纯css实现输入框placeholder动效及输入校验

更多精彩内容请关注 https://github.com/abc-club/free-resources

背景

话不多说，我们能否用纯css实现以下效果:

答案是肯定的。

借助css:placeholder-shown :valid :invalid伪类及html5 input pattern 属性就可以实现

:placeholder-shown伪类目前兼容性如下：

:placeholder-shown兼容性

直接上代码！☺️

源码

https://jsbin.com/qenucaz/edit?html,css,output

html:

<!DOCTYPE html><html><head>  <meta charset="utf-8">  <meta name="viewport" content="width=device-width">  <title>JS Bin</title></head><body>  <div class="input-fill-box">    <input class="input-fill" placeholder="邮箱" pattern="^[A-Za-z0-9u4e00-u9fa5]+@[a-zA-Z0-9_-]+(.[a-zA-Z0-9_-]+)+$" required>    <a href="javascript：" class="clear">close</a>    <label class="input-label">邮箱</label></div></body></html>

css:

.input-fill{  width: 100%;  margin: 0;  font-size: 16px;  line-height: 1.5;  outline: none;  padding: 20px 16px 6px;  border: 1px solid transparent;   background: #f5f5fa;  border-radius:10px;  transition: border-color .25s;}.input-fill:placeholder-shown::placeholder {    color: transparent;    }.input-fill-box {  width: 50%;    position: relative;}.input-label {    position: absolute;    left: 16px; top: 14px;    pointer-events: none;    color:#BEC1D9;   padding: 0 2px;    transform-origin: 0 0;    pointer-events: none;    transition: all .25s;}.input-fill:not(:placeholder-shown) ~ .input-label,.input-fill:focus ~ .input-label {    transform: scale(0.75) translate(0px, -14px);    }.input-fill:focus{  border: 2px solid #1d31aa;}.clear{  position:absolute;  top:10px;  right:-20px;   display: none;    transition: all .25s;}.input-fill::-ms-clear { display: none; }.input-fill:not(:placeholder-shown) + .clear { display: inline; }.input-fill:valid { border-color: green; box-shadow: inset 5px 0 0 green;}.input-fill:not(:placeholder-shown):invalid { border-color: red; box-shadow: inset 5px 0 0 red;}

更多精彩内容请关注 https://github.com/abc-club/free-resources

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纯css实现输入框placeholder动效及输入校验