一、需求
鼠标点击上方菜单栏中不同的价格区间,自动筛选出价格符合条件的商品,并渲染在页面中
二、代码素材
以下是缺失JS部分的代码,感兴趣的小伙伴可以先自己试着写一写
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>商品渲染</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
.list {
width: 990px;
margin: 0 auto;
display: flex;
flex-wrap: wrap;
}
.item {
width: 240px;
margin-left: 10px;
padding: 20px 30px;
transition: all .5s;
margin-bottom: 20px;
}
.item:nth-child(4n) {
margin-left: 0;
}
.item:hover {
box-shadow: 0px 0px 5px rgba(0, 0, 0, 0.2);
transform: translate3d(0, -4px, 0);
cursor: pointer;
}
.item img {
width: 100%;
}
.item .name {
font-size: 18px;
margin-bottom: 10px;
color: #666;
}
.item .price {
font-size: 22px;
color: firebrick;
}
.item .price::before {
content: "¥";
font-size: 14px;
}
.filter {
display: flex;
width: 990px;
margin: 0 auto;
padding: 50px 30px;
}
.filter a {
padding: 10px 20px;
background: #f5f5f5;
color: #666;
text-decoration: none;
margin-right: 20px;
}
.filter a:active,
.filter a:focus {
background: #05943c;
color: #fff;
}
</style>
</head>
<body>
<div class="filter">
<a data-index="1" href="javascript:;">0-100元</a>
<a data-index="2" href="javascript:;">100-300元</a>
<a data-index="3" href="javascript:;">300元以上</a>
<a href="javascript:;">全部区间</a>
</div>
<div class="list">
<!-- <div class="item">
<img src="" alt="">
<p class="name"></p>
<p class="price"></p>
</div> -->
</div>
<script>
// .filter a:active 是一个 CSS 选择器,用于选择处于活动状态的 <a> 元素,通常是用户正在点击或按住鼠标按钮时的状态。
// 当用户点击或按住鼠标按钮时,a:active 选择器会应用到 <a> 元素上,从而可以通过 CSS 来改变其样式或进行其他操作。
// 以下是一个示例:
// <style>
// .filter a:active {
// color: red;
// font-weight: bold;
// }
// </style>
// <div class="filter">
// <a href="#">Link 1</a>
// <a href="#">Link 2</a>
// <a href="#">Link 3</a>
// </div>
// 在上述示例中,当用户点击这些链接时,活动状态的链接(<a> 元素)的文本颜色将变为红色,并加粗显示。
// 2. 初始化数据
const goodsList = [
{
id: '4001172',
name: '称心如意手摇咖啡磨豆机咖啡豆研磨机',
price: '289.00',
picture: 'https://yanxuan-item.nosdn.127.net/84a59ff9c58a77032564e61f716846d6.jpg',
},
{
id: '4001594',
name: '日式黑陶功夫茶组双侧把茶具礼盒装',
price: '288.00',
picture: 'https://yanxuan-item.nosdn.127.net/3346b7b92f9563c7a7e24c7ead883f18.jpg',
},
{
id: '4001009',
name: '竹制干泡茶盘正方形沥水茶台品茶盘',
price: '100.00',
picture: 'https://yanxuan-item.nosdn.127.net/2d942d6bc94f1e230763e1a5a3b379e1.png',
},
{
id: '4001874',
name: '古法温酒汝瓷酒具套装白酒杯莲花温酒器',
price: '488.00',
picture: 'https://yanxuan-item.nosdn.127.net/44e51622800e4fceb6bee8e616da85fd.png',
},
{
id: '4001649',
name: '大师监制龙泉青瓷茶叶罐',
price: '139.00',
picture: 'https://yanxuan-item.nosdn.127.net/4356c9fc150753775fe56b465314f1eb.png',
},
{
id: '3997185',
name: '与众不同的口感汝瓷白酒杯套组1壶4杯',
price: '108.00',
picture: 'https://yanxuan-item.nosdn.127.net/8e21c794dfd3a4e8573273ddae50bce2.jpg',
},
{
id: '3997403',
name: '手工吹制更厚实白酒杯壶套装6壶6杯',
price: '99.00',
picture: 'https://yanxuan-item.nosdn.127.net/af2371a65f60bce152a61fc22745ff3f.jpg',
},
{
id: '3998274',
name: '德国百年工艺高端水晶玻璃红酒杯2支装',
price: '139.00',
picture: 'https://yanxuan-item.nosdn.127.net/8896b897b3ec6639bbd1134d66b9715c.jpg',
},
]
</script>
</body>
</html>
三、算法思路
1、封装渲染函数,传入的参数为数组对象,将数组中的每一个对象进行数据处理,再渲染到页面中
2、利用事件委托为上方tab栏注册点击事件,利用事件对象判断鼠标点击的是哪个价格区间,再在数组中筛选出价格在该区间内的商品,并返回一个新的数组对象
3、将新的数组对象作为参数传入渲染函数并调用
四、法一:数组map方法和数组join方法
完整代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>商品渲染</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
.list {
width: 990px;
margin: 0 auto;
display: flex;
flex-wrap: wrap;
}
.item {
width: 240px;
margin-left: 10px;
padding: 20px 30px;
transition: all .5s;
margin-bottom: 20px;
}
.item:nth-child(4n) {
margin-left: 0;
}
