分享一个用纯 CSS3 实现的，漂亮的 input 输入框动画样式库-Text input love。

点击每个输入框都用不同的动画效果，始终显示标签label，并显示 placeholder（占位符）文本。

演示地址：https://codepen.io/MichaelArestad/full/ohLIa

HTML 代码：

<div class="row">  <p>Click every input.</p></div><div class="row">  <span>    <input class="basic-slide" id="name" type="text" placeholder="Your best name" /><label for="name">Name</label>  </span>  <span>    <input class="basic-slide" id="email" type="text" placeholder="Your favorite email" /><label for="email">Email</label>  </span>  <span>    <input class="basic-slide" id="phone" type="text" placeholder="You can trust us" /><label for="phone">Phone</label>  </span></div><div class="row">  <span>    <input class="clean-slide" id="age" type="text" placeholder="Go for the high score!" /><label for="age">Age</label>  </span>  <span>    <input class="clean-slide" id="height" type="text" placeholder="Heels count" /><label for="height">Height</label>  </span>  <span>    <input class="clean-slide" id="weight" type="text" placeholder="Go ahead and lie" /><label for="weight">Weight</label>  </span></div><div class="row">  <span>    <input class="gate" id="class" type="text" placeholder="Wizard!" /><label for="class">Class</label>  </span>  <span>    <input class="gate" id="element" type="text" placeholder="Five to choose from" /><label for="element">Element</label>  </span>  <span>    <input class="gate" id="move" type="text" placeholder="Secret book attack!" /><label for="move">Move</label>  </span></div><div class="row">  <span>    <input class="skinny" id="english" type="text" placeholder="Do you speak it?" /><label for="english">English</label>  </span>  <span>    <input class="skinny" id="burger" type="text" placeholder="A Royale with cheese?" /><label for="burger">Burger</label>  </span>  <span>    <input class="skinny" id="wallet" type="text" placeholder="Bad Mother****er" /><label for="wallet">Wallet</label>  </span></div><div class="row">  <span>    <input class="slide-up" id="card" type="text" placeholder="Fund me!" /><label for="card">Credit Card</label>  </span>  <span>    <input class="slide-up" id="expires" type="text" placeholder="Month Day, Year" /><label for="expires">Expires</label>  </span>  <span>    <input class="slide-up" id="security" type="text" placeholder="Public" /><label for="security">Security Code</label>  </span></div><div class="row">  <span>    <input class="card-slide" id="knock" type="text" placeholder="Whos there?" /><label for="knock">Knock knock</label>  </span>  <span>    <input class="card-slide" id="max" type="text" placeholder="Max who?" /><label for="max">Max</label>  </span>  <span>    <input class="card-slide" id="out" type="text" placeholder="Sunuva..." /><label for="out">Maxed out card ;)</label>  </span></div><div class="row">  <span>    <input class="swing" id="artist" type="text" placeholder="BO$$" /><label for="artist">Artist</label>  </span>  <span>    <input class="swing" id="song" type="text" placeholder="I dont give a ****" /><label for="song">Song</label>  </span>  <span>    <input class="swing" id="eyes" type="text" placeholder="Crazy" /><label for="eyes">Eyes</label>  </span></div><div class="row">  <span>    <input class="balloon" id="state" type="text" placeholder="Liquid, solid, gaseous..." /><label for="state">State</label>  </span>  <span>    <input class="balloon" id="planet" type="text" placeholder="Probably Earth" /><label for="planet">Planet</label>  </span>  <span>    <input class="balloon" id="galaxy" type="text" placeholder="Milky Way?" /><label for="galaxy">Galaxy</label>  </span></div>

SCSS 代码：

Sass 代码:

