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:
直接上代码!
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-z0-9\u4e00-\u9fa5][email protected][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>
专门建立的学习 Q-q-u-n 784-783- 零12 分享学习方法和需要注意的小细节, 互相交流学习, 不停更新最新的教程和学习技巧 (从零基础开始到 web 前端项目实战教程, 学习工具, 全栈开发学习路线以及规划)
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;
- }
来源: http://www.bubuko.com/infodetail-3384136.html