Finished product display
case study
- Implement business requirements in a componentized way
- Componentization based on business functions
① Title component (display text)
② List component (list display, product quantity change)
③ Settlement component (calculate the total amount of products)
Implementation steps
first step
- Static layout
- Refactor static data into Vue componentized form (implemented through Vue.component)
- Use local components within global components to separate the three parts (components)
- Implement componentized refactoring
Second step
- Realize dynamic data transfer with data and props
- Realize the calculation function (the third attribute calculated)
- Calculation formula total price = unit price * quantity
- v-for loop and fill the list
- Obtain the id in the child component and pass it to the child component (this.$emit() and listen in the parent component)
- Set the delete button (find the index of the data corresponding to id and use splice to delete the corresponding data)
third step
- Make the quantity displayed on the page
- Get id and value through $event (event.target.value)
- The judgment is to modify the data of that index
- Data addition and subtraction
- Use @click to bind events and disable a tag jump function
- Set a flag for the plus sign and minus sign to distinguish each other (input field change, plus sign change, minus sign change)
To put it in professional terms
- Achieve overall layout and style effects
- Divide independent functional components
- Combine all sub-components to form and overall structure
- Implement each component function one by one
- Title component
- List component
- Settlement component
Basic style
#app {
width: 700px;
height: 800px;
margin: 0 auto;
}
.container .cart {
width: 300px;
margin: auto;
}
.container .title {
background-color: lightblue;
height: 40px;
line-height: 40px;
text-align: center;
/*color: #fff;*/
}
.container .total {
background-color: #FFCE46;
height: 50px;
line-height: 50px;
text-align: right;
}
.container .total button {
margin: 0 10px;
background-color: #DC4C40;
height: 35px;
width: 80px;
border: 0;
}
.container .total span {
color: red;
font-weight: bold;
}
.container .item {
height: 55px;
line-height: 55px;
position: relative;
border-top: 1px solid #ADD8E6;
}
.container .item img {
width: 45px;
height: 45px;
margin: 5px;
}
.container .item .name {
position: absolute;
width: 90px;
top: 0;
left: 55px;
font-size: 16px;
}
.container .item .change {
width: 100px;
position: absolute;
top: 0;
right: 50px;
}
.container .item .change a {
font-size: 20px;
width: 30px;
text-decoration: none;
background-color: lightgray;
vertical-align: middle;
}
.container .item .change .num {
width: 40px;
height: 25px;
}
.container .item .del {
position: absolute;
top: 0;
right: 0px;
width: 40px;
text-align: center;
font-size: 40px;
cursor: pointer;
color: red;
}
.container .item .del:hover {
background-color: orange;
}
The main code to realize the function
<div id="app">
<my-cart></my-cart>
</div>
<script type="text/javascript" src="../js/vue.js"></script>
<script type="text/javascript">
var CarTitle = {
props: ['uname'],
template: `
<div class='title'>{
{uname}}的商品</div>
`
}
var CarList = {
props: ['list'],
template: `
<div>
<div :key='item.id' v-for='item in list' class="item">
<img :src="item.img">
<div class='name' >{
{item.name}}</div>
<div class="change">
<a href="" @click.prevent='sub(item.id)'>—</a>
<input type="text" class="num" :value='item.num' @blur='changeNum(item.id,$event)' />
<a href="" @click.prevent='add(item.id)'>+</a>
</div>
<div class="del" @click='del(item.id)'>x</div>
</div>
</div>
`,
methods: {
changeNum: function (id, event) {
// console.log(id, event.target.value)
// 触发自定义事件
this.$emit('change-num', {
id: id,
num: event.target.value,
type: 'change'
})
},
sub: function (id) {
this.$emit('change-num', {
id: id,
type: 'sub'
})
},
add: function (id) {
this.$emit('change-num', {
id: id,
type: 'add'
})
},
del: function (id) {
// 把id传递给父组件
// console.log(id);
this.$emit('cart-del', id);
}
},
}
var CarTotal = {
props: ['list'],
template: `
<div class="total">
<span>总价:{
{total}}</span>
<button>结算</button>
</div>
`,
// 添加第三属性
computed: {
total: function () {
// 计算商品的总价
var t = 0;
this.list.forEach((item) => {
t += item.price * item.num;
})
return t;
}
}
}
Vue.component('my-cart', {
// 包含三个子属性 （局部属性）
data: function () {
return {
uname: '张三',
list: [
{
id: 1,
name: 'TCL彩电',
price: 1000,
num: 2,
img: 'img/a.jpg'
},
{
id: 2,
name: '机顶盒',
price: 2000,
num: 1,
img: 'img/b.jpg'
},
{
id: 3,
name: '海尔冰箱',
price: 1000,
num: 1,
img: 'img/c.jpg'
},
{
id: 4,
name: '小米手机',
price: 1000,
num: 1,
img: 'img/d.jpg'
},
{
id: 5,
name: '电视机',
price: 1000,
num: 1,
img: 'img/e.jpg'
}
]
}
},
template: `
<div class="container">
<cart-title :uname='uname'></cart-title>
<cart-list :list='list' @change-num='changeNum($event)' @cart-del='delCart($event)'></cart-list>
<cart-total :list='list'></cart-total>
</div>
`,
components: {
'cart-title': CarTitle,
'cart-list': CarList,
'cart-total': CarTotal,
},
methods: {
changeNum: function (val) {
// 分为三种情况 ： 输入域变更，加号变更，减号变更
if (val.type == 'change') {
// 根据子组件传递过来的数据，跟新list中对应的数据
this.list.some(item => {
if (item.id == val.id) {
item.num = val.num;
// // 终止遍历
console.log(item.num)
return true;
}
})
} else if (val.type == 'sub') {
// 减一操作
this.list.some(item => {
if (item.id == val.id) {
item.num = 1;
// // 终止遍历
return true;
}
})
} else if (val.type == 'add') {
// 加一操作
this.list.some(item => {
if (item.id == val.id) {
item.num += 1
// // 终止遍历
return true;
}
})
}
},
delCart: function (id) {
// 根据id删除list中对应的数据
// 1.根据id 所对应数据的索引
var index = this.list.findIndex(item => {
return item.id == id;
});
// 2.根据索引删除对应的数据
this.list.splice(index, 1)
}
}
})
var vm = new Vue({
el: '#app',
data: {
}
})
</script>
Self-motivation
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