@import "compass/css3"; @import url(https://fonts.googleapis.com/css?family=Open+Sans:400,700,600,300,800); * {  box-sizing: border-box;}html,body {  overflow-x: hidden;  font-family: "Open Sans", sans-serif;  font-weight: 300;  color: #fff;  background: #efefef;}@mixin epic-sides() { // https://codepen.io/MichaelArestad/pen/qltuk    position: relative;    z-index: 1;     &:before {        position: absolute;        content: "";        display: block;        top: 0;        left: -5000px;        height: 100%;        width: 15000px;        z-index: -1;        @content;    }}.row {  max-width: 800px;  margin: 0 auto;  padding: 60px 30px;  background: #032429;  @include epic-sides() {background: inherit;}  text-align: center;    &:first-child {    padding: 40px 30px;  }  &:nth-child(2),  &:nth-child(8),  &:nth-child(10){    background: #134A46;  }  &:nth-child(3),  &:nth-child(7) {    background: #377D6A;  }  &:nth-child(4),  &:nth-child(6) {    background: #7AB893;  }  &:nth-child(5) {    background: #B2E3AF;  }    span {    position: relative;    display: inline-block;    margin: 30px 10px;  }}.basic-slide {  display: inline-block;  width: 215px;  padding: 10px 0 10px 15px;  font-family: "Open Sans", sans;  font-weight: 400;  color: #377D6A;  background: #efefef;  border: 0;  border-radius: 3px;  outline: 0;  text-indent: 70px; // Arbitrary.  transition: all .3s ease-in-out;    &::-webkit-input-placeholder {    color: #efefef;    text-indent: 0;    font-weight: 300;  }   + label {    display: inline-block;    position: absolute;    top: 0;    left: 0;    padding: 10px 15px;    text-shadow: 0 1px 0 rgba(19,74,70,.4);    background: #7AB893;    transition: all .3s ease-in-out;    border-top-left-radius: 3px;    border-bottom-left-radius: 3px;  }}.basic-slide:focus,.basic-slide:active {  color: #377D6A;  text-indent: 0;  background: #fff;  border-top-left-radius: 0;  border-bottom-left-radius: 0;    &::-webkit-input-placeholder {    color: #aaa;  }  + label {    transform: translateX(-100%);  }}.clean-slide {  position: relative;  display: inline-block;  width: 215px;  padding: 10px 0 10px 15px;  font-family: "Open Sans", sans;  font-weight: 400;  color: #377D6A;  background: #efefef;  border: 0;  border-radius: 3px;  outline: 0;  text-indent: 60px; // Arbitrary.  transition: all .3s ease-in-out;    &::-webkit-input-placeholder {    color: #efefef;    text-indent: 0;    font-weight: 300;  }   + label {    display: inline-block;    position: absolute;    transform: translateX(0);    top: 0;    left: 0;    bottom: 0;    padding: 13px 15px;    font-size: 11px;    font-weight: 700;    text-transform: uppercase;    color: #032429;    text-align: left;    text-shadow: 0 1px 0 rgba(255,255,255,.4);    transition: all .3s ease-in-out, color .3s ease-out;    border-top-left-radius: 3px;    border-bottom-left-radius: 3px;    overflow: hidden;        &:after {      content: "";      position: absolute;      top: 0;      right: 100%;      bottom: 0;      width: 100%;      background: #7AB893;      z-index: -1;      transform: translate(0);      transition: all .3s ease-in-out;      border-top-left-radius: 3px;      border-bottom-left-radius: 3px;    }  }}.clean-slide:focus,.clean-slide:active {  color: #377D6A;  text-indent: 0;  background: #fff;  border-top-left-radius: 0;  border-bottom-left-radius: 0;    &::-webkit-input-placeholder {    color: #aaa;  }  + label {    color: #fff;    text-shadow: 0 1px 0 rgba(19,74,70,.4);    transform: translateX(-100%);        &:after {      transform: translate(100%);    }  }}.gate {  display: inline-block;  width: 215px;  padding: 10px 0 10px 15px;  font-family: "Open Sans", sans;  font-weight: 400;  color: #377D6A;  background: #efefef;  border: 0;  border-radius: 3px;  outline: 0;  text-indent: 65px; // Arbitrary.  