.item:hover {
box-shadow: 0px 0px 5px rgba(0, 0, 0, 0.2);
transform: translate3d(0, -4px, 0);
cursor: pointer;
}
.item img {
width: 100%;
}
.item .name {
font-size: 18px;
margin-bottom: 10px;
color: #666;
}
.item .price {
font-size: 22px;
color: firebrick;
}
.item .price::before {
content: "¥";
font-size: 14px;
}
.filter {
display: flex;
width: 990px;
margin: 0 auto;
padding: 50px 30px;
}
.filter a {
padding: 10px 20px;
background: #f5f5f5;
color: #666;
text-decoration: none;
margin-right: 20px;
}
.filter a:active,
.filter a:focus {
background: #05943c;
color: #fff;
}
</style>
</head>
<body>
<div class="filter">
<a data-index="1" href="javascript:;">0-100元</a>
<a data-index="2" href="javascript:;">100-300元</a>
<a data-index="3" href="javascript:;">300元以上</a>
<a href="javascript:;">全部区间</a>
</div>
<div class="list">
<!-- <div class="item">
<img src="" alt="">
<p class="name"></p>
<p class="price"></p>
</div> -->
</div>
<script>
// .filter a:active 是一个 CSS 选择器,用于选择处于活动状态的 <a> 元素,通常是用户正在点击或按住鼠标按钮时的状态。
// 当用户点击或按住鼠标按钮时,a:active 选择器会应用到 <a> 元素上,从而可以通过 CSS 来改变其样式或进行其他操作。
// 以下是一个示例:
// <style>
// .filter a:active {
// color: red;
// font-weight: bold;
// }
// </style>
// <div class="filter">
// <a href="#">Link 1</a>
// <a href="#">Link 2</a>
// <a href="#">Link 3</a>
// </div>
// 在上述示例中,当用户点击这些链接时,活动状态的链接(<a> 元素)的文本颜色将变为红色,并加粗显示。
// 2. 初始化数据
const goodsList = [
{
id: '4001172',
name: '称心如意手摇咖啡磨豆机咖啡豆研磨机',
price: '289.00',
picture: 'https://yanxuan-item.nosdn.127.net/84a59ff9c58a77032564e61f716846d6.jpg',
},
{
id: '4001594',
name: '日式黑陶功夫茶组双侧把茶具礼盒装',
price: '288.00',
picture: 'https://yanxuan-item.nosdn.127.net/3346b7b92f9563c7a7e24c7ead883f18.jpg',
},
{
id: '4001009',
name: '竹制干泡茶盘正方形沥水茶台品茶盘',
price: '100.00',
picture: 'https://yanxuan-item.nosdn.127.net/2d942d6bc94f1e230763e1a5a3b379e1.png',
},
{
id: '4001874',
name: '古法温酒汝瓷酒具套装白酒杯莲花温酒器',
price: '488.00',
picture: 'https://yanxuan-item.nosdn.127.net/44e51622800e4fceb6bee8e616da85fd.png',
},
{
id: '4001649',
name: '大师监制龙泉青瓷茶叶罐',
price: '139.00',
picture: 'https://yanxuan-item.nosdn.127.net/4356c9fc150753775fe56b465314f1eb.png',
},
{
id: '3997185',
name: '与众不同的口感汝瓷白酒杯套组1壶4杯',
price: '108.00',
picture: 'https://yanxuan-item.nosdn.127.net/8e21c794dfd3a4e8573273ddae50bce2.jpg',
},
{
id: '3997403',
name: '手工吹制更厚实白酒杯壶套装6壶6杯',
price: '99.00',
picture: 'https://yanxuan-item.nosdn.127.net/af2371a65f60bce152a61fc22745ff3f.jpg',
},
{
id: '3998274',
name: '德国百年工艺高端水晶玻璃红酒杯2支装',
price: '139.00',
picture: 'https://yanxuan-item.nosdn.127.net/8896b897b3ec6639bbd1134d66b9715c.jpg',
},
]
render(goodsList)
const filter = document.querySelector('.filter')
filter.addEventListener('click', e => {
const { tagName, dataset } = e.target
let arr = goodsList
if (tagName === 'A') {
switch (dataset.index) {
case '1':
arr = arr.filter(item => item.price > 0 && item.price <= 100)
break
case '2':
arr = arr.filter(item => item.price >= 100 && item.price <= 300)
break
case '3':
arr = arr.filter(item => item.price >= 300)
break
}
render(arr)
}
})
function render(arr) {
document.querySelector('.list').innerHTML = arr.map(item => {
const { name, price, picture } = item
return `
<div class="item">
<img src="${picture}" alt="">
<p class="name">${name}</p>
<p class="price">${price}</p>
</div>
`
}).join('')
}
</script>
</body>
</html>
五、法二:数组forEach方法
完整代码
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>商品渲染</title>
<style>
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
.list {
width: 990px;
margin: 0 auto;
display: flex;
