count:1
},
{
id:4,
name:"Code Encyclopedia",
date:'2006-3',
price:128.00,
count:1
},
]
},
methods: {
//Here we abandon the use of methods to find the total price, and instead use calculated attributes because it is more efficient.
// getFinalPrice(price){
// return "¥"+price.toFixed(2)
// },
increment(index){
this.books[index].count++
},
decrement(index){
this.books[index].count--
},
removeHandle(index){
this.books.splice(index,1);
}
},
computed: {
totalPrice(){
// Option 1: Ordinary for loop
// let totalPrice = 0;
// for(let i=0;i<this.books.length;i++){
// totalPrice += this.books[i].price * this.books[i].count
//}
// return totalPrice
// Option 2: for in
// let totalPrice = 0;
// for(let i in this.books){
// // console.log(i);//1 2 3 4
// totalPrice += this.books[i].price * this.books[i].count
//}
// return totalPrice
// Option 3: for of
// let totalPrice = 0;
// for(let item of this.books){
// // console.log(item);//What you get here is each object in the array
// totalPrice += item.price * item.count
//}
// return totalPrice
// Option 4: reduce
return this.books.reduce(function (preValue, book) {
// console.log(book);//output four objects separately
return preValue + book.price * book.count
}, 0)
}
},
// filter
filters:{
showPrice(price){
return "$"+price.toFixed(2)
}
}
})
<script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.6.11/vue.min.js"></script>
table{
border: 1px solid #e9e9e9;
border-collapse: collapse;
border-spacing: 0;
}
th,td{
padding: 8px 16px;
border: 1px solid #e9e9e9;
text-align: center;
}
th{
background-color: #f7f7f7;
color: #5c6b77;
font-weight: 600;
}
[v-cloak]{
display: none;
}
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