transition: all .3s ease-in-out;    &::-webkit-input-placeholder {    color: #efefef;    text-indent: 0;    font-weight: 300;  }   + label {    display: inline-block;    position: absolute;    top: 0;    left: 0;    padding: 10px 15px;    text-shadow: 0 1px 0 rgba(19,74,70,.4);    background: #7AB893;    transition: all .4s ease-in-out;    border-top-left-radius: 3px;    border-bottom-left-radius: 3px;    transform-origin: left bottom;    z-index: 99;        &:before,    &:after {      content: "";      position: absolute;      top: 0;      right: 0;      bottom: 0;      left: 0;      border-radius: 3px;      background: #377D6A;      transform-origin: left bottom;      transition: all .4s ease-in-out;      pointer-events: none;      z-index: -1;    }    &:before {      background: rgba(3,36,41,.2);      z-index: -2;      right: 20%;    }  }}span:nth-child(2) .gate {  text-indent: 85px;}span:nth-child(2) .gate:focus,span:nth-child(2) .gate:active{  text-indent: 0;}.gate:focus,.gate:active {  color: #377D6A;  text-indent: 0;  background: #fff;  border-top-right-radius: 3px;  border-bottom-right-radius: 3px;    &::-webkit-input-placeholder {    color: #aaa;  }  + label {    transform: rotate(-66deg);    border-radius: 3px;        &:before {      transform: rotate(10deg);    }  }}.skinny {  display: inline-block;  width: 215px;  padding: 10px 0 10px 15px;  font-family: "Open Sans", sans;  font-weight: 400;  color: #377D6A;  background: #efefef;  border: 0;  border-radius: 3px;  outline: 0;  text-indent: 75px; // Arbitrary.  transition: all .3s ease-in-out;    &::-webkit-input-placeholder {    color: #efefef;    text-indent: 0;    font-weight: 300;  }   + label {    display: inline-block;    position: absolute;    transform: translateX(0);    top: 0;    left: 0;    padding: 10px 15px;    text-shadow: 0 1px 0 rgba(19,74,70,.4);    transition: all .3s ease-in-out;    border-top-left-radius: 3px;    border-bottom-left-radius: 3px;    overflow: hidden;     &:before,    &:after {      content: "";      position: absolute;      right: 0;      left: 0;      z-index: -1;      transition: all .3s ease-in-out;    }    &:before {      // Skinny bit here      top: 5px;      bottom: 5px;      background: #377D6A; // change this to #134A46      border-top-left-radius: 3px;      border-bottom-left-radius: 3px;    }    &:after {      top: 0;      bottom: 0;      background: #377D6A;    }  }}.skinny:focus,.skinny:active {  color: #377D6A;  text-indent: 0;  background: #fff;    &::-webkit-input-placeholder {    color: #aaa;  }  + label {    transform: translateX(-100%);        &:after {      transform: translateX(100%);    }  }}.slide-up {  display: inline-block;  width: 215px;  padding: 10px 0 10px 15px;  font-family: "Open Sans", sans;  font-weight: 400;  color: #377D6A;  background: #efefef;  border: 0;  border-radius: 3px;  outline: 0;  text-indent: 80px; // Arbitrary.  transition: all .3s ease-in-out;    &::-webkit-input-placeholder {    color: #efefef;    text-indent: 0;    font-weight: 300;  }   + label {    display: inline-block;    position: absolute;    transform: translateX(0);    top: 0;    left: 0;    padding: 10px 15px;    text-shadow: 0 1px 0 rgba(19,74,70,.4);    transition: all .3s ease-in-out;    border-top-left-radius: 3px;    border-bottom-left-radius: 3px;    overflow: hidden;     &:before,    &:after {      content: "";      position: absolute;      right: 0;      left: 0;      z-index: -1;      transition: all .3s ease-in-out;    }    &:before {      // Skinny bit here      top: 6px;      left: 5px;      right: 5px;      bottom: 6px;      background: #377D6A; // change this to #134A46    }    &:after {      top: 0;      bottom: 0;      background: #377D6A;    }  }}span:nth-child(1) .slide-up {  text-indent: 105px;}span:nth-child(3) .slide-up {  text-indent: 125px;}span:nth-child(1) .slide-up:focus,span:nth-child(1) .slide-up:active,span:nth-child(3) .slide-up:focus,span:nth-child(3) .slide-up:active {  text-indent: 0;}.slide-up:focus,.slide-up:active {  color: #377D6A;  text-indent: 0;  background: #fff;    &::-webkit-input-placeholder {    color: #aaa;  }  + label {    transform: translateY(-100%);     &:before {      border-radius: 5px;    }    &:after {      transform: translateY(100%);    }  }}.card-slide {  display: inline-block;  width: 215px;  padding: 10px 0 10px 15px;  font-family: "Open Sans", sans;  font-weight: 400;  color: #377D6A;  background: #efefef;  border: 0;  border-radius: 3px;  outline: 0;  text-indent: 115px; // Arbitrary.  