js fuzzy search highlight effect
First look at the renderings
and then the code:
<!DOCTYPE html>
<html lang="en">
<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>auto complete</title>
<style>
bdi {
color: rgb(0, 136, 255);
}
li {
list-style: none;
}
</style>
</head>
<body>
<input class="inp" type="text">
<section>
<ul class="container"></ul>
</section>
</body>
<script>
function debounce(fn, timeout = 300) {
//防抖
let t; //设置一个接收标记,接受定时器返回值
return (...args) => {
//argsfn的插入参 ，即最下面的输入事件参数e,以数组的形式返回
if (t) {
clearTimeout(t);
}
t = setTimeout(() => {
fn.apply(fn, args);//执行(e) => {} 改变指针传入参数e
}, timeout);
}
}
function memorize(fn) {
//缓存
const cache = new Map();//创建一个Map对象进行缓存
return (name) => {
//name为fn插入参 即value 输入值为空，清空container
if (!name) {
container.innerHTML = '';
return;
}
if (cache.get(name)) {
//如果map对象中有输入的valu 直接插入container
container.innerHTML = cache.get(name);
return;
}
const res = fn.call(fn, name).join('');
//以上两种情况都不是的话 fn执行后返回handleInput的Search
//并进行渲染 join方法把数组转成了字符串并清除了","
cache.set(name, res);
console.log(name)
console.log(cache)
console.log(res)
container.innerHTML = res;
}
}
function handleInput(value) {
const reg = new RegExp(value);
//三个标志：全局模式g，不区分大小写模式i，多行模式m 即第二个参数
//这里只匹配第一个结果
const search = data.reduce((res, cur) => {
if (reg.test(cur)) {
res.push(`<li>${
cur.replace(reg, '<bdi>$&</bdi>')}</li>`);
//亮高关键字显示，如果再Vue项目里 结合v-html
}
return res;
}, []);
//第二个参数[] 默认第一开始遍历时res为数组
return search;
}
const data = ["蜡笔小新", "野生动物园", "北京吃货巷子", "上海市中心",
"上海黄埔江", "迪士尼上海", "陆家嘴上海中心", "蜡笔十元一只", "野生哈子",
"北京方便面", "北京烤鸭", "北京博物馆", "北京纪念馆",
"北京儿童吉他培训班", "冬季野生面包屑", "野生骆驼", "野生王八"]
const container = document.querySelector('.container');
const memorizeInput = memorize(handleInput);
document.querySelector('.inp').addEventListener('input', debounce(e => {
memorizeInput(e.target.value);
}))
</script>
</html>