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原生JS实现微信通讯录

蝙蝠侠X3 人气:0

最近工作当中再一次遇到要实现一个车辆列表,要求能够像微信通讯录一样,实现右侧滑动,点击功能,并且滑动过程中,能够有提示。原来用jquery实现过一次,为了精简代码,现在用原生的实现一次。想必工作中大家都能用上,所以就临时谢了一个小案例,分享给大家。本案例重在分享移动端的实现思路,代码和样式可能没有优化,大家见谅。

原本微信通讯录效果:

本案例效果图:

实际工作中可以实现类似于城市列表,产品字母排序这种需求:

代码展示

Dom

Dom结构仅供参考,实际情况看自己需求,比如我现在工作当中使用的React框架,这个静态的dom结构肯定不适用,不过万变不离其宗,原理都是通过id实现的。

<!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">
 <script src="./js/flexible_css.js"></script>
 <script src="./js/flexible.js"></script>
 <link rel="stylesheet" href="css/index.css" rel="external nofollow" >
 <title>原生js仿照微信通讯录</title>
</head>

<body>
<!-- 右侧|字母列表 -->
<ul id="letters">
 <li class="letter-item">A</li>
 <li class="letter-item">B</li>
 <li class="letter-item">C</li>
 <li class="letter-item">D</li>
 <li class="letter-item">E</li>
 ...
</ul>
<!-- 人名单列表 -->
<div class="list-container">
 <dl id="namesList">
 <dt id='a'>A<https://img.qb5200.com/download-x/dt>
 <dd>aaa<https://img.qb5200.com/download-x/dd>
 <dd>aaa<https://img.qb5200.com/download-x/dd>
 ...
 <dt id="b">B<https://img.qb5200.com/download-x/dt>
 <dd>bbb<https://img.qb5200.com/download-x/dd>
 <dd>bbb<https://img.qb5200.com/download-x/dd>
 <dd>bbb<https://img.qb5200.com/download-x/dd>
 ...
 <dt id="c">C<https://img.qb5200.com/download-x/dt>
 <dd>cccc<https://img.qb5200.com/download-x/dd>
 <dd>cccc<https://img.qb5200.com/download-x/dd>
 <dd>cccc<https://img.qb5200.com/download-x/dd>
 <dd>cccc<https://img.qb5200.com/download-x/dd>
 ...
 <dt id="d">D<https://img.qb5200.com/download-x/dt>
 <dd>dddd<https://img.qb5200.com/download-x/dd>
 <dd>dddd<https://img.qb5200.com/download-x/dd>
 <dd>dddd<https://img.qb5200.com/download-x/dd>
 ...
 <https://img.qb5200.com/download-x/dl>
</div>
<!--提示字母框-->
<div class="tip">A</div>
</body>

</html>

css

#letters {
 width: 0.3rem;
 position: fixed; //固定定位很关键,一般右侧都是固定的
 right: 0.2rem;
 top: 50%;
 z-index: 999;
 -webkit-transform: translateY(-50%);
 -moz-transform: translateY(-50%);
 -ms-transform: translateY(-50%);
 -o-transform: translateY(-50%);
 transform: translateY(-50%);
 color: #B2B2B2;
 -webkit-border-radius: 0.1rem;
 -moz-border-radius: 0.1rem;
 border-radius: 0.1rem;
 background-color: #efefef; }
 #letters li {
 background-color: #efefef;
 display: block;
 text-align: center;
 width: 0.4rem;
 height: 0.4rem;
 line-height: 0.4rem;
 font-size: 0.3rem;
 text-align: center; }

.list-container #namesList dt {
 font-size: 0.65rem;
 background-image: linear-gradient(-90deg, #ffffff 0%, #F1F3F6 100%);
 padding-left: 0.2rem; }
.list-container #namesList dd {
 padding-left: 0.2rem;
 line-height: 0.8rem;
 font-size: 0.46rem; }

.tip {
 width: 1rem;
 height: 1rem;
 line-height: 1rem;
 text-align: center;
 position: fixed;
 margin: 0 auto;
 z-index: 999;
 left: 50%;
 top: 50%;
 -webkit-transform: translate(-50%, -50%);
 -moz-transform: translate(-50%, -50%);
 -ms-transform: translate(-50%, -50%);
 -o-transform: translate(-50%, -50%);
 transform: translate(-50%, -50%);
 background-color: rgba(0, 0, 0, 0.38);
 -webkit-border-radius: 0.2rem;
 -moz-border-radius: 0.2rem;
 border-radius: 0.2rem;
 font-size: 0.6rem;
 color: #ffffff;
 display: none; }

JS

这里的点击跳转并没有用a标签的跳转实现,而是使用了 element.scrollIntoView() 的方式实现,这样可以有效的避免点击后url上添加#的尴尬。

<script>
 let tipDom = document.querySelector(".tip")
 // 获取右侧字母DOM
 let letterDom = document.querySelector("#letters")

 // 右侧字母触摸判断逻辑
 letterDom.addEventListener('touchmove', function (e) {
 e.preventDefault()
 //坐标(获取当前触控点的坐标)
 let y = e.touches[0].clientY
 let x = e.touches[0].clientX
 //根据当前纵向坐标控制内容的位置
 let MaxL = letterDom.getBoundingClientRect().left;
 let MaxR = letterDom.getBoundingClientRect().right;
 let MaxT = letterDom.getBoundingClientRect().top
 let MaxB = letterDom.getBoundingClientRect().top + letterDom.getBoundingClientRect().height;
 // 判断是否从一个字母到另一个字母
 if ((x >= MaxL && x <= MaxR) && (y >= MaxT && y <= MaxB) && x && y) {
 let ele = document.elementFromPoint(x, y)
 let eleContent = ele.innerHTML
 clickLetter(eleContent)
 tipDom.innerHTML = eleContent
 tipDom.style.display = 'block'
 letterDom.style.background = "#B2B2B2"
 letterDom.style.color = "#fff"
 }
 letterDom.removeEventListener("touchend", this, false)
 })

 letterDom.addEventListener("touchend", function (e) {
 tipDom.style.display = "none"
 letterDom.style.background = ""
 letterDom.style.color = "#B2B2B2"
 letterDom.removeEventListener("touchmove", this, false)
 })

 let letterDoms = document.querySelectorAll('#letters>.letter-item')

 for (let i = 0; i < letterDoms.length; i++) {
 const letterDom = letterDoms[i];
 let letterTmp = letterDom.innerHTML
 letterDom.addEventListener('click',function () {
 clickLetter(letterTmp)
 })
 }

 // 右侧字母点击事件
 function clickLetter(letter) {
 let tmpLetter = letter.toLowerCase()
 let element = window.document.getElementById(tmpLetter)
 element.scrollIntoView()
 }

</script>

详细源码GitHub地址:WeChatAddressList

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