haohong 2020-01-17
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!
<!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][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)
.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; }