transition: all .3s ease-in-out;    &::-webkit-input-placeholder {    color: #efefef;    text-indent: 0;    font-weight: 300;  }   + label {    display: block;    position: absolute;    top: 0;    left: 0;    padding: 10px 15px;    text-shadow: 0 1px 0 rgba(19,74,70,.4);    background: #7AB893;    transition: all .3s ease-in-out;    border-top-left-radius: 3px;    border-bottom-left-radius: 3px;    transform-origin: right center;    transform: perspective(300px) scaleX(1) rotateY(0deg);  }}span:nth-child(2) .card-slide {  text-indent: 55px;}span:nth-child(3) .card-slide {  text-indent: 150px;}span:nth-child(2) .card-slide:focus,span:nth-child(2) .card-slide:active,span:nth-child(3) .card-slide:focus,span:nth-child(3) .card-slide:active {  text-indent: 0;}.card-slide:focus,.card-slide:active {  color: #377D6A;  text-indent: 0;  background: #fff;  border-top-left-radius: 0;  border-bottom-left-radius: 0;    &::-webkit-input-placeholder {    color: #aaa;  }  + label {    transform: perspective(600px) translateX(-100%) rotateY(80deg);  }}.swing {  display: inline-block;  width: 215px;  padding: 10px 0 10px 15px;  font-family: "Open Sans", sans;  font-weight: 400;  color: #377D6A;  background: #efefef;  border: 0;  border-radius: 3px;  outline: 0;  text-indent: 60px; // Arbitrary.  transition: all .3s ease-in-out;    &::-webkit-input-placeholder {    color: #efefef;    text-indent: 0;    font-weight: 300;  }   + label {    display: inline-block;    position: absolute;    top: 0;    left: 0;    padding: 10px 15px;    text-shadow: 0 1px 0 rgba(19,74,70,.4);    background: #7AB893;    border-top-left-radius: 3px;    border-bottom-left-radius: 3px;    transform-origin: 2px 2px;    transform: rotate(0);    // There should be a better way    animation: swing-back .4s 1 ease-in-out;  }}@keyframes swing {  0% {    transform: rotate(0);  }  20% {    transform: rotate(116deg);  }  40% {    transform: rotate(60deg);  }  60% {    transform: rotate(98deg);  }  80% {    transform: rotate(76deg);  }  100% {    transform: rotate(82deg);  }}@keyframes swing-back {  0% {    transform: rotate(82deg);  }  100% {    transform: rotate(0);  }}.swing:focus,.swing:active {  color: #377D6A;  text-indent: 0;  background: #fff;  border-top-left-radius: 0;  border-bottom-left-radius: 0;    &::-webkit-input-placeholder {    color: #aaa;  }  + label {    animation: swing 1.4s 1 ease-in-out;    transform: rotate(82deg);  }}.balloon {  // As suggested by https://twitter.com/dbox/status/365888496486985728  display: inline-block;  width: 215px;  padding: 10px 0 10px 15px;  font-family: "Open Sans", sans;  font-weight: 400;  color: #377D6A;  background: #efefef;  border: 0;  border-radius: 3px;  outline: 0;  text-indent: 60px; // Arbitrary.  transition: all .3s ease-in-out;    &::-webkit-input-placeholder {    color: #efefef;    text-indent: 0;    font-weight: 300;  }   + label {    display: inline-block;    position: absolute;    top: 8px;    left: 0;    bottom: 8px;    padding: 5px 15px;    color: #032429;    font-size: 11px;    font-weight: 700;    text-transform: uppercase;    text-shadow: 0 1px 0 rgba(19,74,70,0);    transition: all .3s ease-in-out;    border-radius: 3px;    background: rgba(122,184,147,0);        &:after {      position: absolute;      content: "";      width: 0;      height: 0;      top: 100%;      left: 50%;      margin-left: -3px;      border-left: 3px solid transparent;      border-right: 3px solid transparent;      border-top: 3px solid rgba(122,184,147,0);      transition: all .3s ease-in-out;    }  }}.balloon:focus,.balloon:active {  color: #377D6A;  text-indent: 0;  background: #fff;    &::-webkit-input-placeholder {    color: #aaa;  }  + label {    color: #fff;    text-shadow: 0 1px 0 rgba(19,74,70,.4);    background: rgba(122,184,147,1);    transform: translateY(-40px);        &:after {      border-top: 4px solid rgba(122,184,147,1);    }  }}

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