flex-wrap: wrap;
}
.item {
width: 240px;
margin-left: 10px;
padding: 20px 30px;
transition: all .5s;
margin-bottom: 20px;
}
.item:nth-child(4n) {
margin-left: 0;
}
.item:hover {
box-shadow: 0px 0px 5px rgba(0, 0, 0, 0.2);
transform: translate3d(0, -4px, 0);
cursor: pointer;
}
.item img {
width: 100%;
}
.item .name {
font-size: 18px;
margin-bottom: 10px;
color: #666;
}
.item .price {
font-size: 22px;
color: firebrick;
}
.item .price::before {
content: "¥";
font-size: 14px;
}
.filter {
display: flex;
width: 990px;
margin: 0 auto;
padding: 50px 30px;
}
.filter a {
padding: 10px 20px;
background: #f5f5f5;
color: #666;
text-decoration: none;
margin-right: 20px;
}
.filter a:active,
.filter a:focus {
background: #05943c;
color: #fff;
}
</style>
</head>
<body>
<div class="filter">
<a data-index="1" href="javascript:;">0-100元</a>
<a data-index="2" href="javascript:;">100-300元</a>
<a data-index="3" href="javascript:;">300元以上</a>
<a href="javascript:;">全部区间</a>
</div>
<div class="list">
<!-- <div class="item">
<img src="" alt="">
<p class="name"></p>
<p class="price"></p>
</div> -->
</div>
<script>
// .filter a:active 是一个 CSS 选择器,用于选择处于活动状态的 <a> 元素,通常是用户正在点击或按住鼠标按钮时的状态。
// 当用户点击或按住鼠标按钮时,a:active 选择器会应用到 <a> 元素上,从而可以通过 CSS 来改变其样式或进行其他操作。
// 以下是一个示例:
// <style>
// .filter a:active {
// color: red;
// font-weight: bold;
// }
// </style>
// <div class="filter">
// <a href="#">Link 1</a>
// <a href="#">Link 2</a>
// <a href="#">Link 3</a>
// </div>
// 在上述示例中,当用户点击这些链接时,活动状态的链接(<a> 元素)的文本颜色将变为红色,并加粗显示。
// 2. 初始化数据
const goodsList = [
{
id: '4001172',
name: '称心如意手摇咖啡磨豆机咖啡豆研磨机',
price: '289.00',
picture: 'https://yanxuan-item.nosdn.127.net/84a59ff9c58a77032564e61f716846d6.jpg',
},
{
id: '4001594',
name: '日式黑陶功夫茶组双侧把茶具礼盒装',
price: '288.00',
picture: 'https://yanxuan-item.nosdn.127.net/3346b7b92f9563c7a7e24c7ead883f18.jpg',
},
{
id: '4001009',
name: '竹制干泡茶盘正方形沥水茶台品茶盘',
price: '100.00',
picture: 'https://yanxuan-item.nosdn.127.net/2d942d6bc94f1e230763e1a5a3b379e1.png',
},
{
id: '4001874',
name: '古法温酒汝瓷酒具套装白酒杯莲花温酒器',
price: '488.00',
picture: 'https://yanxuan-item.nosdn.127.net/44e51622800e4fceb6bee8e616da85fd.png',
},
{
id: '4001649',
name: '大师监制龙泉青瓷茶叶罐',
price: '139.00',
picture: 'https://yanxuan-item.nosdn.127.net/4356c9fc150753775fe56b465314f1eb.png',
},
{
id: '3997185',
name: '与众不同的口感汝瓷白酒杯套组1壶4杯',
price: '108.00',
picture: 'https://yanxuan-item.nosdn.127.net/8e21c794dfd3a4e8573273ddae50bce2.jpg',
},
{
id: '3997403',
name: '手工吹制更厚实白酒杯壶套装6壶6杯',
price: '99.00',
picture: 'https://yanxuan-item.nosdn.127.net/af2371a65f60bce152a61fc22745ff3f.jpg',
},
{
id: '3998274',
name: '德国百年工艺高端水晶玻璃红酒杯2支装',
price: '139.00',
picture: 'https://yanxuan-item.nosdn.127.net/8896b897b3ec6639bbd1134d66b9715c.jpg',
},
]
render(goodsList)
const filter = document.querySelector('.filter')
filter.addEventListener('click', e => {
const { tagName, dataset } = e.target
if (tagName === 'A') {
let arr = goodsList
switch(dataset.index){
case '1':
arr = goodsList.filter(item => item.price > 0 && item.price <= 100)
break
case '2':
arr = goodsList.filter(item => item.price >= 100 && item.price <= 300)
break
case '3':
arr = goodsList.filter(item => item.price >= 300)
break
}
render(arr)
}
})
function render(arr) {
let str = ''
arr.forEach(item => {
const { name, price, picture } = item
str += `
<div class="item">
<img src="${picture}" alt="">
<p class="name">${name}</p>
<p class="price">${price}</p>
</div>
`
})
const list = document.querySelector('.list')
list.innerHTML = str
}
</script>
</body